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EMF Printer Spool File Viewer

, 23 Apr 2014 CPOL 441K 15.8K 82
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A viewer application for EMF format spool files.

What is an EMF spool file?

When an application sends pages to a printer they are held in an intermediary file which the application can write to and the printer driver can read from simultaneously. This speeds up the print process as control can return to the application before the printer has finished printing the document.

Usually this spool file is held in the raw printer page definition language (which could be PCL, PostScript or one of many other options) but in Windows NT, 2000, XP and 2003, it is possible to make the spooler use a different, more device independent format known as an EMF spool file.

The file layout of an EMF spool file is not officially documented by Microsoft, but this article reveals that it is a series of enhanced metafile records (one for each page) and a number of other record types which are specific to the business of printing these pages.

The EMF spool file record types

The spool file is composed of the following record types:

    Private Enum SpoolerRecordTypes
        SRT_EOF = &H0            ' // int32 zero
        SRT_RESERVED_1 = &H1     '*  1                               */
        SRT_FONTDATA = &H2       '  2 Font Data                      */
        SRT_DEVMODE = &H3        '  3 DevMode                        */
        SRT_FONT2 = &H4          '4 Font Data                        */
        SRT_RESERVED_5 = &H5     ' 5                                 */
        SRT_FONT_MM = &H6        ' 6 Font Data (Multiple Master)     */
        SRT_FONT_SUB1 = &H7      '   7 Font Data (SubsetFont 1)      */
        SRT_FONT_SUB2 = &H8      '   8 Font Data (SubsetFont 2)      
        SRT_RESERVED_9 = &H9
        SRT_UNKNOWN = &H10       ' // int unknown...
        SRT_RESERVED_A = &HA
        SRT_RESERVED_B = &HB
        SRT_PAGE = &HC           ' 12  Enhanced Meta File (EMF)       */
        SRT_EOPAGE1 = &HD        ' 13  EndOfPage                      */
        SRT_EOPAGE2 = &HE        ' 14  EndOfPage                      */
        SRT_EXT_FONT = &HF       ' 15  Ext Font Data                  */
        SRT_EXT_FONT2 = &H10     ' 16  Ext Font Data                  */
        SRT_EXT_FONT_MM = &H11   ' 17  Ext Font Data (Multiple Master)
        SRT_EXT_FONT_SUB1 = &H12 ' 18  Ext Font Data (SubsetFont 1)   */
        SRT_EXT_FONT_SUB2 = &H13 '* 19  Ext Font Data (SubsetFont 2)  */
        SRT_EXT_PAGE = &H14      ' 20  Enhanced Meta File? 
    End Enum

Of these the most important record types are:

SRT_PAGE

This record contains a Windows standard enhanced metafile, consisting of an EMF header and one or more EMF graphics record structures. The EMF header record gives you the dimensions of the boundary rectangle (the area inside the print margins), the number of graphics records that make up the page, and the file size of this single EMF page.

SRT_DEVMODE

This record contains the device settings that apply to the rest of the pages in the document (or until another DEVMODE record is encountered that overrides it). The DEVMODE structure holds details such as the number of copies, the page orientation (landscape versus portrait), the paper size and paper source, and so on.

SRT_EOF

This signifies the end of the spool file records.

Using the EMF spoolfile viewer

To view an EMF spool file, select the menu File -> Open. A dialog box will appear to allow you to browse to the spool file (extension .spl). These are typically held in your $winnt$\System32\spool\ directory. (I have included some samples with this application code as well.)

The viewer allows you to go to a particular page, zoom in and out, and even print the spool file using the following menu options:

  • File
    • Open - Brings up a dialog box to find and open EMF spool files.
    • Print - Allows you to reprint the currently open EMF spool file.
    • Properties - Brings up a dialog box listing the print file properties.
    • Exit - Quits the application.
  • Pages
    • First Page - Goes to the beginning of the document.
    • Previous Page - Goes back one page.
    • Next Page - Goes to the next page.
    • Last Page - Goes to the end of the document.
    • Goto - Goes directly to the selected page.
    • Properties = Brings up a dialog with the properties of this page.
  • View
    • Zoom in enlarges the preview.
    • Zoom out reduces the size of the preview.

Uses for EMF spoolfiles

Since pretty much every application has a print function, the EMF spool file can serve as a quick and dirty portable document format (though much less featured than a PDF). Thus if you have an application and you want to send a file to someone who doesn't have that application to view, you simply use the application's print function and send them the spool file.

In addition, knowing the structure of the spool file means that it is possible to parse the file to extract information from it. You might want to extract just the text from a printed document for archival purposes, and you can do this by parsing the file and extracting the EMR_EXTTEXTOUTA and EMR_EXTTEXTOUTW records.

Acknowledgements

The source code in this application draws heavily on the work of Feng Yuan and Christophe Lindemann as well as numerous others on the various forums and news groups.

Portions of this article based on www.undocprint.org/formats/winspool/spl. These portions are subject to the GNU Free Documentation License and are copyright © 2003-2005 Free Software Foundation, Inc.

History

  • 21 Aug 2006

    Code updated to .NET 2.0 and page navigation improved.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Duncan Edwards Jones
Software Developer (Senior)
Ireland Ireland
C# / SQL Server developer
Microsoft MVP 2006, 2007
Visual Basic .NET

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QuestionEMF extraction Pin
Member 115950069-Apr-15 12:35
memberMember 115950069-Apr-15 12:35 
Questionno exe Pin
Member 114840261-Mar-15 5:29
memberMember 114840261-Mar-15 5:29 
QuestionCannot download file Pin
lally0672-Feb-15 20:36
memberlally0672-Feb-15 20:36 
AnswerRe: Cannot download file Pin
Duncan Edwards Jones2-Feb-15 21:05
professionalDuncan Edwards Jones2-Feb-15 21:05 
QuestionNumber of copies in spl file Pin
Member 1048979220-Jan-15 1:53
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AnswerRe: Number of copies in spl file Pin
Duncan Edwards Jones20-Jan-15 2:54
professionalDuncan Edwards Jones20-Jan-15 2:54 
GeneralRe: Number of copies in spl file Pin
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GeneralRe: Number of copies in spl file Pin
Duncan Edwards Jones21-Jan-15 9:04
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GeneralRe: Number of copies in spl file Pin
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GeneralRe: Number of copies in spl file Pin
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QuestionHello, when I installed into the computer later... Pin
Member 111368691-Dec-14 19:15
memberMember 111368691-Dec-14 19:15 
AnswerRe: Hello, when I installed into the computer later... Pin
Duncan Edwards Jones1-Dec-14 20:43
professionalDuncan Edwards Jones1-Dec-14 20:43 
SuggestionError Pin
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GeneralRe: Error Pin
Duncan Edwards Jones30-Sep-14 2:44
professionalDuncan Edwards Jones30-Sep-14 2:44 
GeneralRe: Error Pin
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GeneralRe: Error Pin
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GeneralRe: Error Pin
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professionalDuncan Edwards Jones30-Sep-14 20:56 
GeneralRe: Error Pin
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QuestionSPL file Convert EMF Has a ERROR Pin
Member 1109947823-Sep-14 17:13
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AnswerRe: SPL file Convert EMF Has a ERROR Pin
Duncan Edwards Jones23-Sep-14 20:36
professionalDuncan Edwards Jones23-Sep-14 20:36 
GeneralRe: SPL file Convert EMF Has a ERROR Pin
Member 1109947823-Sep-14 21:27
memberMember 1109947823-Sep-14 21:27 
GeneralRe: SPL file Convert EMF Has a ERROR Pin
Duncan Edwards Jones24-Sep-14 1:33
professionalDuncan Edwards Jones24-Sep-14 1:33 
QuestionText Extraction when embeded fonts used Pin
Member 1104182028-Aug-14 13:20
memberMember 1104182028-Aug-14 13:20 
AnswerRe: Text Extraction when embeded fonts used Pin
Duncan Edwards Jones8-Sep-14 7:05
professionalDuncan Edwards Jones8-Sep-14 7:05 
QuestionMissing SpoolfileReaderBase file in source code? Pin
juanluisps6-May-14 4:07
memberjuanluisps6-May-14 4:07 
AnswerRe: Missing SpoolfileReaderBase file in source code? Pin
Duncan Edwards Jones7-May-14 6:27
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GeneralRe: Missing SpoolfileReaderBase file in source code? Pin
juanluisps7-May-14 22:47
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QuestionWindows 8 .shd file format Pin
Member 858068523-Apr-14 21:46
memberMember 858068523-Apr-14 21:46 
AnswerRe: Windows 8 .shd file format Pin
Duncan Edwards Jones24-Apr-14 3:06
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AnswerRe: Windows 8 .shd file format Pin
Hedi Sangoku12-Aug-14 3:52
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QuestionPrinting Function Pin
Kimsinae17-Oct-13 21:42
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AnswerRe: Printing Function Pin
nishiki2122-Apr-14 10:07
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GeneralRe: Printing Function Pin
Duncan Edwards Jones23-Apr-14 0:19
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GeneralRe: Printing Function Pin
nishiki2123-Apr-14 4:47
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GeneralRe: Printing Function Pin
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AnswerRe: Printing Function Pin
Duncan Edwards Jones23-Apr-14 0:19
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QuestionLength DEVMODE Pin
DanielRM28-Feb-13 9:39
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QuestionSaving the EMF file Pin
Adi Shavit21-Jun-12 8:22
memberAdi Shavit21-Jun-12 8:22 
AnswerRe: Saving the EMF file Pin
Duncan Edwards Jones12-Jul-12 1:22
memberDuncan Edwards Jones12-Jul-12 1:22 
Questiontried to open a .spl file and is getting this detailed error message.. any idea Pin
freefall_020321-Jun-12 7:17
memberfreefall_020321-Jun-12 7:17 
AnswerRe: tried to open a .spl file and is getting this detailed error message.. any idea Pin
Duncan Edwards Jones25-Jun-12 3:53
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QuestionCrash on load Pin
kelemvorx7-Mar-12 6:17
memberkelemvorx7-Mar-12 6:17 
AnswerRe: Crash on load Pin
Duncan Edwards Jones25-Jun-12 3:53
memberDuncan Edwards Jones25-Jun-12 3:53 
QuestionCannot take the text of the Record Pin
sgkin8-Feb-12 7:34
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AnswerRe: Cannot take the text of the Record Pin
internet7827-Feb-12 0:26
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GeneralMy vote of 5 Pin
LeviButler10-Jan-12 3:00
memberLeviButler10-Jan-12 3:00 
GeneralThere is definitely a difference between executable and source Pin
Member 58133013-Jun-11 2:37
memberMember 58133013-Jun-11 2:37 
GeneralRe: There is definitely a difference between executable and source Pin
Member 800497814-Jun-11 0:58
memberMember 800497814-Jun-11 0:58 
GeneralRe: There is definitely a difference between executable and source Pin
CalcMan5512-Jul-11 8:01
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GeneralRe: There is definitely a difference between executable and source Pin
Duncan Edwards Jones22-Jan-12 10:41
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