zlib在windows上的编译

最新推荐文章于 2024-12-08 12:49:01 发布

转载最新推荐文章于 2024-12-08 12:49:01 发布 · 577 阅读

本文详细介绍了如何使用Zlib库对文件进行压缩和解压缩操作，包括文件大小读取、内存分配、压缩与解压缩过程以及内存释放。

from:

http://blog.sina.com.cn/s/blog_96ea53fb0101ldd9.html

http://blog.youkuaiyun.com/yuzhiyuxia/article/details/25826639

http://blog.youkuaiyun.com/htttw/article/details/7616124

首先从http://www.zlib.net/下载了最新的源代码，版本是1.2.8

解压后，实际已经提供了在VC下编译的工程，目录为：
zlib-1.2.8\contrib\vstudio
其中只有vc9和vc10
编译

直接使用其库，下载zlib128-dll，里面有.LIB, .DLL, .H文件

导入到自己的工程

//解压文件

  CFile bmpFile(_T("C:\\dh_255.bmp"), CFile::modeRead|CFile::typeBinary);
unsigned long lSize = bmpFile.GetLength();
CString strSize;
strSize.Format(_T("%8x"), lSize); // 文件大小
unsigned long lSizeDest = lSize;
if (lSize > 0)
{
  BYTE* pBufSrc = new BYTE[lSize];
  memset(pBufSrc, 0, lSize);
  BYTE* pBufDest = new BYTE[lSizeDest];
  memset(pBufDest, 0, lSizeDest);
  bmpFile.Read(pBufSrc, lSize);

  INT_PTR iComp = compress(pBufDest, &lSizeDest, pBufSrc, lSize);
  CFile zipFile(_T("C:\\dh_255.zip"), CFile::modeCreate|CFile::modeWrite|CFile::typeBinary);
  std::string str;
  WCToStr(strSize, str);
  zipFile.Write(str.c_str(), strSize.GetLength() + 1);// 存储解压之后的文件大小
  zipFile.Seek(9+1, CFile::begin);
  zipFile.Write(pBufDest, lSizeDest);
  delete [] pBufDest;
  pBufDest = NULL;
  delete [] pBufSrc;
  pBufSrc = NULL;
  zipFile.Close();
}
bmpFile.Close();
///* 解压缩 */
CFile zipFile(_T("C:\\dh_255.zip"), CFile::modeRead|CFile::typeBinary);
unsigned long lZipSrc = zipFile.GetLength();
unsigned long lZipDest = lSize+ 10;
BYTE* pBufZip = new BYTE[lZipSrc];

BYTE* pBufSize = new BYTE[9];
memset(pBufZip, 0, lZipSrc);

memset(pBufSize, 0, 9);
zipFile.Read(pBufSize, 9);//////读取解压之后的文件大小
unsigned long lSizenew = strtoul((const char*)pBufSize, 0, 16);
BYTE* pBufBmp = new BYTE[lSizenew];
memset(pBufBmp, 0, lSizenew);
zipFile.Seek(9+1, CFile::begin);
zipFile.Read(pBufZip, lZipSrc);

INT_PTR iUnComp = uncompress(pBufBmp, &lSizenew, pBufZip, lZipSrc);
CFile destBmpFile(_T("C:\\dh_2550.bmp"), CFile::modeCreate|CFile::modeWrite|CFile::typeBinary);
destBmpFile.Write(pBufBmp, lSizenew);
delete [] pBufZip;
pBufZip = NULL;
zipFile.Close();
destBmpFile.Close();

//压缩数据

//* 原始数据 */
unsigned char strSrc[] = "hello world! aaaaa bbbbb ccccc ddddd 中文测试 yes";
unsigned char buf[1024] = {0};
unsigned char strDst[1024] = {0};
unsigned long srcLen = sizeof(strSrc);
unsigned long bufLen = sizeof(buf);
unsigned long dstLen = sizeof(strDst);

//* 压缩 */
compress(buf, &bufLen, strSrc, srcLen);
//

//* 解压缩 */
uncompress(strDst, &dstLen, buf, bufLen);
//* 压缩 */