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I've just compared this with my own JVM test system and all the calls and parameters look fine. I can only surmise that the external app or the DLL are somehow not in sync. If you call the Java function direct, rather than through the dll does that work? Also, are you sure the runtime error is on the call to the java method, rather than to some class method in the DLL?
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Yes, using the class in a plain java application works just fine.
Directly in front and behind the JNI call for the void method are the following debug outputs ...
fprintf(m_debug, "calling java void method\n" );
fflush(m_debug);
m_jni_env->CallVoidMethod(jobject_instance, j_method_id,(jint)n);
fprintf(m_debug, "called java void method\n" );
fflush(m_debug);
... and the last entry in debug text file is "calling java void method".
But while playing with both, C++ and Java code to get closer to the reason of this error, I discovered that removing
this.debugOutWriter.write("testMethod called, n = " + Integer.toString(n) );
this.debugOutWriter.write("----------------------");
from the Java code solves the problem. Funny thing is, the file access does not seem to be the problem because the lines
this.debugOutWriter.newLine();
this.debugOutWriter.flush();
remain as they were and the "CR/LF"-newline is written into the file correctly. But using the write method is causing the error.
Even if this is only a debug output that won't be required in the final version, I'm still curious about it's origin.
File writing operations won't be required for real functionality, but file read operations and the Java2D framework, and I doubt that this is just a special attitude of the BufferedWriter class..
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Well, I'm afraid I cannot figure out what is wrong with any of your code, it all looks fine to me. Sorry, but I'm unable to offer any further suggestions.
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Thanks for your efforts anyway 
I think I just figured out the problem:
The application I'm developping the DLL for seems to be multi-threaded and up to now I didn't attach/detach the current thread to the JVM.
Since the job to be done is linear and there's no gui I didn't thought of that (JVM is created in constructor, method calls are in the interface-method).
I have no idea why the void method without the write operations as well as the object returning method that's called earlier worked just fine without attaching the current thread (and this manner is reproducable!), but it's all working now
Once again, thanks for your effort!
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Happy to help, and glad you found the problem.
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Hi
How to convert Release Build to Debug build.I have a WorkSpase with release configuration ( Debug Multithreaded ).I have changed NDBUG to _DBUG , enabled Link incrementally and changed 'Debug info' to Program Database for Edit and Continue.Even then I am not able to Debug the application.Please Help
Thaks in Advance
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Why can't you just debug the debug build itself instead? If you have a peculiar problem occurring only with the release build, then please read this: Debug vs Release[^]
“Follow your bliss.” – Joseph Campbell
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Benjamin Bruno wrote: I have changed NDBUG to _DBUG , enabled Link incrementally and changed 'Debug info' to Program Database for Edit and Continue.
Are you making all of these changes manually?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
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Hi,
I'm facing a situation that I've never seen before regarding .exe and .dll files.
The app a.exe uses a DLL x.dll. The x.dll (not a COM DLL, but a regular one) can't be found in the computer hard drive.
After executing a.exe, the x.dll is expanded to the temp folder, to a path like this:
C:\DOCUME~1\COMPANY\LOCALS~1\Temp\tmpABT\07333f01-60fa-473c-9581-344d009b639d\x.dll
This DLL and path exists only during a.exe execution.
In the a.exe directory, there's a .CAB with a lot of DLLs, but x.dll is not inside of it.
The problem is that I have x.dll source code and I wanted to change it's version (used by a.exe).
Any tip on where does the DLL come from ?
Thanks for any help!
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Probably the executable has the x.DLL file stored as a resource within itself and is writing to the hard disk before usage?
However, you could use FileMon from SysInternals[^] to see who is creating the file!
“Follow your bliss.” – Joseph Campbell
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Yes, it has to be something like this.
I found something using process explorer, after choosing some menu item, the .exe loads an .msi file (yes, the .msi file is listed as loaded as the dlls are), and inside this .msi the is the x.dll.
Now I can use an .msi editor to change the dll inside of it.
Thanks Rajesh.
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I want to add a submenu at the end of 'Edit' Menu at run time at the time of dropdown of Edit menu.
What event I have to use for this purpose?
The submenu content may vary time to time, so I want to append it at the time of main Edit menu dropdown.
Thanks
--
"Programming is an art that fights back!"
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Is maybe WM_ENTERMENULOOP[^] what you are looking for?
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <
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Hi All
I have a problem to use syntax of MSSQL.I use this syntax
use databasename
it is not working for me.I check out through this code
SELECT db_name() then result show MASTER.
Can any one give me tips where i wrong to use syntax.
Plz help me
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I think this[^] is a better place for your question, this Message Board is for C/C++/MFC related questions.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <
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thanks for reply
i know this message board is for C/C++/MFC related questions.My question is also C/C++/MFC related questions because
USE DATABASENAME syntax working fine in MSSQL.When i use this sysntax in MFC/C++ then it's not working.So here i ask this question.
No problem if you think then i have to move from here to there.
Thanks
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I see, in this case, you should probably give some more details of how you tried to achieve your goal and what kind of problem/error did you get. Show some more code, maybe someone will know what is wrong.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <
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MsmVc wrote: My question is also C/C++/MFC related...
But you've shown no relevant code.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
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i connect MSSQL 2005 through this code successfuly.
CString str1="",str2="",str3="";
HRESULT hr;
if SUCCEEDED(hr = CoInitialize(NULL))
{
try
{
if (SUCCEEDED(spSQLServer.CreateInstance(__uuidof(SQLServer2))))
{
try
{
HOST=(_bstr_t)m_MHOST;
if(rad1.GetCheck())
{
spSQLServer->LoginSecure = TRUE;
spSQLServer->Connect((_bstr_t)m_MHOST);
}
else
{
spSQLServer->LoginSecure = FALSE;
spSQLServer->Connect((_bstr_t)m_MHOST,(_bstr_t)m_MUSR,(_bstr_t)m_MPWD);
}
}
catch(_com_error pCE)
{
str2.Format(_T("%s"),
MessageBox(str2,"Message");
return TRUE;
}
}
else
{
str3.Format(_T("Unable to create the SQL Server object.\n"));
}
}
catch(_com_error pCE)
{
str2.Format(_T("\n%s Error: %ld\r\n%s\r\n%s\r\n"),
(TCHAR*)pCE.Source(),
pCE.Error(),
(TCHAR*)pCE.Description(),
(TCHAR*)pCE.ErrorMessage());
}
}
else
{
str2.Format(_T("Call to CoInitialize failed.\n"));
}
Then i use this code for use database
QueryResultsPtr Qry;
_SQLServer2Ptr spSQLServer;
CString udata="use databasename";
Qry=spSQLServer->ExecuteWithResults((_bstr_t)udata,(LONG)udata.GetLength());
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fathers and mothers, how to convert hicon to png file?
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nenfa wrote: fathers and mothers
Fathers and Mothers are all on a break now, try Nieces and Nephews.
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they are playing now, how about you?
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Dear son, you may use GDI+.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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thanks, it's really a good programing tool
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