writing text over a deleted button

In this example programme, i have a function that is called when a button is pressed, and the button get's deleted. The problem is in the function that the button calls, some of the text can't be seen, because the location where the button used to be has left a white space. I think it might be because i deleted the button after i called the function but i can't put it before or something really weird happens and the text isn't printed in the window.

Does anybody know a solution to this.

Code:

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#include <windows.h>

/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

/*  Make the class name into a global variable  */
char szClassName[ ] = "WindowsApp";
HINSTANCE hInstGlobal;

int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

{
    HWND hwnd;              /* This is the handle for our window */
    MSG messages;            /* Here messages to the application are saved */
    WNDCLASSEX wincl;        /* Data structure for the windowclass */

    /* The Window structure */
    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
    wincl.style = CS_DBLCLKS;                /* Catch double-clicks */
    wincl.cbSize = sizeof (WNDCLASSEX);

    /* Use default icon and mouse-pointer */
    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName = NULL;                /* No menu */
    wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
    wincl.cbWndExtra = 0;                      /* structure or the window instance */
    /* Use Windows's default color as the background of the window */
    wincl.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);

    /* Register the window class, and if it fails quit the program */
    if (!RegisterClassEx (&wincl))
        return 0;

    /* The class is registered, let's create the program*/
    hwnd = CreateWindowEx (
          0,                  /* Extended possibilites for variation */
          szClassName,        /* Classname */
          "Windows App",      /* Title Text */
          WS_OVERLAPPEDWINDOW, /* default window */
          CW_USEDEFAULT,      /* Windows decides the position */
          CW_USEDEFAULT,      /* where the window ends up on the screen */
          544,                /* The programs width */
          375,                /* and height in pixels */
          HWND_DESKTOP,        /* The window is a child-window to desktop */
          NULL,                /* No menu */
          hThisInstance,      /* Program Instance handler */
          NULL                /* No Window Creation data */
          );

    /* Make the window visible on the screen */
    ShowWindow (hwnd, nFunsterStil);

    /* Run the message loop. It will run until GetMessage() returns 0 */
    while (GetMessage (&messages, NULL, 0, 0))
    {
        /* Translate virtual-key messages into character messages */
        TranslateMessage(&messages);
        /* Send message to WindowProcedure */
        DispatchMessage(&messages);
    }

    /* The program return-value is 0 - The value that PostQuitMessage() gave */
    return messages.wParam;
}


HWND hButton;

void buttonpressed(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    hdc = GetDC (GetParent((HWND) lParam));
    HFONT font;
    PAINTSTRUCT ps;
    font = CreateFont(30, 0, 0, 0,
                          FW_NORMAL, FALSE, FALSE, FALSE,
                          ANSI_CHARSET, OUT_DEFAULT_PRECIS,
                        CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY,
                        DEFAULT_PITCH | FF_ROMAN,
                        "Times New Roman");

        SelectObject(hdc, font);
        TextOut(hdc, 10, 10, "When i delete a button the text cannot be seen!", 47);
        DeleteObject(font);

        EndPaint(hwnd, &ps);
       
}

/*  This function is called by the Windows function DispatchMessage()  */

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)                  /* handle the messages */
    {
        case WM_CREATE:
            hButton = CreateWindow ("BUTTON", "Press Me",
                                    WS_CHILD | WS_VISIBLE |
                                    BS_PUSHBUTTON,
                                    10, 10, 140, 20,
                                    hwnd, (HMENU) 1,
                                    hInstGlobal, NULL);
            return 0;
        case WM_COMMAND:
            if (HIWORD(wParam) == BN_CLICKED)
            {
                  if (LOWORD(wParam) == 1)
                  {
                      buttonpressed(hwnd, message, wParam, lParam);
                      DestroyWindow(hButton);
                      return 0;
                      }
                      return 0;
                      }
                  return 0;
           
        case WM_DESTROY:
            PostQuitMessage (0);      /* send a WM_QUIT to the message queue */
            break;
        default:                      /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);
    }

    return 0;
}

---

It is supposed to say
"When i deelete a button the text cannot be seen"

BeginPaint....EndPaint should only be called in the context of a WM_PAINT handler where you should move your drawing code anyway. To effect the update in drawing in response to the button click then call InvalidateRect in your BN_CLICKED notification message handler.

You can create two controls one on top of the other. Then there is no need to draw on the window.....

