Imports problem using vbc
I am trying to learn a little bit about ASP.NET and so I have armed myself with Web Matrix and a book of examples to work through, "ASP.NET at Work".
Early on I have been introduced to the idea of creating a DLL called database.dll and using it in my pages. I compiled it into the bin folder using a make.bat file to run a command line
"vbc /debug /nologo /t:library /out:%1.dll /r:System.dll /r:System.Xml.dll /r:System.Web.dll /r:System.Data.dll %1.vb"
Everything seemed to work as expected and my pages were able to use the new Databse.dll.
The next stage was to create another DLL which imports the previously compiled database.dll. When I try to compile it I get numerous errors, the first of which suggests that the Database.dll cannot be found. "BC30466: Namespace or type 'Database' for the Imports 'Database' cannot be found." This problem presumably leads to some of the errors that follow.
My question is how can I compile a dll which imports a dll that I have already compiled using VBC?
Early on I have been introduced to the idea of creating a DLL called database.dll and using it in my pages. I compiled it into the bin folder using a make.bat file to run a command line
"vbc /debug /nologo /t:library /out:%1.dll /r:System.dll /r:System.Xml.dll /r:System.Web.dll /r:System.Data.dll %1.vb"
Everything seemed to work as expected and my pages were able to use the new Databse.dll.
The next stage was to create another DLL which imports the previously compiled database.dll. When I try to compile it I get numerous errors, the first of which suggests that the Database.dll cannot be found. "BC30466: Namespace or type 'Database' for the Imports 'Database' cannot be found." This problem presumably leads to some of the errors that follow.
My question is how can I compile a dll which imports a dll that I have already compiled using VBC?
ASKER
Thanks for your reply graye.
It looks to me as if the LibPath option is relevant if you are not in the current working directory and I think I am.
I have opened an MS-Dos session and used CD to navigate to the folder with my source and dll files. This folder is a bin folder beneath my project folder. My PATH variable includes C:\WINNT\Microsoft.NET\Fra
This is the database.vb file that compiles successfully and can be used by importing it into aspx pages....
Imports System.Data
Imports System.Data.OleDb
Imports System.Configuration
Namespace Database
Public Class Database
Private m_oConn As OleDbConnection
Public Sub New()
Dim oConf As ConfigurationSettings
If oConf.AppSettings("Connect
'Throw New Exception("Connection string not found in application configuration file.")
Else
m_oConn = New OleDbConnection(oConf.AppS
m_oConn.Open()
End If
End Sub
'Public Sub New(ByVal sConnectionString As String)
' m_oConn = New OleDbConnection(sConnectio
' m_oConn.Open()
'End Sub
'so that other objects can use the connection
'Public ReadOnly Property Connection() As OleDbConnection
' Get
' Return m_oConn
' End get
'End Property
Public Function Execute(ByVal sSQL As String) As Integer
Dim lRecords As Long
Dim oCmd As New OleDbCommand
oCmd.Connection = m_oConn
oCmd.CommandText = sSQL
oCmd.CommandType = CommandType.Text
lRecords = oCmd.ExecuteNonQuery()
Return lRecords
End function
Public Function GetDataReader(ByVal sSQL As String) As OleDbDataReader
Dim oCmd As New OleDbCommand
Dim oDR As OleDbDataReader
oCmd.Connection = m_oConn
oCmd.CommandText = sSQL
oCmd.CommandType = CommandType.Text
oDR = oCmd.ExecuteReader
'oDR.Read()
Return oDR
End function
'Public Function GetDataSet(ByVal sSQL As String) As OleDbDataSet
' Dim oDA As New OleDbdataAdapter(sSQL, m_oConn)
' Dim oDS As OleDbDataReader("Results")
' oDA.Fill(oDS)
' Return oDS
'End function
Public Sub Close()
m_oConn.Close()
End Sub
End Class
End Namespace
This is the baseclass.vb file that should use the previously compiled database.dll file....
