It lagging like hell now when i trying to join a server, but i worked just fine a couple of days ago? I have allready tried reinstalling the. wav for transfer Error: server failed to transmit file 'sound/sound/ambience.wav how to fix it?? reinstall VHE? thx. sorry bad english. The FTP server or FTP user exceeded quotas or limits, e.g hard disk quota, in the middle of the backup process. Resolution. Check and adjust the.
youtube videoCS 1.6: 13 Ошибок клиента и как их исправить
Error server failed to transmit file - consider
Totul e ok, serverul porneste fara erori insa cand intru pe server imi da eroare si ma deconecteaza de pe server.
Nu inteleg ce pot sa ii fac, am cl_allowdownload 1 // cl_allowupload 1
In server.cfg am sv_allowdownload 1 // sv_allowupload 1
Am toate fisierele pe server dar nu inteleg de ce nu se descarca
Nici mapele, nici modelele nici .wav nici NIMIC nu se descarca.
**Sunt incepator, explicati-mi mai pe intelesu tuturor va rog**
**Eroare din consola de la joc**
Error: server failed to transmit file 'models/player/z_out_nemesis/z_out_nemesis.mdl'
Error: server failed to transmit file 'maps/fy_snow.res'
Error: server failed to transmit file 'overviews/fy_snow.bmp'
Error: server failed to transmit file 'sound/snow/wind.wav'
Error: server failed to transmit file 'sound/snow/wind2.wav'
Error: server failed to transmit file 'sound/zombie_plague/win_humans1.wav'
Error: server failed to transmit file 'sound/zombie_plague/win_humans2.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_infec1.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_infec2.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_infec3.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_pain1.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombi
Error: server failed to transmit file 'sound/zombie_plague/zombie_pain3.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_pain4.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_pain5.wav'
Error: server failed to transmit file 'sound/zombie_plague/nemesis_pain1.wav'
Error: server failed to transmit file 'sound/zombie_plague/nemesis_pain2.wav'
Error: server failed to transmit file 'sound/zombie_plague/nemesis_pain3.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_die1.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_die2.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_die3.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_die4.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_die5.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_fall1.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_brains1.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_brains2.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_madness1.wav'
Error: server failed to transmit file 'sound/zombie_plague/nemesis1.wav'
Error: server failed to transmit file 'sound/zombie_plague/nemesis2.wav'
Error: server failed to transmit file 'sound/zombie_plague/survivor1.wav'
Error: server failed to transmit file 'sound/zombie_pl
Error: server failed to transmit file 'sound/zombie_plague/grenade_infect.wav'
Error: server failed to transmit file 'sound/zombie_plague/grenade_explode.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_burn3.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_burn4.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_burn5.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_burn6.wav'
Error: server failed to transmit file 'sound/zombie_plague/zombie_burn7.wav'
Error: server failed to transmit file 'sound/warcraft3/frostnova.wav'
Error: server failed to transmit file 'sound/warcraft3/impalehit.wav'
Error: server failed to transmit file 'sound/warcraft3/impalelaunch1.wav'
Error: server failed to transmit file 'sound/zombie_plague/thunder1.wav'
Error: server failed to transmit file 'sound/zombie_plague/thunder2.wav'
Error: server failed to transmit file 'sound/ZombieOutstanding/ambience_normal.wav'
Error: server failed to transmit file 'sound/ZombieOutstanding/ambience_survivor.wav'
Error: server failed to transmit file 'sound/zombie_plague/ambience.wav'
Error: server failed to transmit file 'sound/jetpack.wav'
Error: server failed to transmit file 'sound/jp_blow.wav'
Error: server failed to transmit file 'sound/rocket_fire.wav'
Error: server failed to transmit file 'models/player/z_out_nemesis
Error: server failed to transmit file 'models/player/z_out_survivor/z_out_survivor.mdl'
