Thread: obtaining error description

Hi,

I can't seem to find out how to get the text description of a socket error progmatically.

For example, say I've got this code:

Code:

....

char buf[10];
int errno;

int retval = recv(sock, buf, 10, 0);
if (retval < 1) {
  errno = WSAGetLastError();
}

....

How would I then obtain a text description that describes errno?

I tried using strerror() which works correctly on *nix, but on Windows it just returns "No error"

Thanks in advance,

Daniel

Create a lookup table and reference it. Take a jog over to the msdn and read up on said codes and their values and descriptions. Or, search the MSDN to see if there is an already made list for you.

Quzah.

Windows error codes can be converted to a string description using the FormatMessage() function.

Code:

void DisplayError(DWORD dwError)
{
	TCHAR szMsg[1024];

	if (FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, dwError,
	                  MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
	                  szMsg, 1024, NULL))
	{
		printf("Error %d: %s\n", dwError, szMsg);
	}
	else
	{
		printf("Error %d: Unknown Error.\n", dwError);
	}
}

Code:

DisplayError(10060);

produces:

Error 10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

Thanks for the help people.

Why does windows have to be so awkward?....

This is what I came up with in the end:

Code:

void get_sockerrdesc(int errno, char *buffer, int bufsize) {
#ifdef _WIN32
	if (FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, errno,
		MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
		buffer, bufsize, NULL))
	{
		return 1;
	} else {
		strcpy(buffer,"Unknown Error");
		return 0;
	}
#else
	strcpy(buffer, strerror(errno));
#endif
}

Notice how the *nix equivalent is oh so much simpler

-dan