Re: DeleteFile shows as DeleteFileA

From:

Hector Santos <sant9442@nospam.gmail.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Fri, 09 Apr 2010 12:03:09 -0400

Message-ID:

<ueCMp4$1KHA.220@TK2MSFTNGP06.phx.gbl>

Giovanni Dicanio wrote:

"Goran" <goran.pusic@gmail.com> ha scritto nel messaggio
news:3d8eb75b-8d6f-4036-b3c0-2ee0b0f80dbe@u34g2000yqu.googlegroups.com...

Passing that UTF-8 string to DeleteFile (that is, "A" version will be
picked by the compiler) is quite likely to lead to trouble, and a +/-
subtle one (system presumes "ANSI" encoding, whereas string passed in
ain't that). So, conversion from UTF-8 to corresponding code page is
both restrictive and necessary.

So even if UTF-8 is used, it's better to define (_)UNICODE and to make
it a habit to go to UTF-16 before going to Win32.

Very good point, Goran!

Giovanni

BTW I really need to better learn this UNICODE crap. :)

Not sure if its related, maybe Goran to provide insight, I seem to
recall the need to use some OEM function in an old piece of code
related to this, I think, let me check..... Yeah...

       SetFileApisToOem()

Back in 1999, I forget the details, but we had to use it for an
console utility to help prepare finish the installation upgrade of a
locked file using the reboot procedure; MoveFileEx() for NT based
systems or preparing the wininit.ini.

Here is the C code I had, again, I don't recall the specifics why it
was needed. It might have been because we needed to make sure it
worked for Win95 as well.

// file: sysmove.cpp
#include <stdio.h>
#include <windows.h>

int main(int argc, char *argv[])
{
   char src[MAX_PATH] = {0};
   char tar[MAX_PATH] = {0};
   if (argc < 3) {
       printf("SysMove v1.1 (c)1999 Santronics Software Inc\n");
       printf("Prepares a system file for replace upon reboot.\n");
       printf("usage> sysmove sourcefile targetfile\n");
       return 1;
   }

   if (argc > 1) strncpy(src,argv[1], sizeof(src)-1);
   if (argc > 2) strncpy(tar,argv[2], sizeof(tar)-1);

   SetFileApisToOEM();

   OSVERSIONINFO osv = {0};
   osv.dwOSVersionInfoSize = sizeof(osv);
   GetVersionEx(&osv);

   if (osv.dwPlatformId == VER_PLATFORM_WIN32_NT) {
      printf("* Windows NT-based system\n");
      if (!MoveFileEx(src,tar,
                      MOVEFILE_DELAY_UNTIL_REBOOT |
                      MOVEFILE_REPLACE_EXISTING)) {
         printf("! MoveFileEx error %d\n", GetLastError());
         return 1;
      }
   }
   else { // assume Win95
      printf("* Windows 95\n");
      if (!WritePrivateProfileString("rename",src,tar,"wininit.ini")) {
         printf("! error %d - wininit.ini\n", GetLastError());
         return 1;
      }
   }
   printf("! Successful System File Move Preparation. Now reboot.");
   return 0;
}

--
HLS