C++ 使用 Qt5 在 Windows 上获取 HWND（来自 WId）
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Get HWND on windows with Qt5 (from WId)
提问by Josef says Reinstate Monica
I am trying to convert a Qt4 Application to Qt5. The only thing I couldn't figure out is how to get the HWNDof a Widget. The program uses EcWin7to show the progress on the taskbar icon on win 7+ but expects a HWND. The lib itself seems to compile fine after changing Q_WS_WINto Q_OS_WIN) In Qt4 on Windows WIdwas just a typedef for HWND, so this was no problem. In Qt5 this is not the case anymore. I found some mailing list postingthat could give a clue but it seems QPlatformNativeInterfaceis not part of the public API of Qt5 anymore.
我正在尝试将 Qt4 应用程序转换为 Qt5。我唯一想不通的是如何获得小部件的HWND。该程序使用EcWin7在 win 7+ 上的任务栏图标上显示进度，但需要HWND。在将Q_WS_WIN更改为Q_OS_WIN后，lib 本身似乎编译得很好）在 Windows 上的 Qt4 WId只是HWND 的类型定义，所以这没问题。在 Qt5 中，情况不再如此。我发现了一些邮件列表中，可以给一个线索，但似乎QPlatformNativeInterface不是QT5的公共API的一部分了。
The program calls EcWin7.init(this->winId());and I need to some way to convert this ID into the HWNDid or some other way to get this.
程序调用EcWin7.init(this->winId()); 我需要某种方式将此 ID 转换为HWNDid 或以其他方式获取此 ID。
采纳答案by MrElmar
In Qt5 winEventwas replaced by nativeEvent:
在 Qt5 中winEvent被替换为nativeEvent：
bool winEvent(MSG* pMsg, long* result)
is now
就是现在
bool nativeEvent(const QByteArray & eventType, void * message, long *result)
And in EcWin7::winEventyou have to cast voidto MSG:
而在EcWin7::winEvent你必须投射void到MSG：
bool EcWin7::winEvent(void * message, long * result)
{
MSG* msg = reinterpret_cast<MSG*>(message);
if (msg->message == mTaskbarMessageId)
{
...
I was able to get the application to work! Just replace:
我能够让应用程序工作！只需更换：
mWindowId = wid;
with
和
mWindowId = (HWND)wid;
回答by KindDragon
#include <QtGui/5.0.0/QtGui/qpa/qplatformnativeinterface.h>
static QWindow* windowForWidget(const QWidget* widget)
{
QWindow* window = widget->windowHandle();
if (window)
return window;
const QWidget* nativeParent = widget->nativeParentWidget();
if (nativeParent)
return nativeParent->windowHandle();
return 0;
}
HWND getHWNDForWidget(const QWidget* widget)
{
QWindow* window = ::windowForWidget(widget);
if (window && window->handle())
{
QPlatformNativeInterface* interface = QGuiApplication::platformNativeInterface();
return static_cast<HWND>(interface->nativeResourceForWindow(QByteArrayLiteral("handle"), window));
}
return 0;
}
回答by TheFox
You may try:
你可以试试：
(HWND)QWidget::winId();
回答by user1111324
winId() worked for me on Qt 5.1 at least it has the same value when I'm using
winId() 在 Qt 5.1 上为我工作，至少在我使用时它具有相同的值
bool Widget::nativeEvent(const QByteArray & eventType, void * message, long * result)
{
MSG* msg = reinterpret_cast<MSG*>(message);
qDebug() << msg->hwnd;
return false;
}
and
和
qDebug() << winId();
回答by Filippok
Try this function: QWindowsNativeInterface::nativeResourceForWindow
试试这个功能： QWindowsNativeInterface::nativeResourceForWindow
