C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
11,339 questions
How to set clipboard data with the image that is not local when setting?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(25.6, 94%, 12%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EKX%3C/text%3E%3C/svg%3E)
kai xiong
21
Reputation points
Hi, I'm trying to implement a feature, "copy" operation in my web APP will call C# dll API to set the image files data into clipboard, the image files don't exist locally, when user do "paste" operation, the app downloads the image files into local storage and paste to the target application. Now, I can paste Windows File Explorer by using System.Runtime.InteropServices.ComTypes.IDataObject "FileGroupDescriptorW"
"FileContents", but can't paste the bitmap to 3rd APP when the image file is not stored. Anyone can help? Sample code of setting bitmap with DataObject Will be good. Thanks a lot!
C#
{count} votes
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(64, 85%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJX%3C/text%3E%3C/svg%3E)
Jiale Xue - MSFT 49,126 Reputation points Microsoft External Staff2025-03-11T02:12:49.8466667+00:00 Hi @kai xiong , Welcome to Microsoft Q&A,
DataObject.SetData(DataFormats.Bitmap, true, bitmap)puts the Bitmap into aDataObjectand copies it to the clipboard.GetImageFromApi is only used to simulate acquisition.
using System; using System.Drawing; using System.Windows.Forms; namespace xxx { class Program { [STAThread] // Important: Clipboard API requires STA thread static void Main() { // Simulate getting image data from API Bitmap bitmap = GetImageFromApi(); if (bitmap != null) { // Create DataObject and set Bitmap data DataObject dataObject = new DataObject(); dataObject.SetData(DataFormats.Bitmap, true, bitmap); // Copy to clipboard Clipboard.SetDataObject(dataObject, true); Console.WriteLine("Image has been successfully copied to clipboard!"); } else { Console.WriteLine("Image data not obtained"); } } static Bitmap GetImageFromApi() { // Here simulates getting image from API int width = 200, height = 200; Bitmap bmp = new Bitmap(width, height); using (Graphics g = Graphics.FromImage(bmp)) { g.Clear(Color.Blue); g.DrawString("Hello Clipboard!", new Font("Arial", 12), Brushes.White, new PointF(10, 90)); } return bmp; } } } -
Viorel 120.4K Reputation points2025-03-11T05:56:26.21+00:00 Maybe you should consider the Delayed Rendering:
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kai xiong 21 Reputation points
2025-03-12T03:51:15.51+00:00 I tried delayed rendering, but WM_RENDERFORMAT will be sent to the APP as the APP is launched, it seemed delyaed rendering can not work.
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kai xiong 21 Reputation points
2025-03-12T03:54:53.64+00:00 hi,
your sample code will be good when the file is already stored in local, but my target is to download the file only when user does "paste" operation, could you plz check this situation?
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Jiale Xue - MSFT 49,126 Reputation points Microsoft External Staff
2025-03-12T09:46:43.5933333+00:00 We do not recommend modifying the user's clipboard, which is not in line with the writing standards. The method you need can create two shortcut keys to save the download link and download.
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