'WndClassEx.style = WS_OVERLAPPEDWINDOW' Not Registering

If the line WndClassEx.style = WS_OVERLAPPEDWINDOW is not registering or producing the desired result, it could be due to a couple of reasons:

1. Missing Constants: The WS_OVERLAPPEDWINDOW style constant might not be defined or accessible in your code. Ensure that you have the necessary header files included and that the constant is defined correctly. You may need to include the appropriate header file (e.g., <windows.h>) and ensure that the necessary macros or constants are available.

2. Incorrect Assignment: Double-check the assignment syntax and context of the WndClassEx structure. Make sure you are assigning the style value correctly to the style member of the WndClassEx structure. Verify that the structure is properly initialized before setting the style value.

Here's an example that demonstrates how to register a window class with the WS_OVERLAPPEDWINDOW style:

cppCopy code
#include <windows.h>



int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)

{

    // Define the window class

    WNDCLASSEX wcex = {};

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style = CS_HREDRAW | CS_VREDRAW;

    wcex.lpfnWndProc = WindowProc;

    wcex.hInstance = hInstance;

    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);

    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);

    wcex.lpszClassName = "MyWindowClass";



    // Register the window class

    if (!RegisterClassEx(&wcex))

    {

        // Handle registration failure

        return 1;

    }



    // Create the window using the registered class

    HWND hWnd = CreateWindowEx(

        0,

        "MyWindowClass",

        "My Window",

        WS_OVERLAPPEDWINDOW,

        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,

        NULL,

        NULL,

        hInstance,

        NULL

    );



    if (!hWnd)

    {

        // Handle window creation failure

        return 2;

    }



    // Show and update the window

    ShowWindow(hWnd, nCmdShow);

    UpdateWindow(hWnd);



    // Message loop

    MSG msg = {};

    while (GetMessage(&msg, NULL, 0, 0))

    {

        TranslateMessage(&msg);

        DispatchMessage(&msg);

    }



    return (int)msg.wParam;

}

In this example, the WS_OVERLAPPEDWINDOW style is assigned directly when creating the window using the CreateWindowEx function. The style is passed as the fourth parameter, specifying the window's initial style.

Make sure to adapt this example to your specific code and project context. Verify that the necessary header files are included and that the assignment of the style value is appropriate in your specific scenario.