form上有几个image,image里都放着图片,把这几张图片按照它在form上的排列和大小打印出来,我用printer.Canvas.StretchDraw打印出的图象很小,看资料说要用GetDeviceCaps 取得打印机的分辨率,我想问一下,我看了函数GetDeviceCaps的帮助,不是太明白,他的返回值是不是每英寸的像素点值。如果是,比如说image在form中的位置为(left:=80,top:=100,width:=200,height:=300),那么下面的代码中r1应该为什么呢?也就是说取得打印机的分辨率后怎么转化为r1所需要的值?另外上面的80,100,200,300它的单位是多少?
var
r1,:TRect;
x,y:integer;
begin
x:=GetDeviceCaps(printer.Handle, logPixelsX);
y:=GetDeviceCaps(printer.Handle, logPixelsY);
r1:=Rect(?)
printer.BeginDoc;
printer.Canvas.StretchDraw(r1,image.Picture.Graphic);
printer.EndDoc;
end;
var
r1,:TRect;
x,y:integer;
begin
x:=GetDeviceCaps(printer.Handle, logPixelsX);
y:=GetDeviceCaps(printer.Handle, logPixelsY);
r1:=Rect(?)
printer.BeginDoc;
printer.Canvas.StretchDraw(r1,image.Picture.Graphic);
printer.EndDoc;
end;
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Form1: TForm1;
ppix, ppiy: Integer;implementation
{$R *.dfm}procedure Getppi(DC: HDC);
begin
ppix:=GetDeviceCaps(DC,logPixelsX);
ppiy:=GetDeviceCaps(DC,logPixelsY);
end;
function CmToPixelX(cm: Real): Integer;
begin
Result := Trunc(Cm * ppix / 2.54);
end;function CmToPixelY(cm: Real): integer;
begin
Result := Trunc(Cm * ppiy /2.54);
end;//前面定义一个过程和两个函数,那样就不会因打印机的分辩率而失效:)
procedure TForm1.BitBtn1Click(Sender: TObject);
begin
getppi(printer.handle);
x:=CmToPixelX(2.5); //距水平页边距 2.5cm
y:=cmtopixely(2.7); //距垂直页边距 2.7cm
printer.BeginDoc;
printer.canvas.draw(x,y,image1.picture.graphic);
Printer.endDoc;
end;
例:通过调整Rect的范围、图形大小及其在打印页面上的位置,实现图形打印:procedure TForm1.Button1Click(Sender: TObject);var strect:Trect; //定义打印输出矩形框的大小temhitemwd:integer;beginif printdialog1.execute thenbegintemhi:=image1.picture.height;temwd:=image1.picture.width;while (temhi<printer.pageheight div 2) and //将图形放大到打印页面的1/2 (temwd<printer.pagewidth div 2) do begintemhi:=temhi+temhi;temwd:=temwd+temwd;end;with strect do //定义图形在页面上的中心位置输出beginleft:=(printer.pagewidth -temwd) div 2;top:=(printer.pageheight-temhi) div 2;right:=left+temwd;bottom:=top+temhi;end;with Printer do beginbegindoc; //将放大的图形向打印机输出canvas.stretchdraw(strectimage1.picture.graphic);enddoc;end;end;end;
PPalEntriesArray = ^TPalEntriesArray; {for palette re-construction}
TPalEntriesArray = array[0..0] of TPaletteEntry;procedure BltTBitmapAsDib(DestDc : hdc; {Handle of where to blt}
x : word; {Bit at x}
y : word; {Blt at y}
Width : word; {Width to stretch}
Height : word; {Height to stretch}
bm : TBitmap); {the TBitmap to Blt}
var
OriginalWidth :LongInt; {width of BM}
dc : hdc; {screen dc}
IsPaletteDevice : bool; {if the device uses palettes}
IsDestPaletteDevice : bool; {if the device uses palettes}
BitmapInfoSize : integer; {sizeof the bitmapinfoheader}
lpBitmapInfo : PBitmapInfo; {the bitmap info header}
hBm : hBitmap; {handle to the bitmap}
hPal : hPalette; {handle to the palette}
OldPal : hPalette; {temp palette}
hBits : THandle; {handle to the DIB bits}
pBits : pointer; {pointer to the DIB bits}
lPPalEntriesArray : PPalEntriesArray; {palette entry array}
