| Author |
 Topic  |
|
|
jrpcguru
USA
254 Posts |
 Posted - Aug 29 2017 : 16:08:32
|
I can use the following sample code to save metadata into a .PDF file that would normally save into IPTC data for a .JPG or .TIF:
ImageEnMView1.MIO.ParamS[0].PDF_Title :=IPTCTitle.Text; //title
ImageEnMView1.MIO.ParamS[0].PDF_Creator :=IPTCauthor.Text; //location
ImageEnMView1.MIO.ParamS[0].PDF_Author :=IPTCSource.Text; //source
ImageEnMView1.MIO.ParamS[0].PDF_Subject :=IPTCauthorTitle.Text; //date
ImageEnMView1.MIO.ParamS[0].PDF_Keywords :=IPTCCaption.Text; //description
I have not found a way of reading the metadata when reloading a PDF file using the MakeImage plugin. for example:
ImageEnMView1.mio.Params[idx].PDF_Title is blank, even if Adobe Reader can display the matching metadata.
J.R. |
|
|
xequte
38182 Posts |
Posted - Aug 29 2017 : 17:18:38
|
Hi JR
Yes, the WPDF Plug-In does not fill those fields. You might want to make a request to Julian.
Nigel
Xequte Software
www.xequte.com
nigel@xequte.com
|
 |
|
|
jrpcguru
USA
254 Posts |
Posted - Sep 20 2017 : 16:15:23
|
I still haven't been given permission to join the WPCubed forum. Thanks to your assistance, I've made good progress on PDF saving and reloading. I have used a hexeditor to try to figure out the format of PDF metadata and found quite a bit of variation. I offer the following code for reading PDF metadata. I'm hoping others will benefit from it and perhaps even contribute improvements. It does not read all types of metadata, but covered a pretty good sampling of files. It could be modified to limit it to only reading the metadata format used by ImageEn, since that appears to be consistent for at least several years.
function ExtractPDFMetadata(const aPDFFileName: TFileName; out outPDF_Title : string;
out outPDF_Author:string; out outPDF_Subject:string; out outPDF_Keywords: string;
out outPDF_Creator : string; out outPDF_Producer:string): UTF8String;
//modified from StackOverFlow: https://stackoverflow.com/questions/7130287/easiest-way-to-read-pdf-a-metadata-from-a-delphi-app?rq=1
//Does not read compressed or encrypted PDF metadata
//Does not parse metadata stored as XMP - very little of this was found. does return the Producer value if XMP is found
var tmp: RawByteString;
i, j, k: integer;
sMsg : string;
iStartingPoint : integer;
//==============================================
function subHexToString(H: String): String;
//only a few samples needed this.
var I: Integer;
begin
Result:= '';
for I := 1 to length (H) div 2 do
Result:= Result+Char(StrToInt('$'+Copy(H,(I-1)*2+1,2)));
end;
function subRemoveNull ( str : string) : string;
//only a few samples needed this
var
n : integer;
begin
n := 1;
while n <= Length(str) do
begin
if str[n] = #0 then
begin
Delete(str, n, 1);
Continue;
end;
inc(n);
end;
result := str;
end;
//===============================================
function SubReadValue(inOpenTag : string; inCloseTag : string; inStartingPoint : integer) : string;
var
i, j: integer;
iTagStart : integer;
sRaw : RawByteString;
sResult : string;
begin
result := '';
if inStartingPoint > 0 then
inStartingPoint := inStartingPoint -1;
iTagStart := PosEx(inOpenTag,tmp, inStartingPoint);
if (iTagStart <> 0) then //find end tag
begin
j := iTagStart + Length(inOpenTag)-2 ; //starting point to read tag
