发送来自Android的图像以ASP.NET Web服务 [英] Send an image from Android to an ASP.NET Web Service

问题描述

我开发一个Android应用程序，应该发送图像到我的ASP.NET Web服务在影像将被保存为一个文件。我见过一对夫妇的方法可以做到这一点，我就为这一个：将图像转换为字节数组 - >字节数组转换为字符串 - >使用KSOAP2发送字符串到Web服务 - >收到字符串在Web服务 - >将其转换为字节数组 - >将其保存为图像：

I'm developing an Android App that should send an image to my ASP.NET Web Service where the image will be saved as a file. I've seen a couple of ways to do this and I went for this one: convert the image to a byte array -> convert the byte array to a string -> send the string to the web service using KSOAP2 -> receive the String at the Web Service -> convert it to a byte array -> Save it as an image:

IVtest = (ImageView)findViewById(R.id.carticon);
BitmapDrawable drawable = (BitmapDrawable) IVtest.getDrawable();
    Bitmap bitmap = drawable.getBitmap();

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
    byte[] data = baos.toByteArray();
    ImageView image=new ImageView(this);
    image.setImageBitmap(bmp);
    String strBase64 = Base64.encode(data);

然后我送strBase64到Web服务。 在Web Service我有这样的：

Then I send strBase64 to the web service. In the Web Service I have this:

public Image ConvertToImage(byte[] image)
{
    MemoryStream ms = new MemoryStream(image);
    Image returnImage = Image.FromStream(ms);
    return returnImage;
}

[WebMethod]
public String UploadImage(String image, String name)
{
    byte[] image_byte = Encoding.Unicode.GetBytes(image);
    Image convertedImage = ConvertToImage(image_byte);
    try {
        convertedImage.Save(Server.MapPath("generated_image.jpg"),     System.Drawing.Imaging.ImageFormat.Jpeg);
    } catch (Exception e) {
        return e.Message;
    }
    return "Success";
}

我得到一个错误，在这条线：图像returnImage = Image.FromStream（MS）;

I get an error at this line: Image returnImage = Image.FromStream(ms);

这是我的错误：

的SOAPFault - 故障code：香皂：服务器在faultstring：System.Web.Services.Protocols.SoapException：服务器无法处理请求。 ---> System.ArgumentException：参数无效。    在System.Drawing.Image.FromStream（流流，布尔useEmbeddedColorManagement，布尔validateImageData）    在System.Drawing.Image.FromStream（流流）    在Service.ConvertToImage（字节[]图像）在E：\ FTP \ NVM \ Service.asmx：行1366    在Service.UploadImage（字符串形象，字符串名称）在E：\ FTP \ NVM \ Service.asmx：行1374    ---内部异常堆栈跟踪的结尾---faultactor：'空'的细节：org.kxml2.kdom.Node@437bf7b0

SoapFault - faultcode: 'soap:Server' faultstring: 'System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.ArgumentException: Parameter is not valid. at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement, Boolean validateImageData) at System.Drawing.Image.FromStream(Stream stream) at Service.ConvertToImage(Byte[] image) in e:\FTP\nvm\Service.asmx:line 1366 at Service.UploadImage(String image, String name) in e:\FTP\nvm\Service.asmx:line 1374 --- End of inner exception stack trace ---' faultactor: 'null' detail: org.kxml2.kdom.Node@437bf7b0

感谢

推荐答案

好像有什么前途未卜从字符串的转换为图像。你也不能处理你的数据流，这将导致内存泄漏。

Seems like there is something iffy with your conversion from string to image. Also you are not disposing your stream which will leak memory.

试试这个来代替：

private Image Base64ToImage(string base64String)
    {
        // Convert Base64 String to byte[]
        byte[] imageBytes = Convert.FromBase64String(base64String);
        using (var ms = new MemoryStream(imageBytes, 0,
                                         imageBytes.Length))
        {
            // Convert byte[] to Image
            ms.Write(imageBytes, 0, imageBytes.Length);
            Image image = Image.FromStream(ms, true);
            return image;
        }
    }

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