[java] Using DLL

Hi.

To load a dll, look at the methods System.load and System.loadLibrary.

You'll need to create a JNI wrappers to call the methods in the dll properly.

As for the HBitmap, (I dont know what it specifically contains), - you'll probably have to reconstruct it. I've done this with other structs/classes. You have to do some research, find out exactly how HBitmap is constructed, and then replicate it in java. Make sure you consider unsigned vs signed values etc. Then you can use your replicated class as input/output in both your jni methods, and your basic java methods.

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Original post by Addictman To load a dll, look at the methods System.load and System.loadLibrary.

Yes, i have done that.

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Original post by Addictman You'll need to create a JNI wrappers to call the methods in the dll properly.

Sh*t, i was afraid of this, is there another way?
(If i understood correctly, you mean to write methods in java with "native" keywords, then using javah make headers, and write code in C/C++ that actually loads the DLL and calls it functions?)

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Original post by Addictman As for the HBitmap, (I dont know what it specifically contains), - you'll probably have to reconstruct it.

Again, sh*t :)

So, there's no way to load DLL without a wrapper?
How does, for example, JLWGL uses OpenGL32.dll ? Does it use a wrapper DLL to "talk" to OpenGL32.dll ?

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Original post by Jnz86 Quote: Original post by Addictman You'll need to create a JNI wrappers to call the methods in the dll properly. Sh*t, i was afraid of this, is there another way? (If i understood correctly, you mean to write methods in java with "native" keywords, then using javah make headers, and write code in C/C++ that actually loads the DLL and calls it functions?) Quote: Original post by Addictman As for the HBitmap, (I dont know what it specifically contains), - you'll probably have to reconstruct it. Again, sh*t :) So, there's no way to load DLL without a wrapper? How does, for example, JLWGL uses OpenGL32.dll ? Does it use a wrapper DLL to "talk" to OpenGL32.dll ?

If you want to use JNI, you have to create wrappers. However, you don't have to create them manually. Write the class with the native methods, then compile the class with javac. Then, when you have your .class file, run that through javah. This will create your header files. Its up to you to create the .c files to accompany them.

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Original post by aidan_walsh Quote: Original post by Jnz86 Quote: Original post by Addictman You'll need to create a JNI wrappers to call the methods in the dll properly. Sh*t, i was afraid of this, is there another way? (If i understood correctly, you mean to write methods in java with "native" keywords, then using javah make headers, and write code in C/C++ that actually loads the DLL and calls it functions?) Quote: Original post by Addictman As for the HBitmap, (I dont know what it specifically contains), - you'll probably have to reconstruct it. Again, sh*t :) So, there's no way to load DLL without a wrapper? How does, for example, JLWGL uses OpenGL32.dll ? Does it use a wrapper DLL to "talk" to OpenGL32.dll ? If you want to use JNI, you have to create wrappers. However, you don't have to create them manually. Write the class with the native methods, then compile the class with javac. Then, when you have your .class file, run that through javah. This will create your header files. Its up to you to create the .c files to accompany them.

Yes, i know that.
Well, thanks.