Delphi中使用汇编例子
-----也是大二的，接着上一个例子。呵呵，程序当时写的有点乱，请原谅：）。
Delphi中使用汇编进行混合编程，是异乎寻常的方便。如此，当你希望得到效率的时候，你可选择汇编，然而大部分工作，你仍是享受着可视化、面向对象编程的方便。delphi的语言，通过使用asm...end程序段写汇编代码部分，在汇编代码段中可以调用高级语言的变量；你需要注意的是，保护某些寄存器变量，然后呢，某些细节和dos下的汇编不同。大家看这个例子。
先大体说说一些小知识：
一，Delphi调用汇编，有两种方式。
一如---
PRocedure TForm1.DrawRain;
var
x1,y1,x2,y2,d,i:integer;
begin//delphi程序开始
for i:=0 to 100 do
begin
x1:=random(537);
y1:=random(280);
d:=random(7);
asm//内嵌汇编开始
push eax
mov eax,x1
sub eax,d
mov x2,eax
mov eax,y1
add eax,d
mov y2,eax
pop eax
end;;//内嵌汇编结束
times:=times+1;
drawLine2(x1,y1,x2,y2,clmedGray);
wait();
if (i div 2)=0 then drawLine2(x1,y1,x2,y2,clwindow);
end;
end;//delphi程序结束
还有一种，把外层的begin...end去掉，通过asm...end直接进入汇编。
procedure TForm1.Wait();
asm//内嵌汇编开始
push eax
mov eax,0
@loop:
add eax,1
cmp eax,1000000
jnz @loop
pop eax
end;//内嵌汇编结束
二，在汇编中使用delphi的变量
大家看第一段代码的例子，很容易明白：
asm//内嵌汇编开始
push eax
mov eax,x1 //x1是delphi局部变量，此处用作值
sub eax,d
mov x2,eax //x2是delphi局部变量，又用作内存地址
mov eax,y1
add eax,d
mov y2,eax
pop eax
end;;//内嵌汇编结束
三，汇编的不同细节
例子不帖了，大家自己比较了，如
@loop:
//...
jnz @loop
另外，大部分int中断可能不能用，我没有试通，也没见什么资料上介绍过。谁知道，给我发个消息好吗？谢谢了先。
下面是一个比较大的例子，是一个动画效果。因为以前刚开始学这方面的知识，做的很粗糙。是一个小树林里，不停的下着雨的场景---很多问题，表现突出的是，首先浮点指令没有会用（我在后面会附上有待继续尝试的浮点数指令的测试例子），一些算法当时还不会，结果画面比较单调，其次，对景物间的协调不够好，比如树没有有效保护，后来就被雨“花”了：）。
可还是做例子了，大家别笑我，一来没时间写这方面的例子了，二来，学Delphi中的汇编使用，它还是可以说明某些问题的。而且，一般的资料上，是回避这个应用的，个别的高级编程中，偶尔提及，可大家要想掌握，大都得要自己多实践，这个例子可以个给你许多教训：）。
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ExtCtrls, Menus, ExtDlgs, FileCtrl, StdCtrls, ComCtrls, ImgList;
type
TForm1 = class(TForm)
MainMenu1: TMainMenu;
File1: TMenuItem;
Exit1: TMenuItem;
N1: TMenuItem;
Help1: TMenuItem;
About1: TMenuItem;
g1: TMenuItem;
Spring1: TMenuItem;
Summer1: TMenuItem;
Autumn1: TMenuItem;
Winter1: TMenuItem;
StatusBar1: TStatusBar;
ext1: TMenuItem;
Timer1: TTimer;
procedure Exit1Click(Sender: TObject);
procedure About1Click(Sender: TObject);
procedure Spring1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure Summer1Click(Sender: TObject);
procedure Autumn1Click(Sender: TObject);
procedure Winter1Click(Sender: TObject);
procedure ext1Click(Sender: TObject);
private
procedure DrawLine1(x1,y1,x2,y2:integer;icolor:TColor);// x2>x1 and y2>y1
procedure DrawLine2(x1,y1,x2,y2:integer;icolor:TColor);// x2<x1 and y2>y1
procedure DrawLine3(x1,y1,x2,y2:integer;iColor:TColor);// x1=x2 or y1=y2
procedure DrawRain;
procedure DrawTree(x,y,height:integer);
procedure Timer1Timer(sender:TObject);
procedure drawClear;
procedure Wait();
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
times:single;
implementation
uses Unit3,Unit5;
{$R *.dfm}
procedure TForm1.Wait();
asm
push eax
mov eax,0
@loop:
add eax,1
cmp eax,1000000
jnz @loop
pop eax
end;
procedure TForm1.DrawLine1(x1,y1,x2,y2:integer;iColor:TColor);
const i:integer=1;
var j,k1,k2,d:integer;
begin
if((x2-x1)<=0)or((y2-y1)<=0) then exit;
