如何随机生成验证码？（主要代码）

来源：互联网发布：长虹网络电视怎么搜台编辑：程序博客网时间：2024/06/16 09:32

procedure PwdImg(img:Timage);

var
pwdimgstr : string;

procedure Tlogin.PwdImg(img:Timage);
var
I,j,k:   Integer;
vPoint:   TPoint;
vLeft:   Integer;
arrStr:array [1..36]of string ;
begin
pwdimgstr:='';
arrStr[1]:='0'; arrStr[2]:='1'; arrStr[3]:='2'; arrStr[4]:='3';
arrStr[5]:='4'; arrStr[6]:='5'; arrStr[7]:='6'; arrStr[8]:='7';
arrStr[9]:='8'; arrStr[10]:='9'; arrStr[11]:='A'; arrStr[12]:='B';
arrStr[13]:='C'; arrStr[14]:='D'; arrStr[15]:='E'; arrStr[16]:='F';
arrStr[17]:='G'; arrStr[18]:='H'; arrStr[19]:='I'; arrStr[20]:='J';
arrStr[21]:='K'; arrStr[22]:='L'; arrStr[23]:='M'; arrStr[24]:='N';
arrStr[25]:='O'; arrStr[26]:='P'; arrStr[27]:='Q'; arrStr[28]:='R';
arrStr[29]:='S'; arrStr[30]:='T'; arrStr[31]:='U'; arrStr[32]:='V';
arrStr[33]:='W'; arrStr[34]:='X'; arrStr[35]:='Y'; arrStr[36]:='Z';
for j:=1 to 4 do
begin
Randomize;
k:=strtoint(Format('%.1d',[Random(36)]));
pwdimgstr:=pwdimgstr+trim(arrStr[k])
end;
vLeft:=10;
img.picture:=nil;
for I:= 1 to Length(pwdimgstr) do
begin
with Img do
begin
    Canvas.Font.Size := Random(10)+ 9;
    Canvas.Font.Color := RGB(Random(256) and $C0,
    Random(256) and $C0,Random(256) and $C0);
      if Random(2)=1 then
        Canvas.Font.Style := [fsBold]
      else Canvas.Font.Style := [];
      begin
        Canvas.Font.Name := Screen.Fonts[10];
        vPoint.X := Random(4)+ vLeft;
        vPoint.Y := Random(5);
        Canvas.TextOut(vPoint.X,vPoint.Y,pwdimgstr[I]);
        vLeft := vPoint.X + Canvas.TextWidth(pwdimgstr[I]);
      end;
    end;
end;
end;