create button and do something when its clicked

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May 16th, 2004, 05:48 PM

c0ldshadow

Join Date: Nov 2003

Posts: 510

Time spent in forums: 3 Days 15 m 46 sec
Reputation Power: 10

create button and do something when its clicked

i am trying to learn about win32 programs in C++. i want to simply make a button, and be able to do things when that button is clicked. i am having trouble finding a site that shows examples of how to make programs like this.

below i have the code for my simple win32 program.

could someone help me edit this code to have a button and show me how to make things happen when the button is clicked?

peace, --ave

Code:

#include <windows.h>
LRESULT CALLBACK WindowProcedure(HWND,UINT,WPARAM,LPARAM);
char szClassName[]="Filepool";
int WINAPI WinMain(HINSTANCE hThisInstance,HINSTANCE hPrevInstance,LPSTR lpszArgument,int nFunsterStil)
{
    HWND hwnd;
    MSG messages;
    WNDCLASSEX wincl;
    wincl.hInstance=hThisInstance;
    wincl.lpszClassName=szClassName;
    wincl.lpfnWndProc=WindowProcedure;
    wincl.style=CS_DBLCLKS;
    wincl.cbSize=sizeof(WNDCLASSEX);
    wincl.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    wincl.hIconSm=LoadIcon(NULL,IDI_APPLICATION);
    wincl.hCursor=LoadCursor(NULL,IDC_ARROW);
    wincl.lpszMenuName=NULL;
    wincl.cbClsExtra=0;
    wincl.cbWndExtra=0;
    wincl.hbrBackground=(HBRUSH)COLOR_BACKGROUND;
    if(!RegisterClassEx(&wincl))
    {
        return 0;
    }
    hwnd=CreateWindowEx(0,szClassName,"Filepool",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,544,375,HWND_DESKTOP,NULL,hThisInstance,NULL);
    ShowWindow(hwnd,nFunsterStil);
    while(GetMessage(&messages,NULL,0,0))
    {
        TranslateMessage(&messages);
        DispatchMessage(&messages);
    }
    return messages.wParam;
}
LRESULT CALLBACK WindowProcedure(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
    switch(message)
    {
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        default:
            return DefWindowProc(hwnd,message,wParam,lParam);
    }
    return 0;
}

May 16th, 2004, 06:56 PM

fisch

Contributing User

Join Date: Apr 2004

Location: Frostbite capital of the world

Posts: 542

Time spent in forums: 16 h 58 m 34 sec
Reputation Power: 10

check out the win32 tutorial at this site:
http://www.winprog.org/tutorial/

you can try this code. It should close the window and end the program when the button is clicked. I just pasted it together fast from some other stuff, so there might be some garbage in there that really isn't relevant.

Code:

#include <windows.h>
LRESULT CALLBACK WindowProcedure(HWND,UINT,WPARAM,LPARAM);
char szClassName[]="Filepool";
int WINAPI WinMain(HINSTANCE hThisInstance,HINSTANCE hPrevInstance,LPSTR lpszArgument,int nFunsterStil)
{
    HWND hwnd;
    MSG messages;
    WNDCLASSEX wincl;
    wincl.hInstance=hThisInstance;
    wincl.lpszClassName=szClassName;
    wincl.lpfnWndProc=WindowProcedure;
    wincl.style=CS_DBLCLKS;
    wincl.cbSize=sizeof(WNDCLASSEX);
    wincl.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    wincl.hIconSm=LoadIcon(NULL,IDI_APPLICATION);
    wincl.hCursor=LoadCursor(NULL,IDC_ARROW);
    wincl.lpszMenuName=NULL;
    wincl.cbClsExtra=0;
    wincl.cbWndExtra=0;
    wincl.hbrBackground=(HBRUSH)COLOR_BACKGROUND;
    if(!RegisterClassEx(&wincl))
    {
        return 0;
    }
    hwnd=CreateWindowEx(0,szClassName,"Filepool",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,544,375,HWND_DESKTOP,NULL,hThisInstance,NULL);
    ShowWindow(hwnd,nFunsterStil);
    while(GetMessage(&messages,NULL,0,0))
    {
        TranslateMessage(&messages);
        DispatchMessage(&messages);
    }
    return messages.wParam;
}
LRESULT CALLBACK WindowProcedure(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
HDC hdc;
static HWND hwndButton = 0;
static int cx, cy;/* Height and width of our button. */

    switch(message)
    {
        case WM_CREATE:
        {
           /* The window is being created. Create our button
            * window now. */
           TEXTMETRIC tm;

          /* First we use the system fixed font size to choose
           * a nice button size. */
           hdc = GetDC (hwnd);
           SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT));
           GetTextMetrics (hdc, &tm);
           cx = tm.tmAveCharWidth * 30;
            cy = (tm.tmHeight + tm.tmExternalLeading) * 2;
            ReleaseDC (hwnd, hdc);

             /* Now create the button */
            hwndButton = CreateWindow (
            "button",/* Builtin button class */
            "Click Here",
            WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
            0, 0, cx, cy,
            hwnd,/* Parent is this window. */
             (HMENU) 1,/* Control ID: 1 */
             ((LPCREATESTRUCT) lParam)->hInstance,
              NULL
             );

            return 0;
            break;
            }

           case WM_COMMAND:
           /* Check the control ID, notification code and
            * control handle to see if this is a button click
              * message from our child button. */
           if (LOWORD(wParam) == 1 &&
              HIWORD(wParam) == BN_CLICKED &&
              (HWND) lParam == hwndButton)
           {
           /* Our button was clicked. Close the window. */
           DestroyWindow (hwnd);
           }

        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        default:
            return DefWindowProc(hwnd,message,wParam,lParam);
    }
    return 0;
}

Last edited by fisch : May 16th, 2004 at 07:08 PM.

create button and do something when its clicked

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