I installed VS2012 today and started learning C++.
I wrote a Hello World program with #include <iostream.h>.
On build I get the error; C1083: Can not open include file... I believe this is an include path problem.
I tried editing the Include Directories in the VC++ Property Page but nothing I try works. Currently the include directories path has :
$(VCInstallDir)include
$(VCInstallDir)atlmfc\include
$(WindowsSDK_IncludePath)
Any thoughts on how to fix?
It's not <iostream.h>, it's just <iostream>.
For standard c++ headers you must not put the .h so :
#include <iostream.h>
should become :
#include <iostream>
After that, if you are beginning with cplusplus, here is a link with the standard library headers (and articles about c++). It is a great help to have this website : http://www.cplusplus.com/reference/
Related
I have created a simple Managed C++ project where I access CPoint from Atltypes.h. When compiling I am getting error 'errno.h' header not found. But I checked the project -> Properties -> VC++ Directories -> Include Directories... The header path is included.
The file errno.h is available in SDK path 'C:\Program Files (x86)\Windows Kits\10\Include\10.0.10240.0\ucrt'
But while compiling it is not able to pick it up. Is it due to any environment issue in my pc? Or is my visual studio settings corrupted?
After some more googling found that windows.h is key header which has all types. After adding below 2 headers in managed C++, it works fine
#include <Windows.h>
#include <msclr/marshal.h>
I just want to try c++ coding with Visual Studio code. I have installed vscode 1.18.1 to my laptop (Win10-64).
I got errors by typing following code:
#include <iostream>
using namespace std;
int main()
{
std::cout << "Hello world!" <<endl;
return 0;
}
Should happen no Error. C:\Users\Harri\OneDrive\Tiedostot\Demo2.vscode\c_cpp_properties.json -content:
"path": [
"/usr/include",
"/usr/local/include",
"${workspaceRoot}"
],
Problems/Errors for row 1:
" #include errors detected. Please update your includePath. IntelliSense features for this translation unit (C:\Users\Harri\OneDrive\Tiedostot\Demo2\Calc.cpp) will be provided by the Tag Parser. "
" cannot open source file "iostream" "
The main problem is cygwin paths
You have cygwin paths like /usr/include in your c_cpp_properties.json file. That is a problem because VSCode does not understand cygwin paths. At a cygwin shell you can run:
$ cygpath -w /usr/include
D:\cygwin64\usr\include
to get the equivalent Windows path. Put that into c_cpp_properties.json instead. Remember that you have to double the backslashes when you copy this into a JSON string.
Other suggestions
This SO answer describes how to set up VSCode with cygwin gcc. I haven't tried those instructions but they look reasonable.
Beyond that, I highly recommend going through the Get Started with C++ tutorial on the VSCode site. It might directly answer your question, but even if it doesn't, having a working setup to compare to is valuable.
Also, look at the C/C++ diagnostics: View → Command Palette... → C/C++: Log Diagnostics. This will show things like which compiler VSCode is trying to emulate and what it thinks the #include paths are.
Finally, to get lots of useful information directly from your compiler to compare with what VSCode thinks, if you are using gcc, run at a cygwin or bash prompt:
$ touch empty.c
$ gcc -v -E -dD empty.c > compiler-info.txt
That will write to compiler-info.txt all the predefined macros, #include search paths, default target, etc.
For some reason iosteam is a typo
Try using instead. It worked for me.
Working Code Screenshot
I downloaded sample code that uses a 'header only' library and even though I have included the library path in my VC++ project, I keep getting the error:
fatal error C1083: Cannot open include file: 'websocketpp/config/asio_no_tls.hpp': No such file or directory
Library header files location:
D:\websocketpp
D:\websocketpp\config
Here are the first few lines of the example program echo_server.cpp:
#include "stdafx.h"
#include <websocketpp/config/asio_no_tls.hpp>
#include <websocketpp/server.hpp>
The included files do exist in the directories above. I have specified the directories as follows:
Visual C++ Directories / Include Directories /
D:\websocketpp
C/C++ / General / Additional Include Directories
D:\websocketpp\config
Does someone know what the problem is?
It was a stupid mistake. I moved the entire directory structure into a new folder:
D:\websocket\websocket
D:\websocket\websocket\config
I have unit a.cpp that is used in several projects in subdirectory libA. Some of project are using precompiled headers, while others -not. In this case projects that use precompiled header must have line:
#include <stdafx.h>
and projects that are not using PCH must have line:
#include "..\stdafx.h"
Wise verse is not working.
Why project sees stdafx.h file in different way when project uses PCH or not?
UPD.
When I replace line #include <stdafx.h> with #include "..\stdafx.h" in project that uses precompiled header i have error
Error 19 error C1010: unexpected end of file while looking for precompiled header. Did you forget to add '#include "stdafx.h"' to your source?
Directory structure is the same in both projects.
There is no (or there should not be any) difference between <stdafx.h> and "stdafx.h". The only significant difference is that one project "sees" the file in current folder, and the other project sees it in parent folder. This difference is controlled by compiler option Additional Include Directories. One project has libA in it, and the other does not have it.
I am using Visual Studio 10 to program in C++
The 1st part of my program is
//Includes
//#include <LEDA\numbers> //fatal error C1083: Cannot open include file: 'LEDA\numbers': No such file or directory
#include <LEDA/numbers/real.h>
//Why do I get a linker error here
//All.obj : error LNK2001: unresolved external symbol "class leda::memory_manager leda::std_memory_mgr" (?std_memory_mgr#leda##3Vmemory_manager#1#A)
#include <LEDA\numbers\integer.h> //Here I used the system to write most of it for me
#include <LEDA/numbers/integer.h> //Include LEDA. So 2 things
//1. including the same file twice does not matter
//2. forward slashes and backward slashes are the same
//I tried to use a wild card and said #include <LEDA/numbers/*>
//But that did not work
#include <LEDA/numbers/rational.h>
#include <LEDA/core/string.h>
#include <LEDA/core/array.h>
#include <LEDA/numbers/bigfloat.h>
//The sqrt does not work
#include <iostream> //include ordinary C++
#include <math.h>
and I have a LINKER error
I have tried specifying which libraries to use by specifying the LIB User Environment symbol
I have tried specifying which libraries to use by specifying the
Include Directories and
Library Directories
in the properties of my Project
I have made a mistake somewhere, BUT where is it
There are several mistakes in this program:
LEDA\numbers is apparently a directory, not an include file. So you shouldn't try to include it.
(conceptual) #include statements don't help in resolving linker errors at all. Instead, you need to specify the libraries you want to link with to the linker; libraries are files that end in .lib. Go to the project settings, and add the libraries containing the missing symbols.
#include <abcd.h> // looks for the include abcd.h in the INCLUDES path.
#include "abcd.h" // looks for the include abcd.h in the current path and then INCLUDES path.
From your description it looks like your LEDA lib in under your current directory. Try using "" instead of <> and see if it fixes your errors.