我尝试使用PhotoChooserTask选择上传到我的php服务器并在服务器中写入文件时上传图像。我使用UTF8进行编码。但是在服务器中，我得到一个只有1千字节的文件，无论原始图像的大小是多少然后我将它编码为base64string并在服务器中解码。现在我得到的文件大小为4/3 * imagesize（没有解码），但在解码后我无法获得任何图像（文件大小等于原始文件大小）。我尝试过多种方式（用于阅读图像）但未能解决这个问题。可能是什么问题？或者我可以提出其他方法吗？
客户代码：
PhotoChooserTask selectphoto = new PhotoChooserTask();
selectphoto.Completed += new EventHandler<PhotoResult>(photoChooserTask_Completed);
selectphoto.Show();
void photoChooserTask_Completed(object sender, PhotoResult e)
{
if (e.TaskResult == TaskResult.OK)
{
System.Windows.Media.Imaging.BitmapImage bmp = new System.Windows.Media.Imaging.BitmapImage();
bmp.SetSource(e.ChosenPhoto);
byte[] data = null;
using (MemoryStream stream = new MemoryStream())
{
WriteableBitmap wBitmap = new WriteableBitmap(bmp);
wBitmap.SaveJpeg(stream, wBitmap.PixelWidth, wBitmap.PixelHeight, 0, 100);
stream.Seek(0, SeekOrigin.Begin);
data = stream.GetBuffer();
}
string utfData = System.Text.Encoding.UTF8.GetString(data, 0, data.Length);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://192.168.1.49/xampp/imageserver.php");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
postData = String.Format("image={0}", utfData);
// 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();
System.Diagnostics.Debug.WriteLine("sssssrreeeeeessssulllltttttt========="+srresult);
}
}
}, null);
}, null);
}
在服务器中：
<?php
if (isset($_POST['image'])) {
$ifp = fopen( "withoutdecode.txt", "wb" );
fwrite( $ifp, (($_POST['image'])) );
fclose( $ifp );
$ifp2 = fopen( "theImage.png", "wb" );
fwrite( $ifp2, utf8_decode(($_POST['image'])) );
fclose( $ifp2 );
}
else
{
die("no image data found");
echo "fail";
}
?>
答案 0 :(得分：1)
试试这个：
WP侧的（使用图像重新算法）
//将图片转换为字符串
public string ImageToByte（BitmapImage imageSource） { MemoryStream ms = new MemoryStream（）; WriteableBitmap wb = new WriteableBitmap（imageSource）; wb.SaveJpeg（ms，imageSource.PixelWidth，imageSource.PixelHeight，0,100）; byte [] imageBytes = ms.ToArray（）;
string result = Convert.ToBase64String(imageBytes);
return result;
}
//照片选择器任务已完成
BitmapImage image = new BitmapImage（）; image.SetSource（e.ChosenPhoto）;
string fileName = DateTime.Now.Ticks.ToString() + ".jpg";
State["filename"] = fileName;
// Load the picture back into our image
BitmapImage b = new BitmapImage();
b.CreateOptions = BitmapCreateOptions.None;
b.SetSource(e.ChosenPhoto);
double actualHeight = b.PixelHeight;
double actualWidth = b.PixelWidth;
double maxHeight = 600;
double maxWidth = 800;
double imgRatio = actualWidth / actualHeight;
double maxRatio = maxWidth / maxHeight;
double compressionQuality = 0.5;
if (actualHeight > maxHeight || actualWidth > maxWidth)
{
if (imgRatio < maxRatio)
{
//adjust width according to maxHeight
imgRatio = maxHeight / actualHeight;
actualWidth = imgRatio * actualWidth;
actualHeight = maxHeight;
}
else if (imgRatio > maxRatio)
{
//adjust height according to maxWidth
imgRatio = maxWidth / actualWidth;
actualHeight = imgRatio * actualHeight;
actualWidth = maxWidth;
}
else
{
actualHeight = maxHeight;
actualWidth = maxWidth;
}
}
int newh = Convert.ToInt32(ActualHeight);
int neww = Convert.ToInt32(actualWidth);
WriteableBitmap wb = new WriteableBitmap(b);
WriteableBitmap wb1 = wb.Resize(neww, newh, WriteableBitmapExtensions.Interpolation.Bilinear);
// Save the image into isolated storage
using (IsolatedStorageFile isStore = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream targetStream = isStore.OpenFile(fileName, FileMode.Create, FileAccess.Write))
{
WriteableBitmap bitmap = new WriteableBitmap(wb1);
bitmap.SaveJpeg(targetStream, bitmap.PixelWidth, bitmap.PixelHeight, 0, 70);
byte[] content = new byte[e.ChosenPhoto.Length];
e.ChosenPhoto.Read(content, 0, content.Length);
targetStream.Write(content, 0, content.Length);
targetStream.Flush();
}
}
BitmapImage fbmp = new BitmapImage();
using (MemoryStream ms = new MemoryStream())
{
wb1.SaveJpeg(ms, neww, newh, 0, 100);
fbmp.SetSource(ms);
}
string img64 = ImageToByte(fbmp);
将img64发送到服务器，就像在做什么一样！它应该工作
答案 1 :(得分：0)
我终于得到了解决方案。
问题是 - 当我使用Base64进行编码和解码时，网络上的一些不安全字符也被编码。它们是'+'，'/'和'='。在服务器中找不到这些字符。所以，我将'+'，'/'替换为' - '，'_'并删除了'='。在服务器中，完成了相反的工作（对已编辑的base64进行了解析）字符串回到原始base64字符串）。现在我在解码后得到了服务器中的图像。