I am planning on using the library stb_image by Sean Barrett to load images into a graphics application. Lib code at the repository below:
https://github.com/nothings/stb/blob/master/stb_image.h
Though its documentation is short and clear for me in terms of adding the header stb_image.h to your project, and then:
Do this:
#define STB_IMAGE_IMPLEMENTATION
before you include this file in *one* C or C++ file to create the implementation.
// i.e. it should look like this:
#include ...
#include ...
#include ...
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
when I build it on VS2013, the compiler throws the following error:
Error 1 error C2014: preprocessor command must start as first nonwhite space c:\users\ed\desktop\opengl\stbi\stb_image.h 2318 1 STBI
...
At the beginning, I thought it was it was a line ending problem (Win32 LF, Linux CR LF), but it seems not to be.
Any hints of what might be causing this error is welcome !
Related
Edit: adding OpenCL.lib in library files section of visual studio solved the problem.
With cl2.hpp from this github repository pointed by khronos site, I get 60-70 similar errors when I try to compile a C++ dll project with OpenCL-C++-implementation functions to export.
'CL_DEVICE_QUEUE_ON_HOST_PROPERTIES': undeclared identifier
// I'm not using this, I'm newly converting a v1.2 C++ binding-based
// project to a v2.0 one
starting of the file is:
using namespace std;
#define __CL_ENABLE_EXCEPTIONS
#include <CL\cl2.hpp>
and the remaining lines are not underlined with red(visual studio). There are some compile time constants I need to add maybe, but I don't know which constants.
What is missing?
this code(there isn't any other code in project) also gives same error:
#include <CL\cl2.hpp>
I had the same errors and something that worked for me was to add the following prior to #include <cl2.hpp>
#define CL_HPP_TARGET_OPENCL_VERSION 120
#define CL_HPP_MINIMUM_OPENCL_VERSION 120
#include <cl2.hpp>
I'm trying to play a RTSP stream in Unity 5.
For that I found a RTSP-plugin for Unity on Github that I want to try, but unfortunatelly it comes with no Readme or installation guide whatsoever.
So far I found out that I'm dealing with a C++ Visual Studio project that needs to be compiled into a DLL in order to add it to Unity. But when I try to build the project I get the following Error for the header file "ffmpegenv.h":
Error C1083 Cannot open include file: 'libavutil\opt.h': No such file or directory - (Screenshot)
Here's the code from the header file
#pragma once
//=============================
// Includes
//-----------------------------
// FFMPEG is writen in C so we need to use extern "C"
//-----------------------------
extern "C" {
//#define INT64_C(x) (x ## LL)
//#define UINT64_C(x) (x ## ULL)
#include <libavutil\opt.h>
#include <libavutil/mathematics.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libswresample/swresample.h>
#include <libavutil/imgutils.h>
#include <libavcodec/avcodec.h>
}
I'm aware that the header includes source code from the FFmpeg libraries which doesn't come with the plugin I'm trying to compile. So I downloaded the FFmpeg source code from their GitHub page and copied all the code files (with its original folder structure) inside the plugin's project folder.
However when I then try to compile the plugin, it still doesn't find the #includes an shows the same error as mentioned above.
How I can I get the plugin to compile? What am I missing?
Thanks in advance
P.S.: I'm using Visual Studio Community 2017 with C++ support and Win 10 SDK as well as Win 8.1 SDK.
I'm using SDL for opening a window and handeling events. And OpenGL to render my objects to the screen. SDL_mixer for sound, and SDL_ttf for text. Now I'm trying to figure out how to be able to put a video on display. Like an animated logo or something before the game starts. Just to experiment with it. At some point I will need to know it...
I've found and tried installing FFMPEG, I've included the "include" folder, and set the "lib" folder. At first I got an error telling me it was unable to load "inttypes.h". So I downloaded a package with that and put it in the include folder for FFMPEG.
Now I'm stuck with this error, which I can't seem to be able to solve.
c:\program
files\ffmpeg-20140507-git-4cdea92-win64-dev\include\libavutil\common.h(87):
fatal error C1004: unexpected end-of-file found
And another question, is there other libraries aviable that may be easier to use for displaying a simple video? I read something about SDL being able to do it, but nothing was to be found about it.
