标签: queued-connection

我有这样的课：

#include <QObject>
namespace taservices
{
    class ProcessHandle : public QObject
    {
        Q_OBJECT
    public:
        ProcessHandle(const void* const processContextPointer, const QString& process_id = "", QObject *parent = 0);
        ProcessHandle();
    signals:
        void progress(const ProcessHandle* const self, const int value);
    private:
        static void registerAsMetaType();
}

我有一个信号：

void progress(const ProcessHandle* const self, const int value);

我想通过QueuedConnedtion连接它。我不断收到此消息：

QObject::connect: Cannot queue arguments of type 'ProcessHandle*const'
(Make sure 'ProcessHandle*const' is registered using qRegisterMetaType().)

声明后，我像这样注册我的课程：

Q_DECLARE_METATYPE(taservices::ProcessHandle*);

我还添加了从构造函数调用的此静态方法：

void ProcessHandle::registerAsMetaType()
{
    static bool called = false;
    if(!called) {
        called …