i := PosEx(inCloseTag,tmp,j+1); //all these different tag formats have been seen in PDF files via HexEditor
if (i > 0) and (j > 0) then
begin
sRaw := AnsiMidStr(tmp,j+2,i-j -2);
sResult := AnsiLeftStr(sRaw,4);
if sResult = 'FEFF' then
begin
sRaw := AnsiMidStr(sRaw,5, length(sRaw));
sRaw := subHexToString(sRaw);
end
else
begin
sRaw := AnsiReplaceText(sRaw,#255,'');
sRaw := AnsiReplaceText(sRaw,#254,'');
end;
sResult := sRaw;
Result := subRemoveNull((sResult));
result := AnsiReplaceText(result,'\(','('); //fix code to differentiate actual ( from delimiter
result := AnsiReplaceText(result,'\)',')');
result := AnsiReplaceText(result,'\<','('); //fix code to differentiate actual < from delimiter
result := AnsiReplaceText(result,'\>',')');
end;
end;
end;
//===============================================
function SubFindProducer: string;
//search for XMP metadata
var
i, j: integer;
iTagStart : integer;
begin
result := '';
iTagStart := Pos('<pdf:Producer>',tmp);
if iTagStart > 0 then
begin
i := iTagStart;
while i <> 0 do
begin
i := PosEx('<pdf:Producer>',tmp, iTagStart + 1);
if i > 0 then
iTagStart := i
end;
end;
if (iTagStart <> 0) then
begin
i := PosEx('</pdf:Producer>',tmp, iTagStart + 1);
j := iTagStart + Length('<pdf:Producer>');
if (i > 0) and (j > 0) then
result := AnsiMidStr(tmp,j,i-j);
end;
end;
//===============================================
//===============================================
function SubFindStartingPoint(inOpenTag : string) : integer;
var
i: integer;
iTagStart : integer;
begin
result := 0;
iTagStart := Pos(inOpenTag,tmp);
if iTagStart > 0 then
begin
i := iTagStart;
while i <> 0 do //now search for additional metadata blocks
begin
i := PosEx(inOpenTag ,tmp, iTagStart + 1);
if i > 0 then
iTagStart := i ;
end;
end;
result := iTagStart;
end;
//===============================================
function subChooseTagFormat(inTagName : string; inStartingPoint : integer) : string;
var
iTagStart : integer;
iEndTag, j : integer;
sResult : RawByteString;
begin
sResult := SubReadValue(inTagName + '(' + #254+#255 + ' ', ')/', inStartingPoint); //Test each logical combination of delimiters
if sResult = '' then
sResult := SubReadValue(inTagName + '(' + #254+#255 + ' ', ')>', inStartingPoint); //Test each logical combination of delimiters
if sResult = '' then
sResult := SubReadValue(inTagName + '(', ')/', inStartingPoint); //Test each logical combination of delimiters
if sResult = '' then
sResult := SubReadValue(inTagName + '(', ') /', inStartingPoint);
if sResult = '' then
sResult := SubReadValue(inTagName + '(', ')' + #10 + '/', inStartingPoint);
if sResult = '' then
sResult := SubReadValue(inTagName + '(', ')' + #13 + '/', inStartingPoint);
if sResult = '' then
sResult := SubReadValue(inTagName + '(', ')', inStartingPoint);
if sResult = '' then
sResult := SubReadValue(inTagName + '(', ')>', inStartingPoint);
if sResult = '' then
sResult := SubReadValue(inTagName + ' (', ')' + #10 + '/', inStartingPoint);
if sResult = '' then
sResult := SubReadValue(inTagName + ' (', ')' + #13 + '/', inStartingPoint);
if sResult = '' then
sResult := SubReadValue(inTagName + ' (', ') /', inStartingPoint);
if sResult = '' then
sResult := SubReadValue(inTagName + ' (', ')', inStartingPoint);
if sResult = '' then
sResult := SubReadValue(inTagName + ' <', '>' + #13, inStartingPoint);
