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#include "ReadABuffer.h"
BOOL ReadABuffer(unsigned char * lpBuf, DWORD dwToWrite, HANDLE hComm)
{
OVERLAPPED osWrite = {0};
DWORD dwWritten;
BOOL fRes;
// Create this writes OVERLAPPED structure hEvent.
osWrite.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (osWrite.hEvent == NULL)
// Error creating overlapped event handle.
return FALSE;
// Issue write.
if (!ReadFile(hComm, lpBuf, dwToWrite, &dwWritten, &osWrite)) {
if (GetLastError() != ERROR_IO_PENDING) {
// WriteFile failed, but it isn't delayed. Report error and abort.
fRes = FALSE;
}
else {
// Write is pending.
if (!GetOverlappedResult(hComm, &osWrite, &dwWritten, TRUE))
fRes = FALSE;
else
// Write operation completed successfully.
fRes = TRUE;
}
}
else
// WriteFile completed immediately.
fRes = TRUE;
CloseHandle(osWrite.hEvent);
return fRes;
}
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