如何做到这人code＆QUOT;的Hello World＆QUOT;与微软画图？ [英] How did this person code "Hello World" with Microsoft Paint?

问题描述

我刚才已经看到了这一点在过去几天无法弄清楚它是如何工作。我谈的视频这里：

I have just seen this within the past few days and cannot figure out how it works. The video I talk about is here:

这是<一个href=\"http://stackoverflow.com/questions/5508110/why-is-this-program-erroneously-rejected-by-three-c-compilers/5509538#5509538\">the从这个堆栈溢出问题最受好评的答案：<一href=\"http://stackoverflow.com/questions/5508110/why-is-this-program-erroneously-rejected-by-three-c-compilers/5509143\">Why在这个计划由三个编译器拒绝？

这是怎么回事位图能够显示的Hello WorldC ++程序？

How is this bitmap able to show a C++ program for "Hello World"?

推荐答案

一个BMP（DIB）图像由报头后面uncom pressed ¹ 颜色的数据（24 BPP图像组成它的每个像素3个字节，存储在反向行顺序和​​4字节行的步伐）。

A BMP (DIB) image is composed by a header followed by uncompressed¹ color data (for 24 bpp images it's 3 bytes per pixel, stored in reverse row order and with 4 bytes row stride).

有彩色数据的字节被用于重新present颜色（即其中没有被授权，由文件格式 ² ，它们都来自每个像素的颜色），并有一个完美的1：像素颜色和书面文件中的字节之间1的对应关系;因此，使用完美挑选的颜色，你可以实际编写任何你想要的文件中（用头除外）。

The bytes for color data are used to represent colors (i.e. none of them are "mandated" by the file format², they all come from the color of each pixel), and there's a perfect 1:1 correspondence between pixel colors and bytes written in the file; thus, using perfectly chosen colors you can actually write anything you want in the file (with the exception of the header).

当你用记事本打开生成的文件，颜色数据将显示为文本;你可以还清楚地从头部看（部分从 BM 文本的开始），由文件格式授权。

When you open the generated file in notepad, the color data will be shown as text; you can still clearly see from the header (the part from BM to the start of the text), that is mandated by the file format.

在我看来这个视频做是这样的：首先笔者计算出所需的位图的大小，创造充满扩展为一个简单的图案颜色正确尺寸的DIB文件（例如所有字节65 => 'A'）;然后代替，例如图案的有效载荷code，如图视频

In my opinion this video was done this way: first the author calculated the size needed for the bitmap, and created a DIB file of the correct size filled with a color that expands to a simple pattern (e.g. all bytes 65 => 'A'); then replaced such pattern with the "payload" code, as shown in the video.

易发。

关于DIB格式更多信息

1. 有RLE玉米pressed的DIB，但在这种情况下uncom $ P $用于pssed位图（和它们用于真很少反正）。


2. 随着步幅的例外，这是使用的4字节的行的多个避免。

这篇关于如何做到这人code＆QUOT;的Hello World＆QUOT;与微软画图？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！