qt - 试图获取窗口的屏幕截图

Question

我正在尝试运行此代码：

QPixmap ss = QScreen::grabWindow((WId) FindWindow(NULL, L"Blacklight Retribution"));
ss.save("haystack.png", "png");

但我收到此错误：

error: C2352: 'QScreen::grabWindow' : illegal call of non-static member function

Answer 1

你可以尝试这样的事情：

QScreen *screen = QGuiApplication::primaryScreen();
if (screen)
{
    QPixmap ss = screen->grabWindow((WId) FindWindow(NULL, L"Blacklight Retribution"));
}

Answer 2

Qt 5 更新了 Screenshot 示例，shootScreen 函数如下所示：

void Screenshot::shootScreen()
{
    QScreen *screen = QGuiApplication::primaryScreen();
    if (const QWindow *window = windowHandle())
        screen = window->screen();
    if (!screen)
        return;

    originalPixmap = screen->grabWindow(0);
    updateScreenshotLabel();
}