我有两个应用程序,它们与消息通信,如果我运行两个编译的exe,一切都按预期工作.但是当我从delphi ide运行(调试)发送器(bds2006,没有运气时尝试使用delphi 7)时,sendmessage不会发送任何内容.
似乎ide会阻止向其他应用程序发送消息.
我在win7 64bit和borland 2006上使用WM_COPYDATA.
任何的想法？
寄件人：
procedure TForm1.Button1Click(Sender: TObject);
var dst: THandle;
stringToSend : string;
copyDataStruct : TCopyDataStruct;
begin
stringToSend := 'Hello';
copyDataStruct.dwData := 0; //use it to identify the message contents
copyDataStruct.cbData := 1 + Length(stringToSend) ;
copyDataStruct.lpData := PChar(stringToSend) ;
SendData(copyDataStruct) ;
end;
procedure TForm1.SendData(const copyDataStruct: TCopyDataStruct) ;
var
receiverHandle : THandle;
res : integer;
begin
receiverHandle := findwindow( pchar('TForm2'),pchar('Form2') );
if receiverHandle = 0 then
begin
ShowMessage('CopyData Receiver NOT found!') ;
Exit;
end;
res := SendMessage(receiverHandle,WM_COPYDATA,Integer(Handle),Integer(@copyDataStruct)) ;
end;
end.
接收方部分：
TForm2 = class(TForm)
private
procedure WMCopyData(var Msg: TWMCopyData ); message WM_COPYDATA;
public
end;
var
Form2: TForm2;
implementation
{$R *.dfm}
{ TReceiver }
procedure TForm2.WMCopyData( var Msg: TWMCopyData );
begin
ShowMessage( 'Received' );
end;
解决方法
这是一个疯狂的猜测.您正在运行以管理员身份接收邮件的应用程序.在Vista及更高版本中,完整性级别保护可以阻止向具有更高完整性级别的进程传递消
从SendMessage文档：
Message sending is subject to UIPI (User Interface Privilege Isolation). The thread of a process can send messages only to message queues of threads in processes of lesser or equal integrity level.