fopen not working when called through dll

[snguyen5]

Hi, I created a DLL in c++ and fopen is returning NULL.  

I have a funciton called int openfile(char *filename), which returns a 1 on success and 0 when fopen returns NULL.  This function always returns a 0 when I run it in TestStand 4.2.1.  I did development of the DLL in Visual Studio 2013.

When I run this DLL using TestStand 2013 it works, but for this situation, I need to have the dll work in testStand 4.2.1 as well 

[TBirkulosis]

It would probably be useful to enable debugging in your DLL to see what is going on. Microsoft Developer Network (MSDN) has several pages about enabling debugging in a C++ DLL: MSDN: Debugging DLL Projects

In your DLL, does TestStand pass the filename parameter to the DLL? Are there in errors in TestStand or do you just see the incorrect value (0)?

[snguyen5]

TestStand passes the filename parameter to the DLL.  I ended up fixing the problem by hard coding the filename into the function so everything is good now

[berkay123]

Hi, I am having the same issue although I already hardcoded my .csv file name. I am passing a string also but it is not a filename. I always get File could not be opened (fopen returns NULL) error. Do you have any suggestions for me?

Regards.