Developing a Video Monitoring System Documentary 10 memory failures during video recording

Previously, the delegate is converted into an internal variable of a method. The result is recorded as follows:

For "WindowsApplication1! Pixysoft. HikVision. STREAM_DIRECT_READ_CALLBACK: Invoke "type of garbage collection delegate for callback. This may cause application crash, damage, and data loss. When delivering delegates to unmanaged code, managed applications must keep these delegates active until you are sure they will not be called again.

 

After being recorded as an external domain video for more than 10 seconds, the system prompts: Try to read or write the protected memory. This usually indicates that other memory is damaged.

 

It is estimated that the memory is released...

 

The following is a summary of delegate. References:

Http://msdn.microsoft.com/zh-cn/library/43yky316 (VS.80). aspx

Http://topic.csdn.net/u/20080423/03/43b58852-5cac-4aac-a7da-6a69e69b21cd.html

 

Reference:

Http://msdn.microsoft.com/zh-cn/library/system.gc.keepalive.aspx

Http://www.tech-archive.net/Archive/DotNet/microsoft.public.dotnet.languages.csharp/2006-09/msg01380.html

Http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/d12c13a6-f103-48c8-9933-291a1685941a/

Http://blog.csdn.net/fanweiwei/archive/2007/09/11/1780742.aspx

Http://social.msdn.microsoft.com/Forums/en-US/clr/thread/66ea26a6-7c3d-4e96-9336-e3f148659f22/

Http://topic.csdn.net/u/20080423/03/43b58852-5cac-4aac-a7da-6a69e69b21cd.html

Keyword: GC, CALLBACK, DELEGATE, DLLIMPORT

 

The problem is solved. Is an interface declaration problem:

 

Incorrect statement:

Public delegate int StreamDirectReadCallback (int channelNumber, [financialas (UnmanagedType. LPArray, SizeConst = 704*576*5)] byte [] DataBuf, uint Length, Pixysoft. hikVision. DS40xxSDK. frameType_t FrameType, System. intPtr context );

 

Correct statement:

Public delegate int StreamDirectReadCallback (int channelNumber, IntPtr DataBuf, uint Length, Pixysoft. HikVision. DS40xxSDK. FrameType_t FrameType, System. IntPtr context );