大家好，又见面了，我是全栈君。
//dll内部封装API格式
//gzip BOOL 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); //zlib BOOL 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。
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