if sResult = '' then
sResult := SubReadValue(inTagName + ' <', '>', inStartingPoint);
if sResult <> '' then //some end tags do not match. Find the earliest end tag in Result and use it to extract correct value
begin
iEndTag := PosEx(')/',sResult,1);
if iEndTag > 0 then
sResult := AnsiMidStr(sResult,1,iEndTag - 1);
iEndTag := PosEx(') /',sResult,1);
if iEndTag > 0 then
sResult := AnsiMidStr(sResult,1,iEndTag - 1);
iEndTag := PosEx(')' + #10 + '/',sResult,1);
if iEndTag > 0 then
sResult := AnsiMidStr(sResult,1,iEndTag - 1);
iEndTag := PosEx(')' + #13 + '/',sResult,1);
if iEndTag > 0 then
sResult := AnsiMidStr(sResult,1,iEndTag - 1);
iEndTag := PosEx(') /',sResult,1);
if iEndTag > 0 then
sResult := AnsiMidStr(sResult,1,iEndTag - 1);
iEndTag := PosEx(')' + #13 + '>',sResult,1);
if iEndTag > 0 then
sResult := AnsiMidStr(sResult,1,iEndTag - 1);
iEndTag := PosEx('>' + #13,sResult,1);
if iEndTag > 0 then
sResult := AnsiMidStr(sResult,1,iEndTag - 1);
iEndTag := PosEx('>' ,sResult,1);
if iEndTag > 0 then
sResult := AnsiMidStr(sResult,1,iEndTag - 1);
Result := sResult;
end;
end;
//===============================================
begin //ExtractPDFMetadata()
with TFileStream.Create(aPDFFileName,fmOpenRead) do
try
SetLength(tmp,Size);
Read(tmp[1],Size);
finally
Free;
end;
result := '';
// tmp := AnsiRightStr(tmp,10000); //some metadata turns up at beginning of file so can't shorten the string
iStartingPoint := SubFindStartingPoint('<x:xmpmeta');
if iStartingPoint > 0 then
begin
outPDF_Producer := SubFindProducer; //only report Producer value from XMP.
exit;
end;
iStartingPoint := SubFindStartingPoint('/Title');
if iStartingPoint = 0 then iStartingPoint := Length(tmp); //try to find things before the EOF
i := SubFindStartingPoint('/Author');
if (i > 0) and (i < iStartingPoint) then iStartingPoint := i;
i := SubFindStartingPoint('/Subject');
if (i > 0) and (i < iStartingPoint) then iStartingPoint := i;
i := SubFindStartingPoint('/Keywords');
if (i > 0) and (i < iStartingPoint) then iStartingPoint := i;
i := SubFindStartingPoint('/Creator');
if (i > 0) and (i < iStartingPoint) then iStartingPoint := i;
i := SubFindStartingPoint('/Producer');
if (i > 0) and (i < iStartingPoint) then iStartingPoint := i;
if iStartingPoint = Length(tmp) then
exit;
iStartingPoint := iStartingPoint -1; //start looking just before first tag
outPDF_Title := subChooseTagFormat('/Title', iStartingPoint); //Test each logical combination of delimiters
outPDF_Author := subChooseTagFormat('/Author', iStartingPoint); //Test each logical combination of delimiters
outPDF_Subject := subChooseTagFormat('/Subject', iStartingPoint); //Test each logical combination of delimiters
outPDF_Keywords := subChooseTagFormat('/Keywords', iStartingPoint); //Test each logical combination of delimiters
outPDF_Creator := subChooseTagFormat('/Creator', iStartingPoint); //Test each logical combination of delimiters
outPDF_Producer := subChooseTagFormat('/Producer', iStartingPoint); //Test each logical combination of delimiters
result := 'Title = ' + outPDF_Title + sLineBreak + 'Author = ' + outPDF_Author + sLineBreak +
'Subject = ' + outPDF_Subject + sLineBreak + 'Keywords = ' + outPDF_Keywords + slineBreak +
'Creator = ' + outPDF_Creator + sLineBreak + 'Producer = ' + outPDF_Producer;
end;
Hopefully this is helpful to someone.
