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Problem with VC++

Posted on 1998-08-11
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Last Modified: 2013-11-20
I wrote a program who must read from a file a path from an executable program and execute it .
This is:

#include <stdio.h>
#include <process.h>
...
      FILE *f;
      char  s[100];
      f=fopen("c:\\file.txt","r");   //in file.txt is the path (let say it is "C:\\prg.exe")
      fscanf(f,"%s",s);
      fclose(f);
      _spawnlp(_P_NOWAIT,s,s,0); //should execute the program prg.exe

I compiled this in Borland 4.5 and it works
When I compiled this in VC++ 5.0 wouldn't work ( the program doesn't respond (in Windows 95))
Can somebody give me an example of a correct code ?
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Question by:pasare
  • 2
3 Comments
 
LVL 23

Expert Comment

by:chensu
ID: 1320620
For Win32 applications, use the CreateProcess function instead of _spawnlp.

STARTUPINFO StartupInfo =
{
    sizeof(STARTUPINFO),
    NULL,
    NULL,
    NULL,
    0, 0,
    0, 0,
    0, 0,
    0,
    STARTF_USESHOWWINDOW,
    SW_SHOW,
    0,
    NULL,
    NULL,
    NULL,
    NULL
};
PROCESS_INFORMATION ProcessInformation;
BOOL bRetVal = ::CreateProcess(NULL,
                                             s,
                                             NULL,
                                             NULL,
                                             FALSE,
                                             0,
                                             NULL,
                                             NULL,
                                             &StartupInfo,
                                             &ProcessInformation);
if (bRetVal)
{
    ::CloseHandle(ProcessInformation.hProcess);
    ::CloseHandle(ProcessInformation.hThread);
}

0
 

Author Comment

by:pasare
ID: 1320621
Still doesn't work. I suggest you to try it .
However if I call _spawnlp(_P_NOWAIT,"c:\\prg.exe","c:\\prg.exe",0) this works but when
I read from a file the string, won't work . I debug the program and the string s  is "c:\\prg.exe" ( reading  from file is executed well ) .
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LVL 23

Accepted Solution

by:
chensu earned 800 total points
ID: 1320622
I guess you wrote "c:\\prg.exe" in the text file. The double '\' is only needed for C++ source code since '\' is an escape character. Write "c:\prg.exe" in the text file.
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