To convert the error code returned by GetLastError() to a message ID without using loops, you can use the FormatMessage function provided by the Windows API. This function
can retrieve the message string for a given error code and format it according to your requirements.
Here's an example of how to use the FormatMessage function to convert an error code to a message ID:
- Declare a buffer to store the message string and initialize it to NULL:
LPSTR messageBuffer = NULL;
- Call the FormatMessage function, passing in the error code, the location of the buffer, the size of the buffer, and any additional formatting options you require:
DWORD dwError = GetLastError();
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwError,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPSTR)&messageBuffer,
0,
NULL);
Check if the function succeeded by checking the return value. If it succeeded, the message string will be stored in the buffer:
if (messageBuffer != NULL)
{
// Use the message string as needed
printf("Error message: %s\n", messageBuffer);
// Free the buffer
LocalFree(messageBuffer);
}
By using the FormatMessage function, you can avoid the need for loops or custom tables to convert error codes to message IDs. Instead, the function will retrieve the message string for you and format it as required.
Reference:
Microsoft Docs. "FormatMessage function." https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-formatmessage