J.R. |
|
|
|
jrpcguru
USA
254 Posts |
Posted - Jan 04 2018 : 14:10:33
|
I have now managed to improve the PDF metadata code that I offered back in Sept. It now avoids Out of Memory errors for large files. It translates several more formats of metadata, including what is probably a crude XML translation. I don't have many samples of XML metadata to test with. Judging from the lack of response to my original posts, it would seem that reading metadata is not a high priority for your users.
function ExtractPDFMetadata(const inPDFFileName: TFileName; out outPDF_Title : string;
out outPDF_Author:string; out outPDF_Subject:string; out outPDF_Keywords: string;
out outPDF_Creator : string; out outPDF_Producer:string): UTF8String;
//modified from StackOverFlow: https://stackoverflow.com/questions/7130287/easiest-way-to-read-pdf-a-metadata-from-a-delphi-app?rq=1
//Does not read compressed or encrypted PDF metadata
//Parses some metadata stored as XMP - very little of this was found to test with.
var
tmp: RawByteString;
iReadStart : Int64;
i, j: integer;
iStartingPoint : integer;
sXMLProducer : string;
iRetryCount : integer;
iBufferSize : integer;
sCaption : string;
//==============================================
function subHexToString(H: String): String;
//only a few samples needed this.
var
I: Integer;
j: integer;
sTemp : string;
begin
Result:= '';
try
for I := 1 to length (H) div 2 do
begin
sTemp := Copy(H,(I-1)*2+1,2);
j := StrToInt('$'+ sTemp);
result := Result + Char(j);
end;
except
// result := ''; //retain current data up until error
end;
end;
function subRemoveNull ( str : string) : string;
//only a few samples needed this
var
n : integer;
begin
n := 1;
while n <= Length(str) do
begin
if str[n] = #0 then
begin
Delete(str, n, 1);
Continue;
end;
inc(n);
end;
result := str;
end;
function subTranslatePrimo(str : string) : string;
//sample from PrimoPDF printer driver
begin
result := str;
if PosEx('\376\377\000',str, 1) > 0 then
begin
if AnsiLeftStr(str,12) = '\376\377\000' then
begin
str := AnsiMidStr(str,13, length(str));
result := AnsiReplaceText(str,'\000',''); //remove \000
end;
end;
end;
function SubGetEndTag(inStart : integer) : integer;
var
iEndTag : integer;
begin
result := Length(tmp);
iEndTag := PosEx('>' + #10,tmp,inStart);
if (iEndTag > 0) and (iEndTag < result) then
Result := iEndTag;
iEndTag := PosEx(')/',tmp,inStart);
if (iEndTag > 0) and (iEndTag < result) then
Result := iEndTag;
iEndTag := PosEx(') /',tmp,inStart);
if (iEndTag > 0) and (iEndTag < result) then
Result := iEndTag;
iEndTag := PosEx(')' + #10 + '/',tmp,inStart);
if (iEndTag > 0) and (iEndTag < result) then
Result := iEndTag;
iEndTag := PosEx(')' + #13 + '/',tmp,inStart);
if (iEndTag > 0) and (iEndTag < result) then
Result := iEndTag;
iEndTag := PosEx(') /',tmp,inStart);
if (iEndTag > 0) and (iEndTag < result) then
Result := iEndTag;
iEndTag := PosEx(')>',tmp,inStart);
if (iEndTag > 0) and (iEndTag < result) then
Result := iEndTag;
iEndTag := PosEx(')' + #13 + '>',tmp,inStart);
if (iEndTag > 0) and (iEndTag < result) then
Result := iEndTag;
iEndTag := PosEx('>' + #13,tmp,inStart);
if (iEndTag > 0) and (iEndTag < result) then
Result := iEndTag;
iEndTag := PosEx(')' + #10,tmp,inStart);
if (iEndTag > 0) and (iEndTag < result) then
Result := iEndTag;
end;
//===============================================
function SubReadValue(inOpenTag : string; inStartingPoint : integer) : string;
