My application is using openssl (libeay32).
I've built the openssl myself and it is located somewhere.
This location is placed as the first location of 'PATH' value.
However I see the NSVC (2010) load the DLL from C:\Windows\SysWOW64 and not from the location I want. Why it is so? How can I fix it?
Thanks,
Rafi
Why it is so?
See Dynamic-Link Library Search Order.
How can I fix it?
Richter covers this in his book Programming Applications for Microsoft Windows. In general, use a .local file for DLL Redirection.
For the particular case of "Under the Debugger", see the Working Directory setting of the Visual Studio project at Project Settings for a C++ Debug Configuration.
Related
I wrote a tool that many users would use on their computers. I noticed however, that users who do not have visual studio installed, cannot open my executable. The error says that msvcp100.dll is missing. I found in internet a redistributable package from microsoft, that should apparently provide these dlls. My question is: is there another way to bypass this problem? Something like an option in the project properties?
Yes, you can change a compiler setting to link the C++ standard library classes into your program instead of having a dependency on the DLL. Right-click your project in the Solution Explorer window, Properties. Switch to the Release configuration (upper left). C/C++, Code Generation, Runtime Library setting. Select /MT.
Only do this when you only have a single monolithic EXE. When you use your own DLLs then you really need msvcr100.dll and msvcp100.dll so that the runtime library gets shared between all modules.
It is part of C++ runtime and the target machine needs it. THere are couple of ways to address it.
Please check following link from Microsoft MCVCP100.DLL
I am trying to use the DevIl image library in Windows in my project, using MSVS2010. I have downloaded the sdk "DevIL 1.7.8 SDK for 32-bit Windows" from http://openil.sourceforge.net/download.php and put in a folder where all my others libraries are. I have configured my project to include its headers and to link with the .lib provided. I have copied the dll provided to the folder my .exe is. It compiles and links with no problem but when i try to execute it i have an error popup saying something like "procedure entry point _ilGetData#0 could not be located in DevIl.dll" (translation from spanish). I have followed the same steps as in all libraries i am using with no problems, so i don´t know where the problem is.
Thanks for you help.
I believe the problem is that the binaries were built with an older version of Visual Studio... you may have to build the library yourself.
I'm not a a very experienced Windows developer, so I hope this all makes sense.
I created a Managed Assembly DLL using Visual Studio 2010. The DLL (Plip.dll) contains a C++ class that is using System.IO.SerialPort class to do some simple communication over a serial port.
In a second Visual Studio project I created a simple GUI that uses the class found in Plip.dll. In my GUI project I have the line : #using "Plip.dll" . In the Project Properties I set the 'Resolve #using References' value to the correct location of Plip.dll. The GUI builds just fine. If I copy the GUI.exe and Plip.dll to the same folder, the GUI runs just fine on my computer.
The problem I am having is that when I copy both files to a second computer, I cannot get the GUI executable to run. I get the following error : "System.IO.FileNotFoundException. Could not load file or assembly "Plip.dll" Vesion=.... ". I get this error even though both the exe and dll are located in the same folder.
Any suggestions on how to resolve this issue? Is there some option I need to set in my GUI project to load the DLL correctly at run time?
I suppose the problem is not the Plip.dll, but it's dependencies.
Use Dependency Walker on the second computer to see if it needs any other dll's (they might be installed in System folder or in %PATH% on your development computer, but not on the other).
If this second computer doesn't have Visual Studio installed, you are probably missing Microsoft Visual C++ 2010 Redistributable Package (you need to install it on the other computer)
Also make sure that you compile in Release because debug builds need debug dependencies.
I found the answer to this problem to be much simpler than Dependency Walker (but admittedly, that was fun to look at).
In my case, the issue was a mis-match between the .DotNet versions in the DLL and with the application's .net version. This was caused by building the "class library" using .DotNet 6.0 (dot net core?).
Instead, the entire class needed to be re-built using "Class Library (.NET Framework)"
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I wrote an article on this problem.
https://keyliner.blogspot.com/2022/09/visual-studio-c-linked-dll-exception.html
I have an error that I suspect might be caused by different versions of the CRT being loaded on two computers running Windows 7. How do I determine which version of MSVCR90.dll in the winsxs folder is being loaded?
My program is a DLL being loaded by another EXE. It is compiled using Visual Studio 2008 SP1.
As Al Kepp answered, you can use Dependency Walker, "Depends.exe". For DLLs that are dynamically loaded, the best way is to profile the application as it loads your library.
In Dependency Walker open the EXE, not your DLL. Then click "Profile-->Start Profiling". If the application requires arguments you can provide them in the window that opens, otherwise just click "Ok" to launch the program. Once the program is open, use it in the normal way so that it loads your DLL. Now that your DLL is loaded, you should be able to browse the tree in Dependency Walker to see which versions of the CRT are being used.
If you can't see the version, ensure that the full paths are shown in the tree by clicking the "C:\" button.
You can also see which version of the CRT the application or library is requesting by checking the manifest, which is generally, but not always included in the DLL or EXE. in Visual Studio, click "File->Open->File..." and select the EXE or DLL. Open the RT_MANIFEST resource and you should see some XML which lists the CRT as a dependency and the version.
Most applications using these language libraries in DLL files use simply the latest version of those DLL in Windows directory. If you for some reason need some specific version, the easiest what you can do is probably to put those correct files to the same directory as your exe.
You can use Dependency Walker application to see which DLL files are loaded into your process on startup. You can download it from Microsoft site for free.
Can someone link me a good guide for using libraries in a c or c++ project?
Right now I'm trying to add OpenCV to a newly created project. I've added all the directories I can think of in "Project and Solutions -> VC++ Directories" and to make sure I've dragged and dropped all the .lib and .dll files into the project.
The project builds but when I run the simple "Hello, World program" it gives me this error message:
"cv.exe unable to locate component.
This application has failed to start because cv200.dll was not found. Re-installing the application may fix this problem."
How can I really add this cv200.dll? I've dragged&dropped it into the project..
Thanks!
You need to make sure that cv200.dll is in the DLL search path at run time. The easiest way to do this is to put it in the same directory as the built executable. Dragging and dropping a DLL or LIB file into your project has no effect.
MSDN has a good description of the full DLL search order when loading libraries at runtime.
By default during installation OpenCV create env. variable path \bin.
All dll assumed to be in that dir. However you are using OpenCV 2.0, and OpenCV 2.0 installation doesn't include lib and dll files for Visual Studio. You seems already built all dll's and lib's. If you installed OpenCV correctly just move all dll's into \bin (for example C:\Program Files\OpenCV\bin)
If for some reason you are missing some dll or libs here is instruction how to build them
http://mirror2image.wordpress.com/2009/10/20/switching-to-opencv-2-0-with-vs2005/