DEVMODE info  Overview  Group

The DEVMODE data structure contains information about the device initialization and environment of a printer.

typedef struct _devicemode {    // dvmd 

    BCHAR  dmDeviceName[CCHDEVICENAME]; 

    WORD   dmSpecVersion; 

    WORD   dmDriverVersion; 

    WORD   dmSize; 

    WORD   dmDriverExtra; 

    DWORD  dmFields; 

    short  dmOrientation; 

    short  dmPaperSize; 

    short  dmPaperLength; 

    short  dmPaperWidth; 

    short  dmScale; 

    short  dmCopies; 

    short  dmDefaultSource; 

    short  dmPrintQuality; 

    short  dmColor; 

    short  dmDuplex; 

    short  dmYResolution; 

    short  dmTTOption; 

    short  dmCollate; 

    BCHAR  dmFormName[CCHFORMNAME]; 

    WORD  dmLogPixels; 

    DWORD  dmBitsPerPel; 

    DWORD  dmPelsWidth; 

    DWORD  dmPelsHeight; 

    DWORD  dmDisplayFlags; 

    DWORD  dmDisplayFrequency; 

#if(WINVER >= 0x0400) 

    DWORD  dmICMMethod;         // Windows 95 only 

    DWORD  dmICMIntent;         // Windows 95 only 

    DWORD  dmMediaType;         // Windows 95 only 

    DWORD  dmDitherType;        // Windows 95 only 

    DWORD  dmReserved1;         // Windows 95 only 

    DWORD  dmReserved2;         // Windows 95 only 

#endif /* WINVER >= 0x0400 */ 

} DEVMODE; 

 

Members

dmDeviceName

Specifies the the “friendly” name of the printer; for example, “PCL/HP LaserJet” in the case of PCL/HP LaserJet®. This string is unique among device drivers. Note that this name may be truncated to fit in the dmDeviceName array.

dmSpecVersion

Specifies the version number of the initialization data specification on which the structure is based.

dmDriverVersion

Specifies the printer driver version number assigned by the printer driver developer.

dmSize

Specifies the size, in bytes, of the DEVMODE structure, not including any private driver-specific data that might follow the structure’s public members. You can use this member to determine the number of bytes of public data regardless of the version of the DEVMODE structure being used.

dmDriverExtra

Contains the number of bytes of private driver-data that follow this structure. If a device driver does not use device-specific information, set this member to zero.

dmFields

A set of bit flags that specify whether certain members of the DEVMODE structure have been initialized. If a field is initialized, its corresponding bit flag is set, otherwise the bit flag is clear. A printer driver supports only those DEVMODE structure members that are appropriate for the printer technology.

The following bit flags are defined, and are listed here with the corresponding structure members:

Value	Structure Member
DM_ORIENTATION	dmOrientation
DM_PAPERSIZE	dmPaperSize
DM_PAPERLENGTH	dmPaperLength
DM_PAPERWIDTH	dmPaperWidth
DM_SCALE	dmScale
DM_COPIES	dmCopies
DM_DEFAULTSOURCE	dmDefaultSource
DM_PRINTQUALITY	dmPrintQuality
DM_COLOR	dmColor
DM_DUPLEX	dmDuplex
DM_YRESOLUTION	dmYResolution
DM_TTOPTION	dmTTOption
DM_COLLATE	dmCollate
DM_FORMNAME	dmFormName
DM_LOGPIXELS	dmLogPixels
DM_BITSPERPEL	dmBitsPerPel
DM_PELSWIDTH	dmPelsWidth
DM_PELSHEIGHT	dmPelsHeight
DM_DISPLAYFLAGS	dmDisplayFlags
DM_DISPLAYFREQUENCY	dmDisplayFrequency
DM_ICMMETHOD	Windows 95 only: dmICMMethod
DM_ICMINTENT	Windows 95 only: dmICMIntent
DM_MEDIATYPE	Windows 95 only: dmMediaType
DM_DITHERTYPE	Windows 95 only: dmDitherType

dmOrientation

Selects the orientation of the paper. This member can be either DMORIENT_PORTRAIT (1) or DMORIENT_LANDSCAPE (2).

