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07.19.2007 at 05:58AM PDT, ID: 22706757

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6.4

Clarion dll gives a "Attempted to read or write protected memory" error

Zones: Clarion, C# Programming Language

Tags: protected, read, write, memory, attempted

Hi,
I've a .DLL file that's made with Clarion. This DLL file does some things and returns a string value.
I want to use some methods of this DLL in my C# program. So I used dllimport with the methods I want to use.
So far so good, but sometimes I get a "Attempted to read or write protected memory" error. Not all the time.

I am not sure if I'm using the DLL import right in this case.
This is my dllimport syntax:
[DllImport("C:\\callcw.dll", EntryPoint = "getKlantbyID")]
public static extern string getKlantbyID(string companyid, string klantid);

and this is the way i call this method:
string xmlPath = getKlantbyID(companyid, klantnummer).ToString();
companyid and klantnummer are both of the type 'string'.

This is the function prototype in Clarion:
getKlantbyID(Long, Long),String,Pascal
The variable it returns is of the type 'CString(500)'

I'm not sure but I think the error has to do with the way I'm using the DLL in C#.

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Question Stats

Zone: Database

Question Asked By: rveede

Solution Provided By: Computer101

Participating Experts: 2

Solution Grade: A

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