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| how can I use interop to get an array of string back from a dll ? |
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This message was discovered on microsoft.public.dotnet.framework.interop.
| bg |
| GOOD ANSWER |
hi all,
I have a function in a DLL exported like this "DllExport char *DSGetthingList(void)" - the return value (the char*) is an array of strings seperated by nulls with two nulls at the end. how can I get this back intact ?
I have tried StringBuilder and String and String[] but I only ever get the last string in the array back.
i.e
[DllImport("C:/build/server/asd/asd.dll")]
internal static extern StringBuilder DSGetProjectList();
[DllImport("C:/build/server/asd/asd.dll")]
internal static extern String DSGetProjectList();
[DllImport("C:/build/server/asd/asd.dll")]
internal static extern String[] DSGetProjectList();
TIA
bg
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| Mattias Sjögren |
| GOOD ANSWER |
bg,
Try it like this:
internal static extern IntPtr DSGetProjectList();
---
IntPtr p1, p2;
string s = null;
p1 = p2 = DSGetProjectList();
do {
s = Marshal.PtrToStringAnsi( p2 );
Console.WriteLine( s );
p2 = unchecked((IntPtr)((int)p2 + s.Length + 1));
} while ( s.Length > 0 );
// Free p1 here if needed.
Mattias
===
Mattias Sjögren (VB MVP)
mattias @ mvps.org
http://www.msjogren.net/dotnet/
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| bg |
| GOOD ANSWER |
thanks that got the data over then I wrote this to strip the strings out (assuming ansi)
private ArrayList GetStringArrayFromStupidApi(IntPtr sapi)
{
ArrayList arr = new ArrayList();
int idx = 0;
bool endFound = false;
StringBuilder curr = new StringBuilder();
do
{
byte byt = Marshal.ReadByte(sapi,idx++);
char c = (char)byt;
if(byt!='\0')
{
curr.Append((char)byt);
}
else
{
arr.Add(curr.ToString());
curr = new StringBuilder();
byte end = Marshal.ReadByte(sapi,idx);
if(end=='\0') endFound = true;
}
} while (!endFound);
return arr;
}
"Mattias Sjögren" <Click here to reveal e-mail address> wrote in message news:uzEK2PGxBHA.2324@tkmsftngp03...
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