棘手的问题！急！急！急！急！急！急！各位帮忙看看，up 有分

Question

http://www.codeproject.com/csharp/dotnet_convertimage.aspImage Format Conversion in .NET

Answer 1

<%@ WebService language="C#" class="WSC_ConvertImage" %>
using System;
using System.Web.Services;
using System.Xml.Serialization;
using System.Drawing; // for Image class
using System.Drawing.Imaging; // for ImageFormat class
using System.IO; // for FileStream class
public class WSC_ConvertImage : WebService {
    [WebMethod]
    public bool ConvertImage(byte[] bytInFile, int intToFormat, 
         out byte[] bytOutFile)
    {
        // has something been sent or not...
        bytOutFile=null;
        if (bytInFile.Length==0)
        {
            // nope.. indicate failure
            return false;
        }        // Since webservices are stateless, and each webmethod call is
        // indepedent of another, we must have a unique file name for
        // processing each request.
        string strFileName=Server.MapPath(".")+"\\"+
           Guid.NewGuid().ToString();        // write the byte array sent to us as a file..
        FileStream fsFile=null;
        try
        {
            fsFile=File.Create(strFileName);
        }
        catch
        {
            // unable to create input file..
            return false;
        }        // write the byte array to it..
        try
        {
            fsFile.Write(bytInFile,0,bytInFile.Length);
        }
        catch
        {
            // unable to write to the file..
            fsFile.Close();
            return false;
        }        // close the file..
        fsFile.Close();        // load the image from the file..
        Image imgInFile=Image.FromFile(strFileName);        // save to the format specified..
        string strOutFileName=strFileName;        switch(intToFormat)
        {
        case 1: // BMP
            strOutFileName=strOutFileName+".BMP";
            imgInFile.Save(strOutFileName,ImageFormat.Bmp); 
            break;
        case 2: // EXIF
            strOutFileName=strOutFileName+".EXIF";
            imgInFile.Save(strOutFileName,ImageFormat.Exif); 
            break;
        case 3: // EMF
            strOutFileName=strOutFileName+".EMF";
            imgInFile.Save(strOutFileName,ImageFormat.Emf); 
            break;
        case 4: // GIF
            strOutFileName=strOutFileName+".GIF";
            imgInFile.Save(strOutFileName,ImageFormat.Gif); 
            break;
        case 5: // ICO
            strOutFileName=strOutFileName+".ICO";
            imgInFile.Save(strOutFileName,ImageFormat.Icon); 
            break;
        case 6: // JPEG
            strOutFileName=strOutFileName+".JPG";
            imgInFile.Save(strOutFileName,ImageFormat.Jpeg); 
            break;
        case 7: // PNG
            strOutFileName=strOutFileName+".PNG";
            imgInFile.Save(strOutFileName,ImageFormat.Png); 
            break;
        case 8: // TIFF
            strOutFileName=strOutFileName+".TIFF";
            imgInFile.Save(strOutFileName,ImageFormat.Tiff); 
            break;
        case 9: // WMF
            strOutFileName=strOutFileName+".WMF";
            imgInFile.Save(strOutFileName,ImageFormat.Wmf); 
            break;
        default:
            strOutFileName=strOutFileName+".BMP";
            imgInFile.Save(strOutFileName,ImageFormat.Bmp); 
            break;
        }        // read the output file..
        try
        {
            fsFile=File.Open(strOutFileName,FileMode.Open,FileAccess.Read);
        }
        catch
        {
            // unable to read output file..
            return false;
        }        // write to the output byte array..
        try
        {
            // create array to read in image file..
            int iSize=Convert.ToInt32(fsFile.Length);
            bytOutFile = new byte[iSize];            // read the converted image...
            fsFile.Read(bytOutFile,0,iSize);
        }
        catch
        {
            // unable to write to the array..
            fsFile.Close();
            return false;
        }        // close the file..
        fsFile.Close();        // delete the created files..
        try
        {
            File.Delete(strFileName);
            File.Delete(strOutFileName);
        }
        catch
        {
            // do nothing..
        }        return true;
    }
}

Answer 2

从net_lover(孟子E章)帖子那里抄的