Visual Studio 2010 NotesΒΆ

  • Programs built with Visual Studio 2010 can link with the static binary libraries supplied in the liblept Visual Studio 2008 pre-built binaries for Windows archive.

    You can also link with the dynamic binary libraries as long as you follow these rules:

    • Any memory allocated by liblept has be be freed with the new lept_free() function. For example, this includes the strings returned by getLeptonicaVersion(), getImagelibVersions(), and genTempFilename(), and the data created by pixWriteMemTiff().

    • Any file handles required by liblept have to be created by the new lept_fopen() function and closed with the new lept_fclose() function.

    Failure to follow these rules will result in a crash due to the simultaneous use of two incompatible C Runtime DLLs (msvcr90.dll and msvcr100.dll). See Using Visual Studio 2010, how can one link to a DLL generated by Visual Studio 2008 for the gory details.

  • When converting the VS2008 Solution, you’ll get a number of warnings like the following in the Conversion Report:

    MSB8012: $(TargetName) ('liblept168') does not match the Librarian's OutputFile property value 'LIB Debug\liblept168-static-mtdll-debug.lib' ('liblept168-static-mtdll-debug') in project configuration 'LIB Debug|Win32'. This may cause your project to build incorrectly. To correct this, please make sure that $(TargetName) property value matches the value specified in %(Lib.OutputFile).

    Fix the liblept168 project by doing the following:

    1. Right-click on liblept168 and choose Properties.

    2. Then change liblept168 Property Pages | General | Target Name to one of the following values:

      For the LIB Debug Configuration:


      For the LIB Release Configuration:


      For the DLL Debug Configuration:


    The ioformats_reg project also needs to be fixed:

    1. Right-click on ioformats_reg and choose Properties.

    2. From the Configuration dropdown menu choose All Configurations.

    3. Change ioformats_reg Property Pages | Linker | General | Output File to:

    4. You still need to follow the instructions at create a new Visual Studio Project.

    Exit and restart Visual Studio (or close and reopen the liblept solution).

  • To use the “Create Leptonica prog Project AddIn” follow the instructions for Visual Studio 2008 but copy vs2008\CreateLeptonicaProgProjects.AddIn and vs2008\CreateLPP.dll to your Visual Studio 2010 Addins folder (normally C:\My Documents\Visual Studio 2010\Addins).

    Edit CreateLeptonicaProgProjects.AddIn and change:



  • The building of the image libraries has not been tested using Visual Studio 2010. Given the problems encountered while building liblept you can probably expect to have some issues.