Error: server failed to transmit file 'models/player/zombie_source/zombie_source.mdl'
Error: server failed to transmit file 'models/player/z_out_admin/z_out_admin.mdl'
Error: server failed to transmit file 'models/player/z_out_assassin/z_out_assassin.mdl'
Error: server failed to transmit file 'models/ZombieOutstanding/z_out_nemesis_claws.mdl'
Error: server failed to transmit file 'models/ZombieOutstanding/z_out_v_grenade_infection.mdl'
Error: server failed to transmit file 'models/zombie_plague/v_grenade_fire.mdl'
Error: server failed to transmit file 'models/zombie_plague/v_grenade_frost.mdl'
Error: server failed to transmit file 'models/zombie_plague/v_grenade_flare.mdl'
Error: server failed to transmit file 'models/zombie_plague/v_knife_zombie.mdl'
Error: server failed to transmit file 'models/ZombieOutstanding/z_out_v_awp_sniper.mdl'
Error: server failed to transmit file 'models/ZombieOutstanding/z_out_assassin_claws.mdl'
Error: server failed to transmit file 'models/player/z_out_clasic/z_out_clasic.mdl'
Error: server failed to transmit file 'models/zombie_plague/z_out_clasic_claws.mdl'
Error: server failed to transmit file 'models/player/z_out_raptor/z_out_raptor.mdl'
Error: server failed to transmit file 'models/zombie_plague/z_out_raptor_claws.mdl'
Error: server failed to transmit file 'models/player/z_out_mutant/z_out_mutant.mdl'
Error: server failed to transmit file 'models/zombie_plague/z_out
Error: server failed to transmit file 'models/player/z_out_tight/z_out_tight.mdl'
Error: server failed to transmit file 'models/zombie_plague/z_out_tight_claws.mdl'
Error: server failed to transmit file 'models/player/z_out_predator_blue/z_out_predator_blue.mdl'
Error: server failed to transmit file 'models/zombie_plague/z_out_predator_blue_claws.mdl'
Error: server failed to transmit file 'models/zombie_plague/v_grenade_infect.mdl'
Error: server failed to transmit file 'models/zombie_plague/v_golden_deagle.mdl'
Error: server failed to transmit file 'models/zombie_plague/p_golden_deagle.mdl'
Error: server failed to transmit file 'models/zombie_plague/v_golden_ak47.mdl'
Error: server failed to transmit file 'models/zombie_plague/p_golden_ak47.mdl'
Error: server failed to transmit file 'models/player/z_out_hunter/z_out_hunter.mdl'
Error: server failed to transmit file 'models/zombie_plague/z_out_hunter_claws.mdl'
Error: could not load file models/player/z_out_nemesis/z_out_nemesis.mdl
Model models/player/z_out_nemesis/z_out_nemesis.mdl not found and not available from server
Cannot continue without model models/player/z_out_nemesis/z_out_nemesis.mdl,
The Authentication Flow
In a nutshell, SFTP (SSH File Transfer Protocol) is a network protocol mostly used for transferring files over the web. It builds on the classic File Transfer Protocol (FTP) and includes Secure Shell (SSH) security components. In the following document we explain how Transmit handles connections to SFTP servers and what you can do to troubleshoot connections if Transmit behaves in a way you didn’t expect.
How does SFTP Authentication work in Transmit 5?
When Transmit attempts to make an SFTP connection it looks in several places for usernames, passwords and/or keys. Here here are those places and the order in which they’re used. Transmit will always attempt the following in order, continuing on to the next option if previous items fail or cannot be found. Here’s a quick list, with more details below.
- Username Preference Order
- Username defined in Transmit’s connection settings
- Username defined in your SSH file
- Shortname of current user on your Mac
- Password & Key Preference Order
- SSH Keys that have been added to the system SSH agent
- SSH Key defined in Transmit’s connection settings
- SSH Key defined in your SSH file
- Passwords defined in Transmit’s connection settings
- Default key files on disk in ~/.ssh
- If no other passwords/keys are found or entered, Transmit will prompt you for credentials when you attempt the connection
Username Preference Order
When authenticating over SFTP Transmit will attempt to find and use usernames in the following order:
- A username entered in Transmit’s connection settings
- A username manually entered and saved in one of Transmit’s server connections, or manually entered via Quick Connect
- A username defined in your SSH config File (Located here: . More Info)
- If your username is defined in your config file, leave the username field empty in Transmit’s connection settings.
