【转】C++ ZLib压缩与解压缩

原文：http://www.cnblogs.com/chuncn/archive/2011/03/23/1992481.html

 

1. #include "stdafx.h"
   
2. #include "zlib.h"
   
3. #include <iostream>
   
4. using namespace std;
   
5. #pragma comment(lib,"zlib.lib")
   
6. 
   
7. int _tmain(int argc, _TCHAR* argv[])
   
8. {
   
9.     int err;
   
10.     Byte compr[200], uncompr[200]; //足够大
    
11.     uLong comprLen, uncomprLen;
    
12.     const char* hello = "1234567890"; //原文
    
13. 
    
14.     uLong len = strlen(hello);// + 1;
    
15.     comprLen = sizeof(compr) / sizeof(compr[0]);
    
16. 
    
17.     err = compress(compr, &comprLen, (const Bytef*)hello, len);
    
18. 
    
19.     if (err != Z_OK)
    
20.     {
    
21.         cerr << "压缩错误: " << err << '\n ';
    
22.     }
    
23. 
    
24.     cout << "原文长度: " << len << "\n压缩后长度:" << comprLen << '\n ';
    
25.     strcpy((char*)uncompr, "garbage ");
    
26. 
    
27.     err = uncompress(uncompr, &uncomprLen, compr, comprLen);
    
28. 
    
29.     if (err != Z_OK)
    
30.     {
    
31.         cerr << "解压错误: " << err << '\n ';
    
32.     }
    
33. 
    
34.     cout << "\n原文长度:" << len << "\n解压后长度:" << uncomprLen << '\n ';
    
35. 
    
36.     if (strcmp((char*)uncompr, hello))
    
37.     {
    
38.         cerr << "\n解压失败!!!\n ";
    
39.     }
    
40.     else
    
41.     {
    
42.         cout << "\n解压成功:" << (char*)uncompr;
    
43.     }
    
44. 
    
45.     FILE *f= fopen("d:\\b1.bin","wb");
    
46.     fwrite(compr,comprLen,1,f);
    
47.     fclose(f);
    
48. 
    
49.     getchar();
    
50.     return 0;
    
51. }