LabVIEW
building DLL error with vc++ 6.0:error LNK2001: unresolved external symbol __imp__MessageBoxA@16
Solved!
MessageBox() is a Windows API. It is contained in user32.dll (not use32.dll). user32.lib is the import library that can locate functions in user32.dll and this import library should be added to the link settings.
For import libraries that come with Visual Studio or the Mocrosoft Platform SDKs you usually do not include a specific library file but instead the according name to the link settings. Visual Studio has its own default paths where it will look for such libraries and just adding user32.lib to the link settings will make sure that Visual studio is told to look for that file in the locations it has setup to look for link libraries.
chenyin wrote:the xample is better than the explaination.
So, could you please upload a vc++6.0 project example which includes the NumericArrayResize function and pass the vc++ 6.0 compile?
Thank you very much.
I have been trouble with it for 2 days......help me
时编辑过了
Your previous error is completely bogus without more information. As the error message indicates:
LINK : fatal error LNK1000: unknown error; consult documentation for technical support options
This gives us completely zero onformation to even start to guess what might be the problem. At least providing the example that you try to compile with all VC and LabVIEW files as a ZIP archive is the absolute minimum that is required before anyone can even start to guess what your problem might be.
As to examples for NumericArrayResize. There are countless such examples on the NI site and even in the LabVIEW examples under examples\cins\lstrcat is one of them. Yes it is a CIN example which is in fact obsolete now, but the principle of the function call and the access to the Handle data afterwards is exactly the same independant if you use it in a DLL or a CIN.
Your labviewv.lib file seems most likely to be corrupt.
When I take your project and remove the reference to labviewv.lib and instead edit the project settings to use labviewv.lib in the link settings and toinclude my path to C:\Program Files\National Instruments\LabVIEW 8.6\cintools as additional link directory everything works fine.
Also your labviewv.lib is 1.7 MB large, mine from LabVIEW 8.0 to 8.6 are all around 450kB.
If this is a legit link file from LabVIEW 2009 it may have been created with a Visual C version and/or options that make it incompatible with VC 6. Consider that VC 6 is about 10 years old.
