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POCtypes "symbol not found" for dynamic library in OSX
 

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  1. POCtypes "symbol not found" for dynamic library in OSX
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    <p>I have made a C++ library and have built a .dylib dynamic library from it. However when I load it with ctypes, it fails. Something doesn't seem to have linked properly. I have no idea why. The error (The relevant part):</p> <pre><code> cscalelib.setup_framebuffer(flip,surface.frame_buffer,surface.texture,surface._scale[0],surface._scale[1]) File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/ctypes/__init__.py", line 325, in __getattr__ func = self.__getitem__(name) File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/ctypes/__init__.py", line 330, in __getitem__ func = self._FuncPtr((name_or_ordinal, self)) AttributeError: dlsym(0x56ecd0, setup_framebuffer): symbol not found </code></pre> <p>Here's the C++ code which is still in progress but should work with what I have so far.</p> <pre><code>#include &lt;OpenGL/gl.h&gt; #include &lt;OpenGL/glu.h&gt; #include &lt;vector.h&gt; void setup_framebuffer(bool flip,GLuint frame_buffer_id,GLuint texture_id,int width,int height){ glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, frame_buffer_id); glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, texture_id, 0); glPushAttrib(GL_VIEWPORT_BIT); glViewport(0,0,width,height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); //Load the projection matrix if (flip){ gluOrtho2D(0,width,height,0); }else{ gluOrtho2D(0,width,0,height); } } void end_framebuffer(){ glPopAttrib(); glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); glMatrixMode(GL_PROJECTION); glLoadIdentity(); //Load the projection matrix gluOrtho2D(0,1280,720,0); //Set an orthorgraphic view } void add_lines(bool antialias,vector&lt; vector&lt;double&gt; &gt; coordinates,double w,double r,double g, double b,double a){ glDisable(GL_TEXTURE_2D); if (antialias){ glEnable(GL_LINE_SMOOTH); //Enable line smoothing. } glColor4d(r,g,b,a); glLineWidth(w); glBegin(GL_LINE_STRIP); for (int x = 0; x &lt; coordinates.size(); x++) { glVertex2d(coordinates[x][0],coordinates[x][1]); } glEnd(); if (antialias){ glDisable(GL_LINE_SMOOTH); //Disable line smoothing. } glEnable(GL_TEXTURE_2D); } </code></pre> <p>I compiled it with:</p> <p>g++ -dynamiclib CPPEXTSCALELIB.cp -framework opengl -arch i386 -o CPPEXTSCALELIB.dylib</p> <p>Here's the Python code with "..." to represent irrelevant parts.</p> <pre><code>... from ctypes import * ... cscalelib = CDLL(os.path.dirname(sys.argv[0]) + "/CPPEXTSCALELIB.dylib") ... def setup_framebuffer(surface,flip=False): #Create texture if not done already if surface.texture is None: create_texture(surface) #Render child to parent if surface.frame_buffer is None: surface.frame_buffer = glGenFramebuffersEXT(1) cscalelib.setup_framebuffer(flip,surface.frame_buffer,surface.texture,surface._scale[0],surface._scale[1]) ... </code></pre> <p>Thank you.</p>
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