PRB: Short File Name Autogeneration Fails on Windows 95 and Windows 95 SR 1 (222130)

RESOLUTION

To work around this problem, either rename the file/path to one that does not have the same first 8 characters, or to one that has a long path extension, for example, ".temp." This method causes the short filename to be regenerated correctly. To see this behavior in the example show in the "Symptoms" section, create a directory named "pathname", type "ren pathname pathname.temp", and then type "ren pathname.temp pathname1". The long and short filenames will be generated properly.

The following is sample code for a console application that renames the file through a unique temporary filename:

#include "stdafx.h"

#include <windows.h>
#include <winbase.h>
#include <stdlib.h>

int main(int argc, char* argv[])
{

	if (argc != 3) return 1; // Make sure we have source and destination paths.

	// Allocate and initialize storage.
	char szTempName[MAX_PATH], szTempPath[MAX_PATH];
	char * szOldName = argv[1];
	char * szNewName = argv[2];
	char szPrefix[2];
	char szDrive[MAX_PATH], szDir[MAX_PATH], szFname[MAX_PATH],
		szExt[MAX_PATH];
	ZeroMemory(szTempName, sizeof(szTempName));
	ZeroMemory(szTempPath, sizeof(szTempPath));
	ZeroMemory(szPrefix,sizeof(szPrefix));

	// Construct our necessary paths.
	_splitpath(szOldName, szDrive, szDir, szFname, szExt);
	strcpy(szTempPath, szDrive);
	strcat(szTempPath, szDir);
	
	// Create a filename that is different from the source filename by
	// generating a prefix string with a different first character.
	if (szFname[0] == 'Z')
		szPrefix[0] = 'A';
	else szPrefix[0] = 'Z';

	// Create a unique filename in the same directory.
	GetTempFileName(szTempPath, szPrefix, 0, szTempName);
	remove(szTempName); // GetTempFileName created this file--we need to nuke it.
	rename(szOldName, szTempName); // Do the first rename.
	rename(szTempName, szNewName); // Do the second rename.

	// All is well
	return 0;
}