VBA Tesseract and Magick from PDF>JPG>Text

drag1c

New Member
Joined
Aug 7, 2019
Messages
17
Office Version
  1. 2013
Platform
  1. Windows
Hello everyone,
I am trying to use script below to do OCR, but it does not work. I found problem in part "Shell". Simply, it does not convert PDF to JPG.
Does anyone know how to fix?

VBA Code:
Option Explicit

#If Win64 Then 'depending on 64 or 32 bit windows
    Public Declare PtrSafe Sub Sleep Lib "kernel32" ( _
        ByVal dwMilliseconds As Long)
    Public Declare PtrSafe Function APIMsgBox Lib "user32" Alias "MessageBoxA" _
        (Optional ByVal hWnd As Long, _
        Optional ByVal prompt As String, _
        Optional ByVal title As String, _
        Optional ByVal buttons As Long) _
        As Long
    Public Declare PtrSafe Function FindWindow Lib "user32" Alias "FindWindowA" ( _
         ByVal lpClassName As String, _
         ByVal lpWindowName As String) As LongPtr
    Public Declare PtrSafe Function GetDesktopWindow Lib "user32" () _
        As Long
    Public Declare PtrSafe Function FindWindowEx Lib "user32" Alias "FindWindowExA" _
        (ByVal hWnd1 As Long, _
        ByVal hWnd2 As Long, _
        ByVal lpsz1 As String, _
        ByVal lpsz2 As String) _
        As Long
#Else
    Public Declare Sub Sleep Lib "kernel32" ( _
        ByVal dwMilliseconds As Long)
    Public Declare Function APIMsgBox Lib "user32" Alias "MessageBoxA" _
        (Optional ByVal hWnd As Long, _
        Optional ByVal prompt As String, _
        Optional ByVal title As String, _
        Optional ByVal buttons As Long) _
        As Long
    Public Declare Function FindWindow Lib "user32" Alias "FindWindowA" ( _
         ByVal lpClassName As String, _
         ByVal lpWindowName As String) As LongPtr
    Declare Function GetDesktopWindow Lib "user32" () _
        As Long
    Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" _
        (ByVal hWnd1 As Long, _
        ByVal hWnd2 As Long, _
        ByVal lpsz1 As String, _
        ByVal lpsz2 As String) _
        As Long
#End If

'Tools:
'- Magick
'- Tesseract

'References:
'- Visual Basic for Applications
'- Microsoft Excel 16.0 Object Library
'- OLE Automation
'- Microsoft Office 16.0 Office Library
'- Microsoft Scripting Runtime

'Sub procedures:
'PDF_to_Txt_Part_01_Loop_through_files
'PDF_to_Txt_Part_02_Convert_pdf_to_jpg
'PDF_to_Txt_Part_03_Read_text_from_jpg
'PDF_to_Txt_Part_04_Wait_for_Magick_and_Tesseract_to_finish
'PDF_to_Txt_Part_05_Combining_all_text_files_into_1

'NOTE each sub works on its own. There are 5 parts for educational purpose.
'If you just want to final result then go to part 05

'Last successfull testrun of all subs on 17.01.2021

Sub PDF_to_Txt_Part_01_Loop_through_files()

Dim FSO As Scripting.FileSystemObject
Dim oFolderPDF As Scripting.Folder
Dim oFile As Scripting.File
Dim sFolderPDF As String

Set FSO = CreateObject("Scripting.FileSystemObject")
sFolderPDF = "C:\Users\logistics.rs\Desktop\PDFs"
Set oFolderPDF = FSO.GetFolder(sFolderPDF)

For Each oFile In oFolderPDF.Files
    Debug.Print oFile.Path
Next oFile

Debug.Print "The end"
End Sub
Sub PDF_to_Txt_Part_02_Convert_pdf_to_jpg()

Dim FSO As Scripting.FileSystemObject
Dim oFolderPDF As Scripting.Folder
Dim oFile As Scripting.File
Dim sFolderPDF As String
Dim sMagick As String: sMagick = """" & "C:\Program Files\ImageMagick-7.0.11-Q16-HDRI\magick.exe" & """"

Set FSO = CreateObject("Scripting.FileSystemObject")
sFolderPDF = "C:\Users\logistics.rs\Desktop\PDFs\"
Set oFolderPDF = FSO.GetFolder(sFolderPDF)

For Each oFile In oFolderPDF.Files
    'Debug.Print oFile.Path
    'Debug.Print sMagick & " " & """" & oFile.Path & """" & " " & """" & Left(oFile.Path, Len(oFile.Path) - 3) & "jpg" & """"
    Call Shell(sMagick & " " & """" & oFile.Path & """" & " " & """" & Left(oFile.Path, Len(oFile.Path) - 3) & "jpg" & """", vbNormalFocus)   'Run Magick: PDF to JPG
    RetVal = Shell("cmd.exe /c convert """ & sLocalFile & """ """ & sLocalFile & ".jpg""", vbMaximizedFocus)
Next oFile

