对于 Qt,我是 C++ 的新手。我有以下问题:我想在 Qt header 公共(public)部分中实例化一个 CLEyeCameraCapture 对象,但是我从 CLEyeCameraCapture.h 中得到大量语法错误。
我收到以下(德语)语法错误:
CLEyeCameraCapture.h(7) : error C2146: Syntaxfehler: Fehlendes ';' vor Bezeichner '_windowName' CLEyeCameraCapture.h(7) : error C4430: Fehlender Typspezifizierer - int wird angenommen. Hinweis: "default-int" wird von C++ nicht unterstützt.
CLEyeCameraCapture.h(7): error C4430: Fehlender Typspezifizierer - int wird angenommen. Hinweis: "default-int" wird von C++ nicht unterstützt.
CLEyeCameraCapture.h(8) : error C2146: Syntaxfehler: Fehlendes ';' vor Bezeichner '_cameraGUID' CLEyeCameraCapture.h(8) : error C4430: Fehlender Typspezifizierer - int wird angenommen. Hinweis: "default-int" wird von C++ nicht unterstützt.
……等等……
在此先感谢您的帮助。这是我的代码:
qtdevc.h(我的应用程序类的头文件)
#ifndef QTDEVC_H
#define QTDEVC_H
#include <QtGui/QMainWindow>
#include "ui_qtdevc.h"
#include <QString>
#include <QDebug>
#include <CLEyeCameraCapture.h>
#include <stdafx.h>
class qtDEVC : public QMainWindow
{
Q_OBJECT
public:
qtDEVC(QWidget *parent = 0, Qt::WFlags flags = 0);
~qtDEVC();
Ui::qtDEVCClass ui;
CLEyeCameraCapture::CLeyeCameraCapture cam;
private:
QPushButton *PushButton_startCam;
QPushButton *PushButton_stopCam;
QPushButton *PushButton_startLogging;
QPushButton *PushButton_quit;
QLineEdit *lineEditID;
// begin new code
public slots:
int startCam();
void stopCam();
void quit();
// end new code
};
#endif // QTDEVC_H
CLEyeCameraCapture.h
#ifndef CLEYECAMERACAPTURE_H
#define CLEYECAMERACAPTURE_H
// Sample camera capture class
class CLEyeCameraCapture
{
CHAR _windowName[256];
GUID _cameraGUID;
CLEyeCameraInstance _cam;
CLEyeCameraColorMode _mode;
CLEyeCameraResolution _resolution;
float _fps;
HANDLE _hThread;
bool _running;
std::string _participant;
public:
CLEyeCameraCapture(LPSTR windowName, GUID cameraGUID, CLEyeCameraColorMode mode, CLEyeCameraResolution resolution, float fps) :
_cameraGUID(cameraGUID), _cam(NULL), _mode(mode), _resolution(resolution), _fps(fps), _running(false)
{
strcpy(_windowName, windowName);
}
double GetRandomNormalized();
bool StartCapture(std::string ID);
void StopCapture();
void IncrementCameraParameter(int param);
void DecrementCameraParameter(int param);
void Run();
static DWORD WINAPI CaptureThread(LPVOID instance);
};
我的 Qt 应用程序(尚未清理)
#include "qtdevc.h"
#include <QtGui>
#include <QDebug>
#include <QtGui/QApplication>
#include "stdafx.h"
#include "CLEyeCameraCapture.h"
using namespace std;
qtDEVC::qtDEVC(QWidget *parent, Qt::WFlags flags)
: QMainWindow(parent, flags)
{
ui.setupUi(this);
connect (ui.pushButton_startCam, SIGNAL( clicked() ),this,SLOT( startCam() ) );
connect (ui.pushButton_quit, SIGNAL( clicked() ),this,SLOT( quit() ) );
connect (ui.pushButton_stopCam, SIGNAL ( clicked() ),this,SLOT( stopCam() ) );
}
qtDEVC::~qtDEVC()
{
}
//get ID of participant
int qtDEVC::startCam()
{
//qt part
//ui.startCam->setText("Hi!");
QString ID;
//get qString Participant Number
ID = ui.lineEditID->text();
//convert to standard string
std::string IDString = ID.toLocal8Bit().constData();
//qDebug()<<ID;
ui.lineEditID->setDisabled(true);
ui.pushButton_startCam->setDisabled(true);
//moved this to here from main
CLEyeCameraCapture *cam[2] = { NULL };
srand(GetTickCount());
// Query for number of connected cameras
...
编辑
包括
"#include " before "#include " in qDEVC.h
解决了编译中语法错误的问题,但现在我得到错误 C2146,C3210和 C2602尝试实例化时
CLEyeCameraCapture::CLeyeCameraCapture cam;
什么是正确的方法?
CLEyeCameraCapture::CLeyeCameraCapture *cam[2]; ??
最佳答案
要修复编译错误,
Please Include "#include <stdafx.h>" before "#include <CLEyeCameraCapture.h>" in qDEVC.h.
了解更多信息 Compiler Error C2146
规则:最佳做法是首先包含标准 header ,然后是您自己的 header 。 C++ Header order
关于c++ - 在另一个类中实例化一个类,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18461687/