unit Unit1;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;type
TForm1 = class(TForm)
Button1: TButton;
procedure WMNCHitTest(var msg : TMessage); message WM_NCHITTEST;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
begin
close;
end;procedure WMNCHitTest(var msg : TMessage);
begin
inherited; //编译到这里的时候就出错了
msg.Result:=HTCLIENT;
end;end.
以上代码是现实禁止窗体右上角各按钮,我是书上一模一样写的,但是为什么会出错呢?请赐教
而且不仅是这个程序在调用消息响应函数的时候出错,在调用其它消息响应函数的时候,也是这个地方编译的时候出错
出错信息为:
[Error] Unit1.pas(34): This form of method call only allowed in methods of derived types
[Error] Unit1.pas(12): Unsatisfied forward or external declaration: 'TForm1.WMNCHitTest'
[Fatal Error] Project1.dpr(5): Could not compile used unit 'Unit1.pas'
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;type
TForm1 = class(TForm)
Button1: TButton;
procedure WMNCHitTest(var msg : TMessage); message WM_NCHITTEST;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
begin
close;
end;procedure WMNCHitTest(var msg : TMessage);
begin
inherited; //编译到这里的时候就出错了
msg.Result:=HTCLIENT;
end;end.
以上代码是现实禁止窗体右上角各按钮,我是书上一模一样写的,但是为什么会出错呢?请赐教
而且不仅是这个程序在调用消息响应函数的时候出错,在调用其它消息响应函数的时候,也是这个地方编译的时候出错
出错信息为:
[Error] Unit1.pas(34): This form of method call only allowed in methods of derived types
[Error] Unit1.pas(12): Unsatisfied forward or external declaration: 'TForm1.WMNCHitTest'
[Fatal Error] Project1.dpr(5): Could not compile used unit 'Unit1.pas'
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TForm1 = class(TForm)
Button1: TButton; private //---------------------改
{ Private declarations }
procedure WMNCHitTest(var msg : TMessage); message WM_NCHITTEST;
procedure Button1Click(Sender: TObject);
public
{ Public declarations }
end;
procedure TForm1.WMNCHitTest(var msg : TMessage); //---------------------改
begin
inherited; //编译到这里的时候就出错了
msg.Result:=HTCLIENT;
end;