for j:=0 to (x2-x1) do
begin
form1.Canvas.Pen.Color:=icolor;
form1.Canvas.Ellipse(x1,y1,x1+2,y1+2);
form1.Canvas.Ellipse(x1-1,y1-1,x1+1,y1+1);
if ((x2-x1)=0)or((y2-y1)=0) then exit;
asm
push eax
push ebx
push ecx
push edx
mov ecx,0
mov eax,x2
sub eax,x1
mov ebx,y2
sub ebx,y1
mov d,ebx
mov edx,0
div d
mov k2,eax
mov eax,y2
sub eax,y1
mov ebx,x2
sub ebx,x1
mov d,ebx
mov edx,0
div d
mov k1,eax
mov eax,x1
@loop2:
add eax,i
inc ecx
cmp ecx,k2
jb @loop2
mov x1,eax
mov eax,y1
@loop1:
add eax,i
inc ecx
cmp ecx,k1
jb @loop1
mov y1,eax
pop edx
pop ecx
pop ebx
pop eax
end;
end;// end for
end;
procedure TForm1.DrawLine2(x1,y1,x2,y2:integer;icolor:TColor);
const i:integer=1;
var j,k1,k2,d:integer;
begin
if((x1-x2)<=0)or((y2-y1)<=0) then exit;
for j:=0 to (x1-x2) do
begin
form1.Canvas.Pen.Color:=icolor;
form1.Canvas.Ellipse(x1,y1,x1+2,y1+2);
form1.Canvas.Ellipse(x1-1,y1-1,x1+1,y1+1);
if ((x1-x2)=0)or((y2-y1)=0) then exit;
asm
push eax
push ebx
push ecx
push edx
mov ecx,0
mov eax,x1
sub eax,x2
mov ebx,y2
sub ebx,y1
mov d,ebx
mov edx,0
div d
mov k2,eax
mov eax,y2
sub eax,y1
mov ebx,x1
sub ebx,x2
mov d,ebx
mov edx,0
div d
mov k1,eax
mov eax,x1
@loop2:
sub eax,i
inc ecx
cmp ecx,k2
jb @loop2
mov x1,eax
mov eax,y1
@loop1:
add eax,i
inc ecx
cmp ecx,k1
jb @loop1
mov y1,eax
pop edx
pop ecx
pop ebx
pop eax
end;
end;// end for
end;
procedure TForm1.DrawLine3(x1,y1,x2,y2:integer;icolor:TColor);
var j:integer;
begin
if((x2-x1)<>0)and((y2-y1)<>0) then exit;
if (x2-x1)=0 then
for j:=0 to (y2-y1) do
begin
form1.Canvas.Pen.Color:=icolor;
form1.Canvas.Ellipse(x1-1,y1-1,x1+1,y1+1);
if (y2-y1)=0 then exit;
asm
push eax
mov eax,y1
inc eax
mov y1,eax
pop eax
end;
end// end for
else for j:=0 to (x2-x1) do
begin
form1.Canvas.Pen.Color:=icolor;
form1.Canvas.Ellipse(x1-1,y1-1,x1+1,y1+1);
if (x2-x1)=0 then exit;
asm
push eax
mov eax,x1
inc eax
mov x1,eax
pop eax
end;
end;// end for
end;
procedure TForm1.Timer1Timer(sender:TObject);
begin
end;
procedure TForm1.DrawRain;
var
x1,y1,x2,y2,d,i:integer;
begin
for i:=0 to 100 do
begin
x1:=random(537);
y1:=random(280);
d:=random(7);
asm
push eax
mov eax,x1
sub eax,d
mov x2,eax
mov eax,y1
add eax,d
mov y2,eax
pop eax
end;
times:=times+1;
drawLine2(x1,y1,x2,y2,clmedGray);
wait();
if (i div 2)=0 then drawLine2(x1,y1,x2,y2,clwindow);
end;
end;
procedure TForm1.DrawTree(x,y,height:integer);
var
x1,y1,x2,y2,x3,y3,x4,y4,x5,y5,d1:integer;
begin
asm
push eax
push ebx
push ecx
push edx
mov eax,height
mov edx,0
mov ecx,2
div ecx
mov d1,eax
mov eax,x
mov ebx,y
sub eax,height
mov x1,eax
sub ebx,height
mov y1,ebx
add eax,height
sub eax,5
sub ebx,height
mov x2,eax
mov y2,ebx
mov eax,x
add eax,3
sub ebx,height
mov x3,eax
mov y3,ebx
add eax,8
add ebx,height
mov x4,eax
mov y4,ebx
add eax,height
sub eax,5
add ebx,height
mov x5,eax
mov y5,ebx
pop edx
pop ecx
pop ebx
pop eax
