Question

我尝试从网址下载图片并将其设置为剪贴板（WPF）。我可以将图像粘贴到Paint但不粘贴到本地目录。

以下是我的代码下载和设置到剪贴板：

var request = WebRequest.Create(urlImg); // urlImg  - url of image
var response = request.GetResponse();
var responseStream = response.GetResponseStream();
var bitmap2 = new Bitmap(responseStream);

var orgimg = LoadBitmap2(bitmap2); // converting to BitmapSource
Clipboard.SetImage(orgimg);

Answer 1

当您将图像剪切/复制并粘贴到文件系统时，只有剪贴板数据中的路径。

如果您想将下载的图像“粘贴”到目录中，则需要模拟该行为：

将下载的图像写入临时目录
使用相应的粘贴数据设置剪贴板（请参阅DataFormats.FileDrop）
确保将模式设置为“剪切”，以使图像不会留在临时位置

实施例

string url = "http://example.com/images/someimage.jpeg";
var img = GetImageFromUrl(url);

//write the image to a temporary location (todo: purge it later)
var tmpFilePath = Path.Combine(Path.GetTempPath(), Path.GetFileName(url));
img.Save(tmpFilePath);

//group image(s)
var imgCollection = new System.Collections.Specialized.StringCollection();
imgCollection.Add(tmpFilePath);

//changing the drop affect to 'move' from the temp location
byte[] moveEffect = new byte[] { 2, 0, 0, 0 };
MemoryStream dropEffect = new MemoryStream();
dropEffect.Write(moveEffect, 0, moveEffect.Length);

//set up our clipboard data
DataObject data = new DataObject();
data.SetFileDropList(imgCollection);
data.SetData("Preferred DropEffect", dropEffect);

//push it all to the clipboard
Clipboard.Clear();
Clipboard.SetDataObject(data, true);

GetImageFromUrl()的位置：

private System.Drawing.Image GetImageFromUrl(string url)
{
    HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);

    using (HttpWebResponse httpWebReponse = (HttpWebResponse)httpWebRequest.GetResponse())
    {
        using (Stream stream = httpWebReponse.GetResponseStream())
        {
            return System.Drawing.Image.FromStream(stream);
        }
    }
}

注意：您需要为System.Drawing课程添加Image的引用。我确信在WPF空间中有另一种选择。

进一步阅读

Clipboard.SetImage不起作用

1 个答案: