Frequently Asked Questions
FAQ ID: 21202
This code is based on the working code posted by Jim Livermore on UT and work of George Tasker and late Ed Rauh.
* All sizes in inches
ooo = NEWOBJECT("AddPrinterForm", "AddPrinterFormClass.fxp")
IF NOT ooo.AddForm("MyCustomForm1", 5,7, "EPSON Stylus C82 Series")
? ooo.cErrorMessage
? ooo.cApiErrorMessage
* Error
ENDIF
ooo = Null
*RETURN
* All sizes in cm
ooo = NEWOBJECT("AddPrinterForm", "AddPrinterFormClass.fxp", "", "Metric")
IF NOT ooo.AddForm("MyCustomForm2", 15,17, "EPSON Stylus C82 Series")
* Error
ENDIF
ooo = Null
ooo = NEWOBJECT("AddPrinterForm", "AddPrinterFormClass.fxp")
IF NOT ooo.DeleteForm("MyCustomForm1", "EPSON Stylus C82 Series")
? ooo.cErrorMessage
? ooo.cApiErrorMessage
* Error
ENDIF
*AddPrinterFormClass.prg
* 10/26/2004 -- Added function Sys2600() so code can be run in VFP6 and earlier
DEFINE CLASS AddPrinterForm AS Custom
HIDDEN cUnit, cPrinterName, nFormHeight, nFormWidth, nLeftMargin, ;
nTopMargin, nRightMargin, nBottomMargin, ;
nInch2mm, nCm2mm, nCoefficient, hHeap
cUnit = "English" && inches or Metric - cm's
cPrinterName = ""
nFormHeight = 0
nFormWidth = 0
nLeftMargin = 0
nTopMargin = 0
nRightMargin = 0
nBottomMargin = 0
nApiErrorCode = 0
cApiErrorMessage = ""
cErrorMessage = ""
nInch2mm = 25.4
nCm2mm = 10
nCoefficient = 0
hHeap = 0
PROCEDURE Init(tcUnit)
IF PCOUNT() = 1 AND INLIST(tcUnit, "English", "Metric")
This.cUnit = PROPER(tcUnit)
ENDIF
This.LoadApiDlls()
This.hHeap = HeapCreate(0, 4096, 0)
* Use Windows default printer
This.cPrinterName = SET("Printer",2)
This.nCoefficient = IIF(PROPER(This.cUnit) = "English", ;
This.nInch2mm, This.nCm2mm) * 1000
ENDPROC
PROCEDURE Destroy
IF This.hHeap <> 0
HeapDestroy(This.hHeap)
ENDIF
ENDPROC
PROCEDURE SetFormMargins(tnLeft, tnTop, tnRight, tnBottom)
WITH This
.nLeftMargin = tnLeft * .nCoefficient
.nTopMargin = tnTop * .nCoefficient
.nRightMargin = tnRight * .nCoefficient
.nBottomMargin = tnBottom * .nCoefficient
ENDWITH
ENDPROC
PROCEDURE AddForm(tcFormName, tnWidth, tnHeight, tcPrinterName)
LOCAL lhPrinter, llSuccess, lcForm
This.nFormWidth = tnWidth * This.nCoefficient
This.nFormHeight = tnHeight * This.nCoefficient
IF PCOUNT() > 3
This.cPrinterName = tcPrinterName
ENDIF
This.ClearErrors()
lhPrinter = 0
IF OpenPrinter(This.cPrinterName, @lhPrinter, 0) = 0
This.cErrorMessage = "Unable to get printer handle for '" ;
+ This.cPrinterName + "."
This.nApiErrorCode = GetLastError()
This.cApiErrorMessage = This.ApiErrorText(This.nApiErrorCode)
RETURN .F.
ENDIF
lnFormName = HeapAlloc(This.hHeap, 0, LEN(tcFormName) + 1)
* VFP7 and later
= SYS(2600, lnFormName, LEN(tcFormName) + 1, tcFormName + CHR(0))
* VFP6 and earlier
*= Sys2600(lnFormName, LEN(tcFormName) + 1, tcFormName + CHR(0))
* Build FORM_INFO_1 structure
WITH This
lcForm = This.Num2LOng(0) + ; && Flags
This.Num2LOng(lnFormName) + ;
This.Num2LOng(.nFormWidth) + ;
This.Num2LOng(.nFormHeight) + ;
This.Num2LOng(.nLeftMargin) + ;
This.Num2LOng(.nTopMargin) + ;
This.Num2LOng(.nFormWidth - .nRightMargin) + ;
This.Num2LOng(.nFormHeight - .nBottomMargin)
ENDWITH
* Finally, call the API
IF AddForm(lhPrinter, 1, @lcForm) = 0
This.cErrorMessage = "Unable to Add Form '" + tcFormName + "'."
This.nApiErrorCode = GetLastError()
This.cApiErrorMessage = This.ApiErrorText(This.nApiErrorCode)
llSuccess = .F.
ELSE
llSuccess = .T.
