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Synthesized Clipboard Formats

The system implicitly converts data between certain clipboard formats: if a window requests data in a format that is not on the clipboard, the system converts an available format to the requested format. The system can convert data as indicated in the following table.

Clipboard Format
Conversion Format
Platform Support
CF_BITMAP
CF_DIB
Windows NT, Windows 95
CF_DIB
CF_BITMAP
Windows NT, Windows 95
CF_DIB
CF_PALETTE
Windows NT, Windows 95
CF_ENHMETAFILE
CF_METAFILEPICT
Windows NT, Windows 95
CF_METAFILEPICT
CF_ENHMETAFILE
Windows NT, Windows 95
CF_OEMTEXT
CF_TEXT
Windows NT, Windows 95
CF_OEMTEXT
CF_UNICODETEXT
Windows NT
CF_TEXT
CF_OEMTEXT
Windows NT, Windows 95
CF_TEXT
CF_UNICODETEXT
Windows NT
CF_UNICODETEXT
CF_OEMTEXT
Windows NT
CF_UNICODETEXT
CF_TEXT
Windows NT

If the system provides a conversion between multiple formats, there is no advantage to placing multiple formats on the clipboard. When copying bitmaps, it is best to place only the CF_DIB format on the clipboard. This is because the colors in a device-dependent bitmap (CF_BITMAP) are relative to the system palette, which may change before the bitmap is pasted. If only the CF_DIB format is on the clipboard and a window requests the CF_BITMAP format, the system renders the device-dependent bitmap (DIB) using the current palette at that time.

If you place the CF_BITMAP format on the clipboard (and not CF_DIB), the system renders the CF_DIB clipboard format as soon as the clipboard is closed. This ensures that the correct palette is used to generate the DIB. Conversions between other clipboard formats occur upon demand.


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