我在这段代码有一个范围检查错误:范围检查错误画布
{ This procedure is copied from RxLibrary VCLUtils }
procedure CopyParentImage(Control: TControl; Dest: TCanvas);
var
I, Count, X, Y, SaveIndex: Integer;
DC: HDC;
R, SelfR, CtlR: TRect;
begin
if (Control = nil) OR (Control.Parent = nil)
then Exit;
Count := Control.Parent.ControlCount;
DC := Dest.Handle;
with Control.Parent
DO ControlState := ControlState + [csPaintCopy];
TRY
with Control do
begin
SelfR := Bounds(Left, Top, Width, Height);
X := -Left; Y := -Top;
end;
{ Copy parent control image }
SaveIndex := SaveDC(DC);
TRY
SetViewportOrgEx(DC, X, Y, nil);
IntersectClipRect(DC, 0, 0, Control.Parent.ClientWidth, Control.Parent.ClientHeight);
with TParentControl(Control.Parent) DO
begin
{$R-}
Perform(WM_ERASEBKGND, DC, 0); <--------------- HERE
{$R+}
PaintWindow(DC);
end;
FINALLY
RestoreDC(DC, SaveIndex);
END;
{ Copy images of graphic controls }
for I := 0 to Count - 1 do begin
if Control.Parent.Controls[I] = Control then Break
else if (Control.Parent.Controls[I] <> nil) and
(Control.Parent.Controls[I] is TGraphicControl) then
begin
with TGraphicControl(Control.Parent.Controls[I]) do begin
CtlR := Bounds(Left, Top, Width, Height);
if Bool(IntersectRect(R, SelfR, CtlR)) and Visible then
begin
ControlState := ControlState + [csPaintCopy];
SaveIndex := SaveDC(DC);
try
SetViewportOrgEx(DC, Left + X, Top + Y, nil);
IntersectClipRect(DC, 0, 0, Width, Height);
{$R-}
Perform(WM_PAINT, DC, 0); <--------------- HERE
{$R+}
finally
RestoreDC(DC, SaveIndex);
ControlState := ControlState - [csPaintCopy];
end;
end;
end;
end;
end;
FINALLY
with Control.Parent DO
ControlState := ControlState - [csPaintCopy];
end;
end;
有人发布的代码,而无需范围检查激活:(
我把{$ R - } {$ R +}周围已产生的差错,现在的代码工作,但我不知道有什么后果的线路,我不希望一些奇怪的错误后
德尔福,赢。 7 32bit
非常感谢。有效。我已经看到参数之间的差异,但我不知道我可以使用WParam进行类型转换。它看起来像在Delphi 3中出现的变化,但代码是用于Delphi 2005,我最初认为是代码错误。可能开发人员关闭了“范围检查”选项。 – Ampere 2010-11-02 13:06:34