ENDIF
= HeapFree(This.hHeap, 0, lnFormName)
= ClosePrinter(lhPrinter)
RETURN llSuccess
PROCEDURE ClearErrors
This.cErrorMessage = ""
This.nApiErrorCode = 0
This.cApiErrorMessage = ""
ENDPROC
PROCEDURE DeleteForm(tcFormName, tcPrinterName)
LOCAL lhPrinter, llSuccess
IF PCOUNT() > 1
This.cPrinterName = tcPrinterName
ENDIF
This.ClearErrors()
lhPrinter = 0
IF OpenPrinter(This.cPrinterName, @lhPrinter, 0) = 0
This.cErrorMessage = "Unable to get printer handle for '" + This.cPrinterName + "."
This.nApiErrorCode = GetLastError()
This.cApiErrorMessage = This.ApiErrorText(This.nApiErrorCode)
RETURN .F.
ENDIF
* Finally, call the API
IF DeleteForm(lhPrinter, tcFormName) = 0
This.cErrorMessage = "Unable to delete Form '" + tcFormName + "'."
This.nApiErrorCode = GetLastError()
This.cApiErrorMessage = This.ApiErrorText(This.nApiErrorCode)
llSuccess = .F.
ELSE
llSuccess = .T.
ENDIF
= ClosePrinter(lhPrinter)
RETURN llSuccess
FUNCTION Num2LOng(tnNum)
DECLARE RtlMoveMemory IN WIN32API AS RtlCopyLong ;
STRING @Dest, Long @Source, Long Length
LOCAL lcString
lcString = SPACE(4)
=RtlCopyLong(@lcString, BITOR(tnNum,0), 4)
RETURN lcString
ENDFUNC
FUNCTION Long2Num(tcLong)
DECLARE RtlMoveMemory IN WIN32API AS RtlCopyNum ;
Long @Dest, String @Source, Long Length
LOCAL lnNum
lnNum = 0
= RtlCopyNum(@lnNum, tcLong, 4)
RETURN lnNum
ENDFUNC
HIDDEN PROCEDURE ApiErrorText
LPARAMETERS tnErrorCode
Local lcErrBuffer
lcErrBuffer = REPL(CHR(0),1024)
= FormatMessage(0x1000 ,.NULL., tnErrorCode, 0, @lcErrBuffer, 1024,0)
RETURN STRTRAN(LEFT(lcErrBuffer, AT(CHR(0),lcErrBuffer)- 1 ), ;
"file", "form", -1, -1, 3)
ENDPROC
HIDDEN PROCEDURE LoadApiDlls
DECLARE INTEGER OpenPrinter IN winspool.drv;
STRING pPrinterName,;
INTEGER @phPrinter,;
INTEGER pDefault
DECLARE INTEGER ClosePrinter IN winspool.drv;
INTEGER hPrinter
DECLARE INTEGER AddForm IN winspool.drv;
INTEGER hPrinter,;
INTEGER LEVEL,;
STRING @pForm
DECLARE INTEGER DeleteForm IN winspool.drv;
INTEGER hPrinter,;
STRING pFormName
DECLARE INTEGER HeapCreate IN Win32API;
INTEGER dwOptions, INTEGER dwInitialSize,;
INTEGER dwMaxSize
DECLARE INTEGER HeapAlloc IN Win32API;
INTEGER hHeap, INTEGER dwFlags, INTEGER dwBytes
DECLARE lstrcpy IN Win32API;
STRING @lpstring1, INTEGER lpstring2
DECLARE INTEGER HeapFree IN Win32API;
INTEGER hHeap, INTEGER dwFlags, INTEGER lpMem
DECLARE HeapDestroy IN Win32API;
INTEGER hHeap
DECLARE INTEGER GetLastError IN kernel32
Declare Integer FormatMessage In kernel32.dll ;
Integer dwFlags, String @lpSource, ;
Integer dwMessageId, Integer dwLanguageId, ;
String @lpBuffer, Integer nSize, Integer Arguments
ENDPROC
ENDDEFINE
*-------------------------------------------------------
FUNCTION Sys2600(tnAddress, tnLength, tcNewString)
IF PCOUNT() = 3
DECLARE RtlMoveMemory IN WIN32API AS RtlCopy ;
INTEGER nDestBuffer, STRING pVoidSource, INTEGER nLength
lcRetVal = LEFT(tcNewString, MIN(tnLength, LEN(tcNewString)))
=RtlCopy(tnAddress, lcRetVal, LEN(lcRetVal))
ELSE
DECLARE RtlMoveMemory IN WIN32API AS RtlCopy ;
STRING @DestBuffer, INTEGER pVoidSource, INTEGER nLength
lcRetVal = REPL(CHR(0),tnLength)
=RtlCopy(@lcRetVal, tnAddress, tnLength)
ENDIF
RETURN lcRetVal 
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نوشته شده توسط mehran_337
How to add/delete custom printer forms under Windows NT/2K/XP Programatically
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