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message box non modal

closed account (zwA4jE8b)
how do I make a messagebox display that is not modal

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LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch(message)
	{
		case WM_DESTROY:
		{
			PostQuitMessage(0);
			return 0;
		} break;
		case WM_KEYDOWN:
		{
			switch (wParam)
			{
			case VK_NUMPAD4:
				_freq--;
				if(_freq < 1.0)
					_freq = 1.0;
				break;
			case VK_NUMPAD6:
				_freq++;
				break;
			case VK_NUMPAD8:
				_amp++;
				if(_amp > 200)
					_amp = 200;
				break;
			case VK_NUMPAD2:
				_amp--;
				if(_amp < 0)
					_amp = 0;
				break;
			case VK_SUBTRACT:
				_sTime++;
				if(_sTime > 50)
					_sTime = 50;
				break;
			case VK_ADD:
				_sTime--;
				if(_sTime < 10)
					_sTime = 10;
				break;
			case 0x48:
				MessageBox(NULL, "NUMPAD + : Increase speed\n"
						   "NUMPAD - : Decrease speed\n"
						   "NUMPAD 8 : Increase amplitude\n"
						   "NUMPAD 2 : Decrease amplitude\n"
						   "NUMPAD 4 : Increase frequency\n"
						   "NUMPAD 6 : Decrease frequency\n"
						   "\nChanges are small, hold the button",
						   "Help", MB_ICONASTERISK);
				break;
			}
			return 0;
		} break;
     }
     return DefWindowProc(hWnd, message, wParam, lParam);
 }


when h is pressed, I want the message box to display but allow the calling window to continue.
Last edited on
Lamblion (642)
You need to create your own message box by using CreateDialog()

http://msdn.microsoft.com/en-us/library/ms645434(v=vs.85).aspx
closed account (zwA4jE8b)
Thank you!
Lamblion (642)
By the way, if you are using CreateDialog() as your main window, you'll have to set a member of your class differently, like this --

wc.cbWndExtra=DLGWINDOWEXTRA;
Last edited on
closed account (zwA4jE8b)
Maybe you can help me a little more.

I have a main window, I just want a dialog box to popup to display the help.

What shall I use as the lpName parameter int CreateDialog()?

Line 107 is where i call CreateDialog and INT_PTR CALLBACK DialogProc is the function


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#include <Windows.h>
#include <math.h>

#define screen_width 800
#define screen_height 600
#define pi 3.14159

COLORREF blue = RGB(0, 0, 255);

double _freq = 50;
int _sTime = 10, _amp = 100;

LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
INT_PTR CALLBACK DialogProc(__in  HWND hwndDlg, __in  UINT uMsg, __in  WPARAM wParam, __in  LPARAM lParam);
void wavefunc(HWND, HDC);

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
	HWND hWnd;
	WNDCLASSEX wc;
	HDC hDC;

	ZeroMemory(&wc, sizeof(WNDCLASSEX));

	wc.cbSize = sizeof(WNDCLASSEX);
	wc.style = CS_HREDRAW | CS_VREDRAW;
	wc.lpfnWndProc = WindowProc;
	wc.hInstance = hInstance;
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hIcon = (HICON)LoadImage(NULL, "C:\\Visual Studio 2010\\Icons\\Smiley.ico", IMAGE_ICON, 0, 0, LR_LOADFROMFILE);
	wc.lpszClassName = "SineWave";

	RegisterClassEx(&wc);

	hWnd = CreateWindowEx(NULL,
                          "SineWave", "SineWave",
                          WS_SYSMENU,
                          0, 45,
                          screen_width, screen_height,
                          NULL, NULL,
                          hInstance,
                          NULL);

	ShowWindow(hWnd, nCmdShow);
	hDC = GetDC(hWnd);

	MSG msg;

	while(TRUE)
	{
		while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
		{DispatchMessage(&msg);}

		if(msg.message == WM_QUIT)
			break;

		wavefunc(hWnd, hDC);
	}
	return msg.wParam;
}

LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch(message)
	{
		case WM_DESTROY:
		{
			PostQuitMessage(0);
			return 0;
		} break;
		case WM_KEYDOWN:
		{
			switch (wParam)
			{
			case VK_NUMPAD4:
				_freq--;
				if(_freq < 1.0)
					_freq = 1.0;
				break;
			case VK_NUMPAD6:
				_freq++;
				break;
			case VK_NUMPAD8:
				_amp++;
				if(_amp > 200)
					_amp = 200;
				break;
			case VK_NUMPAD2:
				_amp--;
				if(_amp < 0)
					_amp = 0;
				break;
			case VK_SUBTRACT:
				_sTime++;
				if(_sTime > 50)
					_sTime = 50;
				break;
			case VK_ADD:
				_sTime--;
				if(_sTime < 10)
					_sTime = 10;
				break;
			case 0x48:
				CreateDialog(NULL, , hWnd, DialogProc);
				break;
			}
			return 0;
		} break;
     }
     return DefWindowProc(hWnd, message, wParam, lParam);
 }

INT_PTR CALLBACK DialogProc(__in  HWND hwndDlg, __in  UINT uMsg, __in  WPARAM wParam, __in  LPARAM lParam)
{
	MessageBox(NULL, "NUMPAD + : Increase speed\n"
					 "NUMPAD - : Decrease speed\n"
					 "NUMPAD 8 : Increase amplitude\n"
					 "NUMPAD 2 : Decrease amplitude\n"
					 "NUMPAD 4 : Increase frequency\n"
					 "NUMPAD 6 : Decrease frequency\n"
					 "\nChanges are small, hold the button",
					 "Help", MB_OK);
	return 0;
}

void wavefunc(HWND hWnd, HDC hDC)
{
	double full = 2 * pi * _freq;
	static double _x = 0;
	int _y = (sin(_x/_freq)*_amp) + 300;
	if (_x >= full)
		_x -= full;
	SetPixel(hDC, 600, _y, blue);
	ScrollWindow(hWnd, -1, 0, NULL, NULL);
	_x++;
	Sleep(_sTime);
}
Last edited on
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