EDIT: Here is line 78 to 96:
#if FF_API_AV_REVERSE
extern attribute_deprecated const uint8_t av_reverse[256];
#endif
#ifdef HAVE_AV_CONFIG_H
# include "config.h"
# include "intmath.h"
#endif
/* Pull in unguarded fallback defines at the end of this file. */
#include "common.h"
#ifndef av_log2
av_const int av_log2(unsigned v);
#endif
#ifndef av_log2_16bit
av_const int av_log2_16bit(unsigned v);
#endif
Wrap your #include <libav*.h>s inside a block like this:
#ifndef __STDC_CONSTANT_MACROS
#define __STDC_CONSTANT_MACROS
#define UNDEFINE_STDC_CONSTANT_MACROS
#endif
extern "C"
{
#include <libavdevice/avdevice.h>
#include <libavdevice/version.h>
}
#ifdef UNDEFINE_STDC_CONSTANT_MACROS
#undef __STDC_CONSTANT_MACROS
#endif
There's probably a way around using the UNDEFINE_STDC_CONSTANT_MACROS hack but the logic just isn't coming to me right now.
Worked for me on VS2012 using Zeranoe's 32-bit ffmpeg development binaries and msinttypes' inttypes.h.
Hmm, I found the DLL-files, and it gave me a linker error with the 64-bit library.
I changed back to 32-bit and the 32-bit dlls and it worked fine. I guess that libraries ask if you have 32/64-bit Visual Studio insteath of Windows.
i'm a total novice with OpenGL, and I have to compile a file (my first file using opengl), the headers of the file are :
#include <GL/glut.h>
#include <GL/gl.h>
#include <iostream>
I downloaded glut, put the glut.h in the right folder, and put the glut32lib in the right folder too (in Code Blocks).
I also linked glut32.lib in the linker settings.
But i can not compile, i have errors like this :
....\Desktop\OpenGL\OpenGL\prog3.o:prog3.cxx|| undefined reference to `__glutInitWithExit'|
Please can you help me ?
EDIT : Solution foud here : GLUT compile errors with Code::Blocks
All that was needed was #include before including GL/glut.h
I don't know why...
This was my problem. I found solution for this problem in 2 step.
Step 1: follow instructions in this link: Using OpenGL & GLUT in Code::Blocks
Step 2: add #include <GL/glu.h> before #include <GL/glut.h>
Attention: you must create new project, not blank source file. Just follow how to do it in that link.
I am trying to build a C++ app that uses both websocketpp and MySQL. I have encountered 2 build problems using VS 2010 C++ Express.
1) A problem with the boost libraries. It produces many errors like this:
1>c:\program files (x86)\boost\boost_1_50\boost\thread\win32\thread_data.hpp(210): error C2146: syntax error : missing ')' before identifier 'rel_time'
Here's the relevant snippet from thread_data.hpp starting with line 210:
inline BOOST_SYMBOL_VISIBLE void sleep(TimeDuration const& rel_time)
{
interruptible_wait(detail::pin_to_zero(rel_time.total_milliseconds()));
}
2) A conflict with the word VERSION which is documented here and I believe is independent.
To make a clear and simple example of the boost build problems, I'm using the websocketpp example: echo_server.cpp to which I added these includes:
#include "stdafx.h"
Boost lib includes recommended by "Building a program with websocketpp" on the websocketpp site.
#include <boost/regex.hpp>
#include <boost/random.hpp>
#include <boost/system/api_config.hpp>
#include <boost/system/config.hpp>
#include <boost/system/error_code.hpp>
#include <boost/system/system_error.hpp>
#include <boost/system/windows_error.hpp>
and the MySQL header includes. Adding these 2 boostincludes triggers the build errors. If I comment out these 2 includes, it builds without errors:
#include <my_global.h>
#include <mysql.h>
Any suggestions on how to deal with the boost problems?
I don't think this is the same build problem as this one, "Trying to build websocket++ with MinGW: last few linker errors — what could it be?"
Concerning the first error, check if there are any macros interfering with the code. Right-click and go to definition or #define the macro yourself at the beginning of the file and see where it gets redefined. In really hard cases, look at the preprocessor output via a compiler flag.
Concerning the rest, you don't provide any versions for Boost and MySQL. Then, there is my_global.h (or is that part of MySQL?) and stdafx.h, which are both under your control but you don't show them here. Also, try to reduce the issue to the smallest possible piece of code. In short, provide a reproducible example.