var
i, j: integer;
iTagStart : integer;
sRaw : RawByteString;
sResult : string;
begin
result := '';
if inStartingPoint > 0 then
inStartingPoint := inStartingPoint -1;
iTagStart := PosEx(inOpenTag,tmp, inStartingPoint);
if (iTagStart <> 0) then //find end tag
begin
j := iTagStart + Length(inOpenTag)-2 ; //starting point to read tag
i := SubGetEndTag(j+1);
if (i > 0) and (j > 0) then
begin
sRaw := AnsiMidStr(tmp,j+2,i-j -2);
sResult := AnsiLeftStr(sRaw,4);
if sResult = 'FEFF' then
begin
sRaw := AnsiMidStr(sRaw,5, length(sRaw));
sRaw := subHexToString(sRaw);
end
else
begin
sRaw := AnsiReplaceText(sRaw,#255,'');
sRaw := AnsiReplaceText(sRaw,#254,'');
end;
sResult := sRaw;
Result := subRemoveNull((sResult));
result := subTranslatePrimo(result);
end;
end;
end;
//===============================================
//===============================================
//===============================================
function SubFindXMLdata(inStartTag : string; inStopTag : string; inDataToSearch : string) : string;
//search for XML metadata within inDataToSearch data from FileStream
//start by searching inDataToSearch = tmp, if XML found then use it again with just the XMP data as the input
var
i, j: integer;
iTagStart : integer;
begin
result := '';
i := PosEx(inStartTag,inDataToSearch, 1); //find first occurrence of starting tag
if i > 0 then
iTagStart := i ;
if iTagStart > 0 then //now see if there are any more of this starting tag
begin
i := iTagStart;
while i <> 0 do
begin
i := PosEx(inStartTag,inDataToSearch, iTagStart + 1);
if i > 0 then
iTagStart := i
end;
end;
if (iTagStart <> 0) then
begin
i := PosEx(inStopTag,inDataToSearch, iTagStart + 1);
j := iTagStart + Length(inStartTag);
if (i > 0) and (j > 0) then
result := AnsiMidStr(inDataToSearch,j,i-j);
end;
if (result <> '') then // remove XML tags //so far the only tags I have seen in files
begin
result := StringReplace(result,'<rdf:Alt>','',[rfReplaceAll,rfIgnoreCase]); //restore XMP representations of >
result := StringReplace(result,'</rdf:Alt>','',[rfReplaceAll,rfIgnoreCase]); //restore XMP representations of >
result := StringReplace(result,'<rdf:li>','',[rfReplaceAll,rfIgnoreCase]); //restore XMP representations of >
result := StringReplace(result,'<rdf:li/>','',[rfReplaceAll,rfIgnoreCase]); //restore XMP representations of >
result := StringReplace(result,'<rdf:li xml:lang="x-default">','',[rfReplaceAll,rfIgnoreCase]); //restore XMP representations of >
result := StringReplace(result,'<rdf:li xml:lang="x-default"/>','',[rfReplaceAll,rfIgnoreCase]); //restore XMP representations of >
result := StringReplace(result,'</rdf:li>','',[rfReplaceAll,rfIgnoreCase]); //restore XMP representations of >
result := StringReplace(result,'<rdf:Bag>','',[rfReplaceAll,rfIgnoreCase]); //restore XMP representations of >
result := StringReplace(result,'</rdf:Bag>','',[rfReplaceAll,rfIgnoreCase]); //restore XMP representations of >
result := StringReplace(result,'<rdf:Seq>','',[rfReplaceAll,rfIgnoreCase]); //restore XMP representations of >
result := StringReplace(result,'</rdf:Seq>','',[rfReplaceAll,rfIgnoreCase]); //restore XMP representations of >
result := trim(result);
end;
end;
//===============================================
//===============================================
function SubFindStartingPoint(inOpenTag : string) : integer;
var
i: integer;
iTagStart : integer;
begin
result := 0;
iTagStart := Pos(inOpenTag,tmp);
