//dll内部封装API格式

//gzipBOOL  fnZlibDecompressPacket(__IN_PARAM unsigned char* gZlibDataBuffer, __IN_PARAM size_t gZLibDataLength,__OUT_PARAM char* pChDataBuffer,__OUT_PARAM DWORD *pdwLength);BOOL  fnZlibCompressPacket(__IN_PARAM unsigned char* gZlibDataBuffer, __IN_PARAM size_t gZLibDataLength,__OUT_PARAM char * pchGzipOutData,__OUT_PARAM DWORD *pdwLength);//zlibBOOL fnGzipDecompressPacket(__IN_PARAM unsigned char* gzipDataBuffer,__IN_PARAM size_t gzipDataBuffer_Length, __OUT_PARAM char* pChDataBuffer,__OUT_PARAM DWORD *pdwLength);BOOL fnGzipCompressPacket(__IN_PARAM const char * gzipDataBuffer,__IN_PARAM int gzipDataBuffer_Length,__OUT_PARAM char * dstDataBuffer, __OUT_PARAM int *pdwLength);

//GZIP调用核心代码演示

typedef  BOOL   (*UncompressionGzipPacketToBuffer)(unsigned char* gZipDataBuffer,  size_t gZipDataLength, char * pDataBuffer,DWORD *dwLength);typedef  BOOL   (*CompressionBufferPacketToGzip)( unsigned char* chDataBuffer,  size_t chDataLength, char* pGzipBuffer,DWORD *dwLength);HINSTANCE hInst=NULL;    UncompressionGzipPacketToBuffer UngzipPacket;    CompressionBufferPacketToGzip   ComGzipBuffer;    hInst=LoadLibrary(_T("GzipZlibdll.dll"));    if (hInst==NULL){    return -1;} UngzipPacket=(UncompressionGzipPacketToBuffer)GetProcAddress(hInst,"fnGzipDecompressPacket");ComGzipBuffer=(CompressionBufferPacketToGzip)GetProcAddress(hInst,"fnGzipCompressPacket");   if (UngzipPacket==NULL)    {        return -1; } if (ComGzipBuffer==NULL){        return -1;    }  BOOL bRet=UngzipPacket((unsigned char*)pChGzipBuff,dwReaded,pChDataBuff,&dwTransferSize);//注意此处dwGzipSize的必须有值，不能传递0考虑到压缩之后一定比原来数据小。传递dwTransferSize大小就可以BOOL bReturn=ComGzipBuffer((unsigned char*)pChDataBuff,dwTransferSize,pChGzipBuff,&dwGzipSize);FreeLibrary(hInst);

//zlib同上演示样例。