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Date Posted: 07:40:10 06/18/01 Mon
Author: Michel
Subject: Re: How to set the properties in BitmapInfoHeader before save a bitmap
In reply to: wto 's message, "How to set the properties in BitmapInfoHeader before save a bitmap" on 23:55:37 06/15/01 Fri


Hi,

The BitmapInfo property was intended as a read-only property.

What you can do is open up a TFileStream, seek to the appropriate file position in the file and write the value directly.

For example, this is what is done in procedure EnPcxGr.TPcxGraphic.SaveToStream to write the XDpi and YDpi values.

I don't recall the exact structure of a BMP file, but the bitmap info record is at the beginning of the file.

Best regards,

Michel

>Hi,
> Currently I create a TBitmapGraphic in memeory and I
>want
>to set its BitmapInfo.BmpHeader.biClrImportant
>property to
>a value and then save the TBitmapGraphic to a
>uncompressed bitmap file. (I want to create a windows
>logo).
> I try to set the property like this:
>BitmapGraphic.BitmapInfo.BmpHeader.biClrImportant :=
>MyColors;
> but find the bitmapinfo is readonly, how should I do?

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