Thread: Timer help

Hello,

I have a simple Win32 program which I want to add a timer to. The thing is, I don't know where I would put the SetTimer() line to make the program do the stuff after the IDT_TIMER in order for it to work - where abouts should I put the SetTimer() line?

Code:

#include <windows.h>
#include <math.h>
#include <cmath>
#include <cstdio>
#include "resource.h"

BOOL CALLBACK ToolDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
	switch(Message)
	{
		case WM_COMMAND:

			switch(LOWORD(wParam))
			{

			case IDT_TIMER:

               ...Do things when timer ticks.

				break;	

			}
		break;

		case WM_CLOSE:
			EndDialog(hwnd, 0);
		    break;

		default:
			return FALSE;
	}
	return TRUE;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
	LPSTR lpCmdLine, int nCmdShow)
{
	return DialogBox(hInstance, MAKEINTRESOURCE(IDD_CLOCK), NULL, ToolDlgProc);

}

Thanks.

Ideally, the timer would be set when the program is started, because I designed it as a clock which displays and updates the system time in some dialog boxes, so I want to create a timer which ticks every second, and when it does, updates the system time.

Thanks.

Originally Posted by george7378

Hello,

I have a simple Win32 program which I want to add a timer to. The thing is, I don't know where I would put the SetTimer() line to make the program do the stuff after the IDT_TIMER in order for it to work - where abouts should I put the SetTimer() line?

Code:

#include <windows.h>
#include <math.h>
#include <cmath>
#include <cstdio>
#include "resource.h"

BOOL CALLBACK ToolDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
	switch(Message)
	{
		case WM_COMMAND:

			switch(LOWORD(wParam))
			{

			case IDT_TIMER:

               ...Do things when timer ticks.

				break;	

			}
		break;

		case WM_CLOSE:
			EndDialog(hwnd, 0);
		    break;

		default:
			return FALSE;
	}
	return TRUE;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
	LPSTR lpCmdLine, int nCmdShow)
{
	return DialogBox(hInstance, MAKEINTRESOURCE(IDD_CLOCK), NULL, ToolDlgProc);

}

Thanks.

In this code the best place to start the timer is in response to the WM_INITDIALOG message posted to the message loop when the dialog is created.

Then to handle your timer events you would use WM_TIMER messages issued by the timers to call a function to update your clock display.

The place to kill your timers is inresponse to the WM_CLOSE message.



I noted that you want to tick it once a second... try twice or three times a second as any minor inaccuracies will be less apparent to the viewer.

Lots of good information about timers --> here

Code:

#include <windows.h>
#include <math.h>
#include <cmath>
#include <cstdio>
#include "resource.h" 

BOOL CALLBACK ToolDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
	switch(Message)
	{

	case WM_INITDIALOG:
        SetTimer(hwnd, IDT_TIMERCLOCK, 500, NULL);
		return TRUE;
		break;

	case WM_COMMAND:
		switch(LOWORD(wParam))
			{
			}
		break;

	case WM_TIMER:
			{
      Get the time and date, display.

				break;	}

		case WM_CLOSE:
			EndDialog(hwnd, 0);
		    break;

		default:
			return FALSE;
	}
	return TRUE;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
	LPSTR lpCmdLine, int nCmdShow)
{
	return DialogBox(hInstance, MAKEINTRESOURCE(IDD_CLOCK), NULL, ToolDlgProc);
}

Thanks a lot for that guys, the above code works beautifully.

Not with the current line 25 it doesn't....

Oh yes, I have some code in there rather than just words. There is also a header and resource file.