VBA Tesseract and Magick from PDF>JPG>Text

D

drag1c

Board Regular
Joined
Aug 7, 2019
Messages
97
Office Version
  1. 2016
  2. 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.
 

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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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