I've spent the last 4 days trying to accomplish the following task:
- create a MySQL Database
- connect to the database in a c++ win32 application so I can use the data and/or edit the data.
So far so good, I'm using the following:
- Packard Bell with 64bit Windows 7 Home Edition
- Visual C++ Express 2010
- Downloaded and installed mysql 5.5 (choosing the complete installation)
I have no problems using the mysql terminal and creating a simple Database, however establishing a connection to it in my c++ code is a major hurdle. Some tutorials, forums etc. recommend connecting directly and others suggest using ODBC. The first suggestion leads to a ton of issues with Visual Studio not being able to find source files when including header files:
mysql_connection.h
cppconn/driver.h
cppconn/exception.h
etc...
could not find the solution for these issues so I turned to ODBC and found the following code:
(see next post, was not allowed to post more than 2 links)
The code actually compiles but can't find anything. See screen below:
http://imageshack.dk//viewimage.php?file=/imagesfree/CD525364.jpg
I can't find the solution for the problem. This ODBC Data source "mysql" has been set up manually as shown below:
http://imageshack.dk//viewimage.php?file=/imagesfree/WEG25517.jpg
I've read the official mysql documentation for setting up visual studio with the right directories and libraries and since the code compiles that can't be the problem right?
I would really appreciate any help or suggestions :) thanks in advance.
Have you configured your project properties?
I am assuming that you've installed MySQL at C:\MySQL
Open visual studio --> Solution Explorer --> Right Click --> Properties --> C/C++ --> General --> Add Include Directories --> Click to edit and write C:\MySQL\include (or where ever you've installed MySQL and locate its include folder).
Now in same properties dialog navigate to Linker --> General --> "Add additional Library Directories" --> (write the path of folder which contains .dll or .lib files e.g. C:\MySQL\Connector ODBC)
In same properties dialog navigate to Linker --> Input --> Additional Dependencies --> (write the name of .lib file you want to use e.g. libmysql.lib or any other library you want to use which is placed in above "Additional Libraray Directories").
Hope it will help you.
Related
I have recently switched my IDE to Visual Studio 2019 for C++ projects. I easily followed a tutorial into setting up a new library like SFML into visual studio, and tell it where the additional include and library directories are.
But there is something else that is required for it to work, which are the .dll files. Every page I followed, even the Documentation by the SFML website, it says that they have to be in the same directory as my project. That means I need to copy-paste the 7-8 files into my project directory. This really makes the folder look untidy. I would like to create a new folder and tell Visual Studio where those files are. I tried going doing this
Project -> Properties -> Linker -> Input -> Additional dependencies
Usually, the lines that would work are
sfml-system-d.lib
sfml-window-d.lib
...
I tried doing $(ProjectDir)valid path\ sfml-files.lib but this gives me the linker error, saying that It could not find the file.
If I simply move the .dlls into a folder without doing anything, the code would compile and link fine. But when it runs, Windows gives me a pop-up box with the same error message.
Here is how it currently looks
Looks really messy, I just want to be able to move them into dependencies like how src contains the source files.
How can I achieve this?
As it is now, it works perfectly fine. The issue only occurs when I try to create a new folder.
I hope I have covered the important information required for a good answer, If not please let me know what more I should add
Microsoft Visual Studio 2019
Currently running 64-bit platform with Debug configuration. Hence the -d suffix
You could create a path environment for your specified directory, which is like drescherjm’s suggestion. The steps:
Right-click “This PC” -> “Properties”-> “Advance System settings”
Click “Environment Variables”
In the System Variables group, edit “Path”
Add your directory, for example: ”D:\ SFML-2.5.1\bin”
Restart your visual studio and re-open your project
The easier solution might be to put them in the x64 subdirectory. This allows you to have various builds side by side (x86/x64, debug/release).
Since this x64 directory is where the EXE is located, it is the first directory searched for DLL's. It will take precedence over the Path solution suggested in the other answer. The Path directories are searched last of all.
I started working as a research fellow at my university and was instructed to develop a component for an already existing application written in C++ using an in-house framework, also developed in C++.
Currently I am struggling with properly setting up the project in Visual Studio 2017.
Whenever I try to include a file from the framework, IntelliSense complains about not being able to open the file.
However, following things add to the oddness of the problem:
The solutions properties are set correctly; the project DOES build without any complaints.
Writing the '#include'-directive, IntelliSense DOES suggest the correct relative path to the header files (i.e. #include <framework/class.h>).
I can open the header file from within the source file referencing it, using the 'Open Document "class.h"' dialog.
I have already came across this:
IntelliSense: Cannot open source file in include path
Intellisense cannot open source file "*.h"
So far, nothing solved my issue. Did someone come across this issue yet?
TL;DR
Everything compiles fine.
"C/C++ -> General -> Additional Include Directories" is set properly.
"VC++ Directories -> Include Directories" is set as well.
IntelliSense properly suggests header file, when writing include directive.
BUT IntelliSense reportedly fails to open the file, thus not indexing it.
I am stuck with a fancy but resource hungry text editor.
EDIT:
I am working on a MacBook "13 2016; installed Windows 10 Pro 64-bit via Bootcamp.
This issue occurs because Windows now has the option for making folders case-sensitive and intellisense has a habit of changing the case of files that it tries to open.
Intellisense tries to use a path like C:\WORKSPACEPATH\PROJECTDIR\MYFILE.cpp (i.e. all uppercase), but if C:\workspace (or any of the other directories in the path) are set to be case-sensitive and don't exactly match, it won't be found.
