我想把edit中的内容打印出来。大致意思是这样子:先获得打印机的横向和纵线的
function TestPrint.HPointsPerInch: Integer;
var temp:integer;
begin
Result := GetDeviceCaps(Printer.Handle, LOGPIXELSX);end;
function TestPrint.VPointsPerInch: Integer;
var temp:integer;
begin
Result := GetDeviceCaps(Printer.Handle, LOGPIXELSY);end;
function TestPrint.PrintText(Xmm, Ymm: Extended; Txt: string;
FontS:TFont;):Integer;
var
Px, Py: Integer;
begin
Result:=1;
Px:=Trunc(Xmm*HPointsPerInch/25.4);
Py:=Trunc(Ymm * VPointsPerInch/25.4);
Px := Px + 2 * AvgCharWidth;
Printer.Canvas.Font:=FontS;
if not Printer.Aborted then
Printer.Canvas.TextOut(Px, Py, Txt);
end;打印机的设置都是默认得。现在打印的时候问题出来了。如果我在函数里调用
printer.BeginDoc;
PrintText(2,3,'1234',edit1.font);
printer.EndDoc;
这时候还能正常打印,内容能够在纸张上显示出来
如果换成是:
printer.BeginDoc;
PrintText(277,75,'1234',edit1.font);
printer.EndDoc;
这时候就显示不出来了,我追踪了一下Py和Px已经变成好几千了。
这个问题郁闷了好几天了。不知道是怎么回事。只是说为了适应不同的打印机,所以才要进行打印换算。但是不明白其中的道理。
function TestPrint.HPointsPerInch: Integer;
var temp:integer;
begin
Result := GetDeviceCaps(Printer.Handle, LOGPIXELSX);end;
function TestPrint.VPointsPerInch: Integer;
var temp:integer;
begin
Result := GetDeviceCaps(Printer.Handle, LOGPIXELSY);end;
function TestPrint.PrintText(Xmm, Ymm: Extended; Txt: string;
FontS:TFont;):Integer;
var
Px, Py: Integer;
begin
Result:=1;
Px:=Trunc(Xmm*HPointsPerInch/25.4);
Py:=Trunc(Ymm * VPointsPerInch/25.4);
Px := Px + 2 * AvgCharWidth;
Printer.Canvas.Font:=FontS;
if not Printer.Aborted then
Printer.Canvas.TextOut(Px, Py, Txt);
end;打印机的设置都是默认得。现在打印的时候问题出来了。如果我在函数里调用
printer.BeginDoc;
PrintText(2,3,'1234',edit1.font);
printer.EndDoc;
这时候还能正常打印,内容能够在纸张上显示出来
如果换成是:
printer.BeginDoc;
PrintText(277,75,'1234',edit1.font);
printer.EndDoc;
这时候就显示不出来了,我追踪了一下Py和Px已经变成好几千了。
这个问题郁闷了好几天了。不知道是怎么回事。只是说为了适应不同的打印机,所以才要进行打印换算。但是不明白其中的道理。
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printer.BeginDoc;
PrintText(2,3,'1234',edit1.font);
printer.EndDoc;
與
printer.BeginDoc;
PrintText(277,75,'1234',edit1.font);
printer.EndDoc;LZ不妨從這裡考慮呢,用API的DevMode。。unit MainFrm; interface uses
SysUtils, Windows, Messages, Classes, Graphics, Controls,
Forms, Dialogs, printers, StdCtrls, ExtCtrls, Menus, ComCtrls; type TEnvelope = record
Kind: string; // Stores the envelope type 's name
Width: double; // Holds the width of the envelope
Height: double; // Holds the height of the envelope
end; const
// This constant array stores envelope types
EnvArray: array[1..2] of TEnvelope =
((Kind: 'Size 10 ';Width:9.5;Height:4.125), // 9-1/2 x 4-1/8
(Kind: 'Size 6-3/4 ';Width:6.5;Height:3.625)); // 6-1/2 x 3-3/4 type // This enumerated type represents printing positions.
