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function GetDeviceName():String;
var MyReg: TRegistry;
szDeviceName: String;
begin
try
MyReg := TRegistry.Create;
MyReg.RootKey := HKEY_CURRENT_CONFIG;
if MyReg.OpenKey('\System\CurrentControlSet\Control\Print\Printers',False) then
szDeviceName:=MyReg.ReadString('Default')
else
szDeviceName:='';
Except
MyReg.Free;
end;
result:=szDeviceName;
end;
function GetPortName(): String;
var MyReg: TRegistry;
szPortName: String;
begin
try
MyReg := TRegistry.Create;
MyReg.RootKey := HKEY_LOCAL_MACHINE;
if MyReg.OpenKey('\System\CurrentControlSet\Control\Print\Printers\'+GetDeviceName(),False) then
szPortName:=MyReg.ReadString('Port')
else
szPortName:='';
Except
MyReg.Free;
end;
result:=szPortName;
end;
function SetPaperSize(var nWidth,nHeight,nOrient:Word;var nHandle: THandle):integer; export;
var
szPrinterKey: array[0..99] of Char;
szDeviceName: String;
szPort: String;
cbBuffer: DWORD;
dwRV: DWORD;
dwPapers: DWord;
lpwPapers: array[0..255] of Word;
fSupportUserDefind: Boolean;
fSupportA3: Boolean;
fSupportA4: Boolean;
fSupportB5: Boolean;
hDriver: THandle;
hMem: HGLOBAL;
lpDevMode: Pdevicemode;
a1: Pdevicemode;
i: integer;
begin
fSupportUserDefind:=FALSE;
fSupportA3:=FALSE;
fSupportA4:=FALSE;
fSupportB5:=FALSE;
//取当前默认打印机设备名
szDeviceName:=GetDeviceName();
if szDeviceName='' then
result:=-1;
//取打印机端口
szPort:=GetPortName();
if szPort='' then
result:=-2;
//取打印机支持的全部纸型
dwPapers:=DeviceCapabilities(PChar(szDeviceName),PChar(szPort),DC_PAPERS,@lpwPapers,nil);
if (dwPapers<1)or(dwPapers>256) then
result:=-3;
//判断打印机是否支持自定义、A3、A4、B5纸型
while (dwPapers > 0) do
begin
case DWORD(lpwPapers[dwPapers]) of
DMPAPER_USER: fSupportUserDefind:=TRUE;
DMPAPER_A3: fSupportA3:=TRUE;
DMPAPER_A4: fSupportA4:=TRUE;
DMPAPER_B5: fSupportB5:=TRUE;
end;
dwPapers:=dwPapers-1;
end;
//取打印机的DeviceMode
a1:=nil;
if not(OpenPrinter(PChar(szDeviceName),hDriver,nil)) then result:=-4;
hMem:=GlobalAlloc(GPTR,DocumentPropertiesA(nHandle,hDriver,PChar(szDeviceName),a1^,a1^,0));
lpDevMode:=GlobalLock(hMem);
a1:=nil;
DocumentProperties(nHandle,hDriver,PChar(szDeviceName),lpDevMode^,a1^,DM_OUT_BUFFER);
//设置纸型或大小
i:=0;
if ((nWidth=2970)and(nHeight=4200))and(fSupportA3) then i:=1;
if ((nWidth=2100)and(nHeight=2970))and(fSupportA4) then i:=i+2;
if ((nWidth=1820)and(nHeight=2570))and(fSupportB5) then i:=i+3;
case i of
1: begin //A3
lpDevMode.dmFields:=DM_PAPERSIZE;
lpDevMode.dmPaperSize:=DMPAPER_A3;
end;
2: begin //A4
lpDevMode.dmFields:=DM_PAPERSIZE;
lpDevMode.dmPaperSize:=DMPAPER_A4;
end;
3: begin //B5
lpDevMode.dmFields:=DM_PAPERSIZE;
lpDevMode.dmPaperSize:=DMPAPER_B5;
end;
else
if fSupportUserDefind then
begin
lpDevMode.dmFields:=DM_PAPERSIZE or DM_PAPERWIDTH or DM_PAPERLENGTH;
lpDevMode.dmPaperSize:=DMPAPER_USER;
lpDevMode.dmPaperWidth:=nWidth;
lpDevMode.dmPaperLength:=nHeight;
end
else
lpDevMode.dmFields:=0;
end;
//设置方向
case nOrient of
0: begin
lpDevMode.dmFields:=lpDevMode.dmFields or DM_ORIENTATION;
lpDevMode.dmOrientation:=DMORIENT_PORTRAIT;
end;
1: begin
lpDevMode.dmFields:=lpDevMode.dmFields or DM_ORIENTATION;
lpDevMode.dmOrientation:=DMORIENT_LANDSCAPE;
end;
end;
a1:=nil;
DocumentProperties(nHandle,hDriver,PChar(szDeviceName),a1^,lpDevMode^,DM_IN_BUFFER or DM_UPDATE);
GlobalUnlock(hMem);
GlobalFree(hMem);
ClosePrinter(hDriver);
result:=1;
end;
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