NumPalEntries : integer; {number of palette entries}
i : integer; {looping variable}
begin
{If range checking is on - lets turn it off for now}
{we will remember if range checking was on by defining}
{a define called CKRANGE if range checking is on.}
{We do this to access array members past the arrays}
{defined index range without causing a range check}
{error at runtime. To satisfy the compiler, we must}
{also access the indexes with a variable. ie: if we}
{have an array defined as a: array[0..0] of byte,}
{and an integer i, we can now access a[3] by setting}
{i := 3; and then accessing a[i] without error}
{$IFOPT R+}
{$DEFINE CKRANGE}
{$R-}
{$ENDIF} {Save the original width of the bitmap}
OriginalWidth := bm.Width; {Get the screen's dc to use since memory dc's are not reliable}
dc := GetDc(0);
{Are we a palette device?}
IsPaletteDevice :=
GetDeviceCaps(dc, RASTERCAPS) and RC_PALETTE = RC_PALETTE;
{Give back the screen dc}
dc := ReleaseDc(0, dc); {Allocate the BitmapInfo structure}
if IsPaletteDevice then
BitmapInfoSize := sizeof(TBitmapInfo) + (sizeof(TRGBQUAD) * 255)
else
BitmapInfoSize := sizeof(TBitmapInfo);
GetMem(lpBitmapInfo, BitmapInfoSize); {Zero out the BitmapInfo structure}
FillChar(lpBitmapInfo^, BitmapInfoSize, #0); {Fill in the BitmapInfo structure}
lpBitmapInfo^.bmiHeader.biSize := sizeof(TBitmapInfoHeader);
lpBitmapInfo^.bmiHeader.biWidth := OriginalWidth;
lpBitmapInfo^.bmiHeader.biHeight := bm.Height;
lpBitmapInfo^.bmiHeader.biPlanes := 1;
if IsPaletteDevice then
lpBitmapInfo^.bmiHeader.biBitCount := 8
else
lpBitmapInfo^.bmiHeader.biBitCount := 24;
lpBitmapInfo^.bmiHeader.biCompression := BI_RGB;
lpBitmapInfo^.bmiHeader.biSizeImage :=
((lpBitmapInfo^.bmiHeader.biWidth *
longint(lpBitmapInfo^.bmiHeader.biBitCount)) div 8) *
lpBitmapInfo^.bmiHeader.biHeight;
lpBitmapInfo^.bmiHeader.biXPelsPerMeter := 0;
lpBitmapInfo^.bmiHeader.biYPelsPerMeter := 0;
if IsPaletteDevice then begin
lpBitmapInfo^.bmiHeader.biClrUsed := 256;
lpBitmapInfo^.bmiHeader.biClrImportant := 256;
end else begin
lpBitmapInfo^.bmiHeader.biClrUsed := 0;
lpBitmapInfo^.bmiHeader.biClrImportant := 0;
end; {Take ownership of the bitmap handle and palette}
hBm := bm.ReleaseHandle;
hPal := bm.ReleasePalette; {Get the screen's dc to use since memory dc's are not reliable}
dc := GetDc(0); if IsPaletteDevice then begin
{If we are using a palette, it must be}
{selected into the dc during the conversion}
OldPal := SelectPalette(dc, hPal, TRUE);
{Realize the palette}
RealizePalette(dc);
end;
{Tell GetDiBits to fill in the rest of the bitmap info structure}
GetDiBits(dc,
hBm,
0,
lpBitmapInfo^.bmiHeader.biHeight,
nil,
TBitmapInfo(lpBitmapInfo^),
DIB_RGB_COLORS); {Allocate memory for the Bits}
hBits := GlobalAlloc(GMEM_MOVEABLE,
lpBitmapInfo^.bmiHeader.biSizeImage);
pBits := GlobalLock(hBits);
{Get the bits}
GetDiBits(dc,
hBm,
0,
lpBitmapInfo^.bmiHeader.biHeight,
pBits,
TBitmapInfo(lpBitmapInfo^),
DIB_RGB_COLORS);
