How to use function in dll file

hi
i am new to jni. i want use the function declared in the dll function. i am also having the .h header file.
can anybody please help me out with this?
thank you
suhas

What kind of function? Function with name created
with javah generated name or arbitrary function? In
first case load library and just use "function()", in
second case you should call something like "rundll"
under Windows or create wrapper to call from Java and
redirect call to DLL function itself.Thanks for the reply Michel,
Actually I have connected RFID 6500 module to PC through com port. and want send request for which module gives response.
The commands for the module are declared in FeCom.dll and also in FeCom.h. The definitions of the functions are given in FeComDef.h.
Now I get problem while accessing function in these files.
did you get the problem?
waiting for reply
Thank you,
suhas

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Subject:      How to Display User-Defined Cursors and Icons in Forms
Type:      BULLETIN
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     Content Type:      TEXT/X-HTML
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PURPOSE
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- how to display the cursor and the icon in Forms 6.0
SCOPE & APPLICATION
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and also in Visual C++ (or any other Win32 compiler).
A typical environment is Forms 6.0, Visual C++ 5.0 and Windows NT.
WHAT IS A RESOURCE ?
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cursors, menus, dialog boxes, keyboard-accelerator tables and much more.
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resource compiler in order to provide a .res file. These compiled resources
can then be appended to a binary executable file or a DLL.
For instance, Visual C++ 5.0 includes a resource editor which allows you to
draw your icons and your cursors, and store them in a resource file.
Part I - BUILDING A RESOURCE-ONLY DLL
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- mycur.cur: cursor file
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Step 1: Create a project
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tab and pick "Win32 Dynamic Link-Library". Fill the project name (e.g. Proj)
and the location (e.g. c:\MyProjects). Check 'Create new workspace', check
Win32 as target platform and click on OK.
This creates a directory c:\MyProjects\Proj, where necessary .rc and .cpp
files can be stored. Place the .ico and .cur files in this directory too.
Step 2: Add a resource file to the project
Create a proj.rc file, edit it and make sure it contains the following lines:
testcur CURSOR DISCARDABLE "mycur.cur"
testico ICON DISCARDABLE "myicon.ico"
This is the resource file. Using the Project->Add to Project->Files... menu,
select the proj.rc file and add it to the current project.
Step 3: Add a dummy C++ file to the project
Create a proj.cpp file, edit it and make sure it contains the following lines:
#include <windows.h>
extern "C"
BOOL WINAPI DllMain (HINSTANCE hInstance, DWORD dwReason, LPVOID)
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This creates an entry-point in the DLL. This function does nothing but is mandatory
to have a DLL after the build of the project.
Add the proj.cpp file to the project as described in Step 2.
Step 4: Choose the target type
At this moment, you can choose if you need a 'DEBUG' or a 'RELEASE' flavour of
the DLL. As there is not much to debug in this DLL, the 'RELEASE' flavour is
recommended. Furthermore, it is much more compact.
Using the Build->Set Active Configuration... menu, choose the Proj - Win32 Release
as the active configuration.
Step 5: Build the DLL
Now, it is time to compile the resource file, compile the C++ file, link both
together and build the proj.dll DLL. This operation is performed by using the
Build->Rebuild All menu.
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the Visual C++ message window. This means that the DLL was built successfully.
Step 6: Place the DLL in the appropriate directory
The proj.dll file is currently located under the c:\MyProjects\Proj\Release
directory. Copy it in an appropriate directory which is reachable in the
runtime environment path.
Part II - USING THE ICON AND CURSOR IN THE FORM
At this stage the DLL is created and can be used in the Form application.
Again, this is a multi-step procedure.
Step 1: Load the DLL in the Forms Runtime environment
Assuming the proj.dll DLL is placed in a directory pointed by the
PATH environment variable, below is the piece of PL/SQL code which loads
the DLL into the Forms Runtime environment. This code can be placed in the
WHEN-NEW-FORM-INSTANCE trigger for example:
declare
     hDLL     ORA_FFI.LIBHANDLETYPE;
begin break;
     --Preload the DLL so the cursor and Icons can be found.
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     hDLL := ORA_FFI.LOAD_LIBRARY(NULL,'proj.dll');
exception
     when ORA_FFI.FFI_ERROR then
          for i in 1..TOOL_ERR.NERRORS LOOP
               message(TOOL_ERR.MESSAGE(i));
          end LOOP;
end;
Step 2: Display the cursor stored in the DLL
Now, you may want to change the cursor when the user clicks on
a specific button. This is an example of code that could be set
in the WHEN-BUTTON-PRESSED trigger:
set_application_property(CURSOR_STYLE,'<proj>TESTCUR');
<proj> refers to the proj.dll. Please note the < and > signs
which are mandatory there. TESTCUR is the name of the cursor resource
as defined in the proj.rc file.
Step 3: Display the icon stored in the DLL
You may also want to change the icon of an iconic button after
some specific end-user action. The appropriate code for that is:
set_item_property('IBUTTON',ICON_NAME,'<proj>TESTICO');
IBUTTON is a PushButton, with the Iconic property set to Yes.
TESTICO is the name of the icon resource as defined in the proj.rc file.
Asim.

How to use function in dll file

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