The information in this article applies to:
SYMPTOMSIn a Windows 3.1 printing application, calling the PALETTEINDEX macro to select a color when drawing lines 1 pixel wide results in the printer drawing black lines no matter what color index was selected from the logical palette. CAUSEWhen the PALETTEINDEX macro is used, a COLORREF value is returned. The palette-entry index is placed in the low-order byte and a 1 is placed in the high-order byte. When a pen is created with the CreatePen function and a width of 0 (1 device unit) is placed in the nWidth field and a COLORREF value returned from PALETTEINDEX is placed in the clrref field, the pen is always black. The Hewlett-Packard (HP) PaintJet driver does not correctly handle pens with a width of 1 pixel when a color is selected with PALETTEINDEX and the high-order word of the COLORREF value is one (1). RESOLUTION
Instead of using the PALETTEINDEX macro, you can use the PALETTERGB macro to reference colors in your currently selected palette. Sometimes, this may not be desirable because you would have to know all of the RGB values of all indices in your logical palette. In that case, you could use the GetPaletteEntries() function to retrieve the RGB values of the desired logical palette index and call the PALETTERGB macro with those values.
STATUSMicrosoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. Additional query words: buglist3.10 3.10
Keywords : kbWinOS310 kbDSupport kbSDKWin16 |
Last Reviewed: July 7, 1999 © 2000 Microsoft Corporation. All rights reserved. Terms of Use. |