Imports System.Text
Imports System.Collections
Imports Database
Namespace BaseClass
Public MustInherit Class BaseClass
Private m_aErrors As ArrayList
Protected m_oDB As Database
Protected m_oDA As OleDbDataAdapter
Protected m_oCB As OleDbCommandBuilder
Protected m_oDS As OleDbsDataSet
Protected Sub New(ByVal oDB As Database, ByVal sSQL As String)
m_oDB = oDB
m_oDA = New OleDbDataAdapter(sSQL, m_oDB.Connection)
m_oCB = New OleDbCommandBuilder(m_oDA)
m_oDS = New OleDbDataSet()
m_oDA.Fill(m_oDS)
End Sub
Public Function GetRow() As DataRow
If m_oDS.Tables(0).Rows.Count
Return m_oDS.Tables(0).Rows(0)
Else
Return m_oDS.Tables(0).NewRow()
End If
End Function
Protected Sub SaveRow(ByVal oDR As DataRow)
Dim oDC As DataColumn
If m_oDS.Tables(0).Rows.Count
m_oDS.Tables(0).Rows.Add(o
Exit Sub
End If
m_oDS.Tables(0).Rows(0).Be
For Each oDC In m_oDS.Tables(0).Columns
m_oDS.Tables(0).Rows(0).It
Next
m_oDS.Tables(0).Rows(0).En
End SUb
Protected Sub AddError(ByVal sInput As String)
If m_aErrors Is Nothing Then
m_aErrors = New ArrayList()
End If
m_aErrors.Add(sInput)
End Sub
Protected Sub ClearErrors()
If m_aErrors Is Nothing Then
m_aErrors = New ArrayList()
Else
m_aErrors.Clear()
End If
End Sub
Public Function ValidationError(Optional ByVal sHeader As String _
= "The following errors were detected in your data:" & vbCrLf, _
Optional ByVal sItemFormat As String = "- {0}" & vbCrLf, _
Optional ByVal sFooter As String = "") As String
Dim sMessage As New StringBuilder()
Dim sError As String
If m_aErrors.Count > 0 Then
sMessage.Append(sHeader)
For Each sError In m_aErrors
sMessage.AppendFormat(sIte
Next
sMessage.Append(sFooter)
Return sMessage.ToString
Else
Return ""
End If
End Function
Public readOnly Property ValidationErrors() As ArrayList
Get
Return m_aErrors
End Get
End Property
Public ReadOnly Property IsValid() As Boolean
Get
Return(m_aErrors.Count = 0)
End Get
End Property
End Class
End Namespace
And this is the batch file that I am using to try and compile the files....
echo off
if [%1] == [] goto noparam
if [%2] == [] goto noimports
vbc /debug /nologo /t:library /imports:%2.dll /r:System.dll,System.Xml.d
goto ok
:noimports
vbc /debug /nologo /t:library /r:System.dll,System.Xml.d
goto ok
:noparam
echo No file name was provided for compiling.
echo Use: Make FileName ImportFileName1,ImportFile
:ok
if errorlevel==0 echo %1.dll complied successfully.
It looks to me as if the LibPath option is relevant if you are not in the current working directory and I think I am.
I have opened an MS-Dos session and used CD to navigate to the folder with my source and dll files. This folder is a bin folder beneath my project folder. My PATH variable includes C:\WINNT\Microsoft.NET\Fra
This is the database.vb file that compiles successfully and can be used by importing it into aspx pages....
Imports System.Data
Imports System.Data.OleDb
Imports System.Configuration
Namespace Database
Public Class Database
Private m_oConn As OleDbConnection
Public Sub New()
Dim oConf As ConfigurationSettings
If oConf.AppSettings("Connect
'Throw New Exception("Connection string not found in application configuration file.")
Else
m_oConn = New OleDbConnection(oConf.AppS
m_oConn.Open()
End If
End Sub
'Public Sub New(ByVal sConnectionString As String)
' m_oConn = New OleDbConnection(sConnectio
' m_oConn.Open()
'End Sub
'so that other objects can use the connection
'Public ReadOnly Property Connection() As OleDbConnection
' Get
' Return m_oConn
' End get
'End Property
Public Function Execute(ByVal sSQL As String) As Integer
Dim lRecords As Long
Dim oCmd As New OleDbCommand
oCmd.Connection = m_oConn
oCmd.CommandText = sSQL
oCmd.CommandType = CommandType.Text
lRecords = oCmd.ExecuteNonQuery()
Return lRecords
End function
Public Function GetDataReader(ByVal sSQL As String) As OleDbDataReader
Dim oCmd As New OleDbCommand
Dim oDR As OleDbDataReader
oCmd.Connection = m_oConn
oCmd.CommandText = sSQL
oCmd.CommandType = CommandType.Text
oDR = oCmd.ExecuteReader
'oDR.Read()
Return oDR
End function
'Public Function GetDataSet(ByVal sSQL As String) As OleDbDataSet
' Dim oDA As New OleDbdataAdapter(sSQL, m_oConn)
' Dim oDS As OleDbDataReader("Results")
' oDA.Fill(oDS)
' Return oDS
'End function
Public Sub Close()
m_oConn.Close()
End Sub
End Class
End Namespace
This is the baseclass.vb file that should use the previously compiled database.dll file....
