How to create message handler for mdiclient using vc++ win32

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hello,
can anybody tell me how to create a handler for MDIClient control in vc++ win32, i mean a handler like LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) which handles hWnd window Drawing, painting, destroying and etc... here is the code how i create the mdiclient control

code:

C++

HWND ChildWindowCreation(HWND hWnd, HINSTANCE hInst){
	hwndClient = CreateWindow (TEXT ("MDICLIENT"), NULL, WS_CHILD |WS_BORDER|
	             WS_CLIPCHILDREN | WS_VISIBLE | WS_VSCROLL | WS_HSCROLL, 0, 0,  
                     0, 0, hWnd, (HMENU) 1, hInst,
                     (PSTR)&clientcreate) ;

	if(!hwndClient){
		MessageBox(NULL, "Program did not made the stuff ready for you", "Error", MB_OK|MB_ICONERROR);
	}

	return hwndClient;
}

and then i call the function in hWnd(parent window) in WM_create which creates it perfectly. so i wanted to have a handler for it either. can anybody tell me how.

Thanks in advance.

Posted 25-Jul-15 7:32am

Member 11593571

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Richard MacCutchan 26-Jul-15 3:26am

You create a message handler the same way you do for any window. There are many tutorials and samples to be found which show how it is done.

Member 11593571 26-Jul-15 10:03am

sorry could you redirect me to a tutorial where it could show me how its done?

Member 11593571 26-Jul-15 9:58am

anybody have any idea what to do?

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Answer 1 · 2015-07-26T05:26:00

Solution 1

See http://www.winprog.org/[^],
http://www.relisoft.com/index.htm[^],
http://www.codeguru.com/cpp/w-p/[^],
http://www.functionx.com/win32/index.htm[^],
http://www.blackwasp.co.uk/WindowsProgrammingArticles.aspx[^], etc, etc.

Posted 26-Jul-15 5:26am

Richard MacCutchan

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Member 11593571 26-Jul-15 15:16pm

those website are really useful, but unfortunately i have to say i didn't found what i wanted, and thanks for you reply

Richard MacCutchan 27-Jul-15 4:01am

Then I don't think you looked very hard. They all have samples and tutorials that show how to create Windows apps and handle windows messages. I know this because I have worked through most of them myself.

Member 11593571 27-Jul-15 13:39pm

hey bro there are laterally hundreds of link on each website you give me above so its kind of hard to find it, i mean i had my research there but no luck there, so i would be owner if you give me a specific link to help me with my problem and thanks for your help i appreciate it

Richard MacCutchan 27-Jul-15 14:03pm

Two mouse clicks took me to http://www.winprog.org/tutorial/window_click.html. Not that difficult.

Member 11593571 28-Jul-15 15:54pm

the link is for controlling message not for creating handlers for windows controls,

Richard MacCutchan 29-Jul-15 3:06am

The title of that section is "Handling Messages", and the sample code is exactly what you asked for in your original question, a WndProc message handler. I cannot make it any clearer.

Member 11593571 2-Aug-15 12:38pm

first of all sorry for my late reply, next i read the whole article in that website above, but that does not work as it suppose to i mean if you call wm_create and add some line of code to create you a button or on wm_paint when you try to create a rectangle or something it just does not work but the compiler compiles it without any error or something. here is the code how i am doing this

Code:
LRESULT CALLBACK WndProcclient(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_LBUTTONDOWN:
{
char szFileName[MAX_PATH];
HINSTANCE hInstance = GetModuleHandle(NULL);

GetModuleFileName(hInstance, szFileName, MAX_PATH);
MessageBox(hwnd, szFileName, "This program is:", MB_OK | MB_ICONINFORMATION);
}
break;
case WM_CREATE:
HWND Button1; // The name of the button will be Button1
Button1 = CreateWindowEx(0, "BUTTON", "Text on button", WS_CHILD | WS_VISIBLE, 220, 0, 100, 20,hwnd, (HMENU)3, hInst, 0);
break;
case WM_PAINT:
HDC Chdc;
PAINTSTRUCT pa;
Chdc = BeginPaint(hwndClient, &pa);
if(!Rectangle(Chdc, 0,0,10,10))
MessageBox(NULL, "Error while creating rectangle", "Error", MB_OK);
EndPaint(hwndClient, &pa);
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}

