解决webserver在IE下载文件，文件名为乱码有关问题

解决webserver在IE下载文件，文件名为乱码问题
通常使用以下代码就能导出为流的文件，而不是打开文件

websWrite(wp, T("HTTP/1.1 200 OK\n"));websWrite(wp, T("Pragma: no-cache\n"));websWrite(wp, T("Cache-control: no-cache\n"));websWrite(wp, T("Content-Length: %ld\n"),sbufs.st_size);websWrite(wp, T("Content-Type: application/force-download\n"));websWrite(wp, T("Content-Type: application/vnd.ms-excel; charset=utf-8\n"));//websWrite(wp, T("Content-type: application/octet-stream\n"));websWrite(wp, T("Content-Transfer-Encoding: binary\r\n"));websWrite(wp, T("Content-Disposition: attachment; filename="%s"\n\n"),pname);

webserver支持下载的函数：

/** * @brief URLEncode 对字符串URL编码 * * @param str 原字符串 * @param strSize 原字符串长度(不包括最后的\0) * @param result 结果缓冲区的地址 * @param resultSize 结果缓冲区的大小(包括最后的\0) * * @return: >0:resultstring 里实际有效的长度 *            0: 解码失败. */  int URLEncode(const char* str, const int strSize, char* result, const int resultSize)  {      int i;      int j = 0;//for result index      char ch;        if ((str==NULL) || (result==NULL) || (strSize<=0) || (resultSize<=0)) {          return 0;      }        for ( i=0; (i<strSize)&&(j<resultSize); ++i) {          ch = str[i];          if (((ch>='A') && (ch<'Z')) ||              ((ch>='a') && (ch<'z')) ||              ((ch>='0') && (ch<'9'))) {              result[j++] = ch;          } else if (ch == ' ') {              result[j++] = '+';          } else if (ch == '.' || ch == '-' || ch == '_' || ch == '*') {              result[j++] = ch;          } else {              if (j+3 < resultSize) {                  sprintf(result+j, "%%%02X", (unsigned char)ch);                  j += 3;              } else {                  return 0;              }          }      }        result[j] = '\0';      return j;  }  #define BUFFER_SIZE 2048static void downloadFiles(webs_t wp, char_t *path, char_t *query) {char _filePath[1024]={0},encodFilename[1024]={0};char *fileName,*file_path,*browser,*pname;unsigned char data[BUFFER_SIZE]={0};char err_msg[256];long  count;struct stat sbufs;FILE  *src;fileName = websGetVar(wp, T("downFileName"), T(""));file_path = websGetVar(wp, T("download_path"), T(""));browser = websGetVar(wp, T("browserType"), T("")); //浏览器类型sprintf(_filePath,"/media%s",file_path);memset(&sbufs,0,sizeof(sbufs));src = fopen(_filePath, "r");if (!src) {websWrite(wp, T("HTTP/1.1 200 OK\nContent-type: text/plain\nPragma: no-cache\nCache-Control: no-cache\n\n"));sprintf (err_msg, "Can't fopen %s: %s\n", _filePath, strerror(errno));websWrite(wp,T("%s"),err_msg); websDone(wp, 200);goto error;}if(!strcmp(browser,"IE")){URLEncode(fileName, strlen(fileName), encodFilename, sizeof(encodFilename));pname=encodFilename;}else{pname=fileName;}stat(_filePath, &sbufs);websWrite(wp, T("HTTP/1.1 200 OK\n"));websWrite(wp, T("Pragma: no-cache\n"));websWrite(wp, T("Cache-control: no-cache\n"));websWrite(wp, T("Content-Length: %ld\n"),sbufs.st_size);websWrite(wp, T("Content-Type: application/force-download\n"));websWrite(wp, T("Content-Type: application/vnd.ms-excel; charset=utf-8\n"));//websWrite(wp, T("Content-type: application/octet-stream\n"));websWrite(wp, T("Content-Transfer-Encoding: binary\r\n"));websWrite(wp, T("Content-Disposition: attachment; filename="%s"\n\n"),pname);while ((count = fread(data, 1, BUFFER_SIZE, src)) > 0) {websWriteBlock(wp, data, count);}fclose(src);error:return;//websDone(wp, 200);}

但是，如果fileName是UTF-8编码的，比如文件名为测试.html;
ie这时就搞些小情绪，文件名变成了乱码了

在RFC2231的定义里面， 多语言编码的Content-Disposition应该这么定义：
Content-Disposition: attachment; filename*="utf8''%E6%B5%8B%E8%AF%95.html"
即：
filename后面的等号之前要加 *
filename的值用单引号分成三段，分别是字符集(utf8)、语言(空)和urlencode过的文件名。
所以这时应该对文件名进行url编码转换 ，使用urlencode很轻松就搞定了

因此，以上代码应该加上url编码转换

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