I'm programming tethering for the canon camera in Qt under Mac OSX and for some reason my handlers for sdk are not called. When I want to shoot with camera it's all goes well but my photo is not downloaded because EdsSetObjectEventHandler is not called.
BUT for some reason when I shoot with camera and after that I restart the application then one photo is downloaded. My opinion is I need to use their event loop, but I don't know how.
My application don't freeze only handler is not called. I can take many photos (but only to camera cache).
Here is my code.
Initialization method
void CameraControl::initEDS()
{
Q_D(CameraControl);
// Camera init
EdsUInt32 count = 0;
EdsDeviceInfo info;
EdsError err = EdsInitializeSDK();
if(err != EDS_ERR_OK)
qFatal("Error: Could not initialize library!");
EdsCameraListRef cameraList = NULL;
if(EdsGetCameraList(&cameraList) != EDS_ERR_OK)
qFatal("Error: Could not get camera list!");
if(EdsGetChildCount(cameraList, &count) != EDS_ERR_OK)
qFatal("Error: Could not get number of cameras!");
if(EdsGetChildAtIndex(cameraList, 0, &(d->m_camera)) != EDS_ERR_OK)
qFatal("Error: Could not get camera!");
if(EdsGetDeviceInfo(d->m_camera, &info) != EDS_ERR_OK)
qFatal("Error: Could not get camera info!");
EdsRelease(cameraList);
// Register handler - this are not called
if(EdsSetObjectEventHandler(d->m_camera, kEdsObjectEvent_All, handleObjectEvent, (EdsVoid*)this) != EDS_ERR_OK)
{
qFatal("Error: can't setup object handler");
}
if(info.deviceSubType == 0)
d->m_isLegacy = true;
else
d->m_isLegacy = false;
// open session
if(EdsOpenSession(d->m_camera) != EDS_ERR_OK)
qFatal("Can't open session with camera");
sleep(1);
EdsUInt32 saveTo = kEdsSaveTo_Host;
if(EdsSetPropertyData(d->m_camera, kEdsPropID_SaveTo, 0, sizeof(saveTo), &saveTo) != EDS_ERR_OK)
qFatal("Error: can't get property for saveTo");
if(!d->m_isLegacy)
{
EdsCapacity capacity = {0x7FFFFFFF, 0x1000, 1};
if(EdsSetCapacity(d->m_camera, capacity) != EDS_ERR_OK)
qFatal("Error: can't set capacity");
}
// get property camera name
EdsUInt32 dataSize = 0;
EdsDataType dataType = kEdsDataType_Unknown;
EdsChar dataString[EDS_MAX_NAME];
if(EdsGetPropertySize(d->m_camera, kEdsPropID_ProductName, 0, &dataType, &dataSize) != EDS_ERR_OK)
qFatal("Can't get property size");
if(dataType == kEdsDataType_String)
{
qDebug() << "property is string";
if(EdsGetPropertyData(d->m_camera, kEdsPropID_ProductName, 0, dataSize, &dataString) != EDS_ERR_OK)
qFatal("Can't get product name of camera");
}
}
Capture method
void CameraControl::capture()
{
Q_D(CameraControl);
EdsError err;
if((err = EdsSendCommand(d->m_camera, kEdsCameraCommand_TakePicture, 0)) != EDS_ERR_OK)
{
QString str = QString("Error: can't shoot with camera - code: %1").arg(QString::number(err, 16));
qDebug() << str;
}
else
qDebug() << "picture taken";
}
Handler method
EdsError EDSCALLBACK handleObjectEvent(EdsUInt32 inEvent, EdsBaseRef inRef, EdsVoid* inContext)
{
EdsError err = EDS_ERR_OK;
CameraControl* control = static_cast<CameraControl*>(inContext);
qDebug() << "object handler called"; // never called
switch(inEvent)
{
case kEdsObjectEvent_DirItemRequestTransfer:
download(inRef, control); // download photo
default:
EdsRelease(inRef);
}
return EDS_ERR_OK;
}
Anyone know why this happening? Thank you for your help.