Mega Code Archive
How to comunicate process spanned with WM_COPYDATA
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Title: How to comunicate process-spanned with WM_COPYDATA
// Sender: Send data
procedure TForm1.Button1Click(Sender: TObject);
var
aCopyData: TCopyDataStruct;
hTargetWnd: HWND;
begin
with aCopyData do
begin
dwData := 0;
cbData := StrLen(PChar(Edit1.Text)) + 1;
lpData := PChar(Edit1.Text)
end;
// Search window by the window title
hTargetWnd := FindWindowEx(0, 0, nil, PChar('WM_COPYDATA-Receiver'));
if hTargetWnd 0 then
SendMessage(hTargetWnd, WM_COPYDATA, Longint(Handle), Longint(@aCopyData))
else
ShowMessage('No Recipient found!');
end;
(* -------------------------------------------------------------------- *)
// Recipient - Receive data
type
TForm1 = class(TForm)
private
{ Private declarations }
procedure WMCopyData(var Msg: TWMCopyData); message WM_COPYDATA;
public
{ Public declarations }
end;
procedure TForm1.WMCopyData(var Msg: TWMCopyData);
var
sText: array[0..99] of Char;
begin
// generate text from parameter
StrLCopy(sText, Msg.CopyDataStruct.lpData, Msg.CopyDataStruct.cbData);
// write received text
label1.Caption := sText;
end;
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