近日因项目需要接触了打印机，自定义纸张的大小问题困扰了我一个多星期，还以为XP系统无法自定义纸张，后来在网上搜索时无意中发现，打印机都有最小纸张的标准，如果小于或大于这个标准，就算自定义好了页面，都无法选择它（不会显示出来），如果用程序强制设置打印的话，它会按A4的标准走纸，比如我用的Epson LQ-300K+这款打印机，最小纸张是10CM*10.16CM，而我要的宽度正好小于10CM，后来我改成10CM后，就能正常打印了。使用下面第一段例子就可以搞定了！
在 WindowsNT/200 環境下要自訂紙張尺寸所使用的方法與 Win9x 不同，
你必須先為目前的印表機定義一個自訂的 "Form"（呼叫 API: AddForm，
此 API 宣告於 WinSpool 單元中），然後把這個 Form 的名稱設定給
DEVMODES 結構中的 dmFormName 欄位。以下的函式可以直接拿來使用：
uses Windows, WinSpool, Printers;
(*------------------------------------------------------
Define a new Form (WinNT/2000 only).
If FormName already exists, do nothing and return.
If failed, an exception will be raised.
------------------------------------------------------*)
procedure PrnAddForm(const FormName: string; PaperWidth, PaperLength: integer);
var
PrintDevice, PrintDriver, PrintPort : array[0..255] of Char;
hDMode : THandle;
hPrinter: THandle;
FormInfo: TFormInfo1;
PaperSize: TSize;
PaperRect: TRect;
errcode: integer;
s: string;
begin
Printer.GetPrinter(PrintDevice, PrintDriver, PrintPort, hDMode);
OpenPrinter(PrintDevice, hPrinter, nil);
if hPrinter = 0 then
raise Exception.Create('Failed to open printer!');
FormInfo.Flags := FORM_USER;
FormInfo.pName := PChar(FormName);
PaperSize.cx := PaperWidth;
PaperSize.cy := PaperLength;
PaperRect.Left := 0;
PaperRect.Top := 0;
PaperRect.Right := PaperWidth;
PaperRect.Bottom := PaperLength;
FormInfo.Size := PaperSize;
FormInfo.ImageableArea := PaperRect;
if not AddForm(hPrinter, 1, @FormInfo) then
begin
errcode := GetLastError;
if errcode <> ERROR_FILE_EXISTS then // Form name exists?
begin
case errcode of
ERROR_ACCESS_DENIED: s := 'Access is denied';
ERROR_INVALID_HANDLE: s := 'The handle is invalid';
ERROR_NOT_READY: s := 'The device is not ready';
ERROR_CALL_NOT_IMPLEMENTED:
s := 'Function "AddForm" is not supported on this system';
else
s := 'Failed to add a Form (paper) name!';
end;
raise Exception.Create(s);
end;
end;
ClosePrinter(hPrinter);
end;
(*
Set custom paper size for WinNT/2000.
Make sure FormName is supported by current printer,
You can call PrnAddForm to define a new Form.
*)
procedure PrnSetPaperSizeNT(FormName: string; PaperWidth, PaperLength: integer);
var
Device, Driver, Port: array[0..80] of Char;
DevMode: THandle;
pDevmode: PDeviceMode;
begin
// Get printer device name etc.
Printer.GetPrinter(Device, Driver, Port, DevMode);
// force reload of DEVMODE
Printer.SetPrinter(Device, Driver, Port, 0) ;
// get DEVMODE handle
Printer.GetPrinter(Device, Driver, Port, DevMode);
if DevMode <> 0 then
begin
// lock it to get pointer to DEVMODE record
pDevMode := GlobalLock( DevMode );
if pDevmode <> nil then
try
with pDevmode^ do
begin
// modify form
StrLCopy( dmFormName, PChar(FormName), CCHFORMNAME-1 );
// tell printer driver that dmFormname field contains
// data it needs to inspect.
dmPaperWidth := PaperWidth;
dmPaperLength := PaperLength;
dmFields := dmFields or DM_FORMNAME or DM_PAPERWIDTH or DM_PAPERLENGTH;
end;
finally
GlobalUnlock( Devmode ); // unlock devmode handle.
