char* ConvertToQueryString(struct listKeyValuePair* node)
{
         static bool isStrQueryStringLocaled = false;
         if(isStrQueryStringLocaled)
         {
		free(strQueryString);
                  isStrQueryStringLocaled = false;
         }
	puts("into ConvertToQueryString()");
	static char* strQueryString = (char*)calloc(sizeof(char), 1);
         puts("debug mark");
	if(NULL == strQueryString)
	{
		puts("calloc failed!");
		fflush(stdout);
	}
         else
         {
                 isStrQueryStringLocaled = true;
         }

	while(NULL != node)
	{//一個接一個按照QueryString格式串上去
		size_t newLength =  strlen(strQueryString)+strlen(node->strKey)+strlen(node->strValue)+3; 	puts("while line 1");fflush(stdout);
		strQueryString = (char*)realloc(strQueryString, newLength); 								puts("while line 2");fflush(stdout); //有時會出錯

		if(NULL == node->perv)
		{//如果這是第一個node
			//snprintf(strQueryString, newLength, "%s=%s",node->strKey, node->strValue);
			//sprintf會發生記憶體錯誤
			//snprintf無法把dest變數當作src變數，會把舊內容洗掉
			strncpy(strQueryString, node->strKey, strlen(node->strKey));
			strncat(strQueryString, "=", strlen("="));
			strncat(strQueryString, node->strValue, strlen(node->strValue));
		}
		else
		{//如果這是第二個以後node
			//snprintf(strQueryString, newLength, "%s&%s=%s", strQueryString, node->strKey, node->strValue);
			//sprintf會發生記憶體錯誤
			//snprintf無法把dest變數當作src變數，會把舊內容洗掉
			strncat(strQueryString, "&", strlen("&"));
			strncat(strQueryString, node->strKey, strlen(node->strKey));
			strncat(strQueryString, "=", strlen("="));
			strncat(strQueryString, node->strValue, strlen(node->strValue));
		}
		printf("strQueryString=%s\n",strQueryString);
		node = node->next;
	}
	//puts(strQueryString);

	puts("out ConvertToQueryString()");
	return strQueryString;
}