OpenCV - DLL missing but it s not

Question

I am trying just a basic program with OpenCV with the following code    include  cv h   include  highgui h   int main         IplImage  newImg      newImg   cvLoadImage    apple bmp   1       cvNamedWindow  Window   1       cvShowImage  Window   newImg       cvWaitKey 0       cvDestroyWindow  Window        cvReleaseImage  amp newImg       return 0      When I run this  I get      The program can t start because   libcxcore200 dll is missing from your   computer   Try reinstalling the   program to fix this problem    However  I can see this DLL   It exists   I have added the following to the input dependencies for my linker     C  OpenCV2 0 lib libcv200 dll a   C  OpenCV2 0 lib libcvaux200 dll a   C  OpenCV2 0 lib libcxcore200 dll a   C  OpenCV2 0 lib libhighgui200 dll a   What gives  I m using visual studio 2008   When I link the  dll files instead of  dll a files  I get      fatal error LNK1107 invalid or corrupt   file  cannot read at 0x3F8   libcv200 dll

User · Answer

Just for your information after add the  PATH  for my win7  i need to reboot it to get it work

User · Answer

I followed instructions on http   opencv willowgarage com wiki VisualC 2B 2B VS2010 but was still stuck on exactly the same problem  so here s how I resolved it     Fetched MSVC 2010 express edition  Fetched Win 32 OpenCV 2 2 binaries and installed in default location  Created new project  Project setup  Project -  OpenCV Helloworld Properties   Configuration Properties -  VC   Directories   Include Directories    add  C  OpenCV2 2 include    Library Directories    add  C  OpenCV2 2 lib C  OpenCV2 2 bin   Source Directories    add   C  OpenCV2 2 modules calib3d src C  OpenCV2 2 modules contrib src C  OpenCV2 2 modules core src C  OpenCV2 2 modules features2d src C  OpenCV2 2 modules flann src C  OpenCV2 2 modules gpu src C  OpenCV2 2 modules gpu src C  OpenCV2 2 modules highgui src C  OpenCV2 2 modules imgproc src C  OpenCV2 2 modules legacy src C  OpenCV2 2 modules ml src C  OpenCV2 2 modules objdetect src C  OpenCV2 2 modules video src    Linker -  Input -  Additional Dependencies     For Debug Builds    add    opencv calib3d220d lib opencv contrib220d lib opencv core220d lib opencv features2d220d lib opencv ffmpeg220d lib opencv flann220d lib opencv gpu220d lib opencv highgui220d lib opencv imgproc220d lib opencv legacy220d lib opencv ml220d lib opencv objdetect220d lib opencv video220d lib     At this point I thought I was done  but ran into the problem you described when running the exe in debug mode  The final step is obvious once you see it  select   Linker -  General     Set  Use Library Dependency Inputs  to  Yes   Hope this helps

User · Answer

Copy all  dll from  bin in System32

User · Answer

just open the bin folder and copy and paste the  dll files to the folder you are working in  it should fix the problem

User · Answer

I have had numerous problems with opencv and only succeded after a gruesome 4-6 months  This is the last problem I have had  but all of the above didn t work  What worked for me was just copying and pasting the opencv core2  dll  and opencv highgui2  dll which it will ask for since you included this as well  into the release  or debug folder - I m assuming  Haven t tested this  folder of your project  where your application file is   Hope this helps

User · Answer

Just add C  OpenCV2 0 bin into your PATH environment variable   or   When  you install OpenCV    Choose the option  Add OpenCV to the system PATH for current user which is not default one

User · Answer

This might be like resurrecting a dead horse  But just so it s out there  the reason why the answer to these types of questions to simply put dll s into the system32 folder is because that folder is in the os s system path    It s actually best practice to provide the os with a path link   With windows 10   open up file explorer right click on  this pc  and select  properties  Now in the  Control Panel System and Security System  window that comes up  click on  Advanced System Settings  from the left hand panel  At the bottom of the next window  click on the  Environment Variables  button  On the next window  there are two panels  the top one is for modifying variables to the current user  and the bottom panel is for modifying variables to the system  On the bottom panel  find the variable  Path  and click it to select it  then click on the  edit  button  Here you can then create  edit  delete  or update the different paths for the system  For example  to add mingw32-make to the system so you can access that command via command prompt  click new  then paste in the path to the bin  Example path   D  Qt Tools mingw730 64 bin   no quotation marks nor additional whitespaces  Click ok on all the windows so that the changes are saved  then reboot your computer for the changes to be loaded

User · Answer

Just copy the  dll files to C  windows system32

User · Answer

As to  Marc s answer  I don t think VC uses the path from the OS  Did you add the path to VC s library paths  I usually add the DLLs to the project and copy if newer on the build and that works very well for me

User · Answer

No need to do any of that  It is a visual studio error   just go here  http   connect microsoft com VisualStudio Downloads DownloadDetails aspx DownloadID 31354  and download the appropriate fix for your computer s OS  close visual studio  run the fix and then restart VS  The code should run without any error

User · Answer

In Visual Studio 2013 you need to add this to the Environment Variables and then Restart your pc  This is the path where  dll file located in

User · Answer

You just need to add the folder of the needed dll file  or files  to your system  Environment Variables  in  Path   Your problem will 100  be resolved  I had this problem too

User · Answer

The   a  at the end of your DLL files is a problem  and those are there because you didn t use CMAKE to build OpenCV 2 0   Additionally you do not link to the DLL files  you link to the library files  and again  the reason you do not see the correct library files is because you didn t use CMAKE to build OpenCV 2 0   If you want to use OpenCV 2 0 you must build it for it to work correctly in Visual Studio   If you do not want to build it then I would suggest downgrading to OpenCV 1 1pre  it comes pre-built and is much more forgiving in Visual Studio   Another option  and the one I would recommend  is to abandon OpenCV and go with EmguCV   I have been playing with OpenCV for about a year and things got much easier when I switched to EmguCV because EmguCV works with  NET  so you can use a language like C  that does not come with all the C   baggage of pointers  header files  and memory allocation problem   And as for the question of 64bit vs  32bit  OpenCV does not officially support 64bit   To be on the safe side open your project properties and change the  Platform Target  under the  Build  tab from  Any CPU  to  X86    This should be done any time you do anything with OpenCV  even if you are using a wrapper like EmguCV

User · Answer

you can find the opencv core248 and other dlls in opencv build x86 vc12 bin folder  Just copy the dlls you require into system32 folder  And your app should start working in a flash   Hope it helps

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