Marshaling a String Array

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Rodger Brennan - 16 Dec 2004 18:11 GMT

I need to marshal as string array in C# to an IntPtr. Ist there any way to
do this. for instance.

string[] str = { "this", "should", "have", "a", "pointer" };
IntPtr ptr = Marshal.AllocHGlobal(Marhsal.SizeOf(str.Length * str.Length);
Marshal.StructureToPtr(str,ptr,false);

Thanks in Advance for any help.

Rodger

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Mattias Sj?gren - 19 Dec 2004 23:04 GMT

Rodger,

>I need to marshal as string array in C# to an IntPtr.

How should the array be laid out in native memory?

Mattias

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Rodger Brennan - 19 Dec 2004 23:18 GMT

It should be a PCWSTR "Pointer to an array of null-terminated Unicode
strings that contain the names of the attributes to retrieve for each
selected object" Here is exactly what I need this for
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ad/ad/dsop_init
_info.asp
I'm trying to set the apwzAttributeNames.

Thanks,
Rodger

> Rodger,
>
[quoted text clipped - 3 lines]
>
> Mattias

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Mattias Sj?gren - 05 Jan 2005 22:13 GMT

Rodger,

>It should be a PCWSTR "Pointer to an array of null-terminated Unicode
>strings that contain the names of the attributes to retrieve for each
>selected object" Here is exactly what I need this for
>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ad/ad/dsop_init
_info.asp
>I'm trying to set the apwzAttributeNames.

Sorry for the delay. Here's one way to do it that I think should work

int n = str.Length;
IntPtr[] stringPtrs = new IntPtr[n];
IntPtr array = Marshal.AllocHGlobal(IntPtr.Size * n);
for ( int i = 0; i < n; i++ ) {
stringPtrs[i] = Marshal.StringToHGlobalUni(str[i]);
Marshal.WriteIntPtr(array, i * IntPtr.Size, stringPtrs[i]);
}
dsop_init_info.apwzAttributeNames = array;

// call the API here

for ( int i = 0; i < n; i++ )
Marshal.FreeHGlobal(stringPtrs[i]);
Marshal.FreeHGlobal(array);

Mattias

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Marshaling a String Array

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