I am trying to write a program to take picture by Canon EOS700D and change the image name, and also save that image to the certain directory. but I don know why it doesn't work!the Error is EDS_ERR_TAKE_PICTURE_CARD_NG. this is my object event handler function:
EdsError EDSCALLBACK SDKObjectEventHandler( EdsObjectEvent event, EdsImageRef object,
EdsVoid * context)
{
switch(event)
{
case kEdsObjectEvent_All:
break;
case kEdsObjectEvent_DirItemCancelTransferDT:
break;
case kEdsObjectEvent_DirItemContentChanged:
break;
case kEdsObjectEvent_DirItemCreated:
break;
case kEdsObjectEvent_DirItemInfoChanged:
break;
case kEdsObjectEvent_DirItemRemoved:
break;
case kEdsObjectEvent_DirItemRequestTransfer:
DownloadImage(object, ImageSaveDirectory);
break;
case kEdsObjectEvent_DirItemRequestTransferDT:
break;
case kEdsObjectEvent_FolderUpdateItems:
break;
case kEdsObjectEvent_VolumeAdded:
break;
case kEdsObjectEvent_VolumeInfoChanged:
break;
case kEdsObjectEvent_VolumeRemoved:
break;
case kEdsObjectEvent_VolumeUpdateItems:
break;
}
// Object must be released
if(object)
{
EdsRelease(object);
}
return EDS_ERR_OK;
}
and my open session:
EdsError OpenSession(EdsCameraRef NewCamera)
{
//CamRef = NewCamera;
if (CameraSessionOpen) EdsCloseSession(NewCamera);
if (NewCamera != NULL)
{
//open a session
Error = EdsOpenSession(NewCamera);
//subscribe to the camera events (this time, in-Camera)
Error = EdsSetObjectEventHandler(NewCamera, kEdsObjectEvent_All, SDKObjectEventHandler, NULL);
Error = EdsSetPropertyEventHandler(NewCamera, kEdsPropertyEvent_All, SDKPropertyEventHandler, NULL);
Error = EdsSetCameraStateEventHandler(NewCamera,kEdsStateEvent_All, SDKStateEventHandler,NULL);
CameraSessionOpen = true;
}
return Error;
}
and the download image:
EdsError DownloadImage(EdsDirectoryItemRef DirItemRef,string Sdirectory )
{
EdsDirectoryItemInfo dirInfo;
EdsStreamRef StreamRef;
//get information about object
Error = EdsGetDirectoryItemInfo(DirItemRef, &dirInfo);
if (Error != EDS_ERR_OK)
cout<< "SDK Error: " << Error << endl;
System::String^ CurrentPhoto2;
string extention = ".CR2" ;
System::String^ extention2 = gcnew System::String(extention.c_str());
System::Console::WriteLine(extention2);
System::String^ directory2 = gcnew System::String(Sdirectory.c_str());
System::Console::WriteLine(directory2);
if (ImageName!= 0 )
{
System::String^ ImageName2 = gcnew System::String(ImageName/*.c_str()*/);
System::Console::WriteLine(ImageName2);
CurrentPhoto2 = Path::Combine(directory2 , ImageName2 , extention2);
}
else
{
System::String^ FileName2 = gcnew System::String(dirInfo.szFileName);
System::Console::WriteLine(FileName2);
CurrentPhoto2 = Path::Combine(directory2,FileName2);
}
EdsChar* CurrentPhoto = (char*)System::Runtime::InteropServices::Marshal::StringToHGlobalAnsi(CurrentPhoto2).ToPointer();
System::Runtime::InteropServices::Marshal::FreeHGlobal((System::IntPtr) CurrentPhoto);
//create filestream to data
Error = EdsCreateFileStream(CurrentPhoto, kEdsFileCreateDisposition_CreateAlways, kEdsAccess_ReadWrite, &StreamRef);
//download file
Error = DownloadData(DirItemRef, StreamRef);
//release stream
Error = EdsRelease(StreamRef);
return Error;
}
and finally the take photo function:
EdsError TakePhoto(EdsCameraRef NewCamera)
{
int BusyCount = 0;
EdsError mErr = EDS_ERR_OK;
//sometimes the camera is not ready immediately
while (BusyCount < 20)
{
//send command to camera
ImageName = "red" ;
mErr = EdsSendCommand(NewCamera, kEdsCameraCommand_TakePicture, 0);
//if camera is busy, wait and try again
if (mErr == EDS_ERR_DEVICE_BUSY)
{
BusyCount++;
}
if (mErr != EDS_ERR_OK)
cout<< "SDK Error: " << mErr << endl;
}
Error = mErr;
return Error;
}
every thing seems to be correct!! but it doesn't work! :( plz help mee ...