end;
end; { If }
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
PrnAddForm(
edFormName.Text,
StrToInt(edPaperWidth.Text),
StrToInt(edPaperLength.Text)
);
PrnSetPaperSizeNT(
edFormName.Text,
StrToInt(edPaperWidth.Text),
StrToInt(edPaperLength.Text)
);
Printer.BeginDoc;
Printer.Canvas.TextOut(10, 10, 'Printer test!');
Printer.EndDoc;
end;
在Delphi帮助中，AddForm定义如下：
BOOL AddForm(
HANDLE hPrinter, // handle to printer object
DWORD Level, // data-structure level
LPBYTE pForm // pointer to form info. data structure
);
下面是我在Delphi中定义的自定义函数AddPaper()：
function AddPaper(PaperName: PChar;fPaperWidth,fPaperHeigth: Double): String;
var
PrintDevice, PrintDriver, PrintPort : array[0..255] of Char;
hDMode : THandle;
hPrinter: THandle;
FormInfo: TForminfo1;
PaperSize: TSize;
PaperRect: TRect;
PaperWidth,PaperHeigth: Integer;
function Zlxs(S: String;nWs: Integer): String; //整理小数位，并转化成厘米
begin
Try
Result:=FloatToStr(StrToFloat(S));
If pos('.',Result)>0 then
Result:=Copy(Result,1,pos('.',Result)+2);
Result:=FloatToStr(StrToFloat(Result)*10000);
Except
Result:='0';
end;
end;
begin
PaperWidth:=StrToInt(Zlxs(FloatToStr(fPaperWidth),3));
Paperheigth:=StrToInt(Zlxs(FloatToStr(fPaperheigth),3));
//判断是否安装打印机，并得到默认打印机的句柄
Printer.GetPrinter(PrintDevice, PrintDriver, PrintPort, hDMode);
OpenPrinter(PrintDevice, hPrinter, nil);
if hPrinter=0 then
begin
Result:='没有安装打印机！';
Exit;
end;
//定义结构
FormInfo.Flags:=FORM_USER;
FormInfo.pName:=PChar(PaperName);
PaperSize.cx:=PaperWidth;
PaperSize.cy:=PaperHeigth;
PaperRect.Left:=0;
PaperRect.Top:=0;
PaperRect.Right:=PaperSize.cx;
PaperRect.Bottom:=PaperSize.cy;
FormInfo.Size:=PaperSize;
FormInfo.ImageableArea:=PaperRect;
AddForm(hPrinter,1,@FormInfo); //添加纸张
ClosePrinter(hPrinter);
end;
3个参数：PaperName:你给纸张命的名（操作系统中叫描述格式），fPaperWidth：纸张宽度,fPaperHeigth：纸张高度。如果没有安装打印机，返回提示信息。如果已经有同样名称的纸张，函数不起作用，建议大家最好在名称中加入“_”，因为很少有这样命名的纸张，你的程序用你的专用纸张也不为过吧（谁叫Windows不提供，而我们偏偏又要用呢）？里面还有一个函数：Zlxs，这是用来整理小数的，经过试验，加入的纸张采用的单位是厘米时宽度用10000时只有1厘米，大家输入的往往是以厘米为单位的，且带小数，所以得用一个函数来将浮点数转换成整数。当然首先还得在uses段中加入Printers,winspool引用。以上代码在D5,D6+ Win 2000中运行通过。将这个函数加入管理系统中，在打印之前调用生成专用纸张，省时又省力。
这种方法应该是处理自定义纸张问题的正解，通用性强，也不会浪费打印机的链式（牵引）走纸功能。大家可以根据各自编程工具的方法进行定义，也可以做成.dll文件，这样不支持结构的编程工具，如VFP等也能使用了。
4、其他小技巧：
在使用OKI打印机时，我们有时会想把一行比较长的数据打在一张“US Std Fanfold”纸上，但“US Std Fanfold”宽度37.78cm，象OKI5330之类的打印机宽度有限，这么宽的纸放不下啊。我们可以采用自定义的方法实现，首先定义新格式，然后将“US Std Fanfold”的宽和高反过来，命个名：“US Std Fanfold(纵向)”，然后在报表设计中使用这张纸并采用横向打印就行了。
procedure UpdatePrint(Awidth,Aheight:integer);
const CustomFormName = 'ZJ Defined';
function Win95SetForm(PDevMode: PDeviceMode): Boolean;
begin
Printer.PrinterIndex := Printer.PrinterIndex;
PDevMode.dmFields := PDevMode.dmFields or DM_PAPERSIZE;