- The local user on your Mac
- If no username is defined in your config file or in Transmit’s connection settings, Transmit will send the Shortname of the current user on your Mac by default.
Password & Key Preference Order
Transmit 5 uses passwords and keys in a specific order depending on where they exist on your Mac.
- SSH Keys that have been added to the system SSH agent
- The first authentication method attempted by Transmit are SSH keys that have been added to the system .
- SSH Key defined in Transmit’s connection settings
- If you’re unfamiliar with how to add keys to the system agent, you can add keys directly to Transmit.
To associate an SSH key with a Server, import the key from a file on disk, or generate it right in Transmit.
All key management is handled in the Keys tab of Transmit’s Preferences menu. If you import an encrypted key, you will be prompted for the passphrase and it will be securely stored alongside the key in your system keychain. After your key is imported, edit your Server and select the key you’d like to use for authentication. If your key is encrypted and you chose not to store the passphrase, you will be prompted for it when you connect.
- SSH Key defined in your SSH file
- If the Server does not have a key associated with it in Transmit’s connection settings, Transmit will attempt to use any keys explicitly specified for the server found in your ssh config file.
- Passwords defined in Transmit’s connection settings
- The next authentication method that Transmit will try is a password specified in the Server settings.
- Default key files located in ~/.ssh
- Transmit will attempt to use any keys (id_rsa, id_dsa, id_ed25519, and id_ecdsa) in your ~/.ssh directory. If you have existing keys on disk but do not want Transmit to attempt to use them when connecting, we recommend you specify a key or password with the Server. If these keys are encrypted and the passphrase is not stored in the keychain, Transmit will prompt you for the key’s passphrase when you connect to the server.
To skip authenticating with an encrypted key, leave the passphrase field blank and click Connect.
- Prompt for credentials when connecting
- If you do not want to use an SSH key to connect, and also do not want to store your password in Transmit, Transmit will prompt for the server’s password at the time of connection.
Transmit won’t connect to my server
There are any number of different things that could cause an SFTP connection to fail. If you’re having trouble connecting to your server, here’s what you should check.
1. Make sure your login details are correct
It may sound obvious, but double-check to make sure that you have the correct login details. At the bare minimum, you will need the following information in order to connect to your SFTP server:
- (Typically a domain name such as or an IPv4 address)
- (Typically for SFTP)
- (and/or SSH Key)
Note: Panic is not your web host. We have zero control over your login details. If you need to reset your website password, you will need to contact the hosting company or the person that manages your web server.
If you’re using an SSH key, there are a lot of little details to keep in mind. See our documentation for working with SSH keys for more information.
2. Check the Transcript or error messages
Errors and other connection related information get logged in the Transcript. You can view the Transcript by selecting from the Menu in the menubar. Often times, error messages logged in the transcript will tell you what’s wrong or what setting you need to change. You can find many additional server settings in Preferences > Advanced > Advanced Server Settings.
3. Disable firewalls or other network filtering software
Aggressive settings enabled in firewalls, apps like Little Snitch, or devices like network routers can sometimes cause issues with server connections. This is especially common with corporate or university networks. If you’re having trouble connecting, try disabling any of these apps or devices you may be running. Power cycling your network equipment may also help.
As a test, try connecting your Mac to a different network. If you’re at home, take your Mac to work/school or vice versa. If one network allows you to connect but another network does not, then you’ve found the issue.
4. Try connecting with a different SFTP client app
By connecting with a different SFTP client that’s not Transmit, it can tell you a lot of things. Here are some examples:
- If you cannot connect to your server with Transmit or other SFTP clients, then you know that the connection issue is likely due to your server or your login. Should this be the case, there’s not really anything we can do on our end. You will need to check with your server’s administrator.
