Newsgroup: it.comp.programmare.win32
Titolo: Cambiare il puntatore a Windows

Come posso cambiare il puntatore predefonito di Windows (la freccina) sin
dall' avvio?
Grazie!

dall' avvio?
Devi usare SetClassLong() con il parametro GCL_HCURSOR	.
The SetClassLong function replaces the specified 32-bit (long) value
at the specified offset into the extra class memory or the WNDCLASS
structure for the class to which the specified window belongs. 
DWORD SetClassLong(
    HWND hWnd,	// handle of window
    int nIndex,	// index of value to change
    LONG dwNewLong 	// new value
   );	
 
Parameters
hWnd
Identifies the window and, indirectly, the class to which the window
belongs. 
nIndex
Specifies the 32-bit value to replace. To set a 32-bit value in the
extra class memory, specify the positive, zero-based byte offset of
the value to be set. Valid values are in the range zero through the
number of bytes of extra class memory, minus four; for example, if you
specified 12 or more bytes of extra class memory, a value of 8 would
be an index to the third 32-bit integer. To set any other value from
the WNDCLASS structure, specify one of the following values: 
Value	Action
GCL_CBCLSEXTRA	Sets the size, in bytes, of the extra memory
associated with the class. Setting this value does not change the
number of extra bytes already allocated.
GCL_CBWNDEXTRA	Sets the size, in bytes, of the extra window memory
associated with each window in the class. Setting this value does not
change the number of extra bytes already allocated. For information on
how to access this memory, see SetWindowLong and SetWindowWord.
GCL_HBRBACKGROUND	Replaces the handle of the background brush
associated with the class.
GCL_HCURSOR	Replaces the handle of the cursor associated with the
class.
GCL_HICON	Replaces the handle of the icon associated with the
class.
GCL_HMODULE	Replaces the handle of the module that registered the
class.
GCL_MENUNAME	Replaces the address of the menu name string. The
string identifies the menu resource associated with the class.
GCL_STYLE	Replaces the window-class style bits.
GCL_WNDPROC	Replaces the address of the window procedure
associated with the class.
 
dwNewLong
Specifies the replacement value. 
 
Return Values
If the function succeeds, the return value is the previous value of
the specified 32-bit integer.
If the function fails, the return value is zero. To get extended error
information, call GetLastError. 
Remarks
If you use the SetClassLong function and the GCL_WNDPROC index to
replace the window procedure, the window procedure must conform to the
guidelines specified in the description of the WindowProc callback
function. 
Calling SetClassLong with the GCL_WNDPROC index creates a subclass of
the window class that affects all windows subsequently created with
the class. An application should not subclass a window created by
another process. 
Reserve extra class memory by specifying a nonzero value in the
cbClsExtra member of the WNDCLASS structure used with the
RegisterClass function. 
Use the SetClassLong function with care. For example, it is possible
to change the background color for a class by using SetClassLong, but
this change does not immediately repaint all windows belonging to the
class.