freemanirl 0 Newbie Poster

I'm writing this in VB.NET, so I figured I'd post here. So, I'm writing a program to convert some pdfs to jpegs. This is all well and good, and the program seems to work well for the most part. Unfortunately, I've come across a bit of a problem. The pdfs that I'm working with have the occasional dingbat on them. Ghostscript wants to load a font for this, but it's not loaded. I've been trying to read up on a way to replace the font directly through a parameter, but I haven't found much. What I have found relates to the exe, and I'm using the DLL. So, I don't have the luxury of having the scripts available. I've tried putting the cidfmap file in the same folder with the dll, but that didn't have any success.

error:

Revision = 900
RevisionDate = 20100914
Product = GPL Ghostscript
Copyright = Copyright (C) 2010 Artifex Software, Inc. All rights reserved.
GPL Ghostscript 9.00 (2010-09-14)
Copyright (C) 2010 Artifex Software, Inc. All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Processing pages 1 through 5.
Page 1
Page 2
Can't find CID font "ZapfDingbats".
Substituting CID font /Adobe-Identity for /ZapfDingbats, see doc/Use.htm#CIDFont
Substitution.
The substitute CID font "Adobe-Identity" is not provided either. Will exit with
error.
Error: /undefined in findresource
Operand stack:
--dict:11/20(L)-- G27 1 --dict:5/5(L)-- --dict:5/5(L)-- ZapfDingbat
s-Identity-H --dict:10/12(ro)(G)-- --nostringval-- CIDFontObject --dict:
7/7(L)-- --dict:7/7(L)-- Adobe-Identity
Execution stack:
%interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-
- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- fa
lse 1 %stopped_push 1910 1 3 %oparray_pop 1909 1 3 %oparray_
pop 1893 1 3 %oparray_pop --nostringval-- --nostringval-- 3 1
5 --nostringval-- %for_pos_int_continue --nostringval-- --nostringval--
--nostringval-- --nostringval-- %array_continue --nostringval-- false
1 %stopped_push --nostringval-- %loop_continue --nostringval-- --nos
tringval-- --nostringval-- --nostringval-- --nostringval-- --nostringval
-- %array_continue --nostringval-- --nostringval-- --nostringval-- --n
ostringval-- --nostringval-- %loop_continue
Dictionary stack:
--dict:1158/1684(ro)(G)-- --dict:1/20(G)-- --dict:82/200(L)-- --dict:82
/200(L)-- --dict:108/127(ro)(G)-- --dict:293/300(ro)(G)-- --dict:23/30(L)-
- --dict:6/8(L)-- --dict:22/40(L)-- --dict:14/15(L)--
Current allocation mode is local
Last OS error: No such file or directory
GPL Ghostscript 9.00: Unrecoverable error, exit code 1

Program:

Option Explicit On

Imports System.Runtime.InteropServices
Imports System.IO.File

Module Module1

    Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByVal dest As IntPtr, ByVal source As IntPtr, ByVal bytes As Long)

    '------------------------------------------------
    'UDTs Start
    '------------------------------------------------
    <StructLayout(LayoutKind.Sequential)> Public Structure GS_Revision
        Public strProduct As IntPtr
        Public strCopyright As IntPtr
        Public intRevision As Integer
        Public intRevisionDate As Integer
    End Structure
    '------------------------------------------------
    'UDTs End
    '------------------------------------------------

    '------------------------------------------------
    'Callback Functions Start
    '------------------------------------------------
    'These are only required if you use gsapi_set_stdio
    Public Delegate Function StdioCallBack(ByVal handle As IntPtr, ByVal strptr As IntPtr, ByVal count As Integer) As Integer

    Public Function gsdll_stdin(ByVal intGSInstanceHandle As IntPtr, ByVal strz As IntPtr, ByVal intBytes As Integer) As Integer
        ' This is dumb code that reads one byte at a time
        ' Ghostscript doesn't mind this, it is just very slow
        If intBytes = 0 Then
            gsdll_stdin = 0
        Else
            Dim ich As Integer = Console.Read()
            If ich = -1 Then
                gsdll_stdin = 0 ' EOF
            Else
                Dim bch As Byte = ich
                Dim gcByte As GCHandle = GCHandle.Alloc(bch, GCHandleType.Pinned)
                Dim ptrByte As IntPtr = gcByte.AddrOfPinnedObject()
                CopyMemory(strz, ptrByte, 1)
                ptrByte = IntPtr.Zero
                gcByte.Free()
                gsdll_stdin = 1
            End If
        End If
    End Function

    Public Function gsdll_stdout(ByVal intGSInstanceHandle As IntPtr, ByVal strz As IntPtr, ByVal intBytes As Integer) As Integer
        ' If you can think of a more efficient method, please tell me!
        ' We need to convert from a byte buffer to a string
        ' First we create a byte array of the appropriate size
        Dim aByte(intBytes) As Byte
        ' Then we get the address of the byte array
        Dim gcByte As GCHandle = GCHandle.Alloc(aByte, GCHandleType.Pinned)
        Dim ptrByte As IntPtr = gcByte.AddrOfPinnedObject()
        ' Then we copy the buffer to the byte array
        CopyMemory(ptrByte, strz, intBytes)
        ' Release the address locking
        ptrByte = IntPtr.Zero
        gcByte.Free()
        ' Then we copy the byte array to a string, character by character
        Dim str As String = ""
        Dim i As Integer
        For i = 0 To intBytes - 1
            str = str + Chr(aByte(i))
        Next
        ' Finally we output the message
        Console.Write(str)
        gsdll_stdout = intBytes
    End Function

