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POAccess violation on run function from dll
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  1. POAccess violation on run function from dll
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    copied!<p>I have DLL, interface on C++ for work with he. In bcb, msvc it works fine. I want to use Python-scripts to access function in this library. Generate python-package using Swig.</p> <p>File <em>setup.py</em></p> <pre><code> import distutils from distutils.core import setup, Extension setup(name = "DCM", version = "1.3.2", ext_modules = [Extension("_dcm", ["dcm.i"], swig_opts=["-c++","-D__stdcall"])], y_modules = ['dcm']) </code></pre> <p>file <em>dcm.i</em></p> <pre><code>%module dcm %include &lt;windows.i&gt; %{ #include &lt;windows.h&gt; #include "../interface/DcmInterface.h" #include "../interface/DcmFactory.h" #include "../interface/DcmEnumerations.h" %} %include "../interface/DcmEnumerations.h" %include "../interface/DcmInterface.h" %include "../interface/DcmFactory.h" </code></pre> <p>run these command (python is associated with extension .py)</p> <pre><code>setup build setup install </code></pre> <p>using this DLL</p> <pre><code>import dcm f = dcm.Factory() #ok r = f.getRegistrationMessage() #ok print "r.GetLength() ", r.GetLength() #ok r.SetLength(0) #access violation </code></pre> <p>On last string I get access violation. And I have access violation on every function using input parameters.</p> <p><em>DcmInterface.h</em> (interface)</p> <pre><code>class IRegistrationMessage { public: ... virtual int GetLength() const = 0; virtual void SetLength(int value) = 0; ... }; </code></pre> <p><em>uRegistrationMessage.cpp</em> (implementation in DLL)</p> <pre><code>class TRegistrationMessage : public IRegistrationMessage { public: ... virtual int GetLength() const { return FLength; } virtual void SetLength(int Value) { FLength = Value; FLengthExists = true; } ... }; </code></pre> <p>Factory</p> <p><em>DcmFactory.h</em> (using DLL in client code)</p> <pre><code>class Factory { private: GetRegistrationMessageFnc GetRegistration; bool loadLibrary(const char *dllFileName = "dcmDLL.dll" ) { ... hDLL = LoadLibrary(dllFileName); if (!hDLL) return false; ... GetRegistration = (GetRegistrationMessageFnc) GetProcAddress( hDLL, "getRegistration" ); ... } public: Factory(const char* dllFileName = "dcmDLL.dll") { loadLibrary(dllFileName); } IRegistrationMessage* getRegistrationMessage() { if(!GetRegistration) return 0; return GetRegistration(); }; }; </code></pre>
 

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