if IsPaletteDevice then begin
{Lets fix up the color table for buggy video drivers}
GetMem(lPPalEntriesArray, sizeof(TPaletteEntry) * 256);
{$IFDEF VER100}
NumPalEntries := GetPaletteEntries(hPal,
0,
256,
lPPalEntriesArray^);
{$ELSE}
NumPalEntries := GetSystemPaletteEntries(dc,
0,
256,
lPPalEntriesArray^);
{$ENDIF}
for i := 0 to (NumPalEntries - 1) do begin
lpBitmapInfo^.bmiColors[i].rgbRed :=
lPPalEntriesArray^[i].peRed;
lpBitmapInfo^.bmiColors[i].rgbGreen :=
lPPalEntriesArray^[i].peGreen;
lpBitmapInfo^.bmiColors[i].rgbBlue :=
lPPalEntriesArray^[i].peBlue;
end;
FreeMem(lPPalEntriesArray, sizeof(TPaletteEntry) * 256);
end; if IsPaletteDevice then begin
{Select the old palette back in}
SelectPalette(dc, OldPal, TRUE);
{Realize the old palette}
RealizePalette(dc);
end; {Give back the screen dc}
dc := ReleaseDc(0, dc); {Is the Dest dc a palette device?}
IsDestPaletteDevice :=
GetDeviceCaps(DestDc, RASTERCAPS) and RC_PALETTE = RC_PALETTE;
if IsPaletteDevice then begin
{If we are using a palette, it must be}
{selected into the dc during the conversion}
OldPal := SelectPalette(DestDc, hPal, TRUE);
{Realize the palette}
RealizePalette(DestDc);
end; {Do the blt}
StretchDiBits(DestDc,
x,
y,
Width,
Height,
0,
0,
OriginalWidth,
lpBitmapInfo^.bmiHeader.biHeight,
pBits,
lpBitmapInfo^,
DIB_RGB_COLORS,
SrcCopy); if IsDestPaletteDevice then begin
{Select the old palette back in}
SelectPalette(DestDc, OldPal, TRUE);
{Realize the old palette}
RealizePalette(DestDc);
end; {De-Allocate the Dib Bits}
GlobalUnLock(hBits);
GlobalFree(hBits); {De-Allocate the BitmapInfo}
FreeMem(lpBitmapInfo, BitmapInfoSize); {Set the ownership of the bimap handles back to the bitmap}
bm.Handle := hBm;
bm.Palette := hPal; {Turn range checking back on if it was on when we started}
{$IFDEF CKRANGE}
{$UNDEF CKRANGE}
{$R+}
{$ENDIF}
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
if PrintDialog1.Execute then begin
Printer.BeginDoc;
BltTBitmapAsDib(Printer.Canvas.Handle,
0,
0,
Image1.Picture.Bitmap.Width,
Image1.Picture.Bitmap.Height,
Image1.Picture.Bitmap);
Printer.EndDoc;
end;
end;
你好,谢谢你的代码,你的第一个例子中[距水平页边距 2.5cm]我想知道指的是距打印纸页边距 2.5cm吧,我需要的是根据image在form上的位置打印,这个时候x:=CmToPixelX(2.5)中括号内应为何值呢?这也是我问80,100,200,300它的单位是多少的原因?另外我试过Trunc(Cm * ppix / 2.54),就是不知道cm应该代入的值为多少。用上面的left:=80,top:=100打出来图更小。
顶部算起500个点的地方打印edit1.text内容。这里的点含义就是打印机分辨率DPI
中的每英寸多少点的这个点。比如600DPI的分辨率就表示一英寸有600个点,那么上
面那个打印命令就是在坐标为(1/6英寸,5/6英寸)的地方打印了edit1.text的内容。
比如说image在form中的位置是left100,top500,那么打在打印纸上应该不是从左边算起100个点,顶部算起500个点的地方吧?它们之间应该如何转换呢?谢谢。
To:ghbh(我想编但是编不出来)你好! 我看了你的短信。
我在另外那个近似的帖子的回复中,所说的那种方法,简单
但不是很精确。但是,要以什么样的方式输出图片到打印机中,
其实取决于你“想要做什么和你的要求”。我个人强烈向你推荐很好的两部书:
出版社:人民邮电出版社
作者:Steve Teixeira Xavier Pacheco
(是写Delphi的作者之一,很牛哦,我们能有饭吃是靠他们哦)
书名:Delphi 4 开发大全(上、下两部)(我不知英文名)
哪里有卖,我就不知了,深圳这边大大小小的书店都没有,
估计象广州、北京、上海等地才有。说这部书绝对经典,
已经不是我一个说过了,真的值得拥有。大家努力!
你好! 你是广东阳江的吧,其实我的要求不复杂:form上有几张图片,这几张图片紧挨着,把form上的几张图片按照它在form上的位置和大小打印出来,打在纸上哪个地方无所谓,只要图片还是基本紧挨着并且大小差不多就行。请问我应该用什么办法呢?