    Public Function gsdll_stderr(ByVal intGSInstanceHandle As IntPtr, ByVal strz As IntPtr, ByVal intBytes As Integer) As Integer
        gsdll_stderr = gsdll_stdout(intGSInstanceHandle, strz, intBytes)
    End Function
    '------------------------------------------------
    'Callback Functions End
    '------------------------------------------------

    '------------------------------------------------
    'API Calls Start
    '------------------------------------------------
    'Win32 API
    'GhostScript API
    '    Public Declare Function gsapi_revision Lib "gsdll32.dll" (ByVal pGSRevisionInfo As IntPtr, ByVal intLen As Integer) As Integer
    Public Declare Function gsapi_revision Lib "gsdll32.dll" (ByRef pGSRevisionInfo As GS_Revision, ByVal intLen As Integer) As Integer
    Public Declare Function gsapi_new_instance Lib "gsdll32.dll" (ByRef lngGSInstance As IntPtr, ByVal lngCallerHandle As IntPtr) As Integer
    Public Declare Function gsapi_set_stdio Lib "gsdll32.dll" (ByVal lngGSInstance As IntPtr, ByVal gsdll_stdin As StdioCallBack, ByVal gsdll_stdout As StdioCallBack, ByVal gsdll_stderr As StdioCallBack) As Integer
    Public Declare Sub gsapi_delete_instance Lib "gsdll32.dll" (ByVal lngGSInstance As IntPtr)
    Public Declare Function gsapi_init_with_args Lib "gsdll32.dll" (ByVal lngGSInstance As IntPtr, ByVal lngArgumentCount As Integer, ByVal lngArguments As IntPtr) As Integer
    Public Declare Function gsapi_run_file Lib "gsdll32.dll" (ByVal lngGSInstance As IntPtr, ByVal strFileName As String, ByVal intErrors As Integer, ByVal intExitCode As Integer) As Integer
    Public Declare Function gsapi_exit Lib "gsdll32.dll" (ByVal lngGSInstance As IntPtr) As Integer
    '------------------------------------------------
    'API Calls End
    '------------------------------------------------

    '------------------------------------------------
    'User Defined Functions Start
    '------------------------------------------------
    Public Function StringToAnsiZ(ByVal str As String) As Byte()
        ' Convert a Unicode string to a null terminated Ansi string for Ghostscript.
        ' The result is stored in a byte array.  Later you will need to convert
        ' this byte array to a pointer with GCHandle.Alloc(XXXX, GCHandleType.Pinned)
        ' and GSHandle.AddrOfPinnedObject()
        Dim intElementCount As Integer
        Dim intCounter As Integer
        Dim aAnsi() As Byte
        Dim bChar As Byte
        intElementCount = Len(str)
        ReDim aAnsi(intElementCount + 1)
        For intCounter = 0 To intElementCount - 1
            bChar = Asc(Mid(str, intCounter + 1, 1))
            aAnsi(intCounter) = bChar
        Next intCounter
        aAnsi(intElementCount) = 0
        StringToAnsiZ = aAnsi
    End Function

    Public Function AnsiZtoString(ByVal strz As IntPtr) As String
        ' We need to convert from a byte buffer to a string
        Dim byteCh(1) As Byte
        Dim bOK As Boolean = True
        Dim gcbyteCh As GCHandle = GCHandle.Alloc(byteCh, GCHandleType.Pinned)
        Dim ptrByte As IntPtr = gcbyteCh.AddrOfPinnedObject()
        Dim j As Integer = 0
        Dim str As String = ""
        While bOK
            ' This is how to do pointer arithmetic!
            Dim sPtr As New IntPtr(strz.ToInt64() + j)
            CopyMemory(ptrByte, sPtr, 1)
            If byteCh(0) = 0 Then
                bOK = False
            Else
                str = str + Chr(byteCh(0))
            End If
            j = j + 1
        End While
        AnsiZtoString = str
    End Function

    Public Function CheckRevision(ByVal intRevision As Integer) As Boolean
        ' Check revision number of Ghostscript
        Dim intReturn As Integer
        Dim udtGSRevInfo As GS_Revision
        Dim gcRevision As GCHandle
        gcRevision = GCHandle.Alloc(udtGSRevInfo, GCHandleType.Pinned)
        intReturn = gsapi_revision(udtGSRevInfo, 16)
        Console.WriteLine("Revision = " & udtGSRevInfo.intRevision)
        Console.WriteLine("RevisionDate = " & udtGSRevInfo.intRevisionDate)
        Console.WriteLine("Product = " & AnsiZtoString(udtGSRevInfo.strProduct))
        Console.WriteLine("Copyright = " & AnsiZtoString(udtGSRevInfo.strCopyright))

