Excuse me!!
I have a DLL file named "TESTDLL.DL L".
In TESTDLL.DLL
export function :
void GetPChar(char** pstr);
In .NET C# ,
How to call "GetPChar(char* * pstr)" function ?
Thanks!! 3 14587
Dennis, Excuse me!!
I have a DLL file named "TESTDLL.DL L". In TESTDLL.DLL export function : void GetPChar(char** pstr);
In .NET C# , How to call "GetPChar(char* * pstr)" function ?
What does the function do? If it returns a single string pointer, try
it like this
[DllImport("test dll.dll")]
static extern void GetPChar(out IntPtr pstr);
---
IntPtr pstr;
GetPChar(out pstr);
string s = Marshal.PtrToSt ringAnsi(pstr);
Then you might have to free the returned buffer somehow, depending on
how its allocated by the DLL.
Mattias
--
Mattias Sjögren [MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/
Please reply only to the newsgroup.
Dear Mattias Sjögren :
Thanks for your answer.
But "char** pstr" is a string array.
Such as
pstr[0] ---> string a
pstr[1] ---> string b
pstr[2] ---> string c
In C# ,
How to declare and call it ?
Thanks a lot!
"Mattias Sjögren" <ma************ ********@mvps.o rg>
???????:uz***** *********@TK2MS FTNGP12.phx.gbl ... Dennis,
Excuse me!!
I have a DLL file named "TESTDLL.DL L". In TESTDLL.DLL export function : void GetPChar(char** pstr);
In .NET C# , How to call "GetPChar(char* * pstr)" function ?
What does the function do? If it returns a single string pointer, try it like this
[DllImport("test dll.dll")] static extern void GetPChar(out IntPtr pstr);
--- IntPtr pstr; GetPChar(out pstr); string s = Marshal.PtrToSt ringAnsi(pstr);
Then you might have to free the returned buffer somehow, depending on how its allocated by the DLL. Mattias
-- Mattias Sjögren [MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ Please reply only to the newsgroup.
"Dennis" <ry**@ms6.hinet .net> wrote in message But "char** pstr" is a string array. Such as pstr[0] ---> string a pstr[1] ---> string b pstr[2] ---> string c In C# , How to declare and call it ?
Here's how I would do it [warning: haven't tested the code below]
[DllImport("test dll.dll")]
static extern void GetPChar(out IntPtr pstr);
string[] ret = new string[count];
IntPtr str;
GetPChar(str);
for(int i = 0; i < count; i++) {
ret[i] = Marshal.PtrToSt ringAnsi(Marsha l.ReadIntPtr(st r, i *
IntPtr.Size));
}
The above code asumes you know the number of items in the returned array
['count'] in advance.
Regards,
Pieter Philippaerts
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