库函数

[woshigaowei5146]

用Labview开发海康威视的SDK时，遇到需要图像叠加，提供的函数是：NET_DVR_RigisterDrawFun，这个函数中有个参数是回调函数：

用库函数调用DLL，并且添加回调函数进行图像叠加，请问怎么使用库函数中的回调呢？

[zou]

LabVIEW 中不能调用 callback 函数.

一般先用其它语言编成 dll, 然后给 LabVIEW 用.

[zou]

百度上有许多搜索结果:

http://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&tn=baidu&wd=%E6%B5%B7%E5%BA%B7%E5%A8%81%E8%A7...

[constructionworker]

We are trying to create hikvision SDK in labview We partially succeeded in reading the video and we are doing the checks, but we have a problem we want to use the video with labview IMAQ(NI-Vision library). We get the image with NET_DVR_RealPlay'', but to use the image with labview image display, we need to use ''NET_DVR_RealPlay_V40''. This function needs callback function. For this callback function, a ''dll'' with callback function compiled in c++ is required .I couldn't manage to create it.

Can anyone help with this?

[zou]

This post might be useful for you:

https://lavag.org/topic/22531-using-the-dll-files-of-an-application-compiled-with-c-with-labview/pag...

[constructionworker]

The discussion you suggested has the same problem. A wrapper dll must be created for the callback. I don't know how to create it. I need help from someone with Labview and C knowledge on this. Can anyone help with this?

[zou]

Those LabVIEW users helping OP are the best you can get in the community.

[constructionworker]

Thanks for your suggestion