java JNA 结构和指针映射
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JNA Struct and Pointer mapping
提问by Brian
How does one map the function below to java?
如何将下面的函数映射到java？
VOID WriteToStruct(BOOL *Status, STRUCT_MSG RecBuff)
VOID WriteToStruct(BOOL *Status, STRUCT_MSG RecBuff)
What this function does:
1) Populates the struct RecBuff
2) Updates status
此函数的作用：
1) 填充结构 RecBuff
2) 更新状态
How do I map to a boolean pointer in Java and access the struct data updated by the function?
如何映射到 Java 中的布尔指针并访问由函数更新的结构数据？
回答by Brian
I was searching for another issue concerning JNA and structs, and Google redirected me here. I hope this helps.
我正在寻找关于 JNA 和结构的另一个问题，谷歌将我重定向到这里。我希望这有帮助。
From JNA API
来自JNA API
To pass a structure by value, first define the structure, then define an empty class from that which implements Structure.ByValue. Use the ByValue class as the argument or return type.
// Original C code typedef struct _Point { int x, y; } Point; Point translate(Point pt, int dx, int dy); // Equivalent JNA mapping class Point extends Structure { public static class ByValue extends Point implements Structure.ByValue { } public int x, y; } Point.ByValue translate(Point.ByValue pt, int x, int y); ... Point.ByValue pt = new Point.ByValue(); Point result = translate(pt, 100, 100);
要按值传递结构，首先定义结构，然后从实现 Structure.ByValue 的类中定义一个空类。使用 ByValue 类作为参数或返回类型。
// Original C code typedef struct _Point { int x, y; } Point; Point translate(Point pt, int dx, int dy); // Equivalent JNA mapping class Point extends Structure { public static class ByValue extends Point implements Structure.ByValue { } public int x, y; } Point.ByValue translate(Point.ByValue pt, int x, int y); ... Point.ByValue pt = new Point.ByValue(); Point result = translate(pt, 100, 100);
回答by Brian
You can use the ByReference class to pass values by reference. Presuming BOOL is an int you can use IntegerByReference.
您可以使用 ByReference 类通过引用传递值。假设 BOOL 是一个整数，您可以使用 IntegerByReference。
