But yea, this is kinda pointless. However, if your C-program is run by a C-runtime that doesn't adhere to the standard, one shameful example would be PalmOS I'm quite sure there ought to be more , then free NULL would corrupt memory and crash the application.
You never know with what runtime on which platform other people will run your code. And yes, my program would just crash on strcpy if malloc fails there. Show 3 more comments. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Related 1. Hot Network Questions. Question feed. Accept all cookies Customize settings.
The following code works for me:. Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink. Saleh Mubashar - Jan 9. Shaan Alam - Jan 8. Hanane Kacemi - Jan 9. Unity Buddy - Jan 9. DEV Community is a community of , amazing developers We're a place where coders share, stay up-to-date and grow their careers. Create account Log in.
Twitter Facebook Github Instagram Twitch. In this tutorial we'll be seeing how to write a simple cyan colored bitmap image. Preview: The approach used in this tutorial is only compatible with systems that process data in little-endian byte format used in most Intel and AMD machines. Introduction to Binary File Formats A binary file is a collection of bits i.
Most binary files have two major portions: Header Header in a binary file contains meta data additional information about the data, for example width and height of an image.
Body The body of a binary file contains actual data. What is a Bitmap File? Upload image. I'm working on modernizing Rosetta Code's infrastructure. Starting with communications. Please accept this time-limited open invite to RC's Slack. Jump to: navigation , search. Library: Action! Bitmap tools. Works with : Fortran version 90 and later. Works with : Julia version 0. Library: Imager. Works with : Python version 3.
Library: pixmap. Works with : Rakudo version This post describes a means of taking data in the form of raw pixels containing RGB values as well as the image height, width and the number of bits per pixel 24 in this case and converting this into a bitmap BMP file.
For this example I did not have to worry about padding additional values. Since then I have made some improvements to the original code sample, specifically if the image data happens to be not DWORD-aligned, then a new data array is created and padded such that there will be enough bytes to reach the next DWORD.
The original task was to create a one-dimensional array of bytes representing pixel colour data from the two-dimensional adjacency matrix provided. Each pixel value was then set to black or white, depending on the matrix array value:. Writing the array data as a bitmap file is accomplished by the SaveBitmapToFile module.
This module essentially:. Creates a file handler and writes the file, bitmap info and pixel data into it to create the new bitmap file representation:. Open an input bitmap file 2. Obtain the raw BYTE array, image height and image width from the input bitmap file 3.
Create a new raw BYTE array, which will have space for additional padding if required 4. Save the new raw BYTE array to the new bitmap file. The program extracts the raw data from this and puts it into the buffer, example output of this buffer data:. It then creates the new BYTE array with any additional padding, if necessary, and the BYTE data is saved as a new bitmap file, as mentioned previously.
0コメント