How make FILE* from HANDLE in WinApi?

Question

Is there easy way to create FILE* from WinApi HANDLE which points to one end of pipe? Something like we do in unix: fdopen(fd,);

Answer 1

you can't exchange(convert) them.. if you need to have a file with FILE* and HANDLE you need to open it twice

Answer 2

FILE* getReadBinaryFile(LPCWSTR path) {
    HANDLE hFile = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE) { 
        return nullptr; 
    }
    int nHandle = _open_osfhandle((long)hFile, _O_RDONLY);
    if (nHandle == -1) { 
        ::CloseHandle(hFile);   //case 1
        return nullptr; 
    }
    FILE* fp = _fdopen(nHandle, "rb");
    if (!fp) {
        ::CloseHandle(hFile);  //case 2
    }
    return fp;
}

my code for get an open read binary file descriptor.

you should use fclose to close FILE* if you don't need it .

i didn't test for case 1 and 2, so use it at your own risk.

Answer 3

You can do this but you have to do it in two steps. First, call _open_osfhandle() to get a C run-time file descriptor from a Win32 HANDLE value, then call _fdopen() to get a FILE* object from the file descriptor.