是否可以使用EDSDK更改视频和照片模式？

Question

我可以在电影拍摄模式下录制视频（第6.4.3节EDSDK API），但我需要逐步录制视频并拍摄照片。所以我有一个问题：是否可以使用sdk更改视频和照片模式？如果是，我们应该在相机上安装哪种模式？如何使用SDK做到这一点？我们的相机型号是佳能eos 650D。在第6.4.2节EDSDK API中，我读取了在视频录制之前使用实时查看模式，但它的解决方案并不起作用。我尝试使用下面的代码。

#include <QCoreApplication>

#include "EDSDK/Header/EDSDK.h"
#include <Windows.h>
#include <QDebug>


EdsError startLiveview(EdsCameraRef camera)
{
EdsError err = EDS_ERR_OK;

// Get the output device for the live view image
EdsUInt32 device;
err = EdsGetPropertyData(camera, kEdsPropID_Evf_OutputDevice,  0 ,  sizeof(device), &device );

// PC live view starts by setting the PC as the output device for the live view image.
if(err == EDS_ERR_OK)
{
  device |= kEdsEvfOutputDevice_PC;

  err = EdsSetPropertyData(camera, kEdsPropID_Evf_OutputDevice, 0 , sizeof(device), &device);
}

return err;
// A property change event notification is issued from the camera if property settings are made successfully.
// Start downloading of the live view image once the property change notification arrives.
}

EdsError endLiveview(EdsCameraRef camera)
{
EdsError err = EDS_ERR_OK;

// Get the output device for the live view image
EdsUInt32 device;
err = EdsGetPropertyData(camera, kEdsPropID_Evf_OutputDevice,    0 ,  sizeof(device), &device );

// PC live view ends if the PC is disconnected from the live view image output device.
if(err == EDS_ERR_OK)
{
  device &= ~kEdsEvfOutputDevice_PC;

  err = EdsSetPropertyData(camera, kEdsPropID_Evf_OutputDevice, 0 , sizeof(device), &device);
}
return err;
}


int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);


    EdsError err = EDS_ERR_OK;
    EdsCameraRef  camera = NULL;
     EdsCameraListRef  cameraList = NULL;
    bool isSDKLoaded = false;
     EdsUInt32  count = 0;


    err = EdsInitializeSDK();

    if(err == EDS_ERR_OK)
    {
       isSDKLoaded=true ;
    }

    err = EdsGetCameraList(&cameraList);


// Get number of cameras
    if(err== EDS_ERR_OK)
    {
       err = EdsGetChildCount(cameraList,    &count);


   if(count == 0)
      {
         err = EDS_ERR_DEVICE_NOT_FOUND;
      }
    }
     // Get first camera retrieved
   if(err == EDS_ERR_OK)
    {
       err = EdsGetChildAtIndex(cameraList ,    0 ,   &camera);
    }


    if(err == EDS_ERR_OK)
    {
    err = EdsOpenSession(camera);
    }


    EdsUInt32 saveTo = kEdsSaveTo_Camera;
    err = EdsSetPropertyData(camera, kEdsPropID_SaveTo, 0, sizeof(saveTo) , &saveTo);



    startLiveview(camera);
    Sleep(1000);

    EdsUInt32 record_start = 4; // Begin movie shooting
    err = EdsSetPropertyData(camera, kEdsPropID_Record, 0, sizeof(record_start), &record_start);
    qDebug() << err;

    Sleep(3000);

    EdsUInt32 record_stop = 0; // End movie shooting
    err = EdsSetPropertyData(camera, kEdsPropID_Record, 0, sizeof(record_stop), &record_stop);
    qDebug() << err;

    endLiveview(camera);
       Sleep(1000);

    // Close session with camera
    if(err == EDS_ERR_OK)
    {
    err = EdsCloseSession(camera);
    }

    // Release camera
    if(camera != NULL)
    {
     EdsRelease(camera);
    }

    // Terminate SDK
    if(isSDKLoaded)
    {
     EdsTerminateSDK();
    }

    return a.exec();
}