Countdown Dialog DLL

Environment: [eg C/C++ W32, W95/98/2000,NT etc.]

Have you ever needed a messagebox style dialog to wait before allowing processing to continue and then disappear automatically? This DLL has a simple dialog box with a progress bar that does just that. You can enter the number of seconds, the default button, the caption and the prompt. It counts down with a progress bar then closes itself returning either IDOK or IDCANCEL. The user can also press the buttons to close the dialog before the timer does.


  • Everything's in the DLL
  • Easy to call function
  • Small footprint (32K)
  • Specify prompt, caption, seconds to close, default button
  • Pure Win32 API (no MFC, COM or ActiveX)
  • Optionally closes with loss of focus
  • Includes source code, test container and Visual C++ 6.0 project files. A good example for learning about DLLs.

Here's the calling code to use the DLL in your application. You'll also need to create a project and link in the common controls library, (commct32.lib) and the multithreading library.

// just include CountdownDialog.lib into your
// project.  Add the include file at the top
// of your source code (see below) and it's
// ready to use.

// Close on inactive option means that the dialog
// will close when the focus leaves--like when the
// user task switches to another application.

#include "commctrl.h"
#include "CountdownDialog.h"

// In your WinMain function...

   InitCommonControls(); // use new common controls

// Somewhere else like a push button event

   int ret = CountdownDialog(
      "Perform some task now?",
      "Sample Caption Message",
      20, /* seconds till close */
      IDCANCEL, /* default on close */
      false /* close with loss of focus */ 
   if ( ret == IDOK )
      // take the red pill :-)
      // take the blue pill :-(

// or dynamically...

#include "commctrl.h"
#include "CountdownDialog.h"

// In your WinMain function...

   InitCommonControls(); // use new common controls

// Somewhere else like a push button event

   HMODULE hwnd = LoadLibrary( "CountdownDialog.dll" );
   if ( hwnd == NULL )
      MessageBox( NULL, "LoadLibrary Failed", "Error", MB_OK );
   pfnCountdownDialog CDD = (pfnCountdownDialog) \
      GetProcAddress( hwnd,"CountdownDialog" );
   if ( CDD == NULL )
      MessageBox( NULL, "GetProcAddress Failed", "Error", MB_OK );
      FreeLibraryAndExitThread( hwnd, 0 );
   int ret = CDD( hwndParent, "Prompt", "Title", 
      2, IDCANCEL, FALSE );

   switch (ret)
   case IDOK:
      MessageBox( NULL, "IDOK", "Result", MB_OK );
   case IDCANCEL:
      MessageBox( NULL, "IDCANCEL", "Result", MB_OK );

Permissions: you can freely distribute and use this code in your projects as long as my name is in the revision log. Also, feel free to modify them and republish if you like as long as my name is still the log.


Download demo project - 174 Kb (approx.)
Download source - 4 Kb

This article was originally published on October 18th, 2001

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