TFeedType = (epLHorz, epLVert, epRHorz, epRVert); TPrintPrevPanel = class(TPanel)
public
property Canvas; // Publicize the Canvas property
end; TMainForm = class(TForm)
gbEnvelopeSize: TGroupBox;
rbSize10: TRadioButton;
rbSize6: TRadioButton;
mmMain: TMainMenu;
mmiPrintIt: TMenuItem;
lblAdressee: TLabel;
edtName: TEdit;
edtStreet: TEdit;
edtCityState: TEdit;
rgFeedType: TRadioGroup;
PrintDialog: TPrintDialog;
procedure FormCreate(Sender: TObject);
procedure rgFeedTypeClick(Sender: TObject);
procedure mmiPrintItClick(Sender: TObject);
private
PrintPrev: TPrintPrevPanel; // Print preview panel
EnvSize: TPoint; // Stores the envelope 's size
EnvPos: TRect; // Stores the envelope 's position
ToAddrPos: TRect; // Stores the address 's position
FeedType: TFeedType; // Stores the feed type from TEnvPosition
function GetEnvelopeSize: TPoint;
function GetEnvelopePos: TRect;
function GetToAddrSize: TPoint;
function GetToAddrPos: TRect;
procedure DrawIt;
procedure RotatePrintFont;
procedure SetCopies(Copies: Integer);
end; var
MainForm: TMainForm; implementation
{$R *.DFM} function TMainForm.GetEnvelopeSize: TPoint;
// Gets the envelope 's size represented by a TPoint
var
EnvW, EnvH: integer;
PixPerInX,
PixPerInY: integer;
begin
// Pixels per inch along the horizontal axis
PixPerInX := GetDeviceCaps(Printer.Handle, LOGPIXELSX);
// Pixels per inch along the vertical axis
PixPerInY := GetDeviceCaps(Printer.Handle, LOGPIXELSY); // Envelope size differs depending on the user 's selection
if RBSize10.Checked then
begin
EnvW := trunc(EnvArray[1].Width * PixPerInX);
EnvH := trunc(EnvArray[1].Height * PixPerInY);
end
else begin
EnvW := trunc(EnvArray[2].Width * PixPerInX);
EnvH := trunc(EnvArray[2].Height * PixPerInY);
end; // return Result as a TPoint record
Result := Point(EnvW, EnvH)
end; function TMainForm.GetEnvelopePos: TRect;
{ Returns the envelope 's position relative to its feed type. This
function requires that the variable EnvSize be initialized }
begin
// Determine feed type based on user 's selection.
FeedType := TFeedType(rgFeedType.ItemIndex); { Return a TRect structure indicating the envelope 's
position as it is ejected from the printer. }
case FeedType of
epLHorz:
Result := Rect(0, 0, EnvSize.X, EnvSize.Y);
epLVert:
Result := Rect(0, 0, EnvSize.Y, EnvSize.X);
epRHorz:
Result := Rect(Printer.PageWidth - EnvSize.X, 0, Printer.PageWidth, EnvSize.Y);
epRVert:
Result := Rect(Printer.PageWidth - EnvSize.Y, 0, Printer.PageWidth, EnvSize.X);
end; // Case
end; function MaxLn(V1, V2: Integer): Integer;
// Returns the larger of the two. If equal, returns the first
begin
Result := V1; // Default result to V1 }
if V1 < V2 then
Result := V2
end;
var
TempPoint: TPoint;
begin
// Calculate the size of the longest line using the MaxLn() function
TempPoint.x := Printer.Canvas.TextWidth(edtName.Text);
TempPoint.x := MaxLn(TempPoint.x, Printer.Canvas.TextWidth(edtStreet.Text));
TempPoint.x := MaxLn(TempPoint.x, Printer.Canvas.TextWidth(edtCityState.Text))+10;
// Calculate the height of all the address lines
TempPoint.y := Printer.Canvas.TextHeight(edtName.Text)+
