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I'm trying to use opengl library in my main file. when I compiled it, an error message occurs that "gl.h is included before glew.h"
Firstly, I checked the build messages which file is including gl.h before including glew.h.
As a result, I found qopenglbuffer.h is including gl.h and it is included before including glew.h
But qopenglbuffer.h is library files.
Secondly, I added glew.h at forced include file list but it's not working.
I don't know how to fix this problem but I will keep trying to fix it.
Does someone Know how to fix this issue?
If you're already using Qt's OpenGL support you don't need GLEW.
See QOpenGLContext::versionFunctions and QOpenGLContext::extraFunctions to access OpenGL functions.
I finally fixed the problem. it caused included header file order.
I have used precompiled header to manage header files easily.
so, I included glew.h before gl.w in my precompiled header thank your comments were really helpful. :)
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The CPR lib is well installed using vcpkg however the including doesn't seem to work:
#include <cpr/cpr.h>
So in the compiler (G++) it says "no such file or directory".
I tried to copy the include folder in my sources folder and call the cpr.h file, it kinda worked but I needed to call api.h and then async.h etc which didn't work.
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it is possible to include headers files intro visual studio wihtout #include preprocessor ?
I mean, i have a .cpp intro a visual studio project, and i don't want to use #include intro header file or source file. I want to be included automatically.
I mean some Windows header files are included automatically.. Soo i think is possible with files from my project too..
Best regards.
Having some kind of global include files ain't what is recommended in C++ as you can't reason about dependencies anymore. Though it is possible with the Visual Studio compiler by using the /FI command line option.
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I'm using Eclipse IDE but there is a linking error while trying to build the project without a main.cpp file.
I know that what i'm trying to do is possible because the HelloWorld example has its main() method inside HelloWorld.cpp but i can't find what i need to change inside the eclipse IDE project building parameters.
That being said, is there any drawback in having the main() method in a file different than main.cpp in one project?
Thanks
Edit: After a computer reboot the problem never appeared again. I haven't been able to reproduce it since then so it looks like it wasn't a coding problem or conventional configuration issue. The normal behaviour is as described in the marked answer to this question.
Eclipse will check every file in the project for main, but not your entire harddisk. Did you add the file with main to your project?
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Here is the link: https://github.com/eyetribe
I tried to run this tet-cpp-client and in the output I am getting Gazeapilib.a file, and when I am trying to open it, it's giving me error that I can't open that file.
I want to know how to open this file, and what is the data of this file and how it can be used further in any program? I have not much knowledge about it so please help me to solve this error.
I am running this program in Ubuntu using cmake software.
The .a file is a library file which contains the definitions of the functions in the library that you compiled. It is not a standalone program and must be linked with other code to make a program. You must pass this library file to the linker after building your program.
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I am trying to compile a program(in OpenGL) in Ubuntu, but I am receiving this error
fatal error: common.h: No such file or directory
I am not sure on which package I need to install for this.
common.h is not part of any package. I suspect you took the code out of some project or a tutorial that was part of a whole set of programs. And common.h is a header common to all those projects.
If you arrive at this page, it's possibly because your going through the 'Introduction to Operating Systems' book and tried to copy the code from the intro chapter directly and compile. At least, that's why I ended up here. This won't work, and will throw the above error.
It's best to download the code directly from the source and compile what they give you. Enjoy!