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Thursday, November 21, 2013

Storing PDFs in MS Access

Store is as a binary:http://stackoverflow.com/questions/858915/storing-pdfs-in-ms-access-database-using-forms

Function LoadFileFromDisk(Bestand, Optional FileName As String = "")
  Dim imgByte() As Byte
  If FileName = "" Then FileName = strFileName
  Open FileName For Binary Lock Read As #1
  ReDim imgByte(1 To LOF(1))
  Get #1, , imgByte
  Close #1
  If Not IsEmpty(imgByte) Then Bestand.Value = imgByte
End Function
This text is after the block

Microsoft website solution is quite long: http://support.microsoft.com/kb/103257


Amara BLOB example:

http://www.ammara.com/access_image_faq/read_write_blob.html


'Read the file 'Image-In.jpg' into the field named 'Image'.
FileToBlob "C:\Photos\Image-In.jpg", [Image]

'Extract the file contained in the field named 'Image' to a file named 'Image-Out.jpg'.
BlobToFile "C:\Photos\Image-Out.jpg", [Image]




'Function:  BlobToFile - Extracts the data in a binary field to a disk file.
'Parameter: strFile - Full path and filename of the destination file.
'Parameter: Field - The field containing the blob.
'Return:    The length of the data extracted.
Public Function BlobToFile(strFile As StringByRef Field As ObjectAs Long
    On Error GoTo BlobToFileError

    Dim nFileNum As Integer
    Dim abytData() As Byte
    BlobToFile = 0
    nFileNum = FreeFile
    Open strFile For Binary Access Write As nFileNum
    abytData = Field
    Put #nFileNum, , abytData
    BlobToFile = LOF(nFileNum)

BlobToFileExit:
    If nFileNum > 0 Then Close nFileNum
    Exit Function

BlobToFileError:
    MsgBox "Error " & err.Number & ": " & err.Description, vbCritical, _
           "Error writing file in BlobToFile"
    BlobToFile = 0
    Resume BlobToFileExit

End Function


'Function:  FileToBlob - Loads a file into a binary field.
'Parameter: strFile - Full path and filename of the source file.
'Parameter: Field - The binary field into which the file is to be loaded.
Public Function FileToBlob(strFile As StringByRef Field As Object)
    On Error GoTo FileToBlobError

    If Len(Dir(strFile)) > 0 Then
        Dim nFileNum As Integer
        Dim byteData() As Byte

        nFileNum = FreeFile()
        Open strFile For Binary Access Read As nFileNum
        If LOF(nFileNum) > 0 Then
            ReDim byteData(1 To LOF(nFileNum))
            Get #nFileNum, , byteData
            Field = byteData
        End If
    Else
        MsgBox "Error: File not found", vbCritical, _
               "Error reading file in FileToBlob"
    End If

FileToBlobExit:
    If nFileNum > 0 Then Close nFileNum
    Exit Function

FileToBlobError:
    MsgBox "Error " & err.Number & ": " & err.Description, vbCritical, _
           "Error reading file in FileToBlob"
    Resume FileToBlobExit

End Function


Display BLOB images in MS Access Report
http://bytes.com/topic/access/answers/909583-how-display-blob-images-ms-access-report


http://bytes.com/topic/access/answers/564980-image-blobs-please-help

ADO stream object - this may only work with SQL
http://support.microsoft.com/kb/258038

CodeProject
http://www.codeproject.com/Articles/16851/Uploading-and-Downloading-BLOBs-to-Microsoft-Acces

Opening Excel application using VBA

In the references, add in "Microsoft Excel n Object Library".

Then the code should look as follows:


Dim exApp As Excel.Application
Set exApp = CreateObject("Excel.Application")
exApp.Visible = True

Microsoft Access Dim dbs object

When writing code in previous version of Microsoft Access, the database object could be dimensioned with the following line:

    Dim dbs As Database

That line now cause a compile error. MS Access is able to find the reference by changing it to:

    Dim dbs As DAO.Database

Using a file dialog box in Access 2010

When installing a "Microsoft Common Dialog Control 6.0" in an Access 2010 form, I receive the error "You don't have the license required to use this ActiveX control".

Apparently the ActiveX controls have a lot of new limitations for security reasons in Access 2010.

To work around this, I dimenioned the control directly in the code as follows:


Dim f As FileDialog
Set f = Application.FileDialog(msoFileDialogFilePicker)
f.Show
MsgBox "file choose was " & f.SelectedItems(1)

When doing this, make sure to add "Microsoft Office 14.0 Object Library" to the references.

Arduino HTTP Request

This worked on April 11, 2025 for an Arduino R4 using the Arduino Desktop IDE on a Windows 11 computer.  Make Sure that the Arduino IDE is u...