if iTagStart > 0 then
begin
i := iTagStart;
while i <> 0 do //now search for additional metadata blocks, selecting the last one
begin
i := PosEx(inOpenTag ,tmp, iTagStart + 1);
if i > 0 then
iTagStart := i ;
end;
end;
result := iTagStart;
end;
//===============================================
function subChooseTagFormat(inTagName : string; inStartingPoint : integer) : string;
var
iTagStart : integer;
iEndTag, j : integer;
sResult : RawByteString;
begin
// sResult := SubReadValue(inTagName + '(' + #254+#255 + ' ', ')/', inStartingPoint); //Test each logical combination of delimiters
sResult := SubReadValue(inTagName + '(' + #254+#255 + #0, inStartingPoint); //Test each logical combination of delimiters
if sResult = '' then
sResult := SubReadValue(inTagName + ' <' + #254+#255 , inStartingPoint); //Test each logical combination of delimiters
if sResult = '' then
sResult := SubReadValue(inTagName + '(' + #254+#255 + ' ', inStartingPoint); //Test each logical combination of delimiters
if sResult = '' then
sResult := SubReadValue(inTagName + ' <', inStartingPoint);
if sResult = '' then
sResult := SubReadValue(inTagName + '<', inStartingPoint); //Test each logical combination of delimiters
if sResult = '' then
sResult := SubReadValue(inTagName + ' (', inStartingPoint);
if sResult = '' then
sResult := SubReadValue(inTagName + '(', inStartingPoint); //Test each logical combination of delimiters
Result := sResult;
//ImageEn converts ( to \( and ) to \) so we need to convert back
result := AnsiReplaceText(result,'\(','('); //fix code to differentiate actual ( from delimiter
result := AnsiReplaceText(result,'\)',')');
result := AnsiReplaceText(result,'\\','\'); //fix code to differentiate actual \ from delimiter
end;
function subReadSnagItStyleTags(inStartingPoint : integer; inTag : string) : string;
var
sDataNumber : string;
sTemp : string;
I,J : integer;
begin
result := '';
I := PosEx(inTag ,tmp, inStartingPoint);
if I > 0 then
begin
sDataNumber := AnsiMidStr(tmp,I + length(inTag) + 1,3);
sDataNumber := trim(sDataNumber); //may be 2 or 3 character code
sDataNumber := sDataNumber + ' 0 obj' + #13 + '(';
sTemp := AnsiMidStr(tmp,I,length(Tmp));
end;
I := PosEx(sDataNumber,sTemp, length(inTag) + 6);
I := I + length(sDataNumber);
if I > 0 then
begin
J := PosEx(')' + #13 + 'endobj',sTemp, I);
result := AnsiMidStr(sTemp, I , J - I);
end;
end;
Procedure subLoopThruMetaData;
var
sXMLData : string;
begin
i := SubFindStartingPoint('/Title'); //search in Tmp
if (i > 0) then
outPDF_Title := subChooseTagFormat('/Title', I);
i := SubFindStartingPoint('/Author');
if (i > 0) then
outPDF_Author := subChooseTagFormat('/Author', I);
i := SubFindStartingPoint('/Subject');
if (i > 0) then
outPDF_Subject := subChooseTagFormat('/Subject', I);
i := SubFindStartingPoint('/Keywords');
if (i > 0) then
outPDF_Keywords := subChooseTagFormat('/Keywords', I);
i := SubFindStartingPoint('/Creator');
if (i > 0) then
outPDF_Creator := subChooseTagFormat('/Creator', I);
i := SubFindStartingPoint('/Producer');
if (i > 0) then
outPDF_Producer := subChooseTagFormat('/Producer', I)
else
begin
sXMLData := SubFindXMLdata('<x:xmpmeta', '</x:xmpmeta' ,Tmp);
if sXMLData <> '' then
begin
sXMLProducer := SubFindXMLdata('<pdf:Producer>', '</pdf:Producer>', sXMLData);
outPDF_Producer := sXMLProducer;
if outPDF_Title = '' then
outPDF_Title := SubFindXMLdata('<dc:title>', '</dc:title>', sXMLData);
