C++ curl wrapper

I am spending some time writing a little app to index all of my books. As I am getting the data from amazon I needed a little curl wrapper for C++. As the libcurl or curl man page and the online resources take some time to look through here it is.
You just give it a URL and the class will return a string with the content of the URL or NULL if a error accrued. This can be saved into a file. For example to download a image.

Don't forget to add LDFLAGS=`curl-config --libs` in your Makefile

The .h file

 1: /*
 2:  * DBook : Didi's book system
 3:  *
 4:  * $Id: GetDataCurl.h,v 1.1 2007/04/22 23:57:17 didi Exp $
 5:  *
 6:  * This class is used to download a webpage with curl
 7:  *
 8:  */
 9: 
10: #include <string>
11: #include <iostream>
12: #include "curl/curl.h"
13: 
14: namespace dbook{
15: 
16:   class GetDataCurl{
17: 
18:   public:
19:     std::string getDataFromWeb(std::string theUrl);
20: 
21:   private:
22:     char bufferError[CURL_ERROR_SIZE];
23:     std::string outputBuffer;
24: 
25:     /* The curl thing */
26:     /* Has to be static because c doesn't understand C++ */
27:     static int curlWriter
( char *data, size_t size, size_t nmemb, std::string *outputBuffer);
28:   };
29: }
 

And the .cpp File

 1: /*
 2:  * DBook : Didi's book system
 3:  *
 4:  * $Id: GetDataCurl.cpp,v 1.1 2007/04/22 23:57:17 didi Exp $
 5:  *
 6:  * This is the main class for getting data from a http server
 7:  *
 8:  */
 9: 
10: 
11: #include <string>
12: #include <iostream>
13: #include "curl/curl.h"
14: 
15: #include "GetDataCurl.h"
16: #include <errno.h>
17: 
18: namespace dbook{
19: 
20:   std::string GetDataCurl::getDataFromWeb(std::string theUrl){
21: 
22:     CURL *curl;
23:     CURLcode result;
24: 
25:     /* Init */
26:     curl = curl_easy_init();
27: 
28:     if (curl){
29:       /* set up some stuff */
30:       curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, bufferError);
31:       curl_easy_setopt(curl, CURLOPT_URL, theUrl.c_str() );
32:       curl_easy_setopt(curl, CURLOPT_HEADER, 0);
33:       curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
34:       curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curlWriter);
35:       curl_easy_setopt(curl, CURLOPT_WRITEDATA, &outputBuffer);
36: 
37:       result = curl_easy_perform(curl);
38: 
39:       /* Clean*/
40:       curl_easy_cleanup(curl);
41: 
42: 
43:       if (result == CURLE_OK){
44:         return outputBuffer;
45:       }else{
46:         /* Something whent wront trying to download the page */
47:         std::cerr << "Error: " << bufferError << std::endl;
48:         return NULL;
49:       }
50:     }else{
51:       /* Something whent wrong while trying to init curl */
52:       perror("curl_easy_init failed");
53:       return NULL;
54:     }
55: 
56:   }
57: 
58: 
59:   /* The curl thing */
60:   int GetDataCurl::curlWriter
(char *data, size_t size, size_t nmemb, std::string *outputBuffer){
61:     /* Check for errors */
62:     if (outputBuffer != NULL){
63:       outputBuffer->append(data, size * nmemb);
64:     }
65:     return (size * nmemb);
66: 
67:   }
68: 
69: }