        If udtGSRevInfo.intRevision = intRevision Then
            CheckRevision = True
        Else
            CheckRevision = False
        End If
        gcRevision.Free()
    End Function

    Public Function CallGS(ByVal astrGSArgs() As String) As Boolean
        Dim intReturn As Integer
        Dim intGSInstanceHandle As IntPtr
        Dim aAnsiArgs() As Object
        Dim aPtrArgs() As IntPtr
        Dim aGCHandle() As GCHandle
        Dim intCounter As Integer
        Dim intElementCount As Integer
        'Dim iTemp As Integer
        Dim callerHandle As IntPtr
        Dim gchandleArgs As GCHandle
        Dim intptrArgs As IntPtr

        ' Print out the revision details.
        ' If we want to insist on a particular version of Ghostscript
        ' we should check the return value of CheckRevision().
        CheckRevision(704)

        ' Load Ghostscript and get the instance handle
        intReturn = gsapi_new_instance(intGSInstanceHandle, callerHandle)
        If (intReturn < 0) Then
            Return (False)
        End If

        ' Capture stdio
        Dim stdinCallback As StdioCallBack
        stdinCallback = AddressOf gsdll_stdin
        Dim stdoutCallback As StdioCallBack
        stdoutCallback = AddressOf gsdll_stdout
        Dim stderrCallback As StdioCallBack
        stderrCallback = AddressOf gsdll_stderr
        intReturn = gsapi_set_stdio(intGSInstanceHandle, stdinCallback, stdoutCallback, stderrCallback)

        If (intReturn >= 0) Then
            ' Convert the Unicode strings to null terminated ANSI byte arrays
            ' then get pointers to the byte arrays.
            intElementCount = UBound(astrGSArgs)
            ReDim aAnsiArgs(intElementCount)
            ReDim aPtrArgs(intElementCount)
            ReDim aGCHandle(intElementCount)
            For intCounter = 0 To intElementCount
                aAnsiArgs(intCounter) = StringToAnsiZ(astrGSArgs(intCounter))
                aGCHandle(intCounter) = GCHandle.Alloc(aAnsiArgs(intCounter), GCHandleType.Pinned)
                aPtrArgs(intCounter) = aGCHandle(intCounter).AddrOfPinnedObject()
            Next
            gchandleArgs = GCHandle.Alloc(aPtrArgs, GCHandleType.Pinned)
            intptrArgs = gchandleArgs.AddrOfPinnedObject()
            callerHandle = IntPtr.Zero

            intReturn = gsapi_init_with_args(intGSInstanceHandle, intElementCount + 1, intptrArgs)

            ' Release the pinned memory
            For intCounter = 0 To intElementCount
                aGCHandle(intCounter).Free()
            Next
            gchandleArgs.Free()

            ' Stop the Ghostscript interpreter
            gsapi_exit(intGSInstanceHandle)
        End If

        ' release the Ghostscript instance handle
        gsapi_delete_instance(intGSInstanceHandle)

        If (intReturn >= 0) Then
            CallGS = True
        Else
            CallGS = False
        End If

    End Function

    Private Function ConvertFile(ByVal path As String, ByVal destDir As String) As Boolean
        Dim output As Integer = 0
        Dim astrArgs(10) As String
        Dim fileName As String = ""
        Try
            Dim f As New IO.DirectoryInfo(destDir)
            If File.Exists(Path) And f.Exists Then
                If Path.Contains("\") Then
                    fileName = Path.Substring(Path.LastIndexOf("\") + 1, Path.Length - Path.LastIndexOf("\") - 1)
                Else
                    fileName = Path
                End If
                astrArgs(0) = "pdf2jpeg" 'The First Parameter is Ignored
                astrArgs(1) = "-dNOPAUSE"
                astrArgs(2) = "-dBATCH"
                astrArgs(3) = "-r300"
                astrArgs(4) = "-sDEVICE=jpeg"
                astrArgs(5) = "-sOutputFile=" & destDir & fileName.Substring(0, fileName.IndexOf(".")) & "-%03d.jpg"
                astrArgs(6) = path
                output = CallGS(astrArgs)
            End If
        Catch ex As Exception
            Console.WriteLine("Convert File: " & ex.Message)
        End Try
        Return output
    End Function

    Private Function InteractiveGS() As Boolean
        Dim astrArgs(2) As String
        astrArgs(0) = "gs" 'The First Parameter is Ignored
        astrArgs(1) = "-c"
        astrArgs(2) = "systemdict /start get exec"
        Return CallGS(astrArgs)
    End Function


    '------------------------------------------------
    'User Defined Functions End
    '------------------------------------------------

    Sub Main()
        'ConvertFile("E:\test\nps6902.pdf", "E:\test\images\")
        ConvertFile("E:\test\NTG_31_A.pdf", "E:\test\images\")
        'InteractiveGS()
        MsgBox("Done")
    End Sub

End Module

cidfmap:

/ZapfDingbats << /FileType /TrueType /Path (zapfdingbats.ttf) >> ;