使用 FASM 在汇编编程中打印
我正在尝试使用下面的代码打印一条消息：
org 100h
start:
jmp begin
begin:
mov ah, 9
mov dx, msg
msg db 'Ascii sign:.$'
int 21h
finish:
mov ax, 4c00h
int 21h
它能够编译，但根本不显示任何内容。但是，如果我将“msg db 'Ascii sign:.$'”行移到“jmp begin”下方，则可以显示该消息。
我想知道这背后的逻辑。我在哪里声明消息有什么不同吗？
这只是出于好奇，谢谢！
I am trying to print a message by using the code below:
org 100h
start:
jmp begin
begin:
mov ah, 9
mov dx, msg
msg db 'Ascii sign:.
It is able to compile but it display nothing at all. But if I move the line "msg db 'Ascii sign:.$'" below "jmp begin", the message is able to display.
I want to know the logic behind this. Does that make a difference where I declare the message ?
This is just out of curiosity, thank you!
int 21h
finish:
mov ax, 4c00h
int 21h
It is able to compile but it display nothing at all. But if I move the line "msg db 'Ascii sign:.$'" below "jmp begin", the message is able to display.
I want to know the logic behind this. Does that make a difference where I declare the message ?
This is just out of curiosity, thank you!
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是的。现在，
msg定义在代码中间，CPU 将尝试执行它。您通常希望在数据段中单独定义数据。我不记得 FASM 的语法，但使用 MASM 或 TASM，您通常会执行以下操作：Yes. Right now,
msgis defined in the middle of the code, where the CPU will attempt to execute it. You normally want to define data separately, in the data segment. I don't remember the syntax for FASM, but with MASM or TASM, you'd normally do something like this:如果您确实必须将字符串放在代码部分中，那么只需跳过它们即可。
If you really must have your strings in the code section, then just jump over them.