HWND ChildWindowCreation(HWND hWnd){
const char g_szClassName[] = "myWindowClass";
WNDCLASSEX wc;
HWND hwnd;
MSG Msg;
HINSTANCE clientInst;

wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WndProcclient;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = clientInst;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+25);
wc.lpszMenuName = NULL;
wc.lpszClassName = g_szClassName;
wc.hIconSm = NULL;

if(!RegisterClassEx(&wc))
{
MessageBox(NULL, "Window Registration Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}

hwndClient = CreateWindowEx(WS_EX_CLIENTEDGE, "MDICLIENT", NULL, WS_CHILD|WS_CLIPCHILDREN|WS_VISIBLE|WS_VSCROLL,
0, 0, 0, 0, hWnd, (HMENU) 1, clientInst,(PSTR)&clientcreate) ;

if(!hwndClient){
MessageBox(NULL, "Program did not made the stuff ready for you", "Error", MB_OK|MB_ICONERROR);
}

return hwndClient;
}
hope there is a solution for that,

Richard MacCutchan 2-Aug-15 14:07pm

Sorry, but it does work. Millions of Windows systems use this every day. If your code does not work then you are missing something from your program. I am not sure if your code above is supposed to be complete, but I do not see a message pump in there.

Member 11593571 2-Aug-15 15:41pm

yes, but do you see anything i am doing wrong in my code

Richard MacCutchan 3-Aug-15 2:28am

Like I said, I do not see a message pump anywhere in your code. So how are you expecting the messages to get dispatched to your windows?

Member 11593571 9-Aug-15 9:04am

least i made it working, and there is another problem, WM_CREATE does not works i mean the rest works fine like wm_paint and others work fine , but WM_CREATE doesn't here is my code:

LRESULT CALLBACK CustWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
HWND Button1; // The name of the button will be Button1
Button1 = CreateWindowEx(WS_EX_CLIENTEDGE, "BUTTON", "Text on button", WS_CHILD | WS_VISIBLE, 0, 0, 30, 30,hwndCtrl, (HMENU)3, GetModuleHandle(0), 0);
break;
case WM_PAINT:
HDC hdc;
PAINTSTRUCT ps;

hdc = BeginPaint(hwndCtrl, &ps);
EndPaint(hwndCtrl, &ps);
default:
break;
}

return DefWindowProc(hwnd, msg, wParam, lParam);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance; // Store instance handle in our global variable

hWnd = CreateWindow(szWindowClass, "FindMe", WS_OVERLAPPEDWINDOW/*WS_OVERLAPPED | WS_MINIMIZEBOX | WS_SYSMENU*/,
CW_USEDEFAULT, 0, 1014, 585, NULL, NULL, hInstance, NULL);

if (!hWnd)
{
return FALSE;
}

WNDCLASSEX wcs;

wcs.cbSize = sizeof(wcs);
wcs.lpszClassName = szClassName;
wcs.hInstance = GetModuleHandle(0);
wcs.lpfnWndProc = CustWndProc;
wcs.hCursor = LoadCursor(NULL, IDC_ARROW);
wcs.hIcon = 0;
wcs.lpszMenuName = 0;
wcs.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcs.style = 0;
wcs.cbClsExtra = 0;
wcs.cbWndExtra = 0;
wcs.hIconSm = 0;

if(!RegisterClassEx(&wcs))
{
MessageBox(NULL, "Window Registration Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}

hwndCtrl = CreateWindowEx(
0L, // give it a standard border
szClassName,
_T("A custom control"),
WS_VISIBLE|WS_CHILD|WS_VSCROLL|WS_BORDER,
0, 0, 0, 0,
hWnd,
NULL, GetModuleHandle(0), NULL
);

ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);

return TRUE;
}

as you can see it is suppose to make me a button but it basically doesn't, the rest works fine i mean like if i try to create a rectangle using wm_paint it works okay.

any solution are really appreciated

Richard MacCutchan 9-Aug-15 13:37pm

You should study the documentation for WM_CREATE and for WM_PAINT. You need to return a specific result to tell the system that you have handled these messages. Calling DefWindowProc is reserved for those messages that you do not handle.

Member 11593571 9-Aug-15 15:23pm

thanks sir, i think you are talking about wm_create to return something. i did added return 0; before break for wm_create which i think you know what that mean better than but still no result.

Richard MacCutchan 9-Aug-15 15:35pm

You still do not have a message pump in your code. I strongly suggest you go back to some of those links I gave you and work through them carefully, so you fully understand how a Windows program works.

Member 11593571 10-Aug-15 0:08am

i read all the documents you said and i did the way they are doing, could please tell me a particular point where i should pump message at.

Richard MacCutchan 10-Aug-15 3:46am

It is all explained in the tutorials, such as http://www.winprog.org/tutorial/window_click.html.

Member 11593571 10-Aug-15 5:13am

Thank you, fixed it, the problem was that i was trying to make it in hwndCtrl which i was suppose to put hwnd instead. and now it works perfect there is no problem of pumping messages. but anyway thank for you help

How to create message handler for mdiclient using vc++ win32

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