How to check the remaining buffer size of pipe in windows in c/c++?

Question

BTW the remaining buffer will automatically increase if the other side reads data out of it,right?

Answer 1

How about PeekNamedPipe? It would seem that the following will return the total number of bytes remaining to be read from the pipe.

DWORD totalBytesAvailable;
BOOL WINAPI PeekNamedPipe(
  handle,                // __in       HANDLE hNamedPipe,
  NULL,                  // __out_opt  LPVOID lpBuffer,
  0,                     // __in       DWORD nBufferSize,
  NULL,                  // __out_opt  LPDWORD lpBytesRead,
  &totalBytesAvailable,  // __out_opt  LPDWORD lpTotalBytesAvail,
  NULL                   // __out_opt  LPDWORD lpBytesLeftThisMessage
);