I have a few questions with .dll files in C and C++ and labview so bear with me. I have a C++ file that I am trying to make accesible through labview, is it possible to export member functions in C++ using the _declspec(dllexport). Another way I am going about this is trying to convert the file into C and I was wondering if anybody had knew of any examples whatsoever on serial communications in C and labview that I can take a look at. I tried writing a function in C using the HANDLE declaration, but I keep getting back weird things in Labview. I sent a command to erase the device and it should have said "Cannot Erase Flash" since the device was not powered on. Instead it said "Successfully Erased." Another problem I am having is that I am trying to return an array of characters to labview but i keep getting error messages in labview. I've read a lot of documents on it but including the one "External Code in Labview" but its not helpine me. Help!!!! HERE is my erase code: DWORD iBytesWritten; DWORD iBytesRead; BOOL bWriteRC; BOOL bReadRC; char *sBuffer; bWriteRC = WriteFile(a,"E\r",2,&iBytesWritten,NULL); if (bWriteRC){ ; //do nothing } else return "Cannot Erase the Flash"; bReadRC = ReadFile(a,&sBuffer,20,&iBytesRead,NULL); if (bReadRC){ return sBuffer; //do nothing } else return "Cannot Read the Flash"; Message Edited by Newguy100 on 07-30-2005 06:30 PMMessage Edited by Newguy100 on 07-30-2005 06:31 PM

LabVIEW

C and labview examples

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Basically, in one *.dll file I open a serial connection where my i use global variables for serial communication but I do a WriteFile function in another *.dll using the same serial connection. Is that possible?

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Nevermind, i tested it out all in one .dll and it seems to work this way.

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LabVIEW

C and labview examples

Re: C and labview examples

Re: C and labview examples