How to Directly Embed Images into a RichTextBox without Using the Clipboard?

How to Embed Images into a RichTextBox without Clipboard Interference

Most proposed solutions for inserting images into a RichTextBox involve copying the image to the clipboard and then pasting it into the control. However, this method is problematic as it overwrites the current clipboard contents.

A Direct Approach

A more straightforward approach is to directly modify the RichTextBox's RTF code to include the image data. The RTF syntax for an image is as follows:

{' \pict (brdr? & shading? & picttype & pictsize & metafileinfo?) data '}'

Where:

• data is the image data in hexadecimal format (or binary if using the bin control word)
• pict starts the picture group
• Control words within parentheses are optional
• picwX and pichX specify the image's width and height in pixels
• picwgoalX and pichgoalX specify the desired width and height in twips (1 twip = 20 pixels)

Steps for Embedding an Image

1. Open the image and convert it to hexadecimal (or binary) format.
2. Load the data into a string.
3. Construct the RTF code using the appropriate control words and image data.
4. Retrieve the current RTF code from the RichTextBox (e.g., rtbBox.Rtf).
5. Insert the image data at the desired location in the RTF code.
6. Set the updated RTF code back to the RichTextBox (e.g., rtbBox.Rtf = newRtfCode).

Limitations

The .NET RichTextBox has limited support for RTF syntax. To test how it handles specific commands, consider using the provided "RTB Tester" application: http://your-translations.com/toys.

Note: This method assumes the use of hexadecimal image data. There are alternative approaches that use other image formats (e.g., PNG, JPG) or dynamic link libraries (DLLs).

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