Re: Error: 8000ffff: Invalid ptr null flag when calling a DLL method

I now realise my arguments to invoke should be more along the lines of

byte[] result = tApp.invoke("GGGGIGGGG:I:G64", leos.size(), nbs, null,
ReturnFlags.CHECK_NONE);

Though I know this is 100% correct!  Once again, the parameters
to this method are as follows:

 > ---snip---
 > INT WINAPI CreateTrustedAppObject(
 > char *szDomainPath,
 > char *szAppName,
 > char *szAppDesc,
 > char *szTCPAddress,
 > WORD uwTCPPort,
 > BOOL bSSLRequired,
 > BOOL bRequiresQueueing,
 > BOOL bMessageRetention,
 > BOOL bOverwrite,
 > char *szTrustedAppKey);
 > ---snip---

szTrustedAppKey
(OUT) Points to the unique access key assigned to the trusted
application. Returns a 64 byte key plus null.

I have noticed discussion around using win32Invoke.  When I
attempt to use this method (along the lines of how others have
described) I receive the following:

---snip---
The method win32Invoke(int, String, int, int, byte[], Object[],
ReturnFlags) in the type GenericStub is not applicable for the arguments
(int, String, int, int, byte[], null)
---snip---

Thanks again!

Adam Bradley

Adam Bradley wrote:
> Hi all,
>
> Dipping my toe into COM/DLL type things and I was trying to write a
> jawin wrapper to call a DLL function. The method I want to use is well
> documented but I keep receiving the following error!?
>
> Anyone have any ideas - thanks in advance!
> Adam
>
> ---snip---
> org.jawin.COMException: 8000ffff: Invalid ptr null flag
>  at org.jawin.marshal.GenericStub.win32Invoke0(Native Method)
>  at org.jawin.marshal.GenericStub.win32Invoke(GenericStub.java:152)
>  at org.jawin.FuncPtr.invoke(FuncPtr.java:186)
>  at org.jawin.FuncPtr.invoke(FuncPtr.java:205)
>  at tApp.main(tApp.java:51)
> ---snip---
>
> The method in question is as follows
>
> ---snip---
> INT WINAPI CreateTrustedAppObject(
> char *szDomainPath,
> char *szAppName,
> char *szAppDesc,
> char *szTCPAddress,
> WORD uwTCPPort,
> BOOL bSSLRequired,
> BOOL bRequiresQueueing,
> BOOL bMessageRetention,
> BOOL bOverwrite,
> char *szTrustedAppKey);
> ---snip---
>
> And the application
>
> ---snip---
> import org.jawin.COMException;
> import org.jawin.FuncPtr;
> import org.jawin.ReturnFlags;
> import org.jawin.COMException;
> import org.jawin.FuncPtr;
> import org.jawin.ReturnFlags;
> import org.jawin.io.LittleEndianOutputStream;
> import org.jawin.io.NakedByteStream;
> import java.io.PrintStream;
> import java.io.OutputStream;
> import java.io.*;
>
> public class tApp {
>  public static void main(String[] args) throws Exception {
>
>   String szDomainPath = "c:/wpdomain.db"; // 4 [in] char*
>   String szAppName = "newapp";   // 4 [in] 8
>   String szAppDesc = "newapp description";// 4 [in] 12
>   String szTCPAddress = "localhost";  // 4 [in] 16
>   long uwTCPPort = 1;    // 8 [in] 24
>   String bSSLRequired = "FALSE";   // 4 [in] 28
>   String bRequiresQueueing = "FALSE";  // 4 [in] 32
>   String bMessageRetention = "FALSE";  // 4 [in] 36
>   String bOverwrite = "TRUE";   // 4 [in] 40
>   String szTrustedAppKey = "";   // 4 [out]44
>
>   FuncPtr tApp = null;
>   try {
>    tApp = new FuncPtr("GWTApp.dll",CreateTrustedAppObject");
>
>    // create a NakedByteStream for the serialization of Java variables
>    NakedByteStream nbs = new NakedByteStream();
>
>    // wrap it in a LittleEndianOutputStream
>    LittleEndianOutputStream leos = new LittleEndianOutputStream(nbs);
>
>    leos.writeStringUnicode(szDomainPath);
>    leos.writeStringUnicode(szAppName);
>    leos.writeStringUnicode(szAppDesc);
>    leos.writeStringUnicode(szTCPAddress);
>    leos.writeDouble(uwTCPPort);
>    leos.writeStringUnicode(bSSLRequired);
>    leos.writeStringUnicode(bRequiresQueueing);
>    leos.writeStringUnicode(bMessageRetention);
>    leos.writeStringUnicode(bOverwrite);
>    leos.writeStringUnicode(szTrustedAppKey);
>
>    byte[] result = tApp.invoke("IGGI:I:", 44, nbs, null,
> ReturnFlags.CHECK_NONE);
>
>   } catch (COMException e) {
>    System.out.println(e.getMessage().toString());
>    System.out.println(e.getClass().toString());
>
>    PrintWriter out = null;
>    try {
>     out = new PrintWriter(new FileWriter("c:\\tApp.log"));
>     e.printStackTrace(out);
>    } catch (IOException a) {
>     System.err.println("Caught IOException: " + a.getMessage());
>    } finally {
>     if (out != null) {
>      System.out.println("Closing PrintWriter");
>      out.close();
>     } else {
>      System.out.println("PrintWriter not open");
>     }
>    }
>    // handle exception
>   } finally {
>    if (tApp != null) {
>     try {
>      tApp.close();
>     } catch (COMException e) {
>      // handle fatal exception
>     }
>    }
>   }
>  }
> }
>
>
> HyperWeb Internet Services
> P.O. Box 451 Hamilton
> Brisbane, QLD 4007
> Mobile  : +61 419 637 518
> email: [email protected]
> IM : [email protected]
> Skype : adam_j_bradley
> Web : http://www.hyperwebis.com.au <http://www.hyperwebis.com.au/>
>