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Creating a console process without an MS-DOS window

Posted on 1999-01-26
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Last Modified: 2013-12-03
I want to use the CreateProcess API to create a Windows NT/95/98 process that does not have any UI, and does not pop up an MS-DOS window.  How do I do this?

I used the VC++ AppWizard for console process to create my process, but it is not doing any I/O so I do not want the window visible.

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Question by:tophermiller
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8 Comments
 
LVL 15

Expert Comment

by:NickRepin
ID: 1419308
Use DETACHED_PROCESS as creation flag in CreateProcess call.
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Author Comment

by:tophermiller
ID: 1419309
I tried using DETACHED_PROCESS and it doesn't have the desired effect.  I still get an MS-DOS window popping up.
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LVL 23

Expert Comment

by:chensu
ID: 1419310
Try the following code.

STARTUPINFO StartupInfo =
{
    sizeof(STARTUPINFO),
    NULL,
    NULL,
    NULL,
    0, 0,
    0, 0,
    0, 0,
    0,
    STARTF_USESHOWWINDOW,
    SW_HIDE,
    0,
    NULL,
    NULL,
    NULL,
    NULL
};

PROCESS_INFORMATION ProcessInformation;

::CreateProcess(NULL,
                _T("app.exe"),
                NULL,
                NULL,
                TRUE,
                0,
                NULL,
                NULL,
                &StartupInfo,
                &ProcessInformation);
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LVL 15

Expert Comment

by:NickRepin
ID: 1419311
chensu, your solution w/o DETACHED_PROCESS will display console.
STARTUPINFO doesn't matter.

It seems that tophermiller just doesn't want to pay his points.

Here is working sample

//---------------------
// b.exe parent process (window)
//---------------------
#include <windows.h>

int WINAPI WinMain(HINSTANCE,HINSTANCE,LPSTR,int)
{
   STARTUPINFO si;
   PROCESS_INFORMATION pi;
   ZeroMemory(&si,sizeof(si));
   si.cb = sizeof(si);

   CreateProcess(NULL,"a.exe",NULL,NULL,FALSE,
      DETACHED_PROCESS,NULL,NULL,&si,&pi);
   CloseHandle( pi.hProcess );
   CloseHandle( pi.hThread );
   return 0;
}#include <windows.h>
//------------------
//  a.exe child process (console)
//------------------
void main()
{
   for(;;) {
   MessageBeep(-1);
   Sleep(2000);
   }
}
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Author Comment

by:tophermiller
ID: 1419312
Thanks NickRepin.

I have no problem paying my points.  I just wanted to be sure to get to the bottom of it.  It turned out to be my bad, in that I was putting DETACHED_PROCESS into the STARTUP_INFORMATION flags instead of the creation flags in the CreateProcess call.  Your sample code alerted me to that.

Anyway, I'm rejecting chensu's answer, in the hopes that it will allow you to get the points instead.
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LVL 23

Expert Comment

by:chensu
ID: 1419313
Have you tried my code? The following is a complete version. ipconfig.exe is a Win32 console application in the Windows directory.

    STARTUPINFO StartupInfo =
    {
        sizeof(STARTUPINFO),
        NULL,
        NULL,
        NULL,
        0, 0,
        0, 0,
        0, 0,
        0,
        STARTF_USESHOWWINDOW,
        SW_HIDE,
        0,
        NULL,
        NULL,
        NULL,
        NULL
    };

    PROCESS_INFORMATION ProcessInformation;

    if (::CreateProcess(NULL,
                        _T("ipconfig.exe"),
                        NULL,
                        NULL,
                        TRUE,
                        0,
                        NULL,
                        NULL,
                        &StartupInfo,
                        &ProcessInformation))
    {
        ::CloseHandle(ProcessInformation.hProcess);
        ::CloseHandle(ProcessInformation.hThread);
    }
    else
    {
        LPVOID lpMsgBuf;
        ::FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
                        FORMAT_MESSAGE_FROM_SYSTEM,
                        NULL,
                        ::GetLastError(),
                        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                        (LPTSTR)&lpMsgBuf,
                        0,
                        NULL);
       
        // Display the string.
        ::AfxMessageBox((LPCTSTR)lpMsgBuf);
       
        // Free the buffer.
        ::LocalFree(lpMsgBuf);
    }
0
 
LVL 23

Expert Comment

by:chensu
ID: 1419314
Try it. It does work.
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LVL 15

Accepted Solution

by:
NickRepin earned 70 total points
ID: 1419315
Thanks.
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