- If you CAN connect in other SFTP clients but NOT in Transmit, then it’s either a matter of getting your settings correct, or there’s some quirk with your server that our apps aren’t respecting. Email us with a test login (see our note below) and we can generally determine why this is happening.
Note: For security purposes, do NOT send us the credentials that you yourself use to login! If you send us a login, make sure it’s a newly-created test account. Feel free to lock it down to a single folder if you like.
5. Make sure SFTP is actually enabled on your server
Believe it or not, SSH can be enabled on a given server while having SFTP disabled at the same time. This would allow you to connect via SSH on the command line, but not in an SFTP client app like Transmit. Your server administrator can help you confirm that SFTP is properly enabled.
6. If all else fails, contact us
I’ve you’ve gone through all of the steps above, feel free to reach out to us for technical support. Be sure to include a copy of the Transcript from step 2.
Why can’t I connect to my server after updating to Transmit 5.6.4 or 5.6.5?
If you’re suddenly unable to connect after updating Transmit, you may need to alter your SSH/SFTP configuration. The details of this are explained in the following section.
Starting in Transmit 5.6.4 we’ve made some changes to improve security, address a few bugs, and bring Transmit’s SFTP authentication behavior more in line with how SSH behaves on the command line. As a result, Transmit will now use key files associated with a server before passwords saved in Transmit favorites.
What is a key, you ask? It’s a file you can think of as a “super password” that is unique to your computer and the server. Odds are, you set this up on your computer and have completely forgotten about it, that’s why you’re reading this article. Since keys are more secure than passwords, Transmit now favors using them when logging in to your servers.
Due to these changes, it’s possible you may find yourself in a situation where you are prompted for an SSH key passphrase upon connecting to any SFTP server, like so:
Another possibility is that you may get an error with a miscellaneous error code showing up in the Transcript log.
If you find yourself in this situation, it is likely that you have a key defined for this connection in your SSH config file, whether you meant to or not.
Check your ~/.ssh folder for any errant key files
Open your folder in Finder. Here’s how:
- In Finder’s menubar, select from the menu.
- In the box that appears, enter the following and click Go:
In this folder, look for any key files that start with such as or . If these key files aren’t being used, delete them or rename them. Otherwise, Transmit will offer these default keys before attempting password authentication. If your server isn’t set up to accept these keys, you may run into connection issues.
Check Your SSH Config File For Accuracy
If you’ve checked for any unnecessary keys, the next thing to check would be your SSH config file.
First, open your config file in a text editor of your choosing. Here’s how:
- In Finder’s menubar, select from the menu.
- In the box that appears, enter the following and click Go:
- Right click and open it in a text editor.
Wildcard () configurations in your SSH config are often not ideal as they will offer these keys for every connection. Unless you have the passphrase stored in your keychain, Transmit will prompt for a passphrase in order to use the key for authentication. One common situation would be for Github, as their documentation currently instructs you to configure things this way. Here’s an example of what this would look like in your config file:
The entry above will cause Transmit to prompt you for your SSH Key passphrase with every SFTP connection, as this key is explicitly defined for all addresses due to the wildcard.
Since the config file is used by many different apps (Transmit, Terminal, Coda, Git clients, etc.), this is not an optimal way to define the key in your config file. For the most part, Transmit attempts to match the behavior of SSH on the command line. If you attempt to SSH into the same server on the command line (with a wildcard address in your config file like the example above), you’ll be prompted for the passphrase the same as you would in Transmit.
In an ideal scenario, rather than using a wildcard for the host entry, you would use only the address to which the key actually applies. Using the Github example above as the server in question, that entry in your config file would look like this:
In this case, Transmit would only prompt you for your SSH key passphrase when connecting to .
