Author: Omid David Tabibi
Date: 04:35:42 02/08/04
Go up one level in this thread
On February 08, 2004 at 06:43:26, Jean Bouchat wrote: >We can't implement the move now command under winboard in our chess program. Our >problem is that we don't find a function that read stdin without waiting until >an entry arrives from winboard (scanf for instance). We already tried kbhit(), >if stdin != NULL, fgets but without result. >Note: our program is written in C and compiled with C++ builder. >- we are not specialist in programmation so don't be affraid to explain what >seems basic:). > >The "lodocase team" (Jean and Xavier) Under Windows you can use PeekNamedPipe function. From MSDN: -------- PeekNamedPipe The PeekNamedPipe function copies data from a named or anonymous pipe into a buffer without removing it from the pipe. It also returns information about data in the pipe. BOOL PeekNamedPipe( HANDLE hNamedPipe, // handle to pipe to copy from LPVOID lpBuffer, // pointer to data buffer DWORD nBufferSize, // size, in bytes, of data buffer LPDWORD lpBytesRead, // pointer to number of bytes read LPDWORD lpTotalBytesAvail, // pointer to total number of bytes available LPDWORD lpBytesLeftThisMessage // pointer to unread bytes in this message ); Parameters hNamedPipe Handle to the pipe. This parameter can be a handle to a named pipe instance, as returned by the CreateNamedPipe or CreateFile function, or it can be a handle to the read end of an anonymous pipe, as returned by the CreatePipe function. The handle must have GENERIC_READ access to the pipe. lpBuffer Pointer to a buffer that receives data read from the pipe. This parameter can be NULL if no data is to be read. nBufferSize Specifies the size, in bytes, of the buffer specified by the lpBuffer parameter. This parameter is ignored if lpBuffer is NULL. lpBytesRead Pointer to a 32-bit variable that receives the number of bytes read from the pipe. This parameter can be NULL if no data is to be read. lpTotalBytesAvail Pointer to a 32-bit variable that receives the total number of bytes available to be read from the pipe. This parameter can be NULL if no data is to be read. lpBytesLeftThisMessage Pointer to a 32-bit variable that receives the number of bytes remaining in this message. This parameter will be zero for byte-type named pipes or for anonymous pipes. This parameter can be NULL if no data is to be read. Return Values If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError. Remarks PeekNamedPipe is similar to the ReadFile function with the following exceptions: The data read from the pipe is not removed from the pipe's buffer. The function always returns immediately, even if there is no data in the pipe. The wait mode of a named pipe handle (blocking or nonblocking) has no effect on the function. The function can return additional information about the contents of the pipe. If the specified handle is a named pipe handle in byte-read mode, the function reads all available bytes up to the size specified in nBufferSize. For a named pipe handle in message-read mode, the function reads the next message in the pipe. If the message is larger than nBufferSize, the function returns TRUE after reading the specified number of bytes. In this situation, lpBytesLeftThisMessage will receive the number of bytes remaining in the message. QuickInfo Windows NT: Requires version 3.1 or later. Windows: Requires Windows 95 or later. Windows CE: Unsupported. Header: Declared in winbase.h. Import Library: Use kernel32.lib. See Also Pipes Overview, Pipe Functions, CreateFile, CreateNamedPipe, CreatePipe, ReadFile, WriteFile -------- If I remember correctly, Crafty also uses PeekNamedPipe. You can look at its source to see how it is used. Another option is to create a seperate thread that is responsible for input/output.
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