Events on WinApi C++

[skoumas]

Hello there.

I am using Visual C++ Express right now.

I dont want to make applications throught the automated processes that this pack offers me, cause application gets much larger than they should have bin.

Yesterday I made my first step on WinApi: this is the result.

#include <windows.h>


char* App_Title = "Skoumas and the brains at the kangela";


LRESULT WINAPI myProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) 

{

	if(message == WM_CLOSE) {
	
		int apantisi;
		apantisi = MessageBox(NULL, "Are you Sure?",App_Title,1);

		if (apantisi==1)  
		PostQuitMessage(0);

		
	}
	return 0;
}

LRESULT WINAPI myProcbutton(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) 

{

	if(message == 1) {
	
		int apantisi;
		apantisi = MessageBox(NULL, "Are you Sure?",App_Title,1);

		if (apantisi==1)  
		PostQuitMessage(0);

		
	}
	return 0;
}


int APIENTRY WinMain(HINSTANCE, HINSTANCE, LPSTR, int)

{
MSG msg;


	HWND myDialog=CreateWindowEx(0, WC_DIALOG, App_Title, WS_OVERLAPPEDWINDOW | WS_VISIBLE,
		600, 100, 400, 200, NULL, NULL,NULL,NULL 
	);

	HWND button1=CreateWindowEx(	0,"BUTTON",	"My Button",BS_PUSHBUTTON | WS_VISIBLE | WS_CHILD,
		50,50,100,25,myDialog,NULL,NULL,NULL

	);

	
SetWindowLong(myDialog,	DWL_DLGPROC, (long) myProc);
SetWindowLong(button1,	DWL_DLGPROC, (long) myProcbutton);


	while(GetMessage(&msg,NULL,0,0)) 
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg); 

	} 


	return 0;

}

------------------------------------------------------

In this code you can see that the program generates a simple window and a button inside it.

I want to be able when i press the button to show a message box.

Can you please help me?

[heteroy]

There are several problems I can see here.

1) You should use the resource editor to create a dialog resource and then use CreateDialog vs CreateWindow when creating a dialog. You can put the button control in the dialog resource so you don't have to create it in code.

2) A button does not have a dialogproc. It has a wndproc which for what you are trying to do should be sufficient. What you need to do is have the dialog (parent of the button) handle WM_COMMAND message for BN_CLICK with the id of the button.

3) Before you start pumping messages, call ShowWindow(hDlg) and UpdateWindow(hDlg).

[skoumas]

http://www.tutorialized.com/view/tut...i-basics/27406

this is the tutorial that helped me to make the upper code.

[heteroy]

I don't much care for the tutorial you were looking at. If you are serious about learning windows, a good place to start is with Charles Petzold's Programming Windows 5th Edition.

In the meantime, I banged out a sample that works based on your code. It is compiled for UNICODE so you will have to set that in your project options.

#include <windows.h>

const WCHAR* App_Title = L"Skoumas and the brains at the kangela";
const UINT idButton = 101;

LRESULT WINAPI MyDlgProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) 
{
    switch (message)
    {
    case WM_CLOSE:
        {
            int apantisi;
            apantisi = MessageBox(NULL, L"Are you Sure?",App_Title,1);

            if (apantisi==1)  
            {
                PostQuitMessage(0);
            }
        }
        break;
        
    case WM_COMMAND:
        if (LOWORD(wParam) == idButton && HIWORD(wParam) == BN_CLICKED)
        {
		    int apantisi;
		    apantisi = MessageBox(NULL, L"Are you Sure?",App_Title,1);

		    if (apantisi==1)
            {
		        PostQuitMessage(0);
            }
        }
        break;

    default:
        break;

    }
    return 0;
}

int APIENTRY WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
    HWND hDlg = CreateWindowEx(0, WC_DIALOG, App_Title, WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        600, 100, 400, 200, NULL, NULL, NULL, NULL);

    if (hDlg)
    {
        SetWindowLong(hDlg,	DWL_DLGPROC, (long) MyDlgProc);
        HWND hwndBtn = CreateWindowEx(0, L"BUTTON", L"My Button", BS_PUSHBUTTON | WS_VISIBLE | WS_CHILD,
                       50, 50, 100, 25, hDlg, (HMENU)idButton, NULL, NULL);
        if (hwndBtn)
        {
            ShowWindow(hDlg, SW_SHOWNORMAL);
            UpdateWindow(hDlg);

            MSG msg;
            while(GetMessage(&msg,NULL,0,0)) 
            {
                TranslateMessage(&msg);
                DispatchMessage(&msg); 
            }
        }
    }
    return 0;
}