Question

application path for a dll required

Asked by: mindserve

I have a dll and the vendor required the DLL to be coded to the path. Their example hard codes it to the C drive but in my application, I want it to be the app.path.
I can't get the source code for this to work , no matter what I do.
I have tried "& app.path & starioport.dll"  and "app.path & \ starioport.dll"
 But it throws an error for the path..

From the vendor:
As you can see the current path is C:\VB6 and is written as

Public Declare Function ReadPort Lib "C:\\VB6\\starioport.dll"

Be sure to change the path location according to the starioport.dll location on your PC.

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Asked On
2009-06-05 at 16:03:35ID24468521
Topic

Visual Basic Programming

Participating Experts
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Answers

 

by: egl1044Posted on 2009-06-05 at 18:50:25ID: 24561181

You just specify the dll name with no path when you declare the declerations.

1) Windows will look into the current directory.
2) Windows will also check the system directory.

Public Declare Function ReadPort Lib "starioport.dll" () As ?

I see the API is a function and you haven't given a return type for that API so you will also need to make sure your applying the correct return type for that API.

 

by: egl1044Posted on 2009-06-05 at 19:02:14ID: 24561199

While working in the VB IDE and using only the .DLL name in your declerations the .DLL file itself must reside either in the system directory or the installed location of VB6.EXE typically C:\Program Files\Microsoft Visual Studio\VB98. This only applies to debugging after you compile the that .DLL can be placed in the same directory as your executable.

Just remember if you don't want to copy to those locations when debugging in the VB IDE then hardcode the API path to point to the .DLL but when your ready to compile make sure you change it to the .DLL name only and it will work for your current executable path.

 

by: mindservePosted on 2009-06-06 at 06:12:43ID: 24562959

The vendor wants it to be coded to the path. It will not find it on it's own. I tried.... This is not a dll that registers either, but they want a direct path to it. It needs to be in the applications path. Anyone have an idea of how to code it that way. Seems odd, but that's what they want.

 

by: egl1044Posted on 2009-06-06 at 09:54:57ID: 24563531

You will need to provide more detail the only other way I know of is adding a location to the PATH environment block for your session using GetEnvironmentVariable() SetEnvironmentVariable() this would allow you to add one or more extra locations that windows will search to find the.DLL using only the .DLL name but it really doesn't help much because windows already looks in the current directory. Both the .EXE and .DLL must be in same location.

Search Path Used by Windows to Locate a DLL
http://msdn.microsoft.com/en-us/library/7d83bc18(vs.71).aspx

 

by: mindservePosted on 2009-06-06 at 11:17:00ID: 24563829

Public Declare Function ReadPort Lib "C:\\VB6\\starioport.dll"
If I didn't want to hardcode it to the C drive, where would the function go?

 

by: egl1044Posted on 2009-06-06 at 11:26:49ID: 24563865

The declerations is wrong you're using a function with no return parameter so you will more than likely always get and error until you use the correct parameter.
All API declerations go in the module level sections of a module,class, or form.

Public Declare Function ReadPort Lib "starioport.dll" () As Long
Public Declare Function ReadPort Lib "starioport.dll" () As Byte
Public Declare Function ReadPort Lib "starioport.dll" () As String

The above three examples is how the it should be declared but you must use the correct return type which I can't help you with because I have no documentation for starioport.dll.
Do you have a link to the vendor documention you refer to in your original question?

 

by: mindservePosted on 2009-06-06 at 11:41:59ID: 24563938

 

by: egl1044Posted on 2009-06-06 at 12:11:20ID: 24564024

What device is your printer port using? USB, Network printer, LPT1, COM?

 

by: mindservePosted on 2009-06-06 at 12:27:49ID: 24564070

I have two test printers. One USB and one COM. most of my customer will be using usb.

 

by: egl1044Posted on 2009-06-06 at 12:40:02ID: 24564096

After reading the documentation this seems to be the declerations for the .DLL. I added a simple example to check the printer status hopefully it works as I can not test it.

If you want to test this in the VBIDE then you must copy the DLL like I mentions in posts (1 and 2) otherwise just compile it as an .EXE and drop your .EXE into the same location as the .DLL

Create a new project.
Add 1 Command button to a form.
Copy paste the the below into the form.

