.net 2003 调用c++.dll

Question

头文件#ifdef a
#define b_API __declspec(dllexport)
#else
#define b_API __declspec(dllimport)
#endifextern "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

Answer 1

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.

Answer 2

Marshal  下有很多类 可以参照下

Answer 3

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？

Answer 4

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

Answer 5

#ifdef GPSSUPPORT_EXPORTS
#define GPSSUPPORT_API __declspec(dllexport)
#else
#define GPSSUPPORT_API __declspec(dllimport)
#endifextern "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

Answer 6

unsigned char ** ----byte**
unsigned char * -----byte*
unsigned long * -----uint* 或者 ref uint[DllImport("xxxx.dll",CallingConvention=CallingConvention.StdCall)]