Question

delphi中运用输入消息框inputbox如何限制只能输入数字？

Answer 1

先备份Dialogs.pas单元.
然后在Dialogs.pas单元下找到function InputQuery,然后修改改下边的.最后删除Dialogs.dcu文件.重新编译一下就可以了.网上找到的答案.你试下.
function InputQuery(const ACaption, APrompt: string;
var Value: string): Boolean;
var
Form: TForm;
Prompt: TLabel;
Edit: TEdit;
fstyle: dWord; //
DialogUnits: TPoint;
ButtonTop, ButtonWidth, ButtonHeight: Integer;
begin
Result := False;
Form := TForm.Create(Application);
with Form do
try
Canvas.Font := Font;
DialogUnits := GetAveCharSize(Canvas);
BorderStyle := bsDialog;
Caption := ACaption;
ClientWidth := MulDiv(180, DialogUnits.X, 4);
ClientHeight := MulDiv(63, DialogUnits.Y, 8);
Position := poScreenCenter;
Prompt := TLabel.Create(Form);
with Prompt do
begin
Parent := Form;
Left := MulDiv(8, DialogUnits.X, 4);
Top := MulDiv(8, DialogUnits.Y, 8);
Width := 160; // 保证中文显示没问题
AutoSize := False;
Caption := APrompt;
end;
Edit := TEdit.Create(Form);
with Edit do
begin
Parent := Form;
Left := Prompt.Left;
Top := MulDiv(19, DialogUnits.Y, 8);
Width := MulDiv(164, DialogUnits.X, 4);
MaxLength := 255;
// PasswordChar:='*'; // 密码方式输入
Text := Value;
SelectAll;
end;
fstyle := GetWindowLong(Edit.Handle, GWL_STYLE); //
SetWindowLong(Edit.Handle, GWL_STYLE, fstyle or ES_NUMBER); //
ButtonTop := MulDiv(41, DialogUnits.Y, 8);
ButtonWidth := MulDiv(50, DialogUnits.X, 4);
ButtonHeight := MulDiv(14, DialogUnits.Y, 8);
with TButton.Create(Form) do
begin
Parent := Form;
Caption := '确定'; // SMsgDlgOK; // 改成中文
ModalResult := mrOk;
Default := True;
SetBounds(MulDiv(38, DialogUnits.X, 4), ButtonTop, ButtonWidth,
ButtonHeight);
end;
with TButton.Create(Form) do
begin
Parent := Form;
Caption := '取消'; SMsgDlgCancel; // 改成中文
ModalResult := mrCancel;
Cancel := True;
SetBounds(MulDiv(92, DialogUnits.X, 4), ButtonTop, ButtonWidth,
ButtonHeight);
end;
if ShowModal = mrOk then
begin
Value := Edit.Text;
Result := True;
end;
finally
Form.Free;
end;
end;

Answer 2

加一个输入的函数 if not (key in ['0'..'9',#8]) then key := #0;

Answer 3

I don`t know

Answer 4

自己做一个窗体呗~不建议去修改系统的东西