我正在尝试为 Windows Phone 7 开发一个应用程序,该应用程序使用 PHP 将所选图片(来自图片选择器任务)上传到服务器。
我正在尝试使用 HttpWebRequest 来做到这一点。并且数据也成功发布。我面临的问题是在发布之前需要将图像编码为base64。而且,我无法正确编码。
到目前为止,这是我的 C# 代码:
public partial class SamplePage : PhoneApplicationPage
{
public SamplePage()
{
InitializeComponent();
}
PhotoChooserTask selectphoto = null;
private void SampleBtn_Click(object sender, RoutedEventArgs e)
{
selectphoto = new PhotoChooserTask();
selectphoto.Completed += new EventHandler<PhotoResult>(selectphoto_Completed);
selectphoto.Show();
}
void selectphoto_Completed(object sender, PhotoResult e)
{
if (e.TaskResult == TaskResult.OK)
{
BinaryReader reader = new BinaryReader(e.ChosenPhoto);
image1.Source = new BitmapImage(new Uri(e.OriginalFileName));
txtBX.Text = e.OriginalFileName;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://"+QR_Reader.MainPage.txtBlck+"/beamer/saveimage.php");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
string str = BitmapToByte(image1);
MessageBox.Show(str);
string postData = String.Format("image={0}", str);
// Getting the request stream.
request.BeginGetRequestStream
(result =>
{
// Sending the request.
using (var requestStream = request.EndGetRequestStream(result))
{
using (StreamWriter writer = new StreamWriter(requestStream))
{
writer.Write(postData);
writer.Flush();
}
}
// Getting the response.
request.BeginGetResponse(responseResult =>
{
var webResponse = request.EndGetResponse(responseResult);
using (var responseStream = webResponse.GetResponseStream())
{
using (var streamReader = new StreamReader(responseStream))
{
string srresult = streamReader.ReadToEnd();
}
}
}, null);
}, null);
} // end of taskresult == OK
} // end of select photo completed
private Stream ImageToStream(Image image1)
{
WriteableBitmap wb = new WriteableBitmap(400, 400);
wb.Render(image1, new TranslateTransform { X = 400, Y = 400 });
wb.Invalidate();
Stream myStream = new MemoryStream();
wb.SaveJpeg(myStream, 400, 400, 0, 70);
return myStream;
}
private string BitmapToByte(Image image) //I suspect there is something wrong here
{
Stream photoStream = ImageToStream(image);
BitmapImage bimg = new BitmapImage();
bimg.SetSource(photoStream); //photoStream is a stream containing data for a photo
byte[] bytearray = null;
using (MemoryStream ms = new MemoryStream())
{
WriteableBitmap wbitmp = new WriteableBitmap(bimg);
wbitmp.SaveJpeg(ms, wbitmp.PixelWidth, wbitmp.PixelHeight, 0, 100);
bytearray = ms.ToArray();
}
string str = Convert.ToBase64String(bytearray);
return str;
}
}
BitmapToByte 函数用于将图像转换为 base64 字符串。并且,ImageToStream 函数用于将其转换为流。
现在,我严重怀疑这两个函数有问题。
此外,我为每个图像得到完全相同的 base64 字符串。是的,无论我选择什么图像,我都会得到完全相同的 base64 字符串。这很奇怪。我不知道这有什么问题。
我在这里上传了一个文本文件:http: //textuploader.com/?p=6&id=vWZy 它包含那个 base64 字符串。
在服务器端,PHP 成功地接受了 postdata 并且解码工作也很完美(我手动解码了一些 base64 字符串以确保这一点)。我面临的唯一问题是 base64 编码。
请帮我。
编辑 我在 ImageToStream 和 BitmapToByte 函数中进行了以下更改:
private MemoryStream ImageToStream(Image image1)
{
WriteableBitmap wb = new WriteableBitmap(400, 400);
wb.Render(image1, new TranslateTransform { X = 400, Y = 400 });
wb.Invalidate();
MemoryStream myStream = new MemoryStream();
wb.SaveJpeg(myStream, 400, 400, 0, 70);
return myStream;
}
private string BitmapToByte(Image image)
{
MemoryStream photoStream = ImageToStream(image);
byte[] bytearray = photoStream.ToArray();
string str = Convert.ToBase64String(bytearray);
return str;
}