Using JNI to call MS Windows API functions

[ali honarmand]

hi all!
for last few days I'm working on calling "user32.dll" functions from Java(I need it). I have progressed but have not succeeded yet. the first sample I'm working on is a self created .dll file but i have problems creating .dll file using cl.exe. while calling happens what follows:
>cl HelloWorld..c -IC:\Program Files\Java\jdk1.6.0_10\include -fehello.dll -MD -
LD
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 15.00.21022.08 for 80x86
Copyright (C) Microsoft Corporation. All rights reserved.

cl : Command line warning D9002 : ignoring unknown option '-fehello.dll'
cl : Command line warning D9024 : unrecognized source file type 'Files\Java\jdk1
.6.0_10\include', object file assumed
HelloWorld..c
HelloWorld..c(1) : fatal error C1083: Cannot open include file: 'jni.h': No such
file or directory

and secondly I wonder how to call a"user32.dll" file from java.

thanks

[Rob Spoor]

You need to put quotes around your include path, because the command line shell now sees it as two different arguments. Try one of the following:
"-IC:\Program Files\Java\jdk1.6.0_10\include"
-I"C:\Program Files\Java\jdk1.6.0_10\include"

I think it should be the first one but I haven't tried it out.

[ali honarmand]

Rob Prime wrote:You need to put quotes around your include path, because the command line shell now sees it as two different arguments. Try one of the following:
"-IC:\Program Files\Java\jdk1.6.0_10\include"
-I"C:\Program Files\Java\jdk1.6.0_10\include"

I think it should be the first one but I haven't tried it out.

Hi Rob, Thanks, It works and the dll file is created in accompany with some other files like filename.exp, filename.obj, and etc. but while using it in my app I face this message:
java.lang.UnsatisfiedLinkError: C:\Program Files\Java\jdk1.6.0_10\include\HelloWorld..dll: Can't find dependent libraries
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(Unknown Source)
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at HelloWorld.<clinit>(HelloWorld.java:19)
a message appears and the exception is thrown:
Exception in thread "main"

what are dependent libraries?

[ali honarmand]

Rob Prime wrote:You need to put quotes around your include path, because the command line shell now sees it as two different arguments. Try one of the following:
"-IC:\Program Files\Java\jdk1.6.0_10\include"
-I"C:\Program Files\Java\jdk1.6.0_10\include"

I think it should be the first one but I haven't tried it out.

Something I want to say, when cl is used for MS Windows native dlls a .exe file will be created, even if you have no errors. according to documents from sun: "Static or archive libraries are compiled into an executable and cannot be loaded at runtime".