Hola Mario!!. Tan chico es el mundo que nos escribimos por mail estando
en la misma ciudad.
Te mando la información que vos pediste acerca de winspool.drv y un
ejemplo en VB (tomado de MSDN julio 98).
HOWTO: Send Raw Data to a Printer Using the Win32 API from VB
Last reviewed: January 15, 1998
Article ID: Q154078 The information in this article applies to:
•Standard, Professional, and Enterprise Editions of Microsoft Visual
Basic, 32-bit only, for Windows, version 4.0
SUMMARY
Although the printer object under Visual Basic 4.0 has been greatly
improved, there may still be times when it is desirable to use the Win
32 API to send information directly to the printer. Below is a code
sample showing how to achieve this behavior.
MORE INFORMATION
1.Start a new project in Visual Basic. Form1 is created by default.
2.Place a Command Button on the form.
3.Add the following code to the Form1 code window:
Option Explicit
Private Type DOCINFO
pDocName As String
pOutputFile As String
pDatatype As String
End Type
Private Declare Function ClosePrinter Lib "winspool.drv" (ByVal _
hPrinter As Long) As Long
Private Declare Function EndDocPrinter Lib "winspool.drv" (ByVal _
hPrinter As Long) As Long
Private Declare Function EndPagePrinter Lib "winspool.drv" (ByVal
_
hPrinter As Long) As Long
Private Declare Function OpenPrinter Lib "winspool.drv" Alias _
"OpenPrinterA" (ByVal pPrinterName As String, phPrinter As
Long, _
ByVal pDefault As Long) As Long
Private Declare Function StartDocPrinter Lib "winspool.drv" Alias
_
"StartDocPrinterA" (ByVal hPrinter As Long, ByVal Level As
Long, _
pDocInfo As DOCINFO) As Long
Private Declare Function StartPagePrinter Lib "winspool.drv"
(ByVal _
hPrinter As Long) As Long
Private Declare Function WritePrinter Lib "winspool.drv" (ByVal _
hPrinter As Long, pBuf As Any, ByVal cdBuf As Long, _
pcWritten As Long) As Long
Private Sub Command1_Click()
Dim lhPrinter As Long
Dim lReturn As Long
Dim lpcWritten As Long
Dim lDoc As Long
Dim sWrittenData As String
Dim MyDocInfo As DOCINFO
lReturn = OpenPrinter("Call Screener Printer", lhPrinter, 0)
If lReturn = 0 Then
MsgBox "The Printer Name you typed wasn't recognized."
Exit Sub
End If
MyDocInfo.pDocName = "AAAAAA"
MyDocInfo.pOutputFile = vbNullString
MyDocInfo.pDatatype = vbNullString
lDoc = StartDocPrinter(lhPrinter, 1, MyDocInfo)
Call StartPagePrinter(lhPrinter)
sWrittenData = "How's that for Magic !!!!" & vbFormFeed
lReturn = WritePrinter(lhPrinter, ByVal sWrittenData, _
Len(sWrittenData), lpcWritten)
lReturn = EndPagePrinter(lhPrinter)
lReturn = EndDocPrinter(lhPrinter)
lReturn = ClosePrinter(lhPrinter)
End Sub
REFERENCES
The Win32 SDK Help files give a more detailed description of the APIs
used in the sample.
