接口调用参数只能是字符串格式，返回格式支持3种（字符串，数组，DataSet）
需要引用第三方库，包含（DataSet,PlatServinceDataParser,WebserviceCommon,WebServiceHelper,XMLArrayParser,XMLDataSetParser,XMLResultParser）
程序中引用2个即可
#import "WebServiceCommon.h"
#import"DataSet.h"
- (void)getwebserver
{
WebServiceCommon *webService=[[WebServiceCommonalloc] init];
//方法一，取返回字符串
NSString *result= [webServicegetResultWithURL:@"http://116.6.52.27:91/webservice/caskaforescService.asmx"xmlNS:nilmethod:@"GetCarTypeTree"pars:nil];
NSLog(@"%@",result);
[result release];
//带参数传值调用方法
NSMutableDictionary *dic=[[NSMutableDictionaryalloc]initWithObjectsAndKeys:@"test2",@"username",@"820826",@"passWord",@"1EB2D9848C5545E6BAEAA10B01222800",@"clubUserid",@"西南大区",@"BigArea",@"",@"province",@"",@"city",nil];
NSString *result2= [webServicegetResultWithURL:@"http://116.6.52.27:91/webservice/caskaforescService.asmx"xmlNS:nilmethod:@"GetClub"pars:dic];
NSLog(@"%@",result2);
[dic release];
[result2 release];
//方法二，取返回数据组
NSArray *array=nil;
NSMutableDictionary *dic2=[[NSMutableDictionaryalloc]initWithObjectsAndKeys:@"...",@"VerifyCode", @"",@"objParams",@"20120615170225282486",@"sAccountBookID", @"XYTY124",@"productModel", @"馨原奕绒",@"brandName", nil];
array=[webServicegetArrayWithURL:@"http://resourceservice.41go.cn/systemupdate.asmx"xmlNS:nilmethod:@"GetProductPriceInfoExt"pars:dic2];
NSLog(@"productmodel=%@;name=%@,key=%@",[arrayobjectAtIndex:2],[arrayobjectAtIndex:3],[arrayobjectAtIndex:10]);
//判断数据中的空值（NSArray,NSMutableDictionary等）
if ([array objectAtIndex:10]==[NSNullnull]) {
NSLog(@"空值！");
}
[dic2 release];
//方法三，取返回DataSet
[webServiceinitDataSetWithURL:@"http://resourceservice.41go.cn/systemupdate.asmx"xmlNS:nilmethod:@"GetYarnList"pars:nil];
NSMutableDictionary *wb=[webService.myDataset.TablesobjectForKey:@"YarnList"];//YarnList表名，如果没有命名则为Table
NSInteger count=[[webService.myDataset.TablesobjectForKey:@"YarnList"]count];
for (int ii=0; ii<count; ii++) {
NSMutableDictionary *dictemp=[wb objectForKey:[NSStringstringWithFormat:@"%d",ii]];
NSLog(@"col1=%@;col2=%@;col3=%@",[dictempobjectForKey:@"C_AccountBookID"],[dictempobjectForKey:@"C_Name"],[dictempobjectForKey:@"C_YarnID"]);
}
[webService release];
}