IOS如何调用WCF服务

为某项目做的前期调查。目前可以实现检索，登录等相关机能，部分实现上传文件机能。上传文件仍有大小限制的问题，文件较大时，会出现上传失败的现象（2MB左右的文件会上传失败，），原因暂时不清楚。

项目内调查结果如下：WCF服务端：1.定义WCF协议接口(Interface)

[ServiceContract]
public interface IUpLoadService
{
    [OperationContract]
    [WebInvoke(Method = "POST", UriTemplate = "UploadFile/{fileName}")]
    void UploadFile(string fileName, Stream fileContent);

    [OperationContract]  
    [WebGet(UriTemplate = "GetImageInfo/{name}", ResponseFormat = WebMessageFormat.Json)]  
    ImageInfo GetImageInfo(string name);
}

2.实现协议接口

public class UpLoadService : IUpLoadService
{
    public void UploadFile(string fileName, Stream fileContent)
    {
        FileStream fs = new FileStream("D:\\" + fileName, FileMode.OpenOrCreate);
        try
        {
            BinaryReader reader = new BinaryReader(fileContent);
            byte[] buffer;
            BinaryWriter writer = new BinaryWriter(fs);
            long offset = fs.Length;
            writer.Seek((int)offset, SeekOrigin.Begin);
            do
            {
                buffer = reader.ReadBytes(1024);
                writer.Write(buffer);
            } while (buffer.Length > 0);
        }
        catch (Exception e)
        {
        }
        finally
        {
            fs.Close();
            fileContent.Close();
        }
    }

    public ImageInfo GetImageInfo(string name) {
        return new ImageInfo {imageName=name, imageSize="122KB"};
    }
}

3.Service配置文件：App.config

配置文件中，需要在自己service的endpoint节点中指定绑定方式binding="basicHttpBinding" ，
以及绑定设置bindingConfiguration="MyServiceBinding"，并在bindings节点中定义相应的basicHttpBinding的绑定设置。
这主要是为了设置上传文件的大小限制。
例如：

iOS端程序：

1.上传文件

NSURL *url = [NSURL URLWithString:@"http://172.16.xxx.xxx:82/Service.svc/UploadFile/myphoto.png"];
request_ = [ASIFormDataRequest requestWithURL:url];
[request_ setPostValue:@"myphoto1.png" forKey:@"fileName"];
UIImage *image = [UIImage imageNamed:@"myphoto1.png"];
NSData* imageData = [[NSData alloc] initWithData:UIImagePNGRepresentation(image)];
[request_ appendPostData:imageData];
[request_ setRequestMethod:@"POST"];
[request_ setDidFinishSelector:@selector(requestFinished:)];
[request_ setDidFailSelector:@selector(requestFailed:)];
[request_ setDelegate:self];
[request_ startAsynchronous];

2.调用方法取得返回值

NSURL *url = [NSURL URLWithString:@"http://172.16.xxx.xxx:82/Service.svc/GetImageInfo/1.jpg"];  
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];  
[request startSynchronous];  
NSError *error = [request error];  
if (!error) {  
    NSString *response = [request responseString]; 
    NSLog(response); 
}