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POAvoiding a static member function in c++ when using a callback interface from C
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  1. POAvoiding a static member function in c++ when using a callback interface from C
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    copied!<p>I would like to access the data within this member function that is static. Right now the member function is static so that I can use it with a third party API written in C that has typdef function pointer for callback purposes. Based on the info below, what is the best way to get around the need to create a static function in order to use the data from the following function member within other member functions of my class that are non-static. Maybe there is a way to still use this static function but still overcome the inability to mix static with non-static variables. My code does works as is but with no ability to access the data in the following callback function.</p> <pre><code>void TextDetect::vtrCB(vtrTextTrack *track, void *calldata) /*acts as a callback*/ { /*specifically would like to take data from "track" to a deep copy so that I don't loose scope over the data withing that struct */ } </code></pre> <p>In an associated API written in C, there are the following two lines of code that I am forced to use:</p> <pre><code> typedef void (*vtrCallback)(vtrTextTrack *track, void *calldata); int vtrInitialize(const char *inifile, vtrCallback cb, void *calldata); </code></pre> <p>Here is the header of my class:</p> <pre><code> #include &lt;vtrapi.h&gt; #include &lt;opencv.hpp&gt; class TextDetect { const char * inifile; vtrImage *vtrimage; int framecount; public: TextDetect(); ~TextDetect(); static void vtrCB(vtrTextTrack *track, void *calldata); int vtrTest(cv::Mat); bool DrawBox(cv::Mat&amp;); }; TextDetect::TextDetect() : inifile("vtr.ini") { if (vtrInitialize(inifile, vtrCB /*run into problems here*/, NULL) == -1) std::cout &lt;&lt; "Error: Failure to initialize" &lt;&lt; std::endl; vtrimage = new vtrImage; framecount = 0; } void TextDetect::vtrCB(vtrTextTrack *track, void *calldata) /*acts as a callback*/ { /*specifically would like to take data from "track" to a deep copy so that I don't loose scope over the data withing that struct */ } </code></pre>
 

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