If you were previously using a wildcard entry deliberately to use your key for multiple addresses, you can add those all to the host entry separated by spaces, avoiding the wildcard scenario and still allowing multiple hosts for a single key entry. Here’s one possible example:
If avoiding a wildcard isn’t an option, you’ll need to manually specify any non-key based connection as requiring password authentication above your wildcard in your config file, like so:
The configuration above allows you to keep the wildcard while requiring the server “mysite.com” to stick to password authentication.
TL;DR: Now that Transmit 5.6.4 (and later) uses explicitly-defined keys in your config file and default keys in your ~/.ssh directory (just like SSH on the command line) make sure that the entry for keys defined in your config file are only for the necessary addresses, not a wildcard.
For more information about how SSH keys work in Transmit or any other Panic app, please see our SSH key documentation.
TransmitFile function (mswsock.h)
- 11 minutes to read
The TransmitFile function transmits file data over a connected socket handle. This function uses the operating system's cache manager to retrieve the file data, and provides high-performance file data transfer over sockets.
Note This function is a Microsoft-specific extension to the Windows Sockets specification.
A handle to a connected socket. The TransmitFile function will transmit the file data over this socket. The socket specified by the hSocket parameter must be a connection-oriented socket of type SOCK_STREAM, SOCK_SEQPACKET, or SOCK_RDM.
A handle to the open file that the TransmitFile function transmits. Since the operating system reads the file data sequentially, you can improve caching performance by opening the handle with FILE_FLAG_SEQUENTIAL_SCAN.
The hFile parameter is optional. If the hFile parameter is NULL, only data in the header and/or the tail buffer is transmitted. Any additional action, such as socket disconnect or reuse, is performed as specified by the dwFlags parameter.
The number of bytes in the file to transmit. The TransmitFile function completes when it has sent the specified number of bytes, or when an error occurs, whichever occurs first.
Set this parameter to zero in order to transmit the entire file.
The size, in bytes, of each block of data sent in each send operation. This parameter is used by Windows' sockets layer to determine the block size for send operations. To select the default send size, set this parameter to zero.
The nNumberOfBytesPerSend parameter is useful for protocols that have limitations on the size of individual send requests.
A pointer to an OVERLAPPED structure. If the socket handle has been opened as overlapped, specify this parameter in order to achieve an overlapped (asynchronous) I/O operation. By default, socket handles are opened as overlapped.
You can use the lpOverlapped parameter to specify a 64-bit offset within the file at which to start the file data transfer by setting the Offset and OffsetHigh member of the OVERLAPPED structure. If lpOverlapped is a NULL pointer, the transmission of data always starts at the current byte offset in the file.
When the lpOverlapped is not NULL, the overlapped I/O might not finish before TransmitFile returns. In that case, the TransmitFile function returns FALSE, and WSAGetLastError returns ERROR_IO_PENDING or WSA_IO_PENDING. This enables the caller to continue processing while the file transmission operation completes. Windows will set the event specified by the hEvent member of the OVERLAPPED structure, or the socket specified by hSocket, to the signaled state upon completion of the data transmission request.
A pointer to a TRANSMIT_FILE_BUFFERS data structure that contains pointers to data to send before and after the file data is sent. This parameter should be set to a NULL pointer if you want to transmit only the file data.
A set of flags used to modify the behavior of the TransmitFile function call. The dwFlags parameter can contain a combination of the following options defined in the Mswsock.h header file:
|Start a transport-level disconnect after all the file data has been queued for transmission.|
| Prepare the socket handle to be reused. This flag is valid only if TF_DISCONNECT is also specified. |
When the TransmitFile request completes, the socket handle can be passed to the function call previously used to establish the connection, such as AcceptEx or ConnectEx. Such reuse is mutually exclusive; for example, if the AcceptEx function was called for the socket, reuse is allowed only for subsequent calls to the AcceptEx function, and not allowed for a subsequent call to ConnectEx.
