上面的User32定义的是dll库文件,有时会碰到比如HANDLE、POINT、WORD和MSG等数据类型,有些数据类型JNA中没有提供,需要自己定义,根据作用的不同,定义的时候继承的父类也不一样,比如HANDLE定义方法是:
CODE:class HANDLE extends PointerType {
private boolean immutable;
public HANDLE() { }
public HANDLE(Pointer p) { setPointer(p); immutable = true; }
public Object fromNative(Object nativeValue, FromNativeContext context) {
Object o = super.fromNative(nativeValue, context);
if (INVALID_HANDLE_VALUE.equals(o))
return INVALID_HANDLE_VALUE;
return o;
}
public void setPointer(Pointer p) {
if (immutable)
throw new UnsupportedOperationException("immutable reference");
super.setPointer(p);
}
}
添加进工程时 ,还未编译,,应该是代码语法检查时
if (INVALID_HANDLE_VALUE.equals(o))
return INVALID_HANDLE_VALUE;在这个地方提示错误:
为找到的符号:INVALID_HANDLE_VALUE
是啥毛病呢?
CODE:class HANDLE extends PointerType {
private boolean immutable;
public HANDLE() { }
public HANDLE(Pointer p) { setPointer(p); immutable = true; }
public Object fromNative(Object nativeValue, FromNativeContext context) {
Object o = super.fromNative(nativeValue, context);
if (INVALID_HANDLE_VALUE.equals(o))
return INVALID_HANDLE_VALUE;
return o;
}
public void setPointer(Pointer p) {
if (immutable)
throw new UnsupportedOperationException("immutable reference");
super.setPointer(p);
}
}
添加进工程时 ,还未编译,,应该是代码语法检查时
if (INVALID_HANDLE_VALUE.equals(o))
return INVALID_HANDLE_VALUE;在这个地方提示错误:
为找到的符号:INVALID_HANDLE_VALUE
是啥毛病呢?
解决方案 »
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