关于compress 解压之后失败 -3

rjamesz

1. #include <zlib.h>
   
2. #include <iostream>
   
3. #include <stdlib.h>
   
4. #include <stdio.h>
   
5. #include <string>
   
6. #include <string.h>
   
7. using namespace std;
   
8. /*add by reggie */
   
9. int main(){
   
10.         string message,pmessage;
    
11.         message = "absdfafsdsdf";
    
12.         uLong destlen = compressBound((uLong)message.size());
    
13.         const char *tmpbuf = message.c_str();
    
14.         char *compressbuf = new char[destlen];
    
15.         int ret = compress((Byte*)compressbuf, &destlen, (const Byte*)tmpbuf, (uLong)message.size());
    
16.         fprintf(stderr,"before compress  is <%lu>,after compress is <%lu>\n",message.size(),strlen(compressbuf));
    
17.         if(ret == Z_OK)
    
18.         {
    
19.                 fprintf(stderr, "compress success <%lu>\n", destlen);
    
20.                 pmessage = compressbuf;
    
21.         }
    
22.         else
    
23.         {
    
24.                 fprintf(stderr, "compress failed: %d", ret);       
    
25.                 pmessage = message;
    
26.         }
    
27.         delete[] compressbuf;
    
28.         //fprintf(stderr,"after compress ptr is [%s],len is <%lu>\n",pmessage.c_str(),pmessage.size());
    
29.         /*end by reggie*/
    
30.        
    
31.         /*add by reggie */
    
32.         {uLong destlen = pmessage.size() * 30;//30随便写的，一般不超过10怕不够大
    
33.         fprintf(stderr,"message size is <%lu>\n",pmessage.size());
    
34.         char *uncompressbuf = new char[destlen];
    
35.         int ret = uncompress((Byte*)uncompressbuf, &destlen, (const Byte*)pmessage.c_str(), pmessage.size());
    
36.         fprintf(stderr,"uncompress string is [%s]\n",uncompressbuf);
    
37.         if(ret == Z_OK)
    
38.         {
    
39.                 fprintf(stderr,"uncompress success %lu\n", destlen);
    
40.         }
    
41.         else
    
42.         {
    
43.                 fprintf(stderr, "uncompress failed: %d\n", ret);
    
44.         }
    
45.         delete[] uncompressbuf;
    
46.         }
    
47. }
    

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是想要给数据在网络传输中压缩一下，本来一个客户端压缩，服务端解压。上面的代码是我一个测试的代码，压缩完解压显示-3错误，为甚么有一些多余的变量，因为是在源码里面拿出来测试的，稍微改了一下。麻烦大家帮忙看下为甚么一直解压错误。
PS：编译的时候 -lz