interop, Exception on call to unmanaged dll. Attempted to read or write protected memory. This is often an indication that other memory is corrupt

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interop >> Exception on call to unmanaged dll. Attempted to read or write protected memory. This is often an indication that other memory is corrupt

by John » Fri, 02 Jun 2006 03:40:13 GMT

Hello,

I'm having a problem with a call to an unmanaged dll. I've been
looking at for some time and hopefully one of you can help me. I'm
also new to C# so it very easily could be a newbie issue.

Header File of dll.

int pfproInit();
void pfproCleanup();
int pfproCreateContext(int * context, char *host_addr, int host_port,
int time_out, char *proxy_addr, int proxy_port, char *proxy_logon, char
*proxy_pass);
int pfproDestroyContext(int context);
int pfproSubmitTransaction(int context, char *strParm, long lParmLen,
char **strResp);
void pfproCompleteTransaction(char *strResp);
char *pfproVersion();

C# definitions

public class Trans
{

[DllImport("pfpro.dll", EntryPoint = "pfproInit", CallingConvention
= CallingConvention.Cdecl)]
public static extern int Init();

[DllImport("pfpro.dll", EntryPoint = "pfproCleanup",
CallingConvention = CallingConvention.Cdecl)]
public static extern void Cleanup();

[DllImport("pfpro.dll", EntryPoint = "pfproCreateContext",
CallingConvention = CallingConvention.Cdecl)]
public static extern int CreateContext(ref int context,
StringBuilder host_addr, int host_port, int time_out, StringBuilder
proxy_addr, int proxy_port, StringBuilder proxy_logon, StringBuilder
proxy_pass);

[DllImport("pfpro.dll", EntryPoint = "pfproDestroyContext",
CallingConvention = CallingConvention.Cdecl)]
public static extern int DestroyContext(int context);

[DllImport("pfpro.dll", EntryPoint = "pfproSubmitTransaction",
CallingConvention = CallingConvention.Cdecl)]
public static extern int SubmitTransaction(int context,
StringBuilder strParm, long lParmLen, StringBuilder strResp);

[DllImport("pfpro.dll", EntryPoint = "pfproCompleteTransaction",
CallingConvention = CallingConvention.Cdecl)]
public static extern void CompleteTransaction(StringBuilder
strResp);

[DllImport("pfpro.dll", EntryPoint = "pfproVersion",
CallingConvention = CallingConvention.Cdecl)]
public static extern StringBuilder Version();
}

Calling code


StringBuilder transactionCommand = new StringBuilder(4096);
StringBuilder test = new StringBuilder("test-payflow.verisign.com");
StringBuilder test2 = new StringBuilder(String.Empty);
StringBuilder test3 = new StringBuilder(String.Empty);
StringBuilder test4 = new StringBuilder(String.Empty);
StringBuilder resp = new StringBuilder(4096);

transactionCommand.Append("TRXTYPE=D&TENDER=C&COMMENT1=www.test.com
Capture");

con = Trans.Init();
if (Trans.CreateContext(ref con, test, 443, 30, test4, 0, test2, test3)
== 0)
{
//The following line is where I'm getting the exception
Trans.SubmitTransaction(con, transactionCommand,
transactionCommand.Length, resp);
Trans.CompleteTransaction(resp);
Trans.DestroyContext(con);
Trans.Cleanup();
}


Thanks for any help given.

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interop >> Exception on call to unmanaged dll. Attempted to read or write protected memory. This is often an indication that other memory is corrupt

by Mattias Sjren » Fri, 02 Jun 2006 06:29:38 GMT


John,

[...]

long in C++ maps to int in C#. Change the lParmLen parameter type
accordingly.

The type of the last parameter type should probably be out IntPtr.


Mattias

--
Mattias Sjren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
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Foll is the output of the 'link' command about the dll:

link -dump -exports old.dll
File Type: DLL

  Section contains the following exports for old.dll

    00000000 characteristics
    3A352AEB time date stamp Mon Dec 11 14:28:43 2000
        0.00 version
           1 ordinal base
           1 number of functions
           1 number of names

    ordinal hint RVA      name

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        5000 .data
        2000 .rdata
        1000 .reloc
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