Printer.Canvas.TextHeight(edtStreet.Text)+
Printer.Canvas.TextHeight(edtCityState.Text)+10;
Result := TempPoint;
end; function TMainForm.GetToAddrPos: TRect;
// This function requires that EnvSize, and EnvPos be initialized
Var
TempSize: TPoint;
LT, RB: TPoint;
begin
// Determine the size of the Address bounding rectangle
TempSize := GetToAddrSize;
{ Calculate two points, one representing the Left Top (LT) position
and one representing the Right Bottom (RB) position of the
address 's bounding rectangle. This depends on the FeedType }
case FeedType of
epLHorz:
begin
LT := Point((EnvSize.x div 2) - (TempSize.x div 2),
((EnvSize.y div 2) - (TempSize.y div 2)));
RB := Point(LT.x + TempSize.x, LT.y + TempSize.Y);
end;
epLVert:
begin
LT := Point((EnvSize.y div 2) - (TempSize.y div 2),
((EnvSize.x div 2) - (TempSize.x div 2)));
RB := Point(LT.x + TempSize.y, LT.y + TempSize.x);
end;
epRHorz:
begin
LT := Point((EnvSize.x div 2) - (TempSize.x div 2) + EnvPos.Left,
((EnvSize.y div 2) - (TempSize.y div 2)));
RB := Point(LT.x + TempSize.x, LT.y + TempSize.Y);
end;
epRVert:
begin
LT := Point((EnvSize.y div 2) - (TempSize.y div 2) + EnvPos.Left,
((EnvSize.x div 2) - (TempSize.x div 2)));
RB := Point(LT.x + TempSize.y, LT.y + TempSize.x);
end;
end; // End Case Result := Rect(LT.x, LT.y, RB.x, RB.y);
end; procedure TMainForm.DrawIt;
// This procedure assumes that EnvPos and EnvSize have been initialized
begin
PrintPrev.Invalidate; // Erase contents of Panel
PrintPrev.Update;
// Set the mapping mode for the panel to MM_ISOTROPIC
SetMapMode(PrintPrev.Canvas.Handle, MM_ISOTROPIC);
// Set the TPanel 's extent to match that of the printer boundaries.
SetWindowExtEx(PrintPrev.Canvas.Handle,
Printer.PageWidth, Printer.PageHeight, nil);
// Set the viewport extent to that of the PrintPrev TPanel size.
SetViewPortExtEx(PrintPrev.Canvas.Handle,
PrintPrev.Width, PrintPrev.Height, nil);
// Set the origin to the position at 0, 0
SetViewportOrgEx(PrintPrev.Canvas.Handle, 0, 0, nil);
PrintPrev.Brush.Style := bsSolid; with EnvPos do
// Draw a rectangle to represent the envelope
PrintPrev.Canvas.Rectangle(Left, Top, Right, Bottom); with ToAddrPos, PrintPrev.Canvas do
case FeedType of
epLHorz, epRHorz:
begin
Rectangle(Left, Top, Right, Top+2);
Rectangle(Left, Top+(Bottom-Top) div 2, Right, Top+(Bottom-Top) div 2+2);
Rectangle(Left, Bottom, Right, Bottom+2);
end;
epLVert, epRVert:
begin
Rectangle(Left, Top, Left+2, Bottom);
Rectangle(Left + (Right-Left)div 2, Top, Left + (Right-Left)div 2+2, Bottom);
Rectangle(Right, Top, Right+2, Bottom);
end;
end; // case
end; procedure TMainForm.FormCreate(Sender: TObject);
var
Ratio: double;
begin
// Calculate a ratio of PageWidth to PageHeight
Ratio := Printer.PageHeight / Printer.PageWidth; // Create a new TPanel instance
with TPanel.Create(self) do
begin
SetBounds(15, 15, 203, trunc(203*Ratio));
Color := clBlack;
BevelInner := bvNone;
BevelOuter := bvNone;
Parent := self;
end; // Create a Print preview panel
PrintPrev := TPrintPrevPanel.Create(self); with PrintPrev do
begin
SetBounds(10, 10, 200, trunc(200*Ratio));
Color := clWhite;
