我作了一個Active Form ,加了一個TDataModule,並且能夠創建TDataModule
對象,但使用TDataModule,就會報錯:
"Access violation at address 06F5E9DB in module 'ZP.ocx' Read of address 0000005C"
到底Active Form 能否使用TDataModule,由該如何解決我的問題啊!!!!下面是代碼./////TDataModule部分
unit DM;interfaceuses
SysUtils, Windows, Messages, Classes, Graphics, Controls, Forms,
Dialogs, DBTables, DB, DBClient, MConnect, SConnect;type
TCDM = class(TDataModule)
DSMain: TDataSource;
CDstMain: TClientDataSet;
SkctConn: TSocketConnection;
DShead: TDataSource;
CDShead: TClientDataSet;
DSbody: TDataSource;
CDSbody: TClientDataSet;
DSother: TDataSource;
CDSother: TClientDataSet;
DSTbody: TDataSource;
CDSTbody: TClientDataSet;
DSNMF: TDataSource;
CDSNMF: TClientDataSet;
DSML: TDataSource;
CDSmL: TClientDataSet;
procedure DataModuleCreate(Sender: TObject);
private
{ Private declarations }
public
CDM_purheadid:double;
{ Public declarations }
end;var
CDM: TCDM;procedure CreatCDM;implementation
{$R *.dfm}
/////////////////////////////////////////////////////////////
/////用這個函數來創建,是否正確????
procedure CreatCDM;
begin
TCDM.Create(nil)
end;
/////////////////////////////////////////////////////////////
procedure TCDM.DataModuleCreate(Sender: TObject);
begin
Showmessage('CDM') ;//////////這個消息框出現過///////
end;
end.
///////////////在ActiveX Form 中調用的代碼。
//創建
procedure Tz.ActiveFormCreate(Sender: TObject);
begin
DM.TCDM.Create(nil);
end;
//使用
procedure Tz.BtnRenewClick(Sender: TObject);
var
sqltext:string;
begin
sqltext:=ue_makesql();
DM.CDM.CDstMain.Active:=false; /////<----到這裡就出錯!
DM.CDM.CDstMain.CommandText:=sqltext;
DM.CDM.CDstMain.Active:=true;
end;
/////////////////////到底是爲什麽,要如何解決阿???
對象,但使用TDataModule,就會報錯:
"Access violation at address 06F5E9DB in module 'ZP.ocx' Read of address 0000005C"
到底Active Form 能否使用TDataModule,由該如何解決我的問題啊!!!!下面是代碼./////TDataModule部分
unit DM;interfaceuses
SysUtils, Windows, Messages, Classes, Graphics, Controls, Forms,
Dialogs, DBTables, DB, DBClient, MConnect, SConnect;type
TCDM = class(TDataModule)
DSMain: TDataSource;
CDstMain: TClientDataSet;
SkctConn: TSocketConnection;
DShead: TDataSource;
CDShead: TClientDataSet;
DSbody: TDataSource;
CDSbody: TClientDataSet;
DSother: TDataSource;
CDSother: TClientDataSet;
DSTbody: TDataSource;
CDSTbody: TClientDataSet;
DSNMF: TDataSource;
CDSNMF: TClientDataSet;
DSML: TDataSource;
CDSmL: TClientDataSet;
procedure DataModuleCreate(Sender: TObject);
private
{ Private declarations }
public
CDM_purheadid:double;
{ Public declarations }
end;var
CDM: TCDM;procedure CreatCDM;implementation
{$R *.dfm}
/////////////////////////////////////////////////////////////
/////用這個函數來創建,是否正確????
procedure CreatCDM;
begin
TCDM.Create(nil)
end;
/////////////////////////////////////////////////////////////
procedure TCDM.DataModuleCreate(Sender: TObject);
begin
Showmessage('CDM') ;//////////這個消息框出現過///////
end;
end.
///////////////在ActiveX Form 中調用的代碼。
//創建
procedure Tz.ActiveFormCreate(Sender: TObject);
begin
DM.TCDM.Create(nil);
end;
//使用
procedure Tz.BtnRenewClick(Sender: TObject);
var
sqltext:string;
begin
sqltext:=ue_makesql();
DM.CDM.CDstMain.Active:=false; /////<----到這裡就出錯!
DM.CDM.CDstMain.CommandText:=sqltext;
DM.CDM.CDstMain.Active:=true;
end;
/////////////////////到底是爲什麽,要如何解決阿???
begin dm:=tdatamodule1.create(self);//在这里加上这句就搞定了。ok??? DM.TCDM.Create(nil);
end;
//使用
procedure Tz.BtnRenewClick(Sender: TObject);
var
sqltext:string;
begin
sqltext:=ue_makesql();
DM.CDM.CDstMain.Active:=false; /////<----到這裡就出錯!
//上面出错是因为Dm没有被创建实 例
DM.CDM.CDstMain.CommandText:=sqltext;
DM.CDM.CDstMain.Active:=true;
end;
Dm是Tcdm类的吧?
TCDM.Create(nil);
你光用这局话没有用,上一句话只是创建了一个实例,但是并没有将这个实例赋值给Dm,所以你用Dm来调用cdm之类的组件当然出错了。
只要:DM:=TCDM.Create(nil);就行了。