Note The socket level file transmit is subject to the behavior of the underlying transport. For example, a TCP socket may be subject to the TCP TIME_WAIT state, causing the TransmitFile call to be delayed.
| Directs the Windows Sockets service provider to use the system's default thread to process long TransmitFile requests. The system default thread can be adjusted using the following registry parameter as a REG_DWORD: |
|Directs the Windows Sockets service provider to use system threads to process long TransmitFile requests.|
| Directs the driver to use kernel asynchronous procedure calls (APCs) instead of worker threads to process long TransmitFile requests. Long TransmitFile requests are defined as requests that require more than a single read from the file or a cache; the request therefore depends on the size of the file and the specified length of the send packet. |
Use of TF_USE_KERNEL_APC can deliver significant performance benefits. It is possible (though unlikely), however, that the thread in which context TransmitFile is initiated is being used for heavy computations; this situation may prevent APCs from launching. Note that the Winsock kernel mode driver uses normal kernel APCs, which launch whenever a thread is in a wait state, which differs from user-mode APCs, which launch whenever a thread is in an alertable wait state initiated in user mode).
| Complete the TransmitFile request immediately, without pending. If this flag is specified and TransmitFile succeeds, then the data has been accepted by the system but not necessarily acknowledged by the remote end. Do not use this setting with the TF_DISCONNECT and TF_REUSE_SOCKET flags. |
Note If the file being sent is not in the file system cache, the request pends.
If the TransmitFile function succeeds, the return value is TRUE. Otherwise, the return value is FALSE. To get extended error information, call WSAGetLastError. An error code of WSA_IO_PENDING or ERROR_IO_PENDING indicates that the overlapped operation has been successfully initiated and that completion will be indicated at a later time. Any other error code indicates that the overlapped operation was not successfully initiated and no completion indication will occur. Applications should handle either ERROR_IO_PENDING or WSA_IO_PENDING in this case.
|An established connection was aborted by the software in your host machine. This error is returned if the virtual circuit was terminated due to a time-out or other failure.|
|An existing connection was forcibly closed by the remote host. This error is returned for a stream socket when the virtual circuit was reset by the remote side. The application should close the socket as it is no longer usable.|
|The system detected an invalid pointer address in attempting to use a pointer argument in a call. This error is returned if the lpTransmitBuffers or lpOverlapped parameter is not totally contained in a valid part of the user address space.|
|An invalid argument was supplied. This error is returned if the hSocket parameter specified a socket of type SOCK_DGRAM or SOCK_RAW. This error is returned if the dwFlags parameter has the TF_REUSE_SOCKET flag set, but the TF_DISCONNECT flag was not set. This error is also returned if the offset specified in the OVERLAPPED structure pointed to by the lpOverlapped is not within the file. This error is also returned if the nNumberOfBytesToWrite parameter is set to a value greater than 2,147,483,646, the maximum value for a 32-bit integer minus 1.|
|A socket operation encountered a dead network.This error is returned if the network subsystem has failed.|
|The connection has been broken due to keep-alive activity detecting a failure while the operation was in progress.|
|An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full. This error is also returned if the Windows Sockets provider reports a buffer deadlock.|
|A request to send or receive data was disallowed because the socket is not connected.|
|An operation was attempted on something that is not a socket. This error is returned if the hSocket parameter is not a socket.|
|A request to send or receive data was disallowed because the socket had already been shut down in that direction with a previous shutdown call. This error is returned if the socket has been shut down for sending. It is not possible to call TransmitFile on a socket after the shutdown function has been called on the socket with the how parameter set to SD_SEND or SD_BOTH.|
|Either the application has not called the WSAStartup function, or WSAStartup failed. A successful WSAStartup call must occur before using the TransmitFile function.|
|An overlapped I/O operation is in progress. This value is returned if an overlapped I/O operation was successfully initiated and indicates that completion will be indicated at a later time.|
| The I/O operation has been aborted because of either a thread exit or an application request. This error is returned if the overlapped operation has been canceled due to the closure of the socket, the execution of the "SIO_FLUSH" command in WSAIoctl, or the thread that initiated the overlapped request exited before the operation completed. |
Note All I/O initiated by a given thread is canceled when that thread exits. For overlapped sockets, pending asynchronous operations can fail if the thread is closed before the asynchronous operations complete. For more information, see ExitThread.
