Opening a cash drawer in vb6
$30-100 USD
Paid on delivery
I have a small module witin a large program written in vb6 written by a coder who is no longer available. He was very good so I suspect he was on the right track. The actual code can be found in the next section called "Deliverables"
The purpose of this module is to open a cash register drawer hooked to a Star Micronics 8340 receipt printer by sending a control code (chr$(7)) to the printer which sent it to the cash drawer which is tehn supposed to open.
The 8340 printer has NT drivers so that data can be spooled and then sent to the printer. Therefore opening com ports and send the control creates conflicts and errors. That is wy the coder went in the direction he did.
I want you to tell me what is wrong with the attached code. since you don't have a cash drawer, it may be a hit and miss proposition since I will have to make the changes and testing here. If you have had any experience with 8340 printers please let me [url removed, login to view] for a coder at least with 5 years vb6 experience for this and other vb6 projects involving receipt printers..
## Deliverables
Public Function OpenCashDrawer(PrinterName) As Boolean
On Error GoTo Whoops
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(PrinterName, lhPrinter, 0)
'NOTE1 At this point lReturn always = 0; which will exit the function in next code.
'NOTE2 I have experiment with putting "lreturn =1" at this point in the code to bypass next lines but drawer does not open.
If lReturn = 0 Then
OpenCashDrawer = False
Exit Function
End If
[url removed, login to view] = "Register" & CStr(Timer)
[url removed, login to view] = vbNullString
[url removed, login to view] = vbNullString
lDoc = StartDocPrinter(lhPrinter, 1, MyDocInfo)
Call StartPagePrinter(lhPrinter)
sWrittenData = Chr(7)
lReturn = WritePrinter(lhPrinter, ByVal sWrittenData, _
Len(sWrittenData), lpcWritten)
lReturn = EndPagePrinter(lhPrinter)
lReturn = EndDocPrinter(lhPrinter)
lReturn = ClosePrinter(lhPrinter)
OpenCashDrawer = True
Exit Function
Whoops:
On Error Resume Next
lReturn = EndPagePrinter(lhPrinter)
lReturn = EndDocPrinter(lhPrinter)
lReturn = ClosePrinter(lhPrinter)
OpenCashDrawer = False
End Function
The following code is in a variety of places in the program to invoke the above function:
Dim oPrint As [url removed, login to view]
If HasCashDrawer = False Or LapTop = True Then
Exit Sub
End If
Set oPrint = New [url removed, login to view]
[url removed, login to view] LocalPrinter
Set oPrint = Nothing>
Dim oPrint As [url removed, login to view]
If HasCashDrawer = False Or LapTop = True Then
Exit Sub
End If
Set oPrint = New [url removed, login to view]
[url removed, login to view] LocalPrinter
Set oPrint = Nothing
The following code is in a separate class module which has relevance to the avove codes.
Option Explicit
Private RegFont As String
Private RegFontColor As String
Private ExpFont As String
Private ExpFontColor As String
Private RegFontMaxChar As Integer
Private ExpFontMaxChar As Integer
Private PrinterName As String
Private PrintStarted As Boolean
Private Type DOCINFO
pDocName As String
pOutputFile As String
pDatatype As String
End Type
Private Declare Function ClosePrinter Lib "[url removed, login to view]" (ByVal _ hPrinter As Long) As Long
Private Declare Function EndDocPrinter Lib "[url removed, login to view]" (ByVal _ hPrinter As Long) As Long
Private Declare Function EndPagePrinter Lib "[url removed, login to view]" (ByVal _ hPrinter As Long) As Long
Private Declare Function OpenPrinter Lib "[url removed, login to view]" Alias _ "OpenPrinterA" (ByVal pPrinterName As String,
phPrinter As Long, _ ByVal pDefault As Long) As Long
Private Declare Function StartDocPrinter Lib "[url removed, login to view]" Alias _ "StartDocPrinterA" (ByVal hPrinter As Long, ByVal
Level As Long, _ pDocInfo As DOCINFO) As Long
Private Declare Function StartPagePrinter Lib "[url removed, login to view]" (ByVal _ hPrinter As Long) As Long
Private Declare Function WritePrinter Lib "[url removed, login to view]" (ByVal _ hPrinter As Long, pBuf As Any, ByVal cdBuf As Long, _ pcWritten As Long) As Long
Private PrinterFound As Boolean
1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done.
2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request.
3) Complete ownership and distribution copyrights to all work purchased.
## Platform
NT 4 workstation
Project ID: #2918490
About the project
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