Calling win32 C++ dll from C#

[Guest]

Hi there,

I need to make a call into an unmanaged DLL from a C# application, and I am
getting a SafeArrayTypeMismatchException which basically means that either
what I am sending to the DLL is incorrect, or what I am getting out is not
what the C# code expects.

My question is this: How do I know which array is the troublesome one?
Within the call there are numerous arrays all contained within different
structs.

Regards,

FV

 

[DeveloperX]

Can you post the function prototype? I'd guess there's some sort of
pointer to a buffer and a length parameter as a minimum?

 

[Jianwei Sun]

[DllImport("filename.dll", EntryPointentrypointname")]
private static extern int DoStuff(ref Series pData, ref StdStat
pStdstat, ref Settings pSettings, ref EXSM pExSm, ref BOXJ pBj, ref SMA pSma,
ref Dscr pDsc, ref Croston pCroston);

where each of the parameters is a struct of which some contain arrays.

Can you post the function prototype? I'd guess there's some sort of
pointer to a buffer and a length parameter as a minimum?

It's best that you can also post your code to show us how you call it.

 

[Ben Voigt]

[DllImport("filename.dll", EntryPointentrypointname")]
private static extern int DoStuff(ref Series pData, ref StdStat
pStdstat, ref Settings pSettings, ref EXSM pExSm, ref BOXJ pBj, ref SMA
pSma,
ref Dscr pDsc, ref Croston pCroston);

where each of the parameters is a struct of which some contain arrays.

When you define those structs in C#, you probably need to be using the
"fixed" keyword, otherwise C# assumes they are SAFEARRAYs.