if outPDF_Author = '' then
outPDF_Author := SubFindXMLdata('<dc:creator>', '</dc:creator>', sXMLData);
if outPDF_Subject = '' then
outPDF_Subject := SubFindXMLdata('<dc:description>', '</dc:description>', sXMLData);
if outPDF_Creator = '' then
outPDF_Creator := SubFindXMLdata('<xap:CreatorTool>', '</xap:CreatorTool>', sXMLData);
if outPDF_Creator = '' then
outPDF_Creator := SubFindXMLdata('<xmp:CreatorTool>', '</xmp:CreatorTool>', sXMLData);
if outPDF_Keywords = '' then
outPDF_Keywords := SubFindXMLdata('<pdf:Keywords>', '</pdf:Keywords>', sXMLData);
// if (trim(outPDF_Title) + trim(outPDF_Author) + trim(outPDF_Subject) + trim(outPDF_Keywords) +
// trim(outPDF_Creator)) <> '' then
// outPDF_Producer := outPDF_Producer + ' - XML Metadata found';
end;
end;
if (trim(outPDF_Title) + trim(outPDF_Author) + trim(outPDF_Subject) + trim(outPDF_Keywords) +
trim(outPDF_Creator) + trim(outPDF_Producer) = '' ) then //see if it follows SnagIt format
begin
i := SubFindStartingPoint('<</Author');
outPDF_Producer := subReadSnagItStyleTags(I,'/Producer');
outPDF_Title := subReadSnagItStyleTags(I,'/Title');
outPDF_Author := subReadSnagItStyleTags(I,'/Author');
outPDF_Subject := subReadSnagItStyleTags(I,'/Subject');
outPDF_Keywords := subReadSnagItStyleTags(I,'/Keywords');
outPDF_Creator := subReadSnagItStyleTags(I,'/Creator');//didn't find this in my samples
end;
if (trim(outPDF_Title) + trim(outPDF_Author) + trim(outPDF_Subject) + trim(outPDF_Keywords) +
trim(outPDF_Creator) = '') then //+ trim(outPDF_Producer) = '' )
begin
iReadStart := iReadStart - (1024*190); //allow overlap with prior read
if iReadStart < 1 then
begin
iBufferSize := iBufferSize + iReadStart - 1; //only the remaing file to search
iReadStart := 1;
end;
end;
end;
//===============================================
begin //ExtractPDFMetadata()
iBufferSize := 1024*200;
try
with TFileStream.Create(inPDFFileName,fmOpenRead or fmShareDenyNone) do
try
iReadStart := Size - iBufferSize;
if iReadStart <=0 then
begin
iReadStart := 1; //buffer is bigger than the file
iBufferSize := size;
end;
while iReadStart >= 1 do
begin
Seek(iReadStart, soFromBeginning);
SetLength(tmp,iBufferSize);
Read(tmp[1],iBufferSize);
subLoopThruMetaData;
if (trim(outPDF_Title) + trim(outPDF_Author) + trim(outPDF_Subject) + trim(outPDF_Keywords) +
trim(outPDF_Creator) + trim(outPDF_Producer) <> '' ) then
break;
if (iReadStart = 1) then
begin
Seek(iReadStart, soFromBeginning);
SetLength(tmp,iBufferSize);
Read(tmp[1],iBufferSize);
subLoopThruMetaData;
break;
end;
end;
finally
Free;
end;
except
begin
outPDF_Title := 'Unable to read Title';
outPDF_Author := 'Unable to read Source';
outPDF_Subject := 'Unable to read Date';
outPDF_Keywords := 'Unable to read Description';
outPDF_Creator := 'Unable to read Location';
outPDF_Producer := 'Unable to read Software Name';
exit;
end;
end;
result := '';
result := '';
result := 'Title = ' + outPDF_Title + sLineBreak + 'Author = ' + outPDF_Author + sLineBreak +
'Subject = ' + outPDF_Subject + sLineBreak + 'Keywords = ' + outPDF_Keywords + slineBreak +
'Creator = ' + outPDF_Creator + sLineBreak + 'Producer = ' + outPDF_Producer;
end;
J.R. |
|
|
|
xequte
38182 Posts |
Posted - Jan 04 2018 : 20:45:17
|
Thanks JR,
I will test it out. You may not have got a lot of responses, but there were a lot of reads of your post.
Nigel
Xequte Software
www.imageen.com
|
|
|
| |
Topic |
|
|
|
Search
WPCubed MakeImage plug in
