Error when converting CVI built in DLL sample to VC(6.0) DLL by using Measurement Studio AppWizard

[jacky Wang]

I'm just using CVI built-in DLL sample(\National Instruments\CVI71\samples\dll\basic\cvidll) and trying to convert it to Visual C++(6.0) DLL by using Measurement Studio AppWizard(7.0 for VS 6.0). Errors as follow:. It's very discouraged since i can convert built-in DLL to VC DLL.
--------------------Configuration: g - Win32 Release--------------------
Compiling...
toolbox.c
cvidll.c
Linking...
g.def : error LNK2001: unresolved external symbol SampleExportedFuncName
Release/g.lib : fatal error LNK1120: 1 unresolved externals
LINK : fatal error LNK1141: failure during build of exports file
Error executing link.exe.

g.dll - 3 error(s), 0 warning(s)

[JessicaP]

When you convert a CVI DLL using this wizard, a .def file is added to the project so that you can add any DLL exports.  This file is needed because CVI handles DLL exports in a way that Visual C++ does not support.  To fix this linker error, you need to comment out this line with a semi-colon in the .def file:

SampleExportedFuncName

This should solve the problem.

Jessica

[Andrew W]

Jacky,

In addition to commenting out the "SampleExportedFuncName", you must also include a list of the names of the functions exported by the dll.  For that specific example, I believe you can use the following:

    DLLFunc1 @1
    DLLFunc2 @2

This site has some great information on using the def files for creating a DLL with the .def file.


Regards,

Andrew W.  || Applications Engineer