我想在文本模式下更改字符串字体。
我尝试了很多中断，但它不起作用。
我在搜索中找不到好的结果。
谁能给我关于这个话题的好例子？
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正如您提到尝试中断，我们可以假设您的操作系统是 16 位（目前）？您对使用int 10h函数感兴趣吗？我也刚刚遇到了一些关于通过欺骗端口来做到这一点的文本（我无法告诉你如何使用这些东西......如果你的操作系统已经到达那里，它可能在 pmode 下工作）。使用图形模式和“绘制”字符也很有趣——文本不必在一条直线上，它可以“倾斜”。我有很多旧的 dos 程序对此进行了试验。不幸的是，我不记得哪个做了什么，而且我也没有心情去执行任务并寻找它们。:(
这是我可以从传说中的贝丝·斯通（Beth Stone）中得到的一个：
;From: "Beth"
; Balloon.asm
; (C)2K1 Beth (but donated to the public domain :)
;
; Simple .com file that demonstrates changing the
; video font for text mode 3 using the "official"
; BIOS interrupts for doing it...
;
; Note: mode 3 is a bit polymorphic in that the size
; of a character cell differs according to the video
; card...but, for modern VGAs and above, these will
; almost certainly have a 9x16 size character cell by
; default (but the older cards like CGA/EGA and such had
; a lower resolution and an 8x8 character cell)...that
; is, mode 3 is defined by the amount of character
; cells being 80x25 and the card alters the size of the
; character cell to make the resolution and this
; requirement correspond...
;
; As this is the case, I force the character cell to be
; 8x8 in this little program to make life easier in that
; I don't have to supply fonts for 8x8, 8x14, 8x16
; potential sizes...this, on a modern VGA and above,
; will force the number of rows on screen to 50 and
; produce shorter characters than usual...
;
; Finally, it's worth noting that the VGA(+) resolution
; of mode 3 is actually 720 pixels across rather than
; what you might assume of 640 (because we've 80
; columns each at 8 pixels wide and 80x8=640, which is
; not 720 :)...thus, these cards automatically insert
; a vertical gap of one pixel between the character
; cells (if you look at ASCII characters 176, 177,178
; and 219, you can see this in action...because
; although 219 is defined as "all pixels on" (a solid
; block) when you make a row of them, you'll see a gap
; between them...this you can see on my little balloon
; graphic also...
;
; Also, if you're going to run this from a DOS box in
; Windows, then you'll need to go into fullscreen mode
; because Windows _emulates_ text modes in a window
; and, thus, my little balloon won't show up (what's
; interesting, though, is that if you switch between
; fullscreen and a window with ALT + ENTER then you
; can see the difference...in fullscreen, you'll see
; the balloon but in a window, you'll just see weird
; extended ASCII characters)...
;
; Anyway, enough of these overly long comments (there's
; more comment here than actual program...hehehe ;)...
; let's get to some actual code...
;
; .model tiny
; .code
%define offset
section .text
org 100h
; Set the video mode to the standard text mode #3
;
Start: mov ax, 0003h
int 10h
; Load in the standard 8x8 ROM font...which also forces
; the video to use 8x8 character cells...
;
mov ax, 1112h
; int 10h
; Ok, let's load in my new font characters...
;
mov ax, 1110h
mov bx, 0800h
mov cx, 0007h
mov dx, 0080h
mov bp, offset NewFont
int 10h
; And let's print some characters to demonstrate my new
; font in action...
mov ax, 0900h
mov dx, offset Balloon
int 21h
; Goodbye program, hello DOS prompt!!!
; (i.e. call terminate program interrupt :)
;
mov ah, 4Ch
int 21h
Balloon db 0Ah, 0Dh, "Look! It's a balloon!", 0Ah, 0Dh
db "But, wait, we're in a text mode but that looks "
db "a lot like a graphic...", 0Ah, 0Dh,
db "how can this be?", 0Ah, 0Dh
db "Cool, huh? :)", 0Ah, 0Dh, 0Ah, 0Dh
db 128, 129, 130, 0Ah, 0Dh
db 131, 132, 133, 0Ah, 0Dh
db " ", 134, " ", 0Ah, 0Dh, 0Ah, 0Dh, "$"
; Here's the data for the new characters I'm
; defining...the format is a simple monochrome
; bitmap, where each bit in a byte represents a
; pixel (0 = off, 1 = on :) and there's 8 bytes
; to make up an 8x8 character...
;
; As I can't be bothered to calculate some interesting
; graphics of my own here, then I've loaned the already
; calculated values from the C64 user's guide for
; creating a balloon sprite (which, coincidentally,
; uses a similar format to the format I need here, so
; it saves time just to copy those values over rather
; than work out some of my own :)...just thought I'd
; explain why I've got a balloon with the Commodore
; logo on it as my graphic...the answer is simply that
; I was too lazy to sit with some graph paper and work
; out some values of my own...trust me, I've done it
; before on other occasions and it's a really long and
; tedious process :)...
;
NewFont db 0, 1, 3, 3, 7, 7, 7, 3
db 127, 255, 255, 231, 217, 223, 217, 231
db 0, 192, 224, 224, 240, 240, 240, 224
db 3, 3, 2, 1, 1, 0, 0, 0
db 255, 255, 255, 127, 62, 156, 156, 73
db 224, 224, 160, 64, 64, 128, 128, 0
db 73, 62, 62, 62, 28, 0, 0, 0
; end Start
由于这是在 Beht 的 Masm/Tasm 语法中发布的，并且我快速尝试将其转换为 Nasm 语法，因此其中一些看起来有点奇怪。我注意到我曾经评论过贝丝的int 10h。不记得为什么了。还是给你玩玩吧……
于 2013-07-23T07:28:37.817 回答