BevelInner := bvNone;
BevelOuter := bvNone;
BorderStyle := bsSingle;
Parent := self;
end; end; procedure TMainForm.rgFeedTypeClick(Sender: TObject);
begin
EnvSize := GetEnvelopeSize;
EnvPos := GetEnvelopePos;
ToAddrPos := GetToAddrPos;
DrawIt;
end; procedure TMainForm.SetCopies(Copies: Integer);
var
ADevice, ADriver, APort: String;
ADeviceMode: THandle;
DevMode: PDeviceMode;
begin
SetLength(ADevice, 255);
SetLength(ADriver, 255);
SetLength(APort, 255); { If ADeviceMode is zero, a printer driver is not loaded. Therefore,
setting PrinterIndex forces the driver to load. }
if ADeviceMode = 0 then
begin
Printer.PrinterIndex := Printer.PrinterIndex;
Printer.GetPrinter(PChar(ADevice), PChar(ADriver), PChar(APort), ADeviceMode);
end; if ADeviceMode <> 0 then
begin
DevMode := GlobalLock(ADeviceMode);
try
DevMode^.dmFields := DevMode^.dmFields or DM_Copies;
DevMode^.dmCopies := Copies;
finally
GlobalUnlock(ADeviceMode);
end;
end
else
raise Exception.Create( 'Could not set printer copies ');
end;
var
TempHeight: integer;
SaveFont: TFont;
begin
if PrintDialog.Execute then
begin
// Set the number of copies to print
SetCopies(PrintDialog.Copies);
Printer.BeginDoc;
try
// Calculate a temporary line height
TempHeight := Printer.Canvas.TextHeight(edtName.Text);
with ToAddrPos do
begin
{ When printing vertically, rotate the font such that it paints
at a 90 degree angle. }
if (FeedType = eplVert) or (FeedType = epRVert) then
begin
SaveFont := TFont.Create;
try
// Save the original font
SaveFont.Assign(Printer.Canvas.Font);
RotatePrintFont;
// Write out the address lines to the printer 's Canvas
Printer.Canvas.TextOut(Left, Bottom, edtName.Text);
Printer.Canvas.TextOut(Left+TempHeight+2, Bottom, edtStreet.Text);
Printer.Canvas.TextOut(Left+TempHeight*2+2, Bottom, edtCityState.Text);
// Restore the original font
Printer.Canvas.Font.Assign(SaveFont);
finally
SaveFont.Free;
end;
end
else begin
{ If the envelope is not printed vertically, then
just draw the address lines normally. }
Printer.Canvas.TextOut(Left, Top, edtName.Text);
Printer.Canvas.TextOut(Left, Top+TempHeight+2, edtStreet.Text);
Printer.Canvas.TextOut(Left, Top+TempHeight*2+2, edtCityState.Text);
end;
end;
finally
Printer.EndDoc;
end;
end;
end; procedure TMainForm.RotatePrintFont;
var
LogFont: TLogFont;
begin
with Printer.Canvas do
begin
with LogFont do
begin
lfHeight := Font.Height; // Set to Printer.Canvas.font.height
lfWidth := 0; // let font mapper choose width
lfEscapement := 900; // tenths of degrees so 900 = 90 degrees
lfOrientation := lfEscapement; // Always set to value of lfEscapement
lfWeight := FW_NORMAL; // default
lfItalic := 0; // no italics
lfUnderline := 0; // no underline
lfStrikeOut := 0; // no strikeout
lfCharSet := ANSI_CHARSET; //default
StrPCopy(lfFaceName, Font.Name); // Printer.Canvas 's font 's name
lfQuality := PROOF_QUALITY;
lfOutPrecision := OUT_TT_ONLY_PRECIS; // force TrueType fonts
lfClipPrecision := CLIP_DEFAULT_PRECIS; // default
lfPitchAndFamily := Variable_Pitch; // default
end;
end;
Printer.Canvas.Font.Handle := CreateFontIndirect(LogFont);
end; end.