In my case it was because I created the folder via WSL which enables case sensitivity by default on any new directories it creates (including via things like git clone). See here
Easy Fix
This can be fixed by running the following:
fsutil file setCaseSensitiveInfo <directory> disable
More Commands
You can check whether a folder has case sensitivity enabled by running
fsutil file queryCaseSensitiveInfo <directory>
and Finally, a handy one-liner to disable this recursively:
for /r /d %f in (.) do (fsutil file setCaseSensitiveInfo %f disable)
(This info was originally posted as a comment to the original question, before it turned out it was in fact the same problem. See the comments for input from a couple of other people)
For a Linux project open in Visual Studio 2022, I tried the accepted answer from #yothsoggoth, , which makes sense to me, but unfortunately didn't work.
I realized that visual studio couldn't even open the C++ file from the standard library using F12 but it could open others from other libraries.
So in my case the solution was to close visual studio, backup the folder working as a cache.
C:\Users\[user]\AppData\Local\Microsoft\Linux to C:\Users\[user]\AppData\Local\Microsoft\Linux.bak
Then I reopened Visual Studio and let CMake to regenerate the cache.
The errors now are gone and I can now even open <string> and others from the C++ std library with F12.
I hope this workaround helps others
My goal is to compile existing C++ classes (legacy code, stored in a set of *.h files) into a DLL so that it can be further integrated into a C# application.
For that purpose, it seems best to use MS Visual Studio. I have no experience with this environment, so I tried the naive approach found on MSDN and other SO answers:
File | New | Project from existing code
selected Visual C++
selected file location that is base for include references used in those .h files
specified a project name
let the wizard find and add all C++ files below the directory
selected "Use Visual Studio" for build, with project type "Dynamically Linked Library (DLL) project"
checked none of the checkboxes below (ATL, MFC, CLR)
specified . dir in the "Include search paths (/I)" in Debug settings
checked "Same as Debug configuration" in "Release settings"
clicked Finish button
This creates couple of VS files in the directory:
mylibrary.sln
mylibrary.vcxproj
mylibrary.vcxproj.filters
mylibrary.vcxproj.user
With a project created this way, I press F6 or select Build | Rebuild solution from the menu.
Then I expect the build to produce the .dll file somewhere, but it does not appear. Only these files appear:
.vs/mylibrary/v15/.suo
.vs/mylibrary/v15/Browse.VC.db
.vs/mylibrary/v15/Browse.VC.opendb
.vs/mylibrary/v15/ipch/AutoPCH/efad7c74cd39331b/EXAMPLE.ipch
Debug/mylibrary.log
Debug/mylibrary.tlog/mylibrary.lastbuildstate
Next, I decided to try creating a fresh new library project, just to observe the differences to get some hints, but that did not help - there were too many differences, even in the file structure...
My questions are:
is my choice of MS Visual C++ a good one for given purpose?
if so, what am I doing wrong here?
I think your steps are probably correct and I think that the right approach to use the code from a C# application. You definitely can call a C++ library from C# by importing the methods.
You missed only to export the methods that you want to use from your library. try using __declspec(dllexport) with these methods. please check this link:
https://msdn.microsoft.com/en-us/library/a90k134d.aspx.
Also, the output should be at the build folder, not the source code folder
Compiling .h files into libraries is ok, the compiler does not care - however, the UI does.
Still, you can tweak this by directly editing the .vcxproj file.
While doing so, make sure that the <ClCompile> sections contain:
<RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
Note that you can use commandline for building the DLL project:
"%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin\MSBuild.exe" -target:Clean,Build
(this assumes that your current directory is the one with your .vcxproj)
I have been writing C++ code snippets sporadically to speed things up in R via Rcpp, but now I would like to do more using Armadillo library, but I am having trouble installing it.
The README file instructs to create a location for "include" folder and tell your compiler to use that location for header files (in addition to the locations it uses already).
If I save the "include" folder into C:\Users\me\Documents\ARMADILLO, then how do I instruct the compiler to use the appropriate location?
After some search, I tries typing into command line the following (after prompt: C:\Users\me>):
g++ Documents\ARMADILLO\include, but it did not work ("permission denied"). I hence wonder how this should be done.
Moreover, the README file finally instructs to: Configure your compiler to link with LAPACK and BLAS - I would very much appreciate an advice how this should be done as well.
Thanks a lot!
PS: I have Windows 7 and VS Express 2013 for Desktop.
Visual Studio uses solutions which are containers of projects. Each project has a settings page (right click the project in the Solution Explorer window). Under "Configuration properties" there's a VC++ Directories page, which in turn lists "Include Directories". Append ;C:\Users\me\Documents\ARMADILLO
BTW, I find it useful to put such libs under C:\libs\. Saves on path length.
I followed the guide at the link below in order to get a hello world source to compile but I keep getting a link error as shown in the title. I don't understand why. I did include the file "opencv_core231.lib" from the vc10 directory in the linker input section of my project properties (among other things directed in the guide). Any ideas?
Setup OpenCV-2.3 for Visual Studio 2010
You may have forgot the .lib in the Linker->Input->Additional Dependencies section. For example you have to write "opencv_core241d.lib" instead of "opencv_core241d"
In the 4-6 weeks I've been working with OpenCV 2.3 and Microsoft Visual Studio, I have copied all needed .dll files to my project folders. I believe that this is just how it is "done". I'm not saying you can't have some sort of link-sheet that you can import every time, but it has been working fine for me.
If you are interested, I used this guide for setup:
http://www.anlak.com/using-opencv-2-3-1-with-visual-studio-2010-tutorial/
This guy uses a property sheet to make projects, further along the path, easier to make. It's a decent walkthrough, with the exception that I could not find the property manager, which can be revealed through "View > Other Windows > Property Manager".
Hope this shed some light on your issue.