PDevMode.dmPaperSize := 256;
PDevMode.dmFields := PDevMode.dmFields or DM_PAPERWIDTH;
PDevMode.dmPaperWidth := AWidth;
PDevMode.dmFields := PDevMode.dmFields or DM_PAPERLENGTH;
PDevMode.dmPaperLength := AHeight;
Printer.PrinterIndex := Printer.PrinterIndex;
Result := True;
end;
function WinNTSetForm(PDevMode: PDeviceMode;
Device: PChar; Port: PChar): Boolean;
var
hPrinter: THandle;
pForm: Pointer;
cbNeeded: DWORD;
cReturned: DWORD;
FormInfo1: TFormInfo1;
begin
Result := False;
if OpenPrinter(Device, hPrinter, nil) then
begin
pForm := nil;
EnumForms(hPrinter, 1, pForm, 0, cbNeeded, cReturned);
GetMem(pForm, cbNeeded); //取pForm的大小并分配内存
try
if EnumForms(hPrinter, 1, pForm, cbNeeded, cbNeeded, cReturned) then
begin
if DeleteForm(hPrinter, PChar(CustomFormName)) then
Dec(cReturned); //删除旧的Form
with FormInfo1 do
begin
Flags := 0;
pName := PChar(CustomFormName);
Size.cx := AWidth * 100;
Size.cy := AHeight * 100;
with ImageAbleArea do
begin
Left := 0;
Top := 0;
Right := Size.cx;
Bottom := Size.cy;
end;
end;
if AddForm(hPrinter, 1, @FormInfo1) then
begin
Printer.PrinterIndex := Printer.PrinterIndex;
PDevMode.dmFields := PDevMode.dmFields or DM_PAPERSIZE;
PDevMode.dmPaperSize := cReturned + 1;
Printer.PrinterIndex := Printer.PrinterIndex;
Result := True;
end;
end;
finally
FreeMem(pForm);
end;
end;
end;
var
Device, Driver, Port: array[0..127] of char;
hDevMode: THandle;
PDevMode: PDeviceMode;
begin
Printer.GetPrinter(Device, Driver, Port, hDevMode);
if hDevMode <> 0 then
begin
PDevMode := GlobalLock(hDevMode);
try
if (Win32Platform = VER_PLATFORM_WIN32s) or
(Win32Platform = VER_PLATFORM_WIN32_WINDOWS) then
Win95SetForm(PDevMode)
else if Win32Platform = VER_PLATFORM_WIN32_NT then
WinNTSetForm(PDevMode, Device, Port);
finally
GlobalUnlock(hDevMode);
end;
end
end;
将《Delphi中票据凭证的精确打印》一文中关于设置打印纸张长、宽的内容贴上来，供你参考
file://设置纸张高度-单位：mm
procedure SetPaperHeight(Value:integer);
var
Device : array[0..255] of char;
Driver : array[0..255] of char;
Port : array[0..255] of char;
hDMode : THandle;
PDMode : PDEVMODE;
begin
file://自定义纸张最小高度127mm
if Value < 127 then Value := 127;
file://自定义纸张最大高度432mm
if Value > 432 then Value := 432;
Printer.PrinterIndex := Printer.PrinterIndex;
Printer.GetPrinter(Device, Driver, Port, hDMode);
if hDMode <> 0 then
begin
pDMode := GlobalLock(hDMode);
if pDMode <> nil then
begin
pDMode^.dmFields := pDMode^.dmFields or DM_PAPERSIZE or
DM_PAPERLENGTH;
pDMode^.dmPaperSize := DMPAPER_USER;
pDMode^.dmPaperLength := Value * 10;
pDMode^.dmFields := pDMode^.dmFields or DMBIN_MANUAL;
pDMode^.dmDefaultSource := DMBIN_MANUAL;
GlobalUnlock(hDMode);
end;
end;
Printer.PrinterIndex := Printer.PrinterIndex;
end;
file://设置纸张宽度：单位--mm
