Calling win32 C++ dll from C#

[=?Utf-8?B?RnJhbmNvaXNWaWxqb2Vu?=]

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?
FrancoisViljoen wrote:

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

[Jianwei Sun]

FrancoisViljoen wrote:

[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.


"DeveloperX" wrote:

>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?
FrancoisViljoen wrote:

>>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

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

[Ben Voigt]

"FrancoisViljoen" <francoisv at dev dot barloworldoptimus dot comwrote in
message news:C8**********************************@microsof t.com...

[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.

>

"DeveloperX" wrote:

>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?
FrancoisViljoen wrote:

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