Delphi中如何控制打印方向，纸张大小等

如何在程序里控制打印纸张大小（A3，A4）和打印方向？不想打开设置窗口
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Uses Printer;
.........
procedure TForm1.Button1Click(Sender: TObject);
var
ADevice, ADriver, APort: array[0..255] of Char;
DeviceHandle: THandle;
DevMode: PDeviceMode;
begin
//初始化打印机
Printer.GetPrinter(ADevice, ADriver, APort, DeviceHandle);
if DeviceHandle = 0 then
begin
Printer.PrinterIndex := Printer.PrinterIndex;
Printer.GetPrinter(ADevice, ADriver, APort, DeviceHandle);
end;
if DeviceHandle = 0 then
Raise Exception.Create('不能初始化打印机！')
else
DevMode := GlobalLock(DeviceHandle);
if DeviceHandle <> 0 then
begin
with DevMode^ do
begin
dmFields := dmFields or DM_ORIENTATION;
//在下面这里设置打印方向
dmOrientation := DMORIENT_LANDSCAPE; //DMORIENT_PORTRAIT
dmPaperSize := DMPAPER_A3;
Printer.SetPrinter(ADevice, ADriver, APort, DeviceHandle);
GlobalUnLock(DeviceHandle);
end;
end;

PrinterSetupDialog1.Execute; //验证一下设置是否成功了
end;


*************
printer.pagewidth是只读属性
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参考这个

var

hDMode: THandle;
PDMode: PDEVMODE;
Printer.GetPrinter(Device, Driver, Port, hDMode);

if hDMode <> 0 then
begin
pDMode := GlobalLock(hDMode);
if pDMode <> nil then
begin
pDMode^.dmFields := DM_PAPERSIZE or DM_PAPERWIDTH or DM_PAPERLENGTH;
pDMode^.dmPaperSize := DMPAPER_USER;
pDMode^.dmPaperWidth := APaperWidth;
pDMode^.dmPaperLength := APaperHeight;

pDMode^.dmFields:=pDMode^.dmFields or DM_ORIENTATION;
pDMode^.DMORIENTATION:= Direct;
end;
end;
//打印机设置的纸张大小
---------------------------------------------------------------

在执行打印前调用以下函数：
procedure SetPaperSize(X, Y: Integer);
// 单位是0.1mm
// A4时 Printer.Pagewidth:=1440； A5时 Printer.Pagewidth:=1049；
// B5时 Printer.Pagewidth:=1290； 16K时 Printer.Pagewidth:=1035；
// lq1600宽行打印机这个值宽度最大为42cm左右, 长度大约2m。
//改变devicemode结构
var
Device: array[0..255] of char;
Driver: array[0..255] of char;
Port: array[0..255] of char;
hDMode: THandle;
PDMode: PDEVMODE;
begin
Printer.PrinterIndex := Printer.PrinterIndex;
Printer.GetPrinter(Device, Driver, Port, hDMode);
if hDMode <> 0 then
begin
pDMode := GlobalLock(hDMode);
if pDMode <> nil then
begin
if (x = 0) or (y = 0) then
begin
{Set to legal}
pDMode^.dmFields := pDMode^.dmFields or dm_PaperSize;
{pDMode^.dmPaperSize := DMPAPER_LEGAL; changed by wulianmin}
pDMode^.dmPaperSize := DMPAPER_FANFOLD_US;
end
else
begin
{Set to custom size}
pDMode^.dmFields := pDMode^.dmFields or
DM_PAPERSIZE or
DM_PAPERWIDTH or
DM_PAPERLENGTH;
pDMode^.dmPaperSize := DMPAPER_USER;
pDMode^.dmPaperWidth := x {SomeValueInTenthsOfAMillimeter};
pDMode^.dmPaperLength := y {SomeValueInTenthsOfAMillimeter};
end;
{设定纸张来源}
pDMode^.dmFields := pDMode^.dmFields or DMBIN_MANUAL;
pDMode^.dmDefaultSource := DMBIN_MANUAL;

GlobalUnlock(hDMode);
end;
end;
Printer.PrinterIndex := Printer.PrinterIndex;
//以下开始打印
Printer.BeginDoc;
Printer.Canvas.TextOut(100,100, 'Test 1');
Printer.EndDoc;
end;