DLL compiling (GL2PS)

Hello,

I have found a library that I want to include in my program. I am a Pascal programmer and the library in written in C. It is GL2PS, to convert OpenGL drawings into images (EPS, PDF, SVG, ....).

I am not familiar with C programming but would like to have the library. The library can be compiled to a windows dll as stated on the website. I have asked if they have the library (.dll) available, but it is not. No one has reacted to my question if I could download it anywhere and I can't seem to find it anywhere on the internet.

I have downloaded Visual Studio 2010 Express to see if I could compile it myself. But it gives me all kind of errors and I am not able to fix them. So I was wondering if anyone out here might be able to compile the file for me so I could use it in my program.

Thanks in advance, you'll make me very happy (since I am trying to get the dll for over 2 weeks now already and still no luck).

Can you post some of the errors?

1>------ Build started: Project: GL2PS, Configuration: Debug Win32 ------
1> gl2ps.c
1>gl2ps.c(3406): error C2065: 'M_PI' : undeclared identifier
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Fixed the M_PI with:
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

Now I get:

1>gl2ps.c(3410): warning C4244: '=' : conversion from 'double' to 'GLfloat', possible loss of data
1>gl2ps.obj : error LNK2019: unresolved external symbol __imp__glGetIntegerv@8 referenced in function _gl2psPrintPostScriptBeginViewport
1>gl2ps.obj : error LNK2019: unresolved external symbol __imp__glGetFloatv@8 referenced in function _gl2psPrintPostScriptBeginViewport
1>gl2ps.obj : error LNK2019: unresolved external symbol __imp__glRenderMode@4 referenced in function _gl2psPrintPostScriptBeginViewport
1>gl2ps.obj : error LNK2019: unresolved external symbol __imp__glFeedbackBuffer@12 referenced in function _gl2psBeginPage
1>gl2ps.obj : error LNK2019: unresolved external symbol __imp__glIsEnabled@4 referenced in function _gl2psBeginPage
1>gl2ps.obj : error LNK2019: unresolved external symbol __imp__glPassThrough@4 referenced in function _gl2psAddText
1>gl2ps.obj : error LNK2019: unresolved external symbol __imp__glGetBooleanv@8 referenced in function _gl2psAddText
1>gl2ps.obj : error LNK2019: unresolved external symbol __imp__glEnd@0 referenced in function _gl2psDrawImageMap
1>gl2ps.obj : error LNK2019: unresolved external symbol __imp__glVertex3f@12 referenced in function _gl2psDrawImageMap
1>gl2ps.obj : error LNK2019: unresolved external symbol __imp__glBegin@4 referenced in function _gl2psDrawImageMap
1>C:\Users\Jarry\Desktop\gl2ps\gl2ps-1.3.5-source\Debug\GL2PS.dll : fatal error LNK1120: 10 unresolved externals

that seem like external files?

Try open the gl2ps.h and paste this towards the top:

Code:

---

#ifndef M_PI
#define M_PI          3.14159265358979323846
#endif
#pragma comment(lib, "OpenGL32.Lib")
#pragma warning(disable:4244)
#pragma warning(disable:4267)

---

The first part adds the definition of M_PI. Then you need to add the library for opengl (that's what the #pragma comment does). I added a few lines to suppress warnings for size mismatches - if it were my code I'd get to the bottom of it, but you should be ok in this instance

Wow it worked with your pragma code! Thanks man! You don't know how happy I am right now, whereas it seemed to be not that hard as I suspected. Thanks!

No probs.

Reopening. I have the dll but when I run DLL Export Viewer (DLL Export Viewer - view exported functions list in Windows DLL) over it, it does not give me the functions that I would expect from the .h file.

Any ideas what could be the reason for this?

I have added:

# define GL2PSDLL_API
# define GL2PSDLL_API __declspec(dllexport)

and now it seems to work