Question

How to create a window and print the x and y coordinates of the cursor in the title with C Win32 API

Answer 1

#include <windows.h>
#include <tchar.h>

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

int CALLBACK WinMain(
    _In_ HINSTANCE hInstance,
    _In_opt_ HINSTANCE hPrevInstance,
    _In_ LPSTR lpCmdLine,
    _In_ int nCmdShow) {

    static TCHAR szClassName[] = L"directx";

    WNDCLASSEX wc = { 0 };
    wc.cbSize = sizeof(wc);
    wc.style = CS_OWNDC;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = NULL;
    wc.hCursor = NULL;
    wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = szClassName;
    wc.hIconSm = NULL;

    if (!RegisterClassEx(&wc)) {
        return 1;
    }

    HWND hWnd = CreateWindowEx(
        0, szClassName, L"Window Title",
        WS_CAPTION | WS_MAXIMIZEBOX | WS_SYSMENU,
        300, 300, 640, 480, NULL, NULL, hInstance, NULL);

    if (!hWnd) {
        return 1;
    }

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

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

    return (int)msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
    TCHAR arr[32] = L"";

    switch (uMsg) {
        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
        case WM_LBUTTONDOWN: {
            const POINTS pt = MAKEPOINTS(lParam);
            wsprintf(arr, L"(x) %d - (y) %d", pt.x, pt.y);
            SetWindowText(hWnd, arr);
            break;
        }
    }
    
    return DefWindowProc(hWnd, uMsg, wParam, lParam);
}



/*
run:


*/

 

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