2

很长一段时间以来,我一直在尝试检索相机上拍摄的图像。我可以使用 SDK 拍照:

错误 = EDSDK.EdsSendCommand(cameraDev, EDSDK.CameraCommand_TakePicture, 0);

我在打开有效的相机会话后执行此操作。我还添加了一个

objectEventHandler 和 stateEventHandler 用于如下所示的事件:

    public static uint stateEventHandler(uint inEvent, uint inParameter, IntPtr inContext)
    {
        switch (inEvent)
        {
            case EDSDK.StateEvent_JobStatusChanged:
                Debug.WriteLine(String.Format("There are objects waiting to be transferred.  Job status {0}", inParameter));
                break;

            case EDSDK.StateEvent_ShutDownTimerUpdate:
                if (inParameter != 0)
                    Debug.WriteLine(String.Format("shutdown timer update: {0}", inParameter));
                break;

            default:
                Debug.WriteLine(String.Format("StateEventHandler: event {0}, parameter {1}", inEvent, inParameter));
                break;
        }
        return 0;
    }

    public static uint objectEventHandler(uint inEvent, IntPtr inRef, IntPtr inContext)
    {
        switch (inEvent)
        {
            case EDSDK.ObjectEvent_VolumeInfoChanged:
                Debug.WriteLine("volume info changed");

                #region retrieve volume info

                EDSDK.EdsVolumeInfo volumeInfo;
                err = EDSDK.EdsGetVolumeInfo(inRef, out volumeInfo);
                if (err == EDSDK.EDS_ERR_OK)
                {
                    switch (volumeInfo.StorageType)
                    {
                        case (uint)EDSDK.EdsStorageType.Non:
                            Debug.WriteLine("No card inserted");
                            break;
                        default:
                        case (uint)EDSDK.EdsStorageType.CF:
                        case (uint)EDSDK.EdsStorageType.SD:
                            if (volumeInfo.Access == (uint)EDSDK.EdsAccess.ReadWrite)
                            {
                                Debug.WriteLine(String.Format("Label: {0}, Max Capacity: {1}, Free Space: {2}",
                                    volumeInfo.szVolumeLabel, volumeInfo.MaxCapacity, volumeInfo.FreeSpaceInBytes));

                                /*
                                err = EDSDK.EdsGetChildAtIndex(volumeInfo, 0, directoryList);
                                if (err != EDSDK.EDS_ERR_OK)
                                    throw new Exception(String.Format("EdsGetChildAtIndex: " + err.ToString()));
                                */
                            }
                            else
                                Debug.WriteLine(String.Format("Volume access rights: {0}", volumeInfo.Access));
                            break;
                    }
                }

                #endregion retrieve volume info

                break;

            case EDSDK.ObjectEvent_DirItemCreated:
                downloadImage(inContext);
                Debug.WriteLine("dir item created");
                break;

            default:
                Debug.WriteLine(String.Format("ObjectEventHandler: event {0}", inEvent));
                break;
        }
        return 0;
    }

我尝试了多种方法(检索此图像),它们似乎都不起作用。一些方法是:

http://tech.groups.yahoo.com/group/CanonSDK/message/1575

[http://stackoverflow.com/questions/3762530/take-picture-and-directly-save-image-to-pc-using-edsdk-2-8]

[http://canonsdk.com/phpBB3/viewtopic.php?f=7&t=94&sid=7fcbe7ad6eadb399dbcb4b61a7333112]

问题是它们都只是代码的一部分,当我尝试将它放入我的代码时,它永远无法正常工作。可能是因为我不是 memoryStreams 方面的专家,所以指针如此。我得到的大多数错误是在读取流并将它们复制到本地缓冲区时,它说流是空的。

有没有人有完整的示例代码来拍照并将其下载到磁盘(或内存),或者我需要的正确方法来完成这个?

谢谢费尔南多

4

2 回答 2

1

您的代码中的错误是:

downloadImage(inContext);

它应该是

 downloadImage(inRef);
于 2012-09-27T01:39:54.477 回答
0

将捕获的图像作为文件下载到硬盘中,您可以查看它

void DownloadImage(IntPtr DirectoryRef)
{
    IntPtr stream = IntPtr.Zero;

    try
    {
        Error = EDSDK.EdsGetDirectoryItemInfo(DirectoryRef, out dirItemInfo);

        if (Error == OK)
        {
            Error = EDSDK.EdsCreateFileStream(dirItemInfo.szFileName,
            EDSDK.EdsFileCreateDisposition.CreateAlways, EDSDK.EdsAccess.ReadWrite, out stream);
        }

        if (Error == OK)
        {
            Error = EDSDK.EdsDownload(DirectoryRef, dirItemInfo.Size, stream);
        }

        if (Error == OK)
        {
            Error = EDSDK.EdsDownloadComplete(DirectoryRef);
        }
        else
        {
            Error = EDSDK.EdsDownloadCancel(DirectoryRef);
        }

        Error = EDSDK.EdsGetPointer(stream, out data);
        if (Error != OK)
                throw new Exception("Invalid Pointer Handler. Error Code:" + err.getErrorName(Error) + "(" + Error + ")" );

        Error = EDSDK.EdsGetLength(stream, out size);

        Bitmap retImage = null;
   }
   catch (Exception ex)
   {

   }

   EDSDK.EdsRelease(stream);
   EDSDK.EdsRelease(data);            
}
于 2012-04-11T06:30:45.797 回答