org.jawin.COMException: 8000ffff: Invalid ptr null flag(原址：http://osdir.com/ml/windows.devel.jawin/2006-01/msg00013.html)

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
                }
            }
        }
    }
}