Imports System.Text
Imports System.Collections
Imports Database
Namespace BaseClass
Public MustInherit Class BaseClass
Private m_aErrors As ArrayList
Protected m_oDB As Database
Protected m_oDA As OleDbDataAdapter
Protected m_oCB As OleDbCommandBuilder
Protected m_oDS As OleDbsDataSet
Protected Sub New(ByVal oDB As Database, ByVal sSQL As String)
m_oDB = oDB
m_oDA = New OleDbDataAdapter(sSQL, m_oDB.Connection)
m_oCB = New OleDbCommandBuilder(m_oDA)
m_oDS = New OleDbDataSet()
m_oDA.Fill(m_oDS)
End Sub
Public Function GetRow() As DataRow
If m_oDS.Tables(0).Rows.Count
Return m_oDS.Tables(0).Rows(0)
Else
Return m_oDS.Tables(0).NewRow()
End If
End Function
Protected Sub SaveRow(ByVal oDR As DataRow)
Dim oDC As DataColumn
If m_oDS.Tables(0).Rows.Count
m_oDS.Tables(0).Rows.Add(o
Exit Sub
End If
m_oDS.Tables(0).Rows(0).Be
For Each oDC In m_oDS.Tables(0).Columns
m_oDS.Tables(0).Rows(0).It
Next
m_oDS.Tables(0).Rows(0).En
End SUb
Protected Sub AddError(ByVal sInput As String)
If m_aErrors Is Nothing Then
m_aErrors = New ArrayList()
End If
m_aErrors.Add(sInput)
End Sub
Protected Sub ClearErrors()
If m_aErrors Is Nothing Then
m_aErrors = New ArrayList()
Else
m_aErrors.Clear()
End If
End Sub
Public Function ValidationError(Optional ByVal sHeader As String _
= "The following errors were detected in your data:" & vbCrLf, _
Optional ByVal sItemFormat As String = "- {0}" & vbCrLf, _
Optional ByVal sFooter As String = "") As String
Dim sMessage As New StringBuilder()
Dim sError As String
If m_aErrors.Count > 0 Then
sMessage.Append(sHeader)
For Each sError In m_aErrors
sMessage.AppendFormat(sIte
Next
sMessage.Append(sFooter)
Return sMessage.ToString
Else
Return ""
End If
End Function
Public readOnly Property ValidationErrors() As ArrayList
Get
Return m_aErrors
End Get
End Property
Public ReadOnly Property IsValid() As Boolean
Get
Return(m_aErrors.Count = 0)
End Get
End Property
End Class
End Namespace
And this is the batch file that I am using to try and compile the files....
echo off
if [%1] == [] goto noparam
if [%2] == [] goto noimports
vbc /debug /nologo /t:library /imports:%2.dll /r:System.dll,System.Xml.d
goto ok
:noimports
vbc /debug /nologo /t:library /r:System.dll,System.Xml.d
goto ok
:noparam
echo No file name was provided for compiling.
echo Use: Make FileName ImportFileName1,ImportFile
:ok
if errorlevel==0 echo %1.dll complied successfully.
ASKER CERTIFIED SOLUTION
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ASKER
I have now renamed my namespaces to nsDatabase and nsBaseClass.
I am getting some different errors which are probably more to do with what else is inside the .vb files.
"Type 'OleDbdataAdapter' is not defined" etc.
I'll carry on tinkering and let you know how I get on.
I am getting some different errors which are probably more to do with what else is inside the .vb files.
"Type 'OleDbdataAdapter' is not defined" etc.
I'll carry on tinkering and let you know how I get on.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vblr7/html/vaconInvokingCommandLineCompiler.asp