请给一个LoadImageA的使用样例。

下面是一个使用LoadImageA函数加载位图资源的样例代码，具体实现步骤如下：

1. 定义一个名为hBitmap的HBITMAP类型的句柄，用于操作加载的位图资源。

2. 调用LoadImageA函数加载位图资源，并将返回的句柄赋值给hBitmap。

3. 将hBitmap绘制到窗口或控件的DC上，以显示位图内容。

#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   PSTR szCmdLine, int iCmdShow)
{
    static TCHAR szAppName[] = TEXT("LoadImageDemo");
    HWND hwnd;
    MSG msg;
    WNDCLASS wndclass;

    wndclass.style = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc = WndProc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = szAppName;

    if (!RegisterClass(&wndclass))
        return 0;

    hwnd = CreateWindow(szAppName, TEXT("LoadImage Demo"),
                        WS_OVERLAPPEDWINDOW,
                        CW_USEDEFAULT, CW_USEDEFAULT,
                        CW_USEDEFAULT, CW_USEDEFAULT,
                        NULL, NULL, hInstance, NULL);

    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);

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

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    static HBITMAP hBitmap;
    HDC hdc;
    PAINTSTRUCT ps;

    switch (message)
    {
    case WM_CREATE:
        hBitmap = (HBITMAP)LoadImage(NULL, TEXT("sample.bmp"), IMAGE_BITMAP,
                                     0, 0, LR_LOADFROMFILE);
        if (hBitmap == NULL)
        {
            MessageBox(hwnd, TEXT("Failed to load bitmap!"), TEXT("Error"), MB_OK | MB_ICONERROR);
            return -1;
        }
        break;

    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
        if (hdc == NULL)
            break;

        // 绘制位图
        HDC hdcMem = CreateCompatibleDC(hdc);
        HBITMAP hBitmapOld = (HBITMAP)SelectObject(hdcMem, hBitmap);
        BITMAP bm;
        GetObject(hBitmap, sizeof(bm), &bm);
        BitBlt(hdc, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
        SelectObject(hdcMem, hBitmapOld);
        DeleteDC(hdcMem);

        EndPaint(hwnd, &ps);
        break;

    case WM_DESTROY:
        DeleteObject(hBitmap);
        PostQuitMessage(0);
        break;

    default:
        return DefWindowProc(hwnd, message, wParam, lParam);
    }
    return 0;
}

在上述代码中，使用LoadImage函数加载sample.bmp位图资源，并在WM_PAINT消息中使用BitBlt函数将位图绘制到窗口的DC上，以显示位图内容。需要注意的是，在窗口销毁时需要使用DeleteObject函数释放hBitmap句柄，避免内存泄漏。