The return value 0 (False) meanse that call failed. To get extended error information, call GetLastError. You can also use InternetGetLastResponseInfo when GetLastError returns ERROR_INTERNET_EXTENDED_ERROR.

>Hi,
>What does it meant if InternetWriteFile() return 0 and lpdwNumberOfBytesWritten set as ZERO after call it? Does it meant FAIL? If I call this function again, will the following data written on the right position?
>
>Thank you