调用Handle函数系统报错,可已经在USES中加入了Windows,
程序中有如下语句:SendMessage(Handle,Message.Msg,Message.WParam,Message.LParam);
错误信息:
[Error] Unit1.pas(40): Undeclared identifier: 'Handle'
[Error] Unit1.pas(20): Unsatisfied forward or external declaration: 'TForm1.MouseWheel'
[Fatal Error] Project1.dpr(5): Could not compile used unit 'Unit1.pas'
程序中有如下语句:SendMessage(Handle,Message.Msg,Message.WParam,Message.LParam);
错误信息:
[Error] Unit1.pas(40): Undeclared identifier: 'Handle'
[Error] Unit1.pas(20): Unsatisfied forward or external declaration: 'TForm1.MouseWheel'
[Fatal Error] Project1.dpr(5): Could not compile used unit 'Unit1.pas'
unit Unit1;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DB, ADODB, ExtCtrls, DBCtrls, Grids, DBGrids ;type
TForm1 = class(TForm)
DBGrid1: TDBGrid;
DBNavigator1: TDBNavigator;
ADOTable1: TADOTable;
DataSource1: TDataSource; private
{ Private declarations }
public
{ Public declarations }
procedure MouseWheel(var Message: TMessage); end;var
Form1: TForm1;implementation{$R *.dfm}procedure MouseWheel(var Message: TMessage);
begin
Message.Msg := WM_KEYDOWN;
Message.lParam := 0;if Message.WParam > 0 then
Message.WParam := VK_UP
else
Message.WParam := VK_DOWN;SendMessage(form1.Handle,Message.Msg,Message.WParam,Message.LParam);end;end.
procedure Tform1.MouseWheel(var Message: TMessage);//这是方法。要加限定
应该是
procedure TForm1.MouseWheel(var Message: TMessage);其他的没问题了,改为Form1.Handle是对的
改过以后,程序可以运行,但不知怎么回事,用MOUSE的滚轮还是不能使DBGRID1组件的竖滚动条,用鼠标的滚轮可以滚动