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POC#/C++ pInvoke tips
 

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    <p>Whats the best way to go about modifying a C++ program to be used with pInvoke from C#.NET CF?</p> <p>I have a large C++ codebase which makes extensive use of STL. Namely iterators, container classes, and standard strings.</p> <p>On top of this many lightweight classes are passed around by value.</p> <p>I want to build a C# gui ontop of this codebase for windows mobile touch devices.</p> <p>Is it worth it?</p> <p>I have managed to get some examples working using pInvoke to call C++ code from C#.NET, but writing wrappers for every access point and for all the STL return types seems very daunting and ugly. Is there another way or am I somewhat stuffed?</p> <p>BTW. Managed C++ is not an option becuase its not supported in any form by .NET CF.</p> <p>--edit: I have one specific question in regards to pinvoke.</p> <p>Suppose you had a function returning a C++ string by value</p> <pre><code>std::string foo () { return std::string ("Hi"); } </code></pre> <p>I understand that its not possible to call this function from C# using pinvoke because there is no way to marshall the STL string, but my problem is that I cannot even write a wrapper without allocating a new array becuase the std::string returned is not on the heap.</p> <pre><code>char* foo2 () { return foo().c_str(); //Very bad //the returned pointer is released when the std::string falls out of scope. //and will be invalid before the caller is able to do anything with it. } </code></pre> <p>So my problem is, how to wrap foo into a pInvoke suitable format without needing to re-allocate the whole string.</p> <pre><code>char* foo2 () { std::string f = foo(); char* waste = new char[f.length()+1]; strcpy (waste, f.c_str()); return f; } </code></pre> <p>The thought of doing the above for every point at which I need to return a std::string is enough to make me give up trying to use C#.</p>
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