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MyExec, calls CreateProcess, waits for completion. WinBase

/ Published in: C++
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I occasionally need a WinExec function the synchronously executes a command. cwdArg may be null.

This example, upon error, pops-up a dialog and exits the app. This is useful for small installation utilities.

non-dot.net, with or without MFC.

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  1. static void MyExec( LPCSTR cmdArg, LPCSTR cwdArg )
  2. {
  3.    STARTUPINFO         si = {sizeof(STARTUPINFO)};
  4.    PROCESS_INFORMATION pi = {0};
  5.  
  6.    BOOL bOk = CreateProcess(
  7.       NULL,   // No module name (use command line)
  8.       (LPSTR)cmdArg, // Command line
  9.       NULL,   // Process handle not inheritable
  10.       NULL,   // Thread handle not inheritable
  11.       FALSE,  // Set handle inheritance to FALSE
  12.       0,      // No creation flags
  13.       NULL,   // Use parent's environment block
  14.       (LPSTR)cwdArg,   // Use parent's starting directory 
  15.       &si,    // Pointer to STARTUPINFO structure
  16.       &pi     // Pointer to PROCESS_INFORMATION structure
  17.    );
  18.  
  19.    // Wait until child process exits.
  20.    WaitForSingleObject( pi.hProcess, INFINITE );
  21.  
  22.    // Close process and thread handles. 
  23.    CloseHandle( pi.hProcess );
  24.    CloseHandle( pi.hThread );
  25.  
  26.    if ( bOk ) { return; }
  27.  
  28.    CString s;
  29.    s.Format( "Unable to execute '%s'", cmdArg );
  30.    MessageBox( NULL, s, APP_NAME, 0 );
  31.    exit(-1);
  32. }

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