'out' keyword in methodes param

[[Yosi]]

I have the following dll function:
RW_DLL_API int ReadBDll(DWORD Address, DWORD NumOfUnits, BYTE * val)

From my C# application I call this one as following :

[DllImport("RW_D LL.dll")]
extern static int ReadBDll(UInt32 Address, UInt32 NumOfUnits, out byte [] Block);
byte [] arr = new byte[5];
int i = ReadBDll(0x2e,1 , 5,out arr );
but after execution the function I got the following 'arr' value = <Undefined value> why ??????????????? ??????

[Mattias Sjögren]

Re: 'out' keyword in methodes param


Just remove the out keyword and it should work better.



Mattias

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[Jon Skeet [C# MVP]]

Re: 'out' keyword in methodes param

[Yosi] <Yosi@discussio ns.microsoft.co m> wrote:[color=blue]
> I have the following dll function:
> RW_DLL_API int ReadBDll(DWORD Address, DWORD NumOfUnits, BYTE * val)
>
> From my C# application I call this one as following :
>
> [DllImport("RW_D LL.dll")]
> extern static int ReadBDll(UInt32 Address, UInt32 NumOfUnits, out byte [] Block);
> byte [] arr = new byte[5];
> int i = ReadBDll(0x2e,1 , 5,out arr );
> but after execution the function I got the following 'arr' value =
> <Undefined value> why ??????????????? ??????[/color]

I suspect that the method has effectively set the value to null
somewhere.

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