Solved

Saving a bitmap on file

Posted on 2001-09-10
7
240 Views
Last Modified: 2013-12-03
Hi ALL !!!
   Last 2 days I'm struggling to save the bmp on the file.The main problem with my code is when I use DIBSECTION structure to get the values of the bmp structures the value obtained are correct but when I use BITMAPINFO structure the value are incorrect. I am refferencing DIBLLOKEX code which is on codeguru site for saving the bmp. Every other things are proper(size, height, width of the saved bmp) except that when i open this saved file it shows only a block rectangle of the same size that of the bmp which i saved.
  I guess this is because the bit values are not correctly stored. Can anybody tell me how to get the bit values from the DIBSECTION structure? I've tried "GetBitmapBits" API but still giving the same problem.
  The bitmap is 256 bits.

Thanks in advance
Nitin
0
Comment
Question by:nitinkale
  • 2
7 Comments
 
LVL 9

Expert Comment

by:Pacman
ID: 6470303
>> I guess this is because the bit values are not correctly stored.

You can check this by viewing the file with hex editor.
What is the color depth of the bitmap ?
0
 
LVL 5

Accepted Solution

by:
FengYuan earned 100 total points
ID: 6475754
1) From DIBSECTION.dsBmih you have BITMAPINFOHEADER
2) From GetDIBColorTable, you get RGBQUAD array
3) From DIBSECTION.dsBm.bmBits, you get pointer to the pixel array.

Add BITMAPFILEHEADER, you get a complete .BMP file

Feng Yuan www.fengyuan.com
0
 
LVL 1

Expert Comment

by:dspector
ID: 6484796
You can store simply and directly by converting your HBITMAP to a DIB in a memory block, then storing the memory block to a file. DIB format is the same whether in memory or in a file, since it is device independent.

Let me know if you need working code.

David
0
 
LVL 9

Expert Comment

by:Pacman
ID: 6486720
>> The bitmap is 256 bits

I guess you mean 256 colors.
I asked for the color depth because if you use 256 colors then you'll have to store a color palette in your bitmap file.
Maybe you wrote an "empty" palette to the file.

0

Featured Post

Free Trending Threat Insights Every Day

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

Join & Write a Comment

This tutorial is about how to put some of your C++ program's functionality into a standard DLL, and how to make working with the EXE and the DLL simple and seamless.   We'll be using Microsoft Visual Studio 2008 and we will cut out the noise; that i…
If you have ever found yourself doing a repetitive action with the mouse and keyboard, and if you have even a little programming experience, there is a good chance that you can use a text editor to whip together a sort of macro to automate the proce…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
This video discusses moving either the default database or any database to a new volume.

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now