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PORun-time error caused by wrong calling convention
 

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  1. PORun-time error caused by wrong calling convention
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    <p>I have the following class definition:</p> <pre><code>class IRenderable { public: virtual void Render( wxBitmap * ) = 0; } class MyClass : public wxWindow, public IRenderable { public: /* costructor, destructor etc... */ void RenderBitmap( wxBitmap *bitmap ) { // code } } </code></pre> <p>where wxWindow and wxBitmap are classes belonging to wxWidgets library (a C++ portable library for writing GUI applications).</p> <p>I am using Visual C. The following piece of code is wrong:</p> <pre><code>MyClass *c = new MyClass(...); wxWindow *w = (wxWindow *)c; IRenderable *r_page = (IRenderable *)w; // bitmap is allocate somewhere else r_page-&gt;RenderBitmap( bitmap ); </code></pre> <p>because i get a runtime error:</p> <blockquote> <p>Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.</p> </blockquote> <p>What's going on? </p> <p>What i am doing is the following. A third-party library (wxAUI) get pointers to wxWindow in order to manage them. I have sublcassed wxWindow (MyClass) to add some specific code. So, instead of managing wxWindows objects i am using MyClass objects. In some situations, i ask wxAUI to return me the wxWindow pointer of the "current" window, which should be a pointer to MyClass object. I want to call the RenderBitmap() method on those objects, so i need to cast it to IRenderable, but get that run-time error...</p> <p>I do not have RTTI enable and don't now if this would solve the problem...</p>
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