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10 messages in net.java.dev.jna.usersRe: [jna-users] Using custom librarie...| From | Sent On | Attachments |
|---|---|---|
| Jorge Nieto-Madrid | Jan 7, 2009 4:14 am | |
| Timothy Wall | Jan 7, 2009 5:38 am | |
| Jorge Nieto-Madrid | Jan 7, 2009 5:55 am | |
| Timothy Wall | Jan 7, 2009 7:08 am | |
| Jorge Nieto-Madrid | Jan 7, 2009 8:04 am | |
| Timothy Wall | Jan 7, 2009 8:09 am | |
| Jorge Nieto-Madrid | Jan 7, 2009 8:24 am | |
| Timothy Wall | Jan 7, 2009 12:15 pm | |
| Jorge Nieto-Madrid | Jan 8, 2009 6:36 am | |
| Timothy Wall | Jan 8, 2009 6:47 am |
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| Subject: | Re: [jna-users] Using custom libraries (dll) | Actions... |
|---|---|---|
| From: | Timothy Wall (twal...@dev.java.net) | |
| Date: | Jan 7, 2009 7:08:43 am | |
| List: | net.java.dev.jna.users | |
On Jan 7, 2009, at 8:56 AM, Jorge Nieto-Madrid wrote:
Thank you so much Timothy for your fast response. I used depends.exe to see the names of the functions and did just as you said. Now I found in the documentation (for Saphira). That the library defines a struct variable "sfRobot" used a s a state reflection of a robot to read its position and velocity and and integer "sfIsConnected" to determine the connection between robot and client PC. I used this in my C programs and it worked like this:
int v, w, x, y; v = sfRobot.v; w = sfRobot.w; x = sfRobot.ax; y = sfRobot.ay;
if(sfIsConnected) { //do something; }
As I said, sfRobot and sfIsConnected are variables defined by the DLL. As you know, Interfaces in Java allow to declare constants and functions only. How can I declare thiese variables in JNA? I would really appreciate your help.
NativeLibrary.getGlobalVariableAddress(String) provides you with a Pointer, which is the address of the variable.
boolean sfIsConnected() { // assumes sfIsConnected is a 32-bit value return Saphira.INSTANCE.getGlobalVariableAddress('sfIsConnected').getInt(0); }
As for the robot, you need to define the structure in java and use Structure.useMemory() with the variable's address followed by a Structure.read(). The Structure address is probably at getGlobalVariableAddress('sfRobot').getPointer(0).
PS. Is it allowed to write the full path of a dll in LoadLibrary, like: Saphira INSTANCE = (Saphira)Native.loadLibrary("C:\\Saphira\\VER62\ \BIN\\SH", Saphira.class);
You *can*, but you shouldn't.
Instead, do
java -Djna.library.path=c:/saphira/ver62/bin/sh ...
Thank you in advance.
Timothy Wall schrieb:
On Jan 7, 2009, at 7:15 AM, Jorge Nieto-Madrid wrote:
Hi Timothy,
I stopped using JNA for a while. Now I started using it again and have a trivial question: How do I declare an interface for Non- native/Custom DLLs?
I know that for all DLLs in C:\windows\system32 I must just extend StdCallLibrary, like in this code snipset (for Kernel32.dll):
public interface Kernel32 extends StdCallLibrary { // Method declarations, constant and structure definitions go here Kernel32 INSTANCE = (Kernel32) Native.loadLibrary("kernel32", Kernel32.class, W32API.DEFAULT_OPTIONS); // Optional: wraps every call to the native library in a // synchronized block, limiting native calls to one at a time Kernel32 SYNC_INSTANCE = (Kernel32) Native.synchronizedLibrary(INSTANCE); .......
So the vital part is: Native.loadLibrary("kernel32", Kernel32.class, W32API.DEFAULT_OPTIONS);
Lets assume I have the library Saphira.dll in the path C:\Spahira\
How can define interface for it??
You can use depends.exe to examine the contents of the library (function names). If you have a C header for it, that will tell you whether it uses the stdcall or c calling convention. You can probably omit the options to the loadLibrary call. You should put the dll in your PATH or in java.library.path, or in jna.library.path.
Native.loadLibrary("Saphira", Saphira.class)