在C编程中，“发射"是什么?做? [英] In C programming, what does "emit" do?

问题描述

最近，我试图扩展对C语言的了解，并且遇到了一个使用emit可能会 emit 字节的程序.

I recently tried to expand my knowledge of the C language and I came across a program that used emit, to possibly emit a byte.

__declspec(naked) void marker_begin() {
__asm {
    _emit 0x51;
    _emit 0x21;
    _emit 0x1A;
    _emit 0x14;
    _emit 0x2C;
    _emit 0x5B;
}

}

这可以用来做什么? 预先感谢.

What could this be used for? Thanks in advance.

推荐答案

您的C程序正在使用_asm关键字执行内联汇编代码. _asm是MSDN中使用的Microsoft特定关键字. __asm关键字调用内联汇编器.它后面必须是汇编指令，用大括号括起来的一组指令，或者至少是一对空括号.

Your C program is executing inline assembly code by using the _asm keyword. _asm is a Microsoft specific keyword used in MSDN. The __asm keyword invokes the inline assembler. It must be followed by an assembly instruction, a group of instructions enclosed in braces, or, at least, an empty pair of braces.

_emit伪指令类似于MASM的DB指令. _emit是MSDN特定的伪指令. _emit用于在当前文本段的当前位置定义单个立即字节. _emit一次只能定义一个字节，并且只能在文本段中定义.

The _emit pseudo instruction is similar to the DB directive of MASM. _emit is an MSDN specific pseudo instruction. _emit is used to define a single immediate byte at the current location in the current text segment. _emit can define only one byte at a time and only in the text segment.

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