首先,我是一个JNA新手。我想通过java代码来控制我的主板的LED照明。华硕为此提供了一个用C (C++?)编写的软件开发工具包。
它们的头文件看起来很简单:
#pragma once
#include <Windows.h>
typedef void* MbLightControl;
typedef void* GPULightControl;
typedef void* ClaymoreKeyboardLightControl;
typedef void* RogMouseLightControl;
typedef DWORD(WINAPI* EnumerateMbControllerFunc)(MbLightControl handles[], DWORD size);
typedef DWORD(WINAPI* SetMbModeFunc) (MbLightControl handle, DWORD mode);
typedef DWORD(WINAPI* SetMbColorFunc) (MbLightControl handle, BYTE* color, DWORD size);
typedef DWORD(WINAPI* GetMbColorFunc) (MbLightControl handle, BYTE* color, DWORD size);
typedef DWORD(WINAPI* GetMbLedCountFunc)(MbLightControl handle);
typedef DWORD(WINAPI* EnumerateGPUFunc)(GPULightControl handles[], DWORD size);
typedef DWORD(WINAPI* SetGPUModeFunc) (GPULightControl handle, DWORD mode);
typedef DWORD(WINAPI* SetGPUColorFunc) (GPULightControl handle, BYTE* color, DWORD size);
typedef DWORD(WINAPI* GetGPULedCountFunc)(GPULightControl handle);
typedef DWORD(WINAPI* CreateClaymoreKeyboardFunc)(ClaymoreKeyboardLightControl* handle);
typedef DWORD(WINAPI* SetClaymoreKeyboardModeFunc) (ClaymoreKeyboardLightControl handle, DWORD mode);
typedef DWORD(WINAPI* SetClaymoreKeyboardColorFunc) (ClaymoreKeyboardLightControl handle, BYTE* color, DWORD size);
typedef DWORD(WINAPI* GetClaymoreKeyboardLedCountFunc)(ClaymoreKeyboardLightControl handle);
typedef DWORD(WINAPI* CreateRogMouseFunc)(RogMouseLightControl* handle);
typedef DWORD(WINAPI* SetRogMouseModeFunc) (RogMouseLightControl handle, DWORD mode);
typedef DWORD(WINAPI* SetRogMouseColorFunc) (RogMouseLightControl handle, BYTE* color, DWORD size);
typedef DWORD(WINAPI* RogMouseLedCountFunc)(RogMouseLightControl handle);
我使用JNAerator获取JNA映射,结果如下所示:
import com.ochafik.lang.jnaerator.runtime.LibraryExtractor;
import com.ochafik.lang.jnaerator.runtime.MangledFunctionMapper;
import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.NativeLibrary;
import com.sun.jna.Pointer;
import com.sun.jna.ptr.PointerByReference;
import com.sun.jna.win32.StdCallLibrary.StdCallCallback;
public interface Aura extends Library {
String JNA_LIBRARY_NAME = LibraryExtractor.getLibraryPath("AURA_SDK", true, Aura.class);
NativeLibrary JNA_NATIVE_LIB = NativeLibrary.getInstance(Aura.JNA_LIBRARY_NAME, MangledFunctionMapper.DEFAULT_OPTIONS);
Aura INSTANCE = (Aura) Native.loadLibrary(Aura.JNA_LIBRARY_NAME, Aura.class, MangledFunctionMapper.DEFAULT_OPTIONS);
interface EnumerateMbControllerFunc extends StdCallCallback {
int apply(PointerByReference handles, int size);
}
interface SetMbModeFunc extends StdCallCallback {
int apply(Pointer handle, int mode);
}
interface SetMbColorFunc extends StdCallCallback {
int apply(Pointer handle, Pointer color, int size);
}
interface GetMbColorFunc extends StdCallCallback {
int apply(Pointer handle, Pointer color, int size);
}
interface GetMbLedCountFunc extends StdCallCallback {
int apply(Pointer handle);
}
interface EnumerateGPUFunc extends StdCallCallback {
int apply(PointerByReference handles, int size);
}
interface SetGPUModeFunc extends StdCallCallback {
int apply(Pointer handle, int mode);
}
interface SetGPUColorFunc extends StdCallCallback {
int apply(Pointer handle, Pointer color, int size);
}
interface GetGPULedCountFunc extends StdCallCallback {
int apply(Pointer handle);
}
interface CreateClaymoreKeyboardFunc extends StdCallCallback {
int apply(PointerByReference handle);
}
interface SetClaymoreKeyboardModeFunc extends StdCallCallback {
int apply(Pointer handle, int mode);
}
interface SetClaymoreKeyboardColorFunc extends StdCallCallback {
int apply(Pointer handle, Pointer color, int size);
}
interface GetClaymoreKeyboardLedCountFunc extends StdCallCallback {
int apply(Pointer handle);
}
interface CreateRogMouseFunc extends StdCallCallback {
int apply(PointerByReference handle);
}
interface SetRogMouseModeFunc extends StdCallCallback {
int apply(Pointer handle, int mode);
}
interface SetRogMouseColorFunc extends StdCallCallback {
int apply(Pointer handle, Pointer color, int size);
}
interface RogMouseLedCountFunc extends StdCallCallback {
int apply(Pointer handle);
}
}
在示例C++代码中,它们使用GetProcAddress来获取上述方法的地址,这样它们就可以调用它们:
HMODULE hLib = nullptr;
hLib = LoadLibraryA("AURA_SDK.dll");
(FARPROC&)EnumerateMbController = GetProcAddress(hLib, "EnumerateMbController");
DWORD _count = EnumerateMbController(NULL, 0);
如何使用JNA执行相同的操作?
提前谢谢。
发布于 2018-05-31 18:14:51
我不知道为什么头文件看起来是这样的,但是基于您提供的C示例,驻留在库AURA_SDK中的函数EnumerateMbController是用两个参数调用的-第一个参数是MbLightControl数组(这些是不透明的指针),第二个参数表示“大小”。
我会从上下文中推断出:
带NULL的调用表明,它将返回它将返回的MbLightControl实例的数量。
我对正确绑定的建议是:
public interface Aura extends StdCallLibrary {
Aura INSTANCE = Native.loadLibrary("AURA_SDK", Aura.class, W32APIOptions.DEFAULT_OPTIONS);
public static class MbLightControl extends WinDef.PVOID {}
public int EnumerateMbController(MbLightControl[] handles, int size);
public int SetMbMode(MbLightControl handle, int mode);
public int SetMbColor(MbLightControl handle, byte[] color, int size);
public int GetMbColor(MbLightControl handle, byte[] color, int size);
public int GetMbLedCount(MbLightControl handle);
}
这将加载名为AURA_SDK的动态链接库,并使五个函数可以访问。它还模仿MbLightControl的头文件中的类型定义。DWORD_s被绑定为java int以便于调用,因为java中的_int始终是32位的,而Windows上的DWORD值是相同的。
我不知道颜色代码的细节,但如果这些是RGB LED,那么我假设每个LED将占用字节数组中的3个字节。
它可能有助于了解,在幕后,JNA使用LoadLibraryEx (LoadLibrary的大哥)和GetProcAddress来加载函数。
https://stackoverflow.com/questions/50620781
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