Undefined reference to vtable in Hello World App

beginners
#1

Hello,

This is my first time working with OF, and I’m attempting to follow the HelloWorld example on this pdf:

http://www.doc.gold.ac.uk/~ma501ed/Open%20Frameworks.pdf

I’ve followed the example, but when I build my project I get this "undefined reference to vtable error:

||Warning: .drectve `-defaultlib:LIBCMT ' unrecognized| ||Warning: .drectve `-defaultlib:OLDNAMES ' unrecognized| ||Warning: .drectve `/DEFAULTLIB:"LIBCMT" /DEFAULTLIB:"OLDNAMES" ' unrecognized| obj\Release\src\main.o:main.cpp:(.text.startup+0x82)||undefined reference to `vtable for HelloWorldApp'| obj\Release\src\main.o:main.cpp:(.text.startup+0x89)||undefined reference to `vtable for HelloWorldApp'| ||=== Build finished: 2 errors, 17 warnings (0 minutes, 1 seconds) ===|

Any thoughts on what this could be?

Much thanks!

#2

This is my code:

  //HelloWorldApp.h//

 #ifndef _HELLO_WORLD
 #define _HELLO_WORLD

 #include "ofMain.h" //include oF's ofMain class, linked here

 class HelloWorldApp : public ofBaseApp{

 public:
     void setup();//we need this to load the font
     void draw();//we need this to draw the font to the screen

     ofTrueTypeFont franklin;//the font we will load
 };

 #endif // HELLOWORLDAPP_H_INCLUDED

 //HelloWorldApp.cpp//

 #include "HelloWorldApp.h"

 void HelloWorldApp::setup()
 {
     //load out font and give it a name
     franklin.loadFont("frabk.ttf",32);
     ofBackground(255,255,255);
 }

 void HelloWorldApp::draw()
 {
     ofSetColor(0,0,0);
     franklin.drawString("Hello World!",100,380);//experiment
 }

 //main.cpp//

 #include "ofMain.h"
 #include "HelloWorldApp.h"

 //========================================================================
 int main( ){

     //ofAppGlutWindow window:
 	ofSetupOpenGL(300,368, OF_WINDOW);	//experiment with sizes
                                         // <-------- setup the GL context

 	// this kicks off the running of my app
 	// can be OF_WINDOW or OF_FULLSCREEN
 	// pass in width and height too:
 	ofRunApp(new HelloWorldApp());

 }
#3

I honestly default to using the project generator for new apps since it handles all the setup. Have you tried running any of the examples and gotten the same error?

#4

I’ve run some examples, and I don’t get any error.

#5

I tried using the project generator, and it works now :smiley:

thanks for the tip!

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