' http://www.starmicronics.com/absolutefm/absolutefm/afmviewfaq.aspx?topicid=11&faqid=20
 
Option Explicit
 
Private Type StarPrinterStatus_2
    ' printer status 1
    coverOpen As Long
    offline As Long
    compulsionSwitch As Long
    ' printer status 2
    overTemp As Long
    unrecoverableError As Long
    cutterError As Long
    mechError As Long
    headThermistorError As Long
    ' printer status 3
    receiveBufferOverflow As Long
    pageModeCmdError As Long
    blackMarkError As Long
    presenterPaperJamError As Long
    headUpError As Long
    voltageError As Long
    ' printer status 4
    receiptBlackMarkDetection As Long
    receiptPaperEmpty As Long
    receiptPaperNearEmptyInner As Long
    receiptPaperNearEmptyOuter As Long
    ' printer status 5
    presenterPaperPresent As Long
    peelerPaperPresent As Long
    stackerFull As Long
    slipTOF As Long
    slipCOF As Long
    slipBOF As Long
    validationPaperPresent As Long
    slipPaperPresent As Long
    ' printer status 6
    etbAvailable As Long
    etbCounter As Byte
    ' printer status 7
    presenterState As Byte
    ' raw
    rawLength As Long
    raw(0 To 62) As Byte
End Type
 
Private Declare Function OpenPortA Lib "starioport.dll" (ByVal portName As String, ByVal portSettings As String, ByVal timeOut As Long) As Long
Private Declare Function ReadPort Lib "starioport.dll" (ByVal port As Long, ByRef readBuffer As Byte, ByVal size As Long, ByRef sizeCommunicated As Long) As Long
Private Declare Function WritePort Lib "starioport.dll" (ByVal port As Long, ByRef command As Byte, ByVal size As Long, ByRef communicated As Long) As Long
Private Declare Function ClosePort Lib "starioport.dll" (ByVal port As Long) As Long
Private Declare Function GetOnlineStatus Lib "starioport.dll" (ByVal port As Long, ByRef onlineStatus As Long) As Long
Private Declare Function GetParsedStatusEx Lib "starioport.dll" (ByVal port As Long, ByRef printerStatus As StarPrinterStatus_2, ByVal level As Long) As Long
Private Declare Function BeginCheckedBlockEx Lib "starioport.dll" (ByVal port As Long, ByRef printerStatus As StarPrinterStatus_2, ByVal level As Long) As Long
Private Declare Function EndCheckedBlockEx Lib "starioport.dll" (ByVal port As Long, ByRef printerStatus As StarPrinterStatus_2, ByVal level As Long) As Long
Private Declare Function ResetDevice Lib "starioport.dll" (ByVal port As Long) As Long
 
Sub GetPrinterStatus(ByVal szPortName As String)
  
  Dim hPort     As Long
  Dim dwStatus  As Long
  
  ' This function opens a connection to the port specified.
  If szPortName = "COMx" Then
    hPort = OpenPortA(szPortName, "9600,n,8,1,h", 30000)
  Else
    hPort = OpenPortA(szPortName, "", 30000)
  End If
  
  ' Sanity check
  If hPort = 0 Then
    Debug.Print "Failed to open printer port."
    Exit Sub
  End If
  
  ' This function retreives the device's online status.
  ' 0 = offline, 1 = online
  Call GetOnlineStatus(hPort, dwStatus)
  
  Select Case dwStatus
    Case 0
      Debug.Print "Printer offline"
    Case 1
      Debug.Print "Printer online"
  End Select
  
  ' This function closes a connection to the port specified.
  Call ClosePort(hPort)
  
End Sub
 
Private Sub Command1_Click()
  
  ' usbven:               [opens the first available USB Vendor Class device]
  ' usbven:sNsNsNsN       [opens the USB Vendor Class device with that serial number]
  ' usbven:COMx           [opens the USB Vendor Class device that has been assigned to COMx]
  ' COMx                  [opens the real serial port]
  ' LPTx                  [opens the real parallel port]
  ' tcp:192.168.11.3      [opens the network printer at the specified IP address
  
  Call GetPrinterStatus("usbven:")
  
 End Sub

                                              
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