Procedure SetPaperWidth(Value:integer);
var
Device : array[0..255] of char;
Driver : array[0..255] of char;
Port : array[0..255] of char;
hDMode : THandle;
PDMode : PDEVMODE;
begin
file://自定义纸张最小宽度76mm
if Value < 76 then Value := 76;
file://自定义纸张最大宽度216mm
if Value > 216 then Value := 216;
Printer.PrinterIndex := Printer.PrinterIndex;
Printer.GetPrinter(Device, Driver, Port, hDMode);
if hDMode <> 0 then
begin
pDMode := GlobalLock(hDMode);
if pDMode <> nil then
begin
pDMode^.dmFields := pDMode^.dmFields or DM_PAPERSIZE or
DM_PAPERWIDTH;
pDMode^.dmPaperSize := DMPAPER_USER;
file://将毫米单位转换为0.1mm单位
pDMode^.dmPaperWidth := Value * 10;
pDMode^.dmFields := pDMode^.dmFields or DMBIN_MANUAL;
pDMode^.dmDefaultSource := DMBIN_MANUAL;
GlobalUnlock(hDMode);
end;
end;
Printer.PrinterIndex := Printer.PrinterIndex;
end;
设定纸张大小
Procedure PrintPapersize(Width,Length:integer);
var
Device : array[0..cchDeviceName -1] of Char;
Driver : array[0..(MAX_PATH -1)] of Char;
Port : array[0..32]of Char;
hDMode : THandle;
pDMode : PDevMode;
begin
Printer.GetPrinter(Device,Driver,Port,hDMode);
if hDMode <> 0 then
begin
pDMode := GlobalLock(hDMode);
if pDMode <> nil then
begin
pDMode^.dmPaperSize := 256;
pDMode^.dmPaperLength :=Length ;
pDMode^.dmPaperWidth := Width;
pDMode^.dmFields :=pDMode^.dmFields or DM_PAPERSIZE;
pDMode^.dmFields :=pDMode^.dmFields or DM_PAPERLENGTH;
pDMode^.dmFields :=pDMode^.dmFields or DM_PAPERWIDTH;
ResetDC(Printer.Handle,pDMode^);
GlobalUnlock(hDMode);
end;
end;
end;
uses WinSpool, Printers, Windows;
function CustomAddForm (const Name:String; const Width, Height:Double; const PrinterName:String):Boolean;
var
FormInfo1: TFormInfo1;
pFormInfo: PFormInfo1;
hPrinter : THandle;
begin
Result := False;
if OpenPrinter(PChar(PrinterName),hPrinter,NIL) then
begin
with FormInfo1 do
begin
Flags := 0;
pName := PAnsiChar(Name);
Size.cx := Trunc(Width*1000);
Size.cy := Trunc(Height*1000);
ImageableArea.Left := 0;
ImageableArea.Top := 0;
ImageableArea.Bottom := Size.cy;
ImageableArea.Right := Size.cx;
end;
pFormInfo := @FormInfo1;
Result := AddForm(hPrinter,1,pFormInfo);
ClosePrinter(hPrinter);
end;
end;
有两个方法可以在win2000中设置自定义纸张：
1、手工添加
在“控制面板”、“打印机和传真”中选中一台打印机，在“文件”菜单的“服务器属性”中创建新格式即可。
2、程序动态修改
procedure SetPaperSize(X, Y: Integer);
// 单位是0.1mm
//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;
{Set the bin to use}
pDMode^.dmFields := pDMode^.dmFields or DMBIN_MANUAL;
pDMode^.dmDefaultSource := DMBIN_MANUAL;
GlobalUnlock(hDMode);
end;
end;
end;
我曾经用Delphi 5.0的Printer对象编写打印程序，在许多打印机上使用都没问题
（包括一些其他EPSON打印机），但是在EPSON 460上使用时不能打印，结果发现在这种
环境下，必须给Printer的Title属性赋值后，打印机才会真正去打印，具体方法如下：
Printer.BeginDoc;
Printer.Title := '在这里给打印文档起个名字';
{打印的内容};
Printer.EndDoc;