end;
DrawLine2(x3,y3,x2-d1,y2,clcream);
DrawLine1(x3,y3,x4+d1,y4,clcream);
drawline3(x2-d1,y2,x2,y2,clcream);
drawline3(x4,y4,x4+d1,y4,clcream);
DrawLine2(x2,y2,x1,y1,clcream);
DrawLine1(x4,y4,x5,y5,clcream);
DrawLine2(x2+2,y2,x1,y1+2,clcream);
DrawLine1(x4-2,y4,x5,y5+2,clcream);
drawline3(x1,y1,x5,y5,clcream);
drawline3(x1,y1-1,x5,y5-1,clcream);
drawline3(x,y5,x,y,clcream);
drawline3(x,y,x+5,y,clcream);
drawline3(x+5,y5,x+5,y,clcream);
form1.Canvas.Brush.Color:=clgreen;
form1.Canvas.FloodFill(x,y1-5,clcream,fsBorder);
form1.Canvas.FloodFill(x+2,y-5,clcream,fsBorder);
end;
procedure TForm1.Exit1Click(Sender: TObject);
begin
close;
end;
procedure TForm1.About1Click(Sender: TObject);
begin
form3.Show;
end;
procedure TForm1.Spring1Click(Sender: TObject);
var i,k,j:integer;
begin
StatusBar1.Panels[1].text:='风雨之春...';
form1.Canvas.Brush.Color:=clwindow;
form1.Canvas.FloodFill(1,1,clred,fsBorder);
for i:=0 to 10do
begin
k:=random(10);
j:=random(10);
j:=-j;
drawTree(10+k*50,300+j*20,20);
end;
for i:=0 to 10 do
begin
form1.Canvas.Brush.Color:=clwindow;
form1.Canvas.FloodFill(1,1,clgreen,fsBorder);
drawRain;
sleep(100);
end;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
times:=0;
form1.canvas.Brush.Color:=clwindow;
form1.caption:=form1.caption+' Please select the Pictype!... ';
end;
procedure TForm1.drawClear;
var i,k:integer;
begin
form1.Canvas.Brush.Color:=clblack;
form1.Canvas.FloodFill(15,15, clcream, fsBorder);
for i:=0 to 5 do
begin
k:=random(300);
DrawLine3(20+k,1,20+k,307,clyellow);
DrawLine3(200+k,1,200+k,307,clyellow);
end;
end;
procedure TForm1.Summer1Click(Sender: TObject);
begin
drawClear;
form1.Canvas.Font.Color:=clblue;
form1.Canvas.Font.Size:=18;
form1.canvas.textOut(150,150,'绿色海洋...休整时间^_^！');
//DrawTree;
end;
procedure TForm1.Autumn1Click(Sender: TObject);
begin
drawClear;
form1.Canvas.Font.Color:=clblue;
form1.Canvas.Font.Size:=18;
form1.canvas.textOut(150,150,'红叶香山...正在休整^_^！');
end;
procedure TForm1.Winter1Click(Sender: TObject);
//var i,x,y:integer;
begin
drawClear;
form1.Canvas.Font.Color:=clblue;
form1.Canvas.Font.Size:=18;
form1.canvas.textOut(150,150,'银蛇腊象...暂不开放^_^！');
end;
procedure TForm1.ext1Click(Sender: TObject);
begin
form5.Show;
end;
end.
下面是附带的使用浮点数指令的测试程序，当时的原本，未达到效果的：）：
//指令图书馆查的：）
procedure Tform1.xx;
var
xmax,ymax,x,y,a,b:single;
i,z:integer;
begin
a:=2.0;b:=10.0;
xmax:=image1.Width;
ymax:=image1.Height;
for i:=0 to image1.Width do
begin
asm
//.80x87
finit
fld xmax //push xmax in st(0)
fdiv a
fchs //let st(0)=-st(0)
fadd i //st(0)=st(0)+i
fdiv b //st(0)=st(0)/b
fstp x //put st(0) in x without pop
fld x
fmul x
fchs
fadd ymax
//frndint
//fabs
fstp y
end;
x:=(i-xmax/2)/10;
y:=-x*x+ymax;
z:=trunc(z);
image1.canvas.Ellipse(i-1,trunc(y)-1,i+1,trunc(y)+1);
//image1.Canvas.Pixels[x,y];
end;
end;
选的是其中一个过程，呵呵，见笑了。
大家不妨把自己的东西拿出来，经验说一说，我准备洗耳恭听：）。
请----