Question

How to use the TextOut function to draw text at a specified location using the Win32 API in C

Answer 1

#include <windows.h>

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    switch (msg) {
    case WM_PAINT: {
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint(hwnd, &ps);

        // Draw text at position (50, 50)
        const wchar_t* msg = L"Win32 API!";
        TextOutW(hdc, 50, 50, msg, lstrlenW(msg));


        // hdc → device context
        // x, y → pixel coordinates (50, 50)
        // L"Win32 API" → text to draw
        // lstrlenW(msg) → number of characters

        EndPaint(hwnd, &ps);
        return 0;
    }

    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

    return DefWindowProcW(hwnd, msg, wParam, lParam);
}

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    PWSTR pCmdLine, int nCmdShow) {

    const wchar_t CLASS_NAME[] = L"TextOutExampleClass";

    WNDCLASSW wc;
    ZeroMemory(&wc, sizeof(wc));

    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = CLASS_NAME;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);

    RegisterClassW(&wc);

    HWND hwnd = CreateWindowExW(
        0,
        CLASS_NAME,
        L"TextOut Example (C)",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT,
        500, 300,
        NULL,
        NULL,
        hInstance,
        NULL
    );

    if (!hwnd) {
        return 0;
    }

    ShowWindow(hwnd, nCmdShow);

    MSG msg;
    while (GetMessageW(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessageW(&msg);
    }

    return 0;
}




/*
run



*/

 

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