Debug.Print "The end"
End Sub
Sub PDF_to_Txt_Part_03_Read_text_from_jpg()

Dim FSO As Scripting.FileSystemObject
Dim oFolderPDF As Scripting.Folder
Dim oFile As Scripting.File
Dim sFolderPDF As String
Dim sMagick As String: sMagick = """" & "C:\Program Files\ImageMagick-7.0.11-Q16-HDRI\magick.exe" & """"
Dim sTesseract As String: sTesseract = """" & "C:\Program Files\Tesseract-OCR\tesseract.exe" & """"

Set FSO = CreateObject("Scripting.FileSystemObject")
sFolderPDF = "C:\Users\logistics.rs\Desktop\PDFs"
Set oFolderPDF = FSO.GetFolder(sFolderPDF)

'Convert from PDF to JPG
For Each oFile In oFolderPDF.Files
    'Debug.Print oFile.Path
    Debug.Print sMagick & " """ & oFile.Path & """ """ & Left(oFile.Path, Len(oFile.Path) - 3) & "jpg" & """"
    Call Shell(sMagick & " """ & oFile.Path & """ """ & Left(oFile.Path, Len(oFile.Path) - 3) & "jpg" & """", vbNormalFocus)     'Run Magick: PDF to JPG
Next oFile

'Something needs to be added to wait before the conversion to finish

'Get text from JPG
For Each oFile In oFolderPDF.Files
    Debug.Print oFile.Type
    If oFile.Type = "JPG File" Then
        Debug.Print oFile.Name
        Debug.Print sTesseract & " """ & oFile.Path & """ """ & Left(oFile.Path, Len(oFile.Path) - 4) & """"
        Call Shell(sTesseract & " """ & oFile.Path & """ """ & Left(oFile.Path, Len(oFile.Path) - 4) & """", vbNormalFocus)
    End If
Next oFile

Debug.Print "The end"
End Sub
Sub PDF_to_Txt_Part_04_Wait_for_Magick_and_Tesseract_to_finish()

Dim FSO As Scripting.FileSystemObject
Dim oFolderPDF As Scripting.Folder
Dim oFile As Scripting.File
Dim sFolderPDF As String
Dim sMagickQuoted As String: sMagickQuoted = """" & "C:\Program Files\ImageMagick-7.0.11-Q16-HDRI\magick.exe" & """"
Dim sMagick As String: sMagick = "C:\Program Files\ImageMagick-7.0.11-Q16-HDRI\magick.exe"
Dim sTesseractQuoted As String: sTesseractQuoted = """" & "C:\Program Files\Tesseract-OCR\tesseract.exe" & """"
Dim sTesseract As String: sTesseract = "C:\Program Files\Tesseract-OCR\tesseract.exe"

Set FSO = CreateObject("Scripting.FileSystemObject")
sFolderPDF = "C:\Users\logistics.rs\Desktop\PDFs\"
Set oFolderPDF = FSO.GetFolder(sFolderPDF)

'Convert from PDF to JPG
For Each oFile In oFolderPDF.Files
    'Debug.Print oFile.Path
    Debug.Print sMagickQuoted & " """ & oFile.Path & """ """ & Left(oFile.Path, Len(oFile.Path) - 3) & "jpg" & """"
    Call Shell(sMagickQuoted & " """ & oFile.Path & """ """ & Left(oFile.Path, Len(oFile.Path) - 3) & "jpg" & """", vbNormalFocus)     'Run Magick: PDF to JPG
Next oFile
If app_finished(sMagick) Then
    Debug.Print "OK"
Else
    Debug.Print "KO"
End If
    
'Get text from JPG
For Each oFile In oFolderPDF.Files
    Debug.Print oFile.Type
    If oFile.Type = "JPG File" Then
        Debug.Print oFile.Name
        Debug.Print sTesseractQuoted & " """ & oFile.Path & """ """ & Left(oFile.Path, Len(oFile.Path) - 4) & """"
        Call Shell(sTesseractQuoted & " """ & oFile.Path & """ """ & Left(oFile.Path, Len(oFile.Path) - 4) & """", vbNormalFocus)
    End If
Next oFile
If app_finished(sTesseract) Then
    Debug.Print "OK"
Else
    Debug.Print "KO"
End If

Debug.Print "The end"
End Sub
Function app_finished(sName As String) As Boolean

Dim sAPI As String
Dim i As Integer

sAPI = FindWindow(vbNullString, sName)
i = 0
Do Until sAPI <> "0"  'Catch the screen
    Sleep 50
    sAPI = FindWindow(vbNullString, sName)
    i = i + 1
Loop
If i >= 50 Then
    Exit Function
End If
i = 0
Do Until sAPI = "0" 'loop until the screen is away
    Sleep 500
    sAPI = FindWindow(vbNullString, sName)
    i = i + 1
Loop
If i >= 50 Then
    Exit Function
End If

app_finished = True

End Function
Sub PDF_to_Txt_Part_05_Combining_all_text_files_into_1()

