"Failed writing body" CURLOPT_WRITEDATA

下面的代码是使用wsdl从服务器获得响应，这里的问题是curl返回响应，但我无法打印它。

写主体失败写数据失败

#include<stdio.h>
#include<string.h>
#include"../include/curl.h"
size_t write_data(void *ptr, size_t size, size_t count, void *stream)
{
      /* ptr - your string variable.
      stream - data chuck you received */
     printf("%.*s", size, (char*)stream);
}

int main()
{
    int res=0,i=0;
    char buffer[4098]="",buff[128]="",buf[256]="",buf7[30]="",buf6[30]="",buf5[30]="";
    char machineid[]="SUBANI";
    char filename1[50]="";
    int refno=0,paymode=0,taxtype=0;
    FILE *fbc;
    memset(filename1,0,sizeof(filename1));
    sprintf(filename1,"/mnt/jffs2/Response_Details1.xml");
    lk_dispclr();
    lk_disptext(1,0,(unsigned char *)"Sending Request",0);
    lk_disptext(2,0,(unsigned char *)"Please Wait",0);
    memset(buffer,0,sizeof(buffer));
    sprintf(buffer,"<?xml version="1.0" encoding="utf-8"?>
                        <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:log="http://wsdlclassess.application.sims.test.com">
                        <soap:Header>
                        </soap:Header>
                        <soap:Body>
                        <log:loginMethod>
                        <log:loginid>%s</log:loginid>
                        <log:password>%s</log:password>
                        </log:loginMethod>
                        </soap:Body>
                        </soap:Envelope>","raja","test");

    res=GET_FILE1(buffer,filename1);

    return 0;
}

int GET_FILE1(char *buffer,char *filename)
{
    CURL *curl;
    CURLcode res;
    struct curl_slist *headers = NULL;
    FILE *out_fd = (FILE *) 0;
    char errorbuf[300] = "",tmpbuff[128]="";
    char errmsg[256];
    int Timeout=120;   //Default timeout is = 2 mins
    int buffer_size = 0;
    char urlbuff[256]="";
    char mstr[10240];
    memset(urlbuff,0,sizeof(urlbuff));
        memset(tmpbuff,0,sizeof(tmpbuff));
    buffer_size = strlen(buffer);
         strcpy(tmpbuff,"http://10.10.1.111:8081/test_server/services/application?wsdl");
             tmpbuff[strlen(tmpbuff)]='';
    curl = curl_easy_init();
    if(curl)
    {
        out_fd = fopen (filename, "w");
        curl_easy_setopt(curl, CURLOPT_FILE, out_fd);
        printf("%s:Sign-In Requestn", __func__);
        headers = curl_slist_append(headers, "Content-type:application/soap+xml; charset=utf-8; action="http://wsdlclassess.application.sims.test.com/loginMethod"");
        curl_easy_setopt(curl, CURLOPT_URL, tmpbuff);
        curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0);
        curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, mstr);

        curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, buffer_size);
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, buffer);
        curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
        curl_easy_setopt(curl, CURLOPT_TIMEOUT, Timeout);
        curl_easy_setopt(curl, CURLOPT_ERRORBUFFER,errmsg);
        printf("The Server%s:Performing Transaction.....n",__func__);
        res = curl_easy_perform(curl);
        printf("res=after culreasey perform%dn",res);
        curl_slist_free_all(headers);
        curl_easy_cleanup(curl);
        printf("nerrorbuf:%sn",errmsg);
        fclose(out_fd);
        if(CURLE_OK != res)
        {
            puts("error occured isn" );
            //ppp_close();
            return -1;
        }
    }
    return 0;
}