Saturday, February 20, 2010

WSAStartup Function

The WSAStartup function initiates use of the Winsock DLL by a process.


int WSAStartup(   __in   WORD wVersionRequested,   __out  LPWSADATA lpWSAData ); 


wVersionRequested [in]

The highest version of Windows Sockets specification that the caller can use. The high-order byte specifies the minor version number; the low-order byte specifies the major version number.

lpWSAData [out]

A pointer to the WSADATA data structure that is to receive details of the Windows Sockets implementation.

Return Value

If successful, the WSAStartup function returns zero. Otherwise, it returns one of the error codes listed below.

The WSAStartup function directly returns the extended error code in the return value for this function. A call to theWSAGetLastError function is not needed and should not be used.


Error code Meaning

The underlying network subsystem is not ready for network communication.


The version of Windows Sockets support requested is not provided by this particular Windows Sockets implementation.


A blocking Windows Sockets 1.1 operation is in progress.


A limit on the number of tasks supported by the Windows Sockets implementation has been reached.


The lpWSAData parameter is not a valid pointer.


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