控件–TrackBar

使用WindowsAPI，创建TrackBar控件：

#include <windows.h>
#include <commctrl.h>
#include <stdio.h>

#pragma comment(lib, "comctl32.lib")

#define ID_TRACKBAR 101
#define ID_STATIC_TEXT 102

LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
    static HWND hTrackBar;
    static HWND hStaticText;

    switch (message) {
    case WM_CREATE: {
        // 创建 TrackBar 控件
        hTrackBar = CreateWindowEx(0, TRACKBAR_CLASS, NULL,
            WS_CHILD | WS_VISIBLE | TBS_AUTOTICKS | TBS_TOOLTIPS,
            10, 10, 300, 30, // x, y, width, height
            hwnd, (HMENU)ID_TRACKBAR, NULL, NULL);

        // 设置 TrackBar 的范围
        SendMessage(hTrackBar, TBM_SETRANGE, TRUE, MAKELPARAM(0, 100));
        SendMessage(hTrackBar, TBM_SETPOS, TRUE, 50); // 设置初始位置为 50

        // 创建静态文本控件以显示当前值
        hStaticText = CreateWindowEx(0, L"STATIC", L"Value: 50",
            WS_CHILD | WS_VISIBLE,
            10, 50, 300, 30, // x, y, width, height
            hwnd, (HMENU)ID_STATIC_TEXT, NULL, NULL);

        break;
    }
    case WM_HSCROLL: {
        if ((HWND)lParam == hTrackBar) {
            // 获取 TrackBar 的当前值
            int trackBarValue = SendMessage(hTrackBar, TBM_GETPOS, 0, 0);

            // 更新静态文本以显示当前值
            wchar_t buffer[50];
            swprintf(buffer, sizeof(buffer) / sizeof(wchar_t), L"Value: %d", trackBarValue);
            SetWindowText(hStaticText, buffer);
        }
        break;
    }
    case WM_SIZE: {
        // 处理窗口大小变化
        break;
    }
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, message, wParam, lParam);
    }
    return 0;
}

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR, int nCmdShow) {
    // 初始化 Common Controls
    INITCOMMONCONTROLSEX icex;
    icex.dwSize = sizeof(icex);
    icex.dwICC = ICC_BAR_CLASSES; // 初始化 TrackBar 控件类
    InitCommonControlsEx(&icex);

    // 创建窗口类
    WNDCLASS wc = {};
    wc.lpfnWndProc = WindowProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = L"TrackBarExample";
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);

    RegisterClass(&wc);

    // 创建窗口
    HWND hwnd = CreateWindowEx(
        0, L"TrackBarExample", L"TrackBar Control Example",
        WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        CW_USEDEFAULT, CW_USEDEFAULT, 400, 150,
        NULL, NULL, hInstance, NULL);

    // 消息循环
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0) > 0) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.wParam;
}

效果图：