Then just hide the button and show the text (static control)

Use ShowWindow() SW_HIDE SW_SHOW. When creating the controls set the WS_VISIBLE for the one you want to see and remove it (or call ShowWindow) one the one you want to hide.

hey thanks, by hiding it before i call the function i can see all the text

Disabling the button worked but in the function that i call, if i create a button in that function the problem comes back.

This is what i now have, but with the same problem.

Code:

---

#include <windows.h>

/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

/*  Make the class name into a global variable  */
char szClassName[ ] = "WindowsApp";
HINSTANCE hInstGlobal;

int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

{
    HWND hwnd;              /* This is the handle for our window */
    MSG messages;            /* Here messages to the application are saved */
    WNDCLASSEX wincl;        /* Data structure for the windowclass */

    /* The Window structure */
    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
    wincl.style = CS_DBLCLKS;                /* Catch double-clicks */
    wincl.cbSize = sizeof (WNDCLASSEX);

    /* Use default icon and mouse-pointer */
    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName = NULL;                /* No menu */
    wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
    wincl.cbWndExtra = 0;                      /* structure or the window instance */
    /* Use Windows's default color as the background of the window */
    wincl.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);

    /* Register the window class, and if it fails quit the program */
    if (!RegisterClassEx (&wincl))
        return 0;

    /* The class is registered, let's create the program*/
    hwnd = CreateWindowEx (
          0,                  /* Extended possibilites for variation */
          szClassName,        /* Classname */
          "Windows App",      /* Title Text */
          WS_OVERLAPPEDWINDOW, /* default window */
          CW_USEDEFAULT,      /* Windows decides the position */
          CW_USEDEFAULT,      /* where the window ends up on the screen */
          544,                /* The programs width */
          375,                /* and height in pixels */
          HWND_DESKTOP,        /* The window is a child-window to desktop */
          NULL,                /* No menu */
          hThisInstance,      /* Program Instance handler */
          NULL                /* No Window Creation data */
          );

    /* Make the window visible on the screen */
    ShowWindow (hwnd, nFunsterStil);

    /* Run the message loop. It will run until GetMessage() returns 0 */
    while (GetMessage (&messages, NULL, 0, 0))
    {
        /* Translate virtual-key messages into character messages */
        TranslateMessage(&messages);
        /* Send message to WindowProcedure */
        DispatchMessage(&messages);
    }

    /* The program return-value is 0 - The value that PostQuitMessage() gave */
    return messages.wParam;
}


HWND hButton, hName;


void buttonpressed(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
   
    HDC hdc;
   
    hdc = GetDC (GetParent((HWND) lParam));
    HFONT font;
    PAINTSTRUCT ps;
    font = CreateFont(30, 0, 0, 0,
                          FW_NORMAL, FALSE, FALSE, FALSE,
                          ANSI_CHARSET, OUT_DEFAULT_PRECIS,
                        CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY,
                        DEFAULT_PITCH | FF_ROMAN,
                        "Times New Roman");

        SelectObject(hdc, font);
        TextOut(hdc, 10, 10, "When i delete a button the text cannot be seen!", 47);
        DeleteObject(font);

        EndPaint(hwnd, &ps);
       
       
       
}

void buttonpressedl(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    buttonpressed(hwnd, message, wParam, lParam);
}

/*  This function is called by the Windows function DispatchMessage()  */

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)                  /* handle the messages */
    {
        case WM_CREATE:
            hButton = CreateWindow ("BUTTON", "Press Me",
                                    WS_CHILD | WS_VISIBLE |
                                    BS_PUSHBUTTON,
                                    10, 10, 140, 20,
                                    hwnd, (HMENU) 1,
                                    hInstGlobal, NULL);
           
            return 0;
        case WM_COMMAND:
            if (HIWORD(wParam) == BN_CLICKED)
            {
                  if (LOWORD(wParam) == 1)
                  {
                      ShowWindow(hButton, SW_HIDE);
                     
                     
                     
                      buttonpressedl(hwnd, message, wParam, lParam);
                        DestroyWindow(hButton);
                      return 0;
                      }
                      return 0;
                      }
                  return 0;
           
        case WM_DESTROY:
            PostQuitMessage (0);      /* send a WM_QUIT to the message queue */
            break;
        default:                      /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);
    }

    return 0;
}

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