zlib__ZC

官网：http://www.zlib.net/ ，所有版本下载：http://www.zlib.net/fossils/

ZC: 我下载的是 zlib-1.2.3.tar.gz 和 zlib-1.2.11.tar.gz(20170626当前最新版)

ZC: 我是看的一个网上的教程，具体文章不知道是哪个了...

ZC: zlib-1.2.3.tar.gz的编译方法是进入目录“...zlib-1.2.3projectsvisualc6”，用VC6打开 zlib.dsw，然后进行编译。最主要需要这3个文件：zlib.h、zconf.h、zlib.lib 。

ZC: zlib-1.2.11.tar.gz的编译方法是看了“README”知道的...(方式一):进入目录“...zlib-1.2.11win32”用命令行编译 (方式二):进入目录“...contribvstudio...” 选择对应版本的VS目录然后进行编译 (我没有实际使用 zlib-1.2.11.tar.gz 进行编译和编码...)

zlib-1.2.3.tar.gz 的测试使用代码：

#include <stdio.h>
#include <windows.h>

#include "zlib.h"
#pragma comment(lib,"zlib")  

void main()
{
    HANDLE pfile=::CreateFile("C:\111.bmp",GENERIC_READ,0,NULL,OPEN_EXISTING,
        FILE_ATTRIBUTE_NORMAL|FILE_FLAG_BACKUP_SEMANTICS,NULL);//用这个函数比OpenFile好
    if(pfile==INVALID_HANDLE_VALUE)
    {
        MessageBox(NULL,"打开文件失败","Error",MB_OK);
        CloseHandle(pfile);//一定注意在函数退出之前对句柄进行释放。
        return;
    }
    DWORD filesize = GetFileSize(pfile,NULL);
    char* buffer = new char[filesize+1];//最后一位为'/0',C-Style字符串的结束符。
    DWORD readsize = 0;
    ReadFile(pfile,buffer,filesize,&readsize,NULL);

    DWORD dwTick1 = ::GetTickCount();
    //printf("filesize : %d, ::GetTickCount() : %d
", filesize, dwTick1);

//*
    //压缩  
    BYTE *dest = new BYTE[filesize];
    unsigned long destSize = filesize;
    //Z_OK
    int iRtn = compress(dest, &destSize, (unsigned char*)buffer, filesize);
//#define Z_BUF_ERROR    (-5)
    printf("iRtn : %d
", iRtn);
    printf("destSize : %d, ::GetTickCount() : %d
", destSize, ::GetTickCount());
//*/
//#define Z_NO_COMPRESSION         0
//#define Z_BEST_SPEED             1
//#define Z_BEST_COMPRESSION       9
//#define Z_DEFAULT_COMPRESSION  (-1)


// ***
//*
    // 解压
    unsigned long nSize = 1024*40000;
    BYTE *target=new BYTE[nSize];
    iRtn = uncompress(target, &nSize, dest, destSize);

    printf("iRtn : %d
", iRtn);
    printf("nSize : %d, ::GetTickCount() : %d
", nSize, ::GetTickCount());
//*/

//*
    HANDLE pWfile=::CreateFile("C:\z01.bmp",GENERIC_WRITE|GENERIC_READ,0,NULL,CREATE_ALWAYS,
        FILE_ATTRIBUTE_NORMAL,NULL);//用这个函数比OpenFile好
    if(pWfile==INVALID_HANDLE_VALUE)
    {
        //MessageBox(NULL,"打开文件失败","Error",MB_OK);
        CloseHandle(pWfile);//一定注意在函数退出之前对句柄进行释放。
        return;
    }

    DWORD writesize = 0;

    //::WriteFile(pWfile,buffer,filesize,&writesize,NULL);
    ::WriteFile(pWfile,target,nSize,&writesize,NULL);

    //善后工作
    delete[]buffer;//注意是delete[]而不是delete
    CloseHandle(pWfile);//关闭句柄
//*/
}