.net 2003 调用c++.dll

[myminimouse]

头文件

#ifdef a
#define b_API __declspec(dllexport)
#else
#define b_API __declspec(dllimport)
#endif

extern "C"
{

b_API int __stdcall ZlibCompress(unsigned char **compr, unsigned long *comprLen, unsigned char *uncompr, unsigned long uncomprLen);

b_API int __stdcall ZlibUncompress(unsigned char *compr, unsigned long comprLen, unsigned char **uncompr, unsigned long *uncomprLen);

}

请大家帮忙，谢谢了

[zenowolf]

Marshal 下有很多类 可以参照下。。。

[li365941471]

bang ding

[sportTony]

[Quote=引用 5 楼 li365941471 的回复:]
bang ding
[/Quote]
1

[problc]

平台调用吧 P/Invoke...

[wujinjian2008n]

[Quote=引用 5 楼 li365941471 的回复:]
bang ding
[/Quote]

2

[myminimouse]

我先试一下
谢谢ChrisAK

[cnzdgs]

unsigned char **这种类型一般只在返回指针时才使用，数据压缩应该是不需要返回指针的，该不会是多写了个*吧？

[ChrisAK]

[Quote=引用 10 楼 cnzdgs 的回复:]
unsigned char **这种类型一般只在返回指针时才使用，数据压缩应该是不需要返回指针的，该不会是多写了个*吧？
[/Quote]说不定.如果它是被调用方来分配内存的话就可能是unsigned char **了

[zcandyly20211]

友情up！

[bell49]

使用unsafe

[ChrisAK]

没dll名,
没参数说明...
只能靠猜的写一下了:

unsafe static extern int ZlibCompress(out byte* compr,ref uint comprLen, byte[] uncompr, uint uncomprLen);
unsafe static extern int ZlibUncompress(byte[] compr, uint comprLen, out byte *uncompr, ref uint uncomprLen);

LZ自己把DllImport补下.
另外如果不能用unsafe只要把byte*换成IntPtr改用Marshal操作指针就行了.

[myminimouse]

还是不行。。。

[myminimouse]

#ifdef GPSSUPPORT_EXPORTS
#define GPSSUPPORT_API __declspec(dllexport)
#else
#define GPSSUPPORT_API __declspec(dllimport)
#endif



extern "C"
{

GPSSUPPORT_API int __stdcall ZlibCompress(unsigned char **compr, unsigned long *comprLen, unsigned char *uncompr, unsigned long uncomprLen);

GPSSUPPORT_API int __stdcall ZlibUncompress(unsigned char *compr, unsigned long comprLen, unsigned char **uncompr, unsigned long *uncomprLen);
}

整个代码就是这样的

[soaringbird]

unsigned char ** ----byte**
unsigned char * -----byte*
unsigned long * -----uint* 或者 ref uint

[DllImport("xxxx.dll",CallingConvention=CallingConvention.StdCall)]