How can I remove the caption bar icons at run-time?

How can I remove the caption bar icons at run-time?

Applies To: C++Builder 1 or higher
Category: Knowledge Base

At design-time, I can easily change the BorderIcons property of my form to modify the caption bar icons. However, modifying this property at run-time does not change anything.

Start a new project using File | New Application.

Add a Button. Edit its OnClick event:

void __fastcall TForm1::Button1Click(TObject *Sender)

{

LONG style;

// Get the current style

style = GetWindowLong(Handle, GWL_STYLE);

// Remove the system menu

style &= ~WS_SYSMENU;

SetWindowLong(Handle, GWL_STYLE, style);

// Redraw the form

RedrawWindow(Handle, 0, 0, RDW_FRAME | RDW_UPDATENOW

| RDW_INVALIDATE);

}

The SetWindowLong Win32 API function helps you change the behavior of your form.

Hints

· To show the system menu, set the style to style |= WS_SYSMENU;

· You can also remove/show individually the minimize and maximize boxes by using WS_MINIMIZEBOX and WS_MAXIMIZEBOX.