我试图从DLL D2D1.dll映射函数D2D1CreateFactory。从那里我想创建一个Direct2D Java映射,但这是无关紧要的。我至今有这样的:来自D2D1的Java JNA映射D2D1CreateFactory
public WinNT.HRESULT D2D1CreateFactory(int factoryType, REFIID riid, ID2D1Factory.ByReference ppIFactory);
的ID2D1Factory看起来是这样的:
public class ID2D1Factory extends IUnknown {
public ID2D1Factory() { }
public ID2D1Factory(Pointer pvInstance) {
super(pvInstance);
}
}
当我尝试使用下面的代码来运行我的代码,“java.lang.Error的:无效的内存访问”是抛出(打开JNA.setProtected()时)。
的代码运行:
ID2D1Factory.ByReference ref= new ID2D1Factory.ByReference();
D2D1.INSTANCE.D2D1CreateFactory(0, new REFIID(new IID("06152247-6f50-465a-9245-118bfd3b6007").toByteArray()), ref);
我不知道为什么。有什么我做错了吗?
编辑:感谢technomage我能够得到正确的方法声明。该方法应该声明如下:
public WinNT.HRESULT D2D1CreateFactory(int factoryType, REFIID riid, D2D1_FACTORY_OPTIONS opts, PointerByReference pref);
的D2D1_FACTORY_OPTIONS结构映射如下:
public static class D2D1_FACTORY_OPTIONS extends Structure {
public int debugLevel;
protected List<String> getFieldOrder() {
return Arrays.asList(new String[] { "debugLevel" });
}
public D2D1_FACTORY_OPTIONS() {}
public D2D1_FACTORY_OPTIONS(int size) {
super(new Memory(size));
}
public D2D1_FACTORY_OPTIONS(Pointer memory) {
super(memory);
read();
}
}
最后,该代码段调用的方法:
D2D1_FACTORY_OPTIONS opts = new D2D1_FACTORY_OPTIONS();
PointerByReference pp = new PointerByReference();
D2D1.INSTANCE.D2D1CreateFactory(0, new REFIID(new IID("06152247-6f50-465a-9245-118bfd3b6007").toByteArray()), opts, pp);
非常感谢。我会试试这个结果并回来告诉其他用户。 – 2013-03-25 18:53:08