I have solved my problem. this is my correct code:
EdsError DownloadImage(EdsDirectoryItemRef DirItemRef,string Sdirectory ,string Imgname, string exten)
{
EdsDirectoryItemInfo dirInfo;
EdsStreamRef StreamRef;
//get information about object
Error = EdsGetDirectoryItemInfo(DirItemRef, &dirInfo);
if (Error != EDS_ERR_OK)
cout<< "SDK Error: " << Error << endl;
string path;
if ( !ImageName.empty() )
{
path = Sdirectory + "\\" + ImageName + exten;
}
else
{
path = Sdirectory + "\\" + dirInfo.szFileName ;
}
const EdsChar* CurrentPhoto = path.c_str() ;
//create filestream to data
Error = EdsCreateFileStream(CurrentPhoto, kEdsFileCreateDisposition_CreateAlways, kEdsAccess_ReadWrite, &StreamRef);
//download file
Error = DownloadData(DirItemRef, StreamRef);
//release stream
Error = EdsRelease(StreamRef);
return Error;
}
void main(int argc, char **argv)
{
CamRef = NULL;
bool isSDKLoaded = false;
CameraSessionOpen = false;
string ImgeSvDrctry;
string exten;
string Imgname;
EdsDirectoryItemRef DirectoryItemRef = NULL;
EdsInt32 SaveTarget = kEdsSaveTo_Host;
ImageSaveDirectory = "";
MSG msg;
//initial sdk
Error = InitSDK();
// Get first camera
if (Error == EDS_ERR_OK)
{
Error = getFirstCamera ( &CamRef );
if (Error == EDS_ERR_OK)
{
// Open session with camera
Error = OpenSession(CamRef);
if(Error != EDS_ERR_OK)
cout << "session failed" <<Error << endl;
else
{
cout << "session opened" << endl;
Error = DeviceInformation(CamRef);
// Set camera properties
Error = EdsSetPropertyData(CamRef, kEdsPropID_SaveTo , 0, sizeof(SaveTarget), &SaveTarget );
if(Error == EDS_ERR_OK)
{
cout << "camera properties seted!" << endl;
}else
cout << "Unable to set camera properties, SDK Error: " << Error <<endl;
//set capacity
Error = SetCapacity(CamRef);
if (Error == EDS_ERR_OK)
{
std::cout << "capacity seted ! " << std::endl;
cout <<"Enter the image save directory : " ;
cin >> ImgeSvDrctry ;
ImageSaveDirectory = ImgeSvDrctry;
cout <<"Enter the image name : " ;
cin >> Imgname ;
ImageName = Imgname ;
cout <<"Enter the image extention : " ;
cin >> exten ;
extention = exten;
Error = TakePhoto(CamRef);
}
while((GetMessage(&msg, NULL, 0, 0)) != 0)
{
if(GetMessage(&msg, NULL, 0, 0) == -1 || bPhotoTaken)
{
break;
}
else
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
}
// Close session with camera
Error = CloseSession(CamRef);
}else
cout<< "SDK Error: " << Error << endl;
}else
cout<< "SDK Error: " << Error << endl;
// Release camera
if(CamRef != NULL) EdsRelease(CamRef);
// Terminate SDK
Error = TerminateSDK();
return 0;
}