Title: Extending the MessageBox function
Question: This code allows you to add a custom icon to the MessageBox function. You don't have to be restricted to the four common ico
images provided by windows anymore..
Answer:
{
IconResourceName is the name of the icon to use as a custom image. By default
a delphi project has only 1 icon resource - called 'MAINICON'. To add images,
use the Image Editor to insert icons into the project's .RES file.
NOTE: You will need to close then re-open the project for changes.
SystemSound is used to play a MessageBox sound when you are using a custom
icon. SystemSound can be MB_ICONASTERISK, MB_ICONEXCLAIMATION, MB_ICONHAND
or MB_ICONQUESTION. Setting SystemSound to 0 (zero) will cause no sound.
UseAppIcon must be set to True. IconResourceName and SystemSound will be
ignored if this parameter is False. If UseAppIcon is True, make sure the
parameter uType does NOT include a icon specifier. For example-: this is
not correct MB_OK + MB_ICONHAND. But this is fine:- MB_OK.
}
function TForm1.MessageBoxExtended(hWnd: integer; lpText: PChar; lpCaption: PChar; uType: integer; IconResourceName: PChar; SystemSound: integer; UseAppIcon: Boolean): integer;
var
MBParams: TMsgBoxParams;
begin
with MBParams do
begin
cbSize := SizeOf(MBParams);
hwndOwner := hWnd;
hInstance := SysInit.HInstance;
lpszText := lpText;
lpszCaption := lpCaption;
dwStyle := uType + MB_TOPMOST;
if UseAppIcon then
dwStyle := dwStyle or MB_USERICON;
lpszIcon := IconResourceName;
dwContextHelpId := 0;
lpfnMsgBoxCallback := nil;
dwLanguageId := LANG_NEUTRAL;
end;
if SystemSound 0 then
MessageBeep(SystemSound);
Result := integer(MessageBoxIndirect(MBParams));
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
if Self.MessageBoxExtended(Self.handle, 'This is a example of a custom icon inside of your MessageBox' + #10 + 'Try changing the App''s icon, then try adding more..' + #10 + #10 + 'Do you like it?', 'Custom Icons', MB_YESNO, 'MAINICON', MB_ICONQUESTION, True) = ID_YES then
Self.MessageBoxExtended(Self.handle, 'I''m very pleased. Enjoy it.', PChar(Application.Title), MB_OK + MB_ICONINFORMATION, '', 0, False)
else
Self.MessageBoxExtended(Self.handle, 'I''m sorry to hear that.', PChar(Application.Title), MB_OK + MB_ICONINFORMATION, '', 0, False)
end;