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POc# Canon SDK: No callback after CameraCommand_TakePicture
 

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  1. POc# Canon SDK: No callback after CameraCommand_TakePicture
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    <p>i've been trying to make this work for some time now... read a lot of posts but none of them could fix this issue.</p> <p>I am connecting to a EOS 550D using the Canon SDK. I am running win7 64bit and Visual Studio c# 2010.</p> <p>What I do step by step is:</p> <p>--> 0 Init SDK</p> <pre><code> err = EDSDK.EdsInitializeSDK(); </code></pre> <p>--> 1 Getting camera list</p> <pre><code> err = EDSDK.EdsGetCameraList(out cameraList); </code></pre> <p>--> 2 Getting child count</p> <pre><code> err = EDSDK.EdsGetChildCount(cameraList, out cameraCount); </code></pre> <p>--> 3 If there is a child, get first child</p> <pre><code> err = EDSDK.EdsGetChildAtIndex(cameraList, 0, out cameraDev); </code></pre> <p>--> 4 Opening a session</p> <pre><code>err = EDSDK.EdsOpenSession(cameraDev); </code></pre> <p>--> 5 Telling the sdk to save images locally </p> <pre><code>IntPtr saveTo = (IntPtr)EDSDK.EdsSaveTo.Host; err = EDSDK.EdsSetPropertyData(cameraDev, EDSDK.PropID_SaveTo, 0, 4, saveTo); </code></pre> <p>--> 6 Setting the available capacity on the host machine</p> <pre><code> EDSDK.EdsCapacity capacity = new EDSDK.EdsCapacity(); if (err == EDSDK.EDS_ERR_OK) { capacity.NumberOfFreeClusters = 0x7FFFFFFF; capacity.BytesPerSector = 0x1000; capacity.Reset = 1; err = EDSDK.EdsSetCapacity(cameraDev, capacity); } </code></pre> <p>--> 7 Registring State event Handler</p> <pre><code>err = EDSDK.EdsSetCameraStateEventHandler(cameraDev, EDSDK.StateEvent_All, stateEventHandler, new IntPtr(0)); </code></pre> <p>--> 8 Registring Object Event Handler</p> <pre><code> EDSDK.EdsObjectEventHandler edsObjectEventHandler = new EDSDK.EdsObjectEventHandler(objectEventHandler); err = EDSDK.EdsSetObjectEventHandler(cameraDev, EDSDK.ObjectEvent_All, edsObjectEventHandler, IntPtr.Zero); </code></pre> <p>....</p> <p>I dont get any error while doing this, all seems to be fine.</p> <p>Here are my Handler </p> <pre><code> private uint objectEventHandler(uint inEvent, IntPtr inRef, IntPtr inContext) { Console.WriteLine("HALLLOOOOOOOOOO"); switch (inEvent) { case EDSDK.ObjectEvent_DirItemCreated: //this.invokeNewItemCreatedEvent(new NewItemCreatedEventArgs(getCapturedItem(inRef))); Console.WriteLine("Directory Item Created"); break; case EDSDK.ObjectEvent_DirItemRequestTransfer: Console.WriteLine("Directory Item Requested Transfer"); break; default: Console.WriteLine(String.Format("ObjectEventHandler: event {0}, ref {1}", inEvent.ToString("X"), inRef.ToString())); break; } return 0x0; } public uint stateEventHandler(uint inEvent, uint inParameter, IntPtr inContext) { Console.WriteLine("stateEventHandler " + inEvent); switch (inEvent) { case EDSDK.StateEvent_JobStatusChanged: Console.WriteLine(String.Format("There are objects waiting to be transferred. Job status {0}", inParameter)); break; case EDSDK.StateEvent_ShutDownTimerUpdate: if (inParameter != 0) Console.WriteLine(String.Format("shutdown timer update: {0}", inParameter)); break; case EDSDK.ObjectEvent_DirItemRequestTransfer: //WHAT I NEED!!! Console.WriteLine("Hallo DirItemRequestTransfer"); //DownloadImage(obj); break; default: Console.WriteLine(String.Format("StateEventHandler: event {0}, parameter {1}", inEvent, inParameter)); break; } return 0; } </code></pre> <p>...</p> <p>So now my problem is that none of the handler is ever called. Don't know why, I searche the net fpr quite some time, tried different approaches but did not get the callback...</p> <p>Here is my method calling the take picture command:</p> <pre><code> public void takePic() { if (cameraOpened) { Console.WriteLine( "taking a shot"); err = EDSDK.EdsSendCommand(cameraDev, EDSDK.CameraCommand_TakePicture, 0); if (err != EDSDK.EDS_ERR_OK) Console.WriteLine("TakeCommand Error: " + err.ToString()); Console.WriteLine("Finished taking a shot"); } } </code></pre> <p>Maybe someone has an idea what I could try to make this work?</p> <p>Thanks in advance!</p> <p>Best regards, Tobias</p>
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