TextOut in a Win32 Application

[Firecore]

Does anyone know how to use this?
I was browsing a few tutorials on the net, and I saw one that shows how to display stuff on the screen.
I added a few events.
This is my code:

#include <windows.h> // FOR ANY DIFFICULTIES, REFER TO THE MSDN. IT IS VERY USEFUL.
 
HWND hwndMain;
 
LRESULT CALLBACK MainWndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam);//CALLBACK function prototype
 
 
int WINAPI WinMain(HINSTANCE hInstance, 
                   HINSTANCE hPrevInstance, 
                   LPSTR lpCmdLine, 
                   INT nCmdShow)
{
    MessageBox(NULL,"This is a test of Lesson 02", "Lesson 02 Test",MB_OK);
 
    MSG msg; //var to store messages
    WNDCLASSEX window; //WINDOW class information
 
    //initialize all values of window struct to zero
    ZeroMemory(&window,sizeof(WNDCLASSEX));
 
    window.cbSize = sizeof(WNDCLASSEX);// Window Size. Must always be sizeof(WNDCLASSEX)
 
    window.style = CS_HREDRAW|CS_VREDRAW |CS_DBLCLKS ; // Class styles. These are necessary for a proper functioning window
 
    window.lpfnWndProc = (WNDPROC)MainWndProc; // Pointer to the callback procedure
 
    window.cbClsExtra = 0; //Specifies the number of extra bytes to allocate following the window-class structure. The system initializes the bytes to zero. 
 
    window.cbWndExtra = 0; //Specifies the number of extra bytes to allocate following the window instance. The system initializes the bytes to zero. If an application uses WNDCLASSEX to register a dialog box created by using the CLASS directive in the resource file, it must set this member to DLGWINDOWEXTRA. 
 
    window.hInstance = hInstance; //Instance of the application. Notice that it is the same one from the WinMain prototype
 
    window.hIcon = NULL; // Icon of the window class
 
    window.hCursor = LoadCursor(NULL, IDC_ARROW);// Class cursor.
 
    window.hbrBackground = (HBRUSH)(COLOR_WINDOW); /*Handle to the class background brush. 
                                                This member can be a handle to the physical brush to be used for painting the background, or it can be a color value. 
                                                A color value must be one of the following standard system colors (the value 1 must be added to the chosen color). 
                                                */
    window.lpszMenuName = NULL; //Menu resource
 
    window.lpszClassName = "Lesson2"; // Name of this class
 
    window.hIconSm = LoadIcon(NULL,"logo.bmp"); // Small icon for this class
 
    // Register this window class with MS-Windows
    if (!RegisterClassEx(&window))
        return 0;
 
 
    //Now to create the window!
 
    // Create the window
 
    hwndMain = CreateWindowEx(0, //Extended window style
                "Lesson2", // Window class name
                "Lesson 2 - A simple win32 application", // Window title
                WS_OVERLAPPEDWINDOW, // Window style
                CW_USEDEFAULT,CW_USEDEFAULT, // (x,y) pos of the window
                CW_USEDEFAULT,CW_USEDEFAULT, // Width and height of the window
                HWND_DESKTOP, // HWND of the parent window (can be null also)
                NULL, // Handle to menu
                hInstance, // Handle to application instance
                NULL); // Pointer to window creation data
 
 
    // Check if window creation was successful
    if (!hwndMain)
        return 0;
 
    //Make window visible
 
    ShowWindow(hwndMain,SW_SHOW);
 
    // Process messages coming to this window
 
    while (GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
 
 
 
    // return value to the system
 
    return msg.wParam;
}
 
LRESULT CALLBACK MainWndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
    PAINTSTRUCT paintStruct;
 
 
    HDC hDC;
    char message[] = "KILL ALL HUMANS";
 
 
    switch (msg)
    {
        case WM_DESTROY:
            // User closed the window
            MessageBox(NULL, "Exit","CAPTION",NULL);
            PostQuitMessage(0);
            break;
        case WM_LBUTTONDOWN:
            //User pressed the left mouse button
            MessageBox(hwnd,"BEEP","BEEP",MB_OK | MB_APPLMODAL);
            MessageBeep(MB_OK);
            MessageBox(NULL,"PRINTING TO SCREEN","CAPTION",NULL);
 
            //paint to screen
            hDC = BeginPaint(hwnd,&paintStruct);
 
            /* Set Text color to blue */
            SetTextColor(hDC, COLORREF(0x00FF0000));
 
            /* Display text in the middle of the window */
            TextOut(hDC,150,150,message,sizeof(message)-1);
 
            //Tell OS you are done painting
            EndPaint(hwnd, &paintStruct);
 
            return 0;
            break;
 
        case WM_CHAR:
            //User Pressed a character from the keyboard
            MessageBox(NULL, "You Pressed a Key","CAPTION",NULL);
            break;
    //    case WM_ACTIVATE:
    //        MessageBox(NULL,"THE FORM IS ACTIVE","CAPTION",NULL);
    //        break;
 
 
        default:
            // Call the default window handler
            return DefWindowProc(hwnd,msg,wParam,lParam);
    }
    return 0;
}
 

I searched and searched and I just cand find why it does not work.
Have I got my theory wrong?

[xoinki]

hi,
Did u try Updatewindow() after showwindow?
Xoinki

[Banfa]

        case WM_LBUTTONDOWN:
            //User pressed the left mouse button
            MessageBox(hwnd,"BEEP","BEEP",MB_OK | MB_APPLMODAL);
            MessageBeep(MB_OK);
            MessageBox(NULL,"PRINTING TO SCREEN","CAPTION",NULL);
 
            //paint to screen
            hDC = BeginPaint(hwnd,&paintStruct);
 
            /* Set Text color to blue */
            SetTextColor(hDC, COLORREF(0x00FF0000));
 
            /* Display text in the middle of the window */
            TextOut(hDC,150,150,message,sizeof(message)-1);
 
            //Tell OS you are done painting
            EndPaint(hwnd, &paintStruct);
 
            return 0;
            break;
 

BeginPaint and EndPaint are only for use while handling a WM_PAINT message (I suggest you look them up on MSDN).

UpdateWindow forces a the window to be sent a WM_PAINT message forcing a screen update if you have implemented a WM_PAINT handler.

You should either

1. Call GetDC and Release DC instead of BeginPaint and EndPaint in you WM_LBUTTONDOWN handler
2. Implement the WM_PAINT handler and move the code that draws to the screen into that handler

[Firecore]

BeginPaint and EndPaint are only for use while handling a WM_PAINT message (I suggest you look them up on MSDN).

UpdateWindow forces a the window to be sent a WM_PAINT message forcing a screen update if you have implemented a WM_PAINT handler.

You should either

1. Call GetDC and Release DC instead of BeginPaint and EndPaint in you WM_LBUTTONDOWN handler
2. Implement the WM_PAINT handler and move the code that draws to the screen into that handler

I see. I shall try that