如何WCF异步调用如何返回位图类型的值的问题. [英] How to WCF Asynchronous calls problem with how to return value of Bitmap type.

问题描述

这是我的第一个WCF，

我已经阅读了过去一天的内容，在很大程度上，我对此有很好的理解(我认为)，但似乎我只是缺少了一些东西.请允许我解释.

我目前有一个项目可以绘制分形并且是多线程的&并行化此项目的核心是函数"CalcFractel()"，该项目的当前版本正在运行和调试.现在，对于该项目的下一个版本，我需要将处理部分卸载到WCF所在的Web服务上.通过阅读这两本优秀的教程，我已经了解到以下IServices.cs是您需要的接口在services.svc.cs中实施.因此，这就是我使用VS 2010 Ultimate添加到自动生成的IServices.cs中的内容.而且我已经选中了服务引用"列表下的生成异步操作"复选框.

Hi this is my first WCF,

I have read the past day on how to this, and for the most part I have a good understanding of it ( I think ), but it seems I''m just missing something a little bit. allow me to explain.

I have a project currently that draws fractals and is multi-threaded & parallelized the heart of this project is The function "CalcFractel()" the current version of the project is running and debugged. Now for the next version of this project I need to offload the processing portion to a webservice thats where WCF comes in. From what I have read both here with the great tutorials I have understood the following the IServices.cs is the interface which you need to implement in services.svc.cs. So here is what I have added to the auto generated IServices.cs I''m using VS 2010 Ultimate I don''t if that matters thought I mention it. And I have already checked the "Generate asynchronous operations" check box under the Service references list.

[OperationContract]
       Bitmap CalcFractel(int width, int height, float complexX, float complexY);

在实现方面(即Services.cs)，我执行了以下操作.

on the implementation side (ie Services.cs)I did the following.

public Bitmap CalcFractel(int width, int height, float complexX, float complexY)
        {
            Bitmap bmp = new Bitmap(width, height);
            if ((width != 0) && (height != 0))
            {
                
                Graphics g = Graphics.FromImage(bmp);
                SolidBrush b = new SolidBrush(Color.Aqua);
                Rectangle r = new Rectangle(0, 0, width, height);
                g.FillRectangle(b, r);
                return bmp;
            }
            else            
                return null;
            
        }

在客户端，我添加了以下代码...因此在事件处理程序中
"client_GetDataCompleted(对象发送者，ServiceReference1.GetDataCompletedEventArgs e)"我不知道如何获取位图.细绳.这是我最后需要我自己解决的问题，如果您能提供帮助，将不胜感激.

On the client side I added the following code... so in the Event Handler
"client_GetDataCompleted(object sender, ServiceReference1.GetDataCompletedEventArgs e)" I don''t know how to get at the bitmap.. I thought e.result would have what i was returning in the function on the server side but I just get a type string. This is the the last piece I need I figured the rest out on my own, and if you can help well any help would be greatly appreciated.

<pre lang="msil">private void Test_Click(object sender, EventArgs e)
        {

            ServiceReference1.Service1Client client = new ServiceReference1.Service1Client();
            client.GetDataCompleted += new EventHandler<ServiceReference1.GetDataCompletedEventArgs>(client_GetDataCompleted);
            
        }

和事件处理程序

and the Event handler

oid client_GetDataCompleted(object sender, ServiceReference1.GetDataCompletedEventArgs e)        
        {
            //e.result does not give me the bitmap
            //returned by the CalcFractel function on the server side
            //How do I get to it?
            Bitmap bmp = e.Result.
        }

谢谢，
:-O:confused:

thanks,
:-O :confused:

推荐答案

将签名更改为

Change the signature to

[OperationContract]
 byte[] CalcFractel(int width, int height, float complexX, float complexY);

并使用类似
C#图像到字节数组和字节数组到图像转换器类 [

and use something like
C# Image to Byte Array and Byte Array to Image Converter Class[^]

to convert your image to and from a byte array - WCF handles serialization of byte[] nicely.

Regards
Espen Harlinn

回答以下后续问题之一:

到base64:
http://msdn.microsoft.com/en-us/library/system.convert. tobase64string.aspx [ ^ ]，请参见每种重载方法下的示例.

来自base64:
http://msdn.microsoft.com/en-us/library/system.convert. frombase64string.aspx [ ^ ].

这应该足够清楚.

—SA

To answer one of the follow-up questions:

To base64:
http://msdn.microsoft.com/en-us/library/system.convert.tobase64string.aspx[^], see samples under each overloaded method.

From base64:
http://msdn.microsoft.com/en-us/library/system.convert.frombase64string.aspx[^].

This should be clear enough.

—SA

我的评论有误.位图不是抽象的，因此不会出现序列化问题.当我从内存中消失时，我对Image类感到困惑，

您需要在事件处理程序中做的是

Hi,

I made a mistake in my comment. Bitmap isn''t abstract so you don''t get serializtion Issues. I got confused with Image class as I was going from memory,

What you need to do in the event handler is

private void getBitmap_Click(object sender, RoutedEventArgs e)
        {
            ServiceReference1.IService1 client = new ServiceReference1.Service1Client();
            Bitmap bm = client.GetBitmap();

            MemoryStream ms = new MemoryStream();
            bm.Save(ms, ImageFormat.Png);
            ms.Position = 0;
            BitmapImage bi = new BitmapImage();
            bi.BeginInit();
            bi.StreamSource = ms;
            bi.EndInit();
            
            DisplayImage.Source = bi; 
            
        }

这将获取图像，然后将其放入WPF中的图像

This gets the image and then puts it into an Image in WPF

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