在五月麦田的帮助下做成了,感觉挺好,验证码输入的时候需要大写:
组件:LabelEdit 3个 Button 2个 image 1个。
代码如下:
unit Unit1;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls;
type
TForm1 = class(TForm)
Image1: TImage;
LabeledEdit1: TLabeledEdit;
LabeledEdit2: TLabeledEdit;
LabeledEdit3: TLabeledEdit;
Button1: TButton;
Button2: TButton;
procedure Button2Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure Image1Click(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
function DrawImg(img: TImage): string;
public
{ Public declarations }
end;
var
Form1: TForm1;
var
str:string;
implementation
{$R *.dfm}
function TForm1.DrawImg(img: TImage): string; //画出验证码函数
var
I,j,k: Integer;
vPoint: TPoint;
vLeft: Integer;
arrStr:array [1..36]of string ;
strResult: string;
begin
strResult := '';
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)]));
strResult := strResult + trim(arrStr[k])
end;
vLeft := 10;
img.picture := nil;
for I := 1 to Length(strResult) 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 $C0);
if Random(2)=1 then
Canvas.Font.Style := [fsBold]
else Canvas.Font.Style := [];
begin
Canvas.Font.Name := Screen.Fonts[10];
vPoint.X := Random(4)+ vLeft;
vPoint.Y := Random(5);
Canvas.TextOut(vPoint.X, vPoint.Y,strResult[I]);
vLeft := vPoint.X + Canvas.TextWidth(strResult[I]);
end;
end;
end;
result := strResult; //返回值
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
str := DrawImg(Image1);
end;
procedure TForm1.Image1Click(Sender: TObject);
begin
str := DrawImg(Image1);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
if (LabeledEdit1.Text = 'Hello') and (LabeledEdit2.Text = 'world') and (LabeledEdit3.Text = str) then
MessageBox(Handle, '登陆成功!', '提示', MB_OK);
if LabeledEdit1.Text <> 'Hello' then
begin
MessageBox(Handle, '用户名错误,请重新输入!', '提示', MB_OK);
LabeledEdit1.Text := '';
LabeledEdit2.Text := '';
LabeledEdit3.Text := '';
str := DrawImg(Image1);
end
else if LabeledEdit2.Text <> 'world' then
begin
MessageBox(Handle, '密码错误,请重新输入!', '提示', MB_OK);
LabeledEdit1.Text := '';
LabeledEdit2.Text := '';
LabeledEdit3.Text := '';
str := DrawImg(Image1);
end
else if LabeledEdit3.Text <> str then
begin
MessageBox(Handle, '验证码错误,请重新输入!', '提示', MB_OK);
LabeledEdit1.Text := '';
LabeledEdit2.Text := '';
LabeledEdit3.Text := '';
str := DrawImg(Image1);
end;
end;
procedure TForm1.Button2Click(Sender: TObject); //退出
begin
close;
end;
end.
其实也可以这样写:
代码如下:
unit Unit1;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls;
type
TForm1 = class(TForm)
Image1: TImage;
Button1: TButton;
Edit1: TEdit;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var
arrStr:array [1..36]of string ;
begin
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';
Image1.Canvas.TextOut(5 ,5,arrStr[random(36)]);
Image1.Canvas.TextOut(25,5,arrStr[random(36)]);
Image1.Canvas.TextOut(45,5,arrStr[random(36)]);
Image1.Canvas.TextOut(65,5,arrStr[random(36)]);
end;
end