如何从OpenCV中的XML字符串中读取？ [英] How can I read from an XML-string in OpenCV?

问题描述

我知道如何将 cv :: Mat 实例加载/保存到XML文件中（请参阅 this question ）。

但我真正需要的是解析一个 std :: string （或 char * ）包含XML，并获得 cv :: Mat 。说我从数据库中获取XML，而不是从文件中获取。

这是否可能？

这是一个来自发布说明：

  // ==== stored data ==== 
 FileStorage fs（。xml，FileStorage :: WRITE + FileStorage :: MEMORY）; 
 fs<< date<< date_string<< mymatrix< mymatrix; 
 string buf = fs.releaseAndGetString（）; 
 
 // ==== read it back ==== 
 FileStorage fs（buf，FileStorage :: READ + FileStorage :: MEMORY）; 
 fs [date]>> date_string; 
 fs [mymatrix]>> mymatrix; 
  

I know how to load/save a cv::Mat instance into a XML-file (See this question).

But what I really need, is to parse a std::string (or char *) that contains the XML, and get the cv::Mat. Say I get the XML out of a database, and not from a file.

Is that possible?

解决方案

You can do it since OpenCV 2.4.1.

Here is a code sample from release notes:

//==== storing data ====
FileStorage fs(".xml", FileStorage::WRITE + FileStorage::MEMORY);
fs << "date" << date_string << "mymatrix" << mymatrix;
string buf = fs.releaseAndGetString();

//==== reading it back ====
FileStorage fs(buf, FileStorage::READ + FileStorage::MEMORY);
fs["date"] >> date_string;
fs["mymatrix"] >> mymatrix;

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