Dim FSO As Scripting.FileSystemObject
Dim oFolderPDF As Scripting.Folder
Dim oFile As Scripting.File
Dim oOutput As Scripting.TextStream
Dim oInput As Scripting.TextStream
Dim sFolderPDF As String
Dim sMagickQuoted As String: sMagickQuoted = """" & "C:\Program Files\ImageMagick-7.0.11-Q16-HDRI\magick.exe" & """"
Dim sMagick As String: sMagick = "C:\Program Files\ImageMagick-7.0.11-Q16-HDRI\magick.exe"
Dim sTesseractQuoted As String: sTesseractQuoted = """" & "C:\Program Files\Tesseract-OCR\tesseract.exe" & """"
Dim sTesseract As String: sTesseract = "C:\Program Files\Tesseract-OCR\tesseract.exe"
Dim ws As Worksheet: Set ws = ThisWorkbook.Worksheets("PDFs")
Dim iRow As Integer: iRow = 1
Dim sPDFExcel As String
Dim sPDFFolder As String
Dim iPageCounter As Integer: iPageCounter = 1

Set FSO = CreateObject("Scripting.FileSystemObject")
sFolderPDF = "C:\Users\logistics.rs\Desktop\PDFs\"
Set oFolderPDF = FSO.GetFolder(sFolderPDF)

'Convert from PDF to JPG
For Each oFile In oFolderPDF.Files
    'Debug.Print oFile.Path
    Debug.Print sMagickQuoted & " """ & oFile.Path & """ """ & Left(oFile.Path, Len(oFile.Path) - 3) & "jpg" & """"
    If oFile.Type = "PDF File" Then
        Call Shell(sMagickQuoted & " """ & oFile.Path & """ """ & Left(oFile.Path, Len(oFile.Path) - 3) & "jpg" & """", vbNormalFocus)     'Run Magick: PDF to JPG
        ws.Cells(iRow, 1) = oFile.Name
        iRow = iRow + 1
    End If
Next oFile
If app_finished(sMagick) Then
    Debug.Print "OK"
Else
    Debug.Print "KO"
End If
    
'Get text from JPG
For Each oFile In oFolderPDF.Files
    Debug.Print oFile.Type
    If oFile.Type = "JPG File" Then
        Debug.Print oFile.Name
        Debug.Print sTesseractQuoted & " """ & oFile.Path & """ """ & Left(oFile.Path, Len(oFile.Path) - 4) & """"
        Call Shell(sTesseractQuoted & " """ & oFile.Path & """ """ & Left(oFile.Path, Len(oFile.Path) - 4) & """", vbNormalFocus)
    End If
Next oFile
If app_finished(sTesseract) Then
    Debug.Print "OK"
Else
    Debug.Print "KO"
End If

'Put all the txt files into 1
iRow = 1
Do Until ws.Cells(iRow, 1) = vbNullString
    For Each oFile In oFolderPDF.Files
        Debug.Print oFile.Name
        sPDFExcel = Left(ws.Cells(iRow, 1), Len(ws.Cells(iRow, 1)) - 4)
        sPDFFolder = Left(oFile.Name, Len(ws.Cells(iRow, 1)) - 4)
        Debug.Print sPDFExcel
        Debug.Print sPDFFolder
        If sPDFExcel = sPDFFolder Then
            If oFile.Type <> "PDF File" Then
                If oFile.Type = "Text Document" Then
                    Set oInput = FSO.OpenTextFile(oFile.Path, ForReading)
                    If oOutput Is Nothing Then
                        Set oOutput = FSO.CreateTextFile(oFile.ParentFolder & "/" & sPDFExcel & "_FULL.txt", True)
                    End If
                    oOutput.WriteLine (oInput.ReadAll)
                    oOutput.WriteLine (" _-_-_-_-_-_-_-_-_- Page " & iPageCounter & " _-_-_-_-_-_-_-_-_- ")
                    iPageCounter = iPageCounter + 1
                    oInput.Close
                End If
                oFile.Delete
            End If
        End If
    Next oFile
    iRow = iRow + 1
    iPageCounter = 1
    oOutput.Close
    Set oOutput = Nothing
Loop

Debug.Print "The end"
End Sub

Thank you !

P.S. Programs tesseract and magick are installed and manualy working fine.
 

Excel Facts

Which came first: VisiCalc or Lotus 1-2-3?
Dan Bricklin and Bob Frankston debuted VisiCalc in 1979 as a Visible Calculator. Lotus 1-2-3 debuted in the early 1980's, from Mitch Kapor.

johnnyL

Well-known Member
Joined
Nov 7, 2011
Messages
1,295
Office Version
  1. 2013
  2. 2007
Platform
  1. Windows
Shell is used to open programs so you have to tell it to open a CMD prompt and then run the appropriate command, for example:

VBA Code:
RetVal = Shell("cmd.exe /c convert.exe """ & sLocalFile & """ """ & sLocalFile & ".jpg""")
 

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