For more information, please see the following article in the Microsoft
Knowledge Base:
ARTICLE-ID: Q138594
TITLE : HOWTO: Send Raw Data to a Printer by Using the Win32 API
--
Julio Daniel Moreyra
Analista de Sistemas
Sup. Tribunal de Justicia - Chubut
e-mail: jmoreyra@juschub.satlink.net
Rivadavia y Jones s/n - Rawson (9103) - Chubut - Argentina
Te: 54-0965-82331
Fax: 54-0965-82335
Mensaje enviado por "meletaes" <meletaes@yahoo.es> el 14/03/2002
Prueba con esto a ver cómo te va:
' Win32 API para mandar caracteres directamente al puerto de la impresora por defecto
'
Private Declare Function GetProfileString Lib "kernel32"
Alias "GetProfileStringA" (ByVal lpAppName As String, ByVal lpKeyName
As Any, ByVal lpDefault As String, ByVal lpReturnedString As String,
ByVal nSize As Long) As Long
Private Declare Function OpenPrinter Lib "winspool.drv"
Alias "OpenPrinterA" (ByVal pPrinterName As String, phPrn As Long,
pDefault As Any) As Long
Private Declare Function StartDocPrinter Lib "winspool.drv"
Alias "StartDocPrinterA" (ByVal hprn As Long, ByVal Level As Long,
pDocInfo As DOC_INFO_1) As Long
Private Declare Function StartPagePrinter Lib "winspool.drv" (ByVal
hprn As Long) As Long
Private Declare Function WritePrinter Lib "winspool.drv" (ByVal hprn
As Long, pBuf As Any, ByVal cdBuf As Long, pcWritten As Long) As Long
Private Declare Function EndPagePrinter Lib "winspool.drv" (ByVal
hprn As Long) As Long
Private Declare Function EndDocPrinter Lib "winspool.drv" (ByVal hprn
As Long) As Long
Private Declare Function ClosePrinter Lib "winspool.drv" (ByVal hprn
As Long) As Long
Public Declare Function ShellExecute Lib "shell32.dll"
Alias "ShellExecuteA" (ByVal hwnd As Long, ByVal lpOperation As
String, ByVal lpFile As String, ByVal lpParameters As String, ByVal
lpDirectory As String, ByVal nShowCmd As Long) As Long
'
' Estructura requerida para StartDocPrinter
'
Private Type DOC_INFO_1
pDocName As String
pOutputFile As String
pDatatype As String
End Type
Dim bien As Long
Public Sub Iniciar_Spool(PrnName As String, hprn As Long)
'Abrir impresora, donde PRnName es el DeviceName de la impresora.Se
devuelve hprn como identificador
Dim di As DOC_INFO_1
di.pDocName = "Cadena"
di.pOutputFile = vbNullString
di.pDatatype = "RAW"
Call OpenPrinter(PrnName, hprn, ByVal 0&)
Call StartDocPrinter(hprn, 1, di)
Call StartPagePrinter(hprn)
End Sub
Public Sub Fin_Spool(ByVal hprn As Long)
'Cerrar impresora
Call EndPagePrinter(hprn)
Call EndDocPrinter(hprn)
Call ClosePrinter(hprn)
End Sub
Public Sub imprimir_Spool(ByVal strCadena As String, ByVal hprn As
Long, salto As Integer)
'Imprimir cadena
Dim Buffer() As Byte
Dim Written As Long
Dim i As Long, j As Long
Const BufSize As Long = &H50 '80 CARACTERES
Dim BytesStr As Long
Dim acopiar$
Dim csalto$
Dim cretorno$
Dim veces As Integer
Dim asciicadena As String
asciicadena = cadena_ansi_a_ascii(strCadena)
cretorno = Chr(10) 'Salto linea
csalto = Chr(13) 'Retorno carro
veces = 1
If salto Then veces = 3
Do While veces > 0
If salto Then
If veces = 3 Then 'Cadena
acopiar = asciicadena
Else
If veces = 2 Then 'Salto
acopiar = csalto
Else 'Retorno
acopiar = cretorno
End If
End If
Else 'No salto
acopiar = asciicadena
End If
BytesStr = ((Len(acopiar)) * 2) - 1
ReDim Buffer(1 To BufSize) As Byte
For i = 1 To UBound(Buffer)
Buffer(i) = &H20 'Rellenar a blancos el buffer
Next i
Buffer() = acopiar$ 'Llenar el buffer
Call WritePrinter(hprn, Buffer(0), BytesStr, Written) 'Imprimir
veces = veces - 1
Loop
End Sub
Ejemplo llamadas:
Call Iniciar_Spool(prn.DeviceName, himp)
Call imprimir_Spool(linea, himp, True) 'En linea van los
caracteres y codigos de escape
Call Fin_Spool(himp)
Un saludo
Miren