The TransmitFile function uses the operating system's cache manager to retrieve the file data, and provide high-performance file data transfer over sockets.
The TransmitFile function only supports connection-oriented sockets of type SOCK_STREAM, SOCK_SEQPACKET, and SOCK_RDM. Sockets of type SOCK_DGRAM and SOCK_RAW are not supported. The TransmitPackets function can be used with sockets of type SOCK_DGRAM.
The maximum number of bytes that can be transmitted using a single call to the TransmitFile function is 2,147,483,646, the maximum value for a 32-bit integer minus 1. The maximum number of bytes to send in a single call includes any data sent before or after the file data pointed to by the lpTransmitBuffers parameter plus the value specified in the nNumberOfBytesToWrite parameter for the length of file data to send. If an application needs to transmit a file larger than 2,147,483,646 bytes, then multiple calls to the TransmitFile function can be used with each call transferring no more than 2,147,483,646 bytes. Setting the nNumberOfBytesToWrite parameter to zero for a file larger than 2,147,483,646 bytes will also fail since in this case the TransmitFile function will use the size of the file as the value for the number of bytes to transmit.
Note The function pointer for the TransmitFile function must be obtained at run time by making a call to the WSAIoctl function with the SIO_GET_EXTENSION_FUNCTION_POINTER opcode specified. The input buffer passed to the WSAIoctl function must contain WSAID_TRANSMITFILE, a globally unique identifier (GUID) whose value identifies the TransmitFile extension function. On success, the output returned by the WSAIoctl function contains a pointer to the TransmitFile function. The WSAID_TRANSMITFILE GUID is defined in the Mswsock.h header file.
NoteTransmitFile is not functional on transports that perform their own buffering. Transports with the TDI_SERVICE_INTERNAL_BUFFERING flag set, such as ADSP, perform their own buffering. Because TransmitFile achieves its performance gains by sending data directly from the file cache. Transports that run out of buffer space on a particular connection are not handled by TransmitFile, and as a result of running out of buffer space on the connection, TransmitFile returns STATUS_DEVICE_NOT_READY.The TransmitFilefunction was primarily added to Winsock for use by high-performance server applications (web and ftp servers, for example).
Workstation and client versions of Windows optimize the TransmitFile function for minimum memory and resource utilization by limiting the number of concurrent TransmitFile operations allowed on the system to a maximum of two. On Windows Vista, Windows XP, Windows 2000 Professional, and Windows NT Workstation 3.51 and later only two outstanding TransmitFile requests are handled simultaneously; the third request will wait until one of the previous requests is completed.
Server versions of Windows optimize the TransmitFile function for high performance. On server versions, there are no default limits placed on the number of concurrent TransmitFile operations allowed on the system. Expect better performance results when using TransmitFile on server versions of Windows. On server versions of Windows, it is possible to set a limit on the maximum number of concurrent TransmitFile operations by creating a registry entry and setting a value for the following REG_DWORD:
If the TransmitFile function is called with TCP socket (protocol of IPPROTO_TCP) with both the TF_DISCONNECT and TF_REUSE_SOCKET flags specified, the call will not complete until the two following conditions are met.
- All pending receive data sent by remote side (received prior to a FIN from the remote side) on the TCP socket has been read.
- The remote side has closed the connection (completed the graceful TCP connection closure).
If the TransmitFile function is called with the lpOverlapped parameter set to NULL, the operation is executed as synchronous I/O. The function will not complete until the file has been sent.
Windows Phone 8: This function is supported for Windows Phone Store apps on Windows Phone 8 and later.
Windows 8.1 and Windows Server 2012 R2: This function is supported for Windows Store apps on Windows 8.1, Windows Server 2012 R2, and later.