[英]Convert a member of structure of type signed char * to byte array in Java (byte[]) using SWIG
I'm trying to convert a member of structure of type signed char * to byte array in Java. 我正在尝试将signed char *类型的结构成员转换为Java中的字节数组。 I've the following structure: 我有以下结构:
typedef struct {
signed char * content;
int contentLength;
} Foo;
I've tried this: 我试过这个:
%typemap(jni) signed char *content [ANY] "jbyteArray"
%typemap(jtype) signed char *content [ANY] "byte[]"
%typemap(jstype) signed char *content [ANY] "byte[]"
%typemap(javaout) signed char *content [ANY] {
return $jnicall;
}
%typemap(memberin) int contentLength [ANY] {
int length=0;
$1 = &length;
}
%typemap(out) signed char * content [ANY] {
$result = JCALL1(NewByteArray, jenv, length);
JCALL4(SetByteArrayRegion, jenv, $result, 0, length, $1);
}
But there isn't a result. 但没有结果。 The method getContent of the Foo have the following signature: Foo的方法getContent具有以下签名:
SWIGTYPE_p_signed_char getContent();
I want this method to returns byte[]. 我希望这个方法返回byte []。 Is there a solution? 有解决方案吗?
That's pretty close to what you want. 那非常接近你想要的。 You don't want the [ANY]
since the size of the array is not "fixed" in C (it's specified by an int
, but that's not part of its type). 您不需要[ANY]
因为数组的大小不是在C中“固定”(它由int
指定,但这不是其类型的一部分)。
You can make your typemap work with: 您可以使您的typemap适用于:
%module test
%typemap(jni) signed char *content "jbyteArray"
%typemap(jtype) signed char *content "byte[]"
%typemap(jstype) signed char *content "byte[]"
%typemap(javaout) signed char *content {
return $jnicall;
}
%typemap(out) signed char * content {
$result = JCALL1(NewByteArray, jenv, arg1->contentLength);
JCALL4(SetByteArrayRegion, jenv, $result, 0, arg1->contentLength, $1);
}
// Optional: ignore contentLength;
%ignore contentLength;
%inline %{
typedef struct {
signed char * content;
int contentLength;
} Foo;
%}
I might be missing something here, but I can't see a better way of getting hold of the "self" pointer from within an out typemap than this - arg$argnum
doesn't work and neither does $self
. 我可能在这里遗漏了一些东西,但是我看不出更好的方法是从out类型arg$argnum
中获取“self”指针而不是这个 - arg$argnum
不起作用,也不是$self
。 There aren't any other typemaps that get applied to this function that would help. 没有任何其他类型映射可以应用于此功能,这将有所帮助。
(Note you probably also want to write a memberin for signed char * content
or make it immutable. I'd be tempted to %ignore
the contentLength
member entirely too). (注意,您可能还想为signed char * content
编写一个memberin或使其成为不可变的。我很想完全%ignore
contentLength
成员)。
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