having problem including __asm in MFC

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Hi,

I created a MFC dialog based app in VS2008 in Windows7 64bit. I placed some asm code:

C++

void CMfcAsmTestDlg::OnBnClickedButton1()
{
  char format[] = "%s %s\n";
  char hello[] = "Hello";
  char world[] = "world";

   __asm
   {
      mov  eax, offset world
      push eax
      mov  eax, offset hello
      push eax
      mov  eax, offset format
      push eax
      call printf
      //clean up the stack so that main can exit cleanly
      //use the unused register ebx to do the cleanup
      pop  ebx
      pop  ebx
      pop  ebx
   }
}

I get: error C2415: improper operand type. This happens on each line I used the word 'mov'.

Do I need to change any project settings or include any file?

Posted 9-Aug-11 0:52am

Mizan Rahman

Updated 9-Aug-11 0:58am

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mbue · Accepted Answer · 2011-08-09T01:12:00

This is because register eax accepts only long int types:

C++

void OnBnClickedButton1()
{
  char buff[256];
  char format[] = "%s %s\n";
  char hello[] = "Hello";
  char world[] = "world";
  unsigned int  f = (unsigned int)format,
                h = (unsigned int)hello,
                w = (unsigned int)world,
                b = (unsigned int)buff;

   __asm
   {
      mov  eax, w
      push eax
      mov  eax, h
      push eax
      mov  eax, f
      push eax
      mov  eax, b
      push eax
      call sprintf
      //clean up the stack so that main can exit cleanly
      //use the unused register ebx to do the cleanup
      pop  ebx
      pop  ebx
      pop  ebx
      pop  ebx
   }
}

Regards.