dmPaperSize

Selects the size of the paper to print on. This member can be set to zero if the length and width of the paper are both set by the dmPaperLength and dmPaperWidth members. Otherwise, the dmPaperSize member can be set to one of the following predefined values:

Value	Meaning
DMPAPER_LETTER	Letter, 8 1/2- by 11-inches
DMPAPER_LEGAL	Legal, 8 1/2- by 14-inches
DMPAPER_A4	A4 Sheet, 210- by 297-millimeters
DMPAPER_CSHEET	C Sheet, 17- by 22-inches
DMPAPER_DSHEET	D Sheet, 22- by 34-inches
DMPAPER_ESHEET	E Sheet, 34- by 44-inches
DMPAPER_LETTERSMALL	Letter Small, 8 1/2- by 11-inches
DMPAPER_TABLOID	Tabloid, 11- by 17-inches
DMPAPER_LEDGER	Ledger, 17- by 11-inches
DMPAPER_STATEMENT	Statement, 5 1/2- by 8 1/2-inches
DMPAPER_EXECUTIVE	Executive, 7 1/4- by 10 1/2-inches
DMPAPER_A3	A3 sheet, 297- by 420-millimeters
DMPAPER_A4SMALL	A4 small sheet, 210- by 297-millimeters
DMPAPER_A5	A5 sheet, 148- by 210-millimeters
DMPAPER_B4	B4 sheet, 250- by 354-millimeters
DMPAPER_B5	B5 sheet, 182- by 257-millimeter paper
DMPAPER_FOLIO	Folio, 8 1/2- by 13-inch paper
DMPAPER_QUARTO	Quarto, 215- by 275-millimeter paper
DMPAPER_10X14	10- by 14-inch sheet
DMPAPER_11X17	11- by 17-inch sheet
DMPAPER_NOTE	Note, 8 1/2- by 11-inches
DMPAPER_ENV_9	#9 Envelope, 3 7/8- by 8 7/8-inches
DMPAPER_ENV_10	#10 Envelope, 4 1/8- by 9 1/2-inches
DMPAPER_ENV_11	#11 Envelope, 4 1/2- by 10 3/8-inches
DMPAPER_ENV_12	#12 Envelope, 4 3/4- by 11-inches
DMPAPER_ENV_14	#14 Envelope, 5- by 11 1/2-inches
DMPAPER_ENV_DL	DL Envelope, 110- by 220-millimeters
DMPAPER_ENV_C5	C5 Envelope, 162- by 229-millimeters
DMPAPER_ENV_C3	C3 Envelope, 324- by 458-millimeters
DMPAPER_ENV_C4	C4 Envelope, 229- by 324-millimeters
DMPAPER_ENV_C6	C6 Envelope, 114- by 162-millimeters
DMPAPER_ENV_C65	C65 Envelope, 114- by 229-millimeters
DMPAPER_ENV_B4	B4 Envelope, 250- by 353-millimeters
DMPAPER_ENV_B5	B5 Envelope, 176- by 250-millimeters
DMPAPER_ENV_B6	B6 Envelope, 176- by 125-millimeters
DMPAPER_ENV_ITALY	Italy Envelope, 110- by 230-millimeters
DMPAPER_ENV_MONARCH	Monarch Envelope, 3 7/8- by 7 1/2-inches
DMPAPER_ENV_PERSONAL	6 3/4 Envelope, 3 5/8- by 6 1/2-inches
DMPAPER_FANFOLD_US	US Std Fanfold, 14 7/8- by 11-inches
DMPAPER_FANFOLD_STD_GERMAN	German Std Fanfold, 8 1/2- by 12-inches
DMPAPER_FANFOLD_LGL_GERMAN	German Legal Fanfold, 8 1/2- by 13-inches

dmPaperLength

Overrides the length of the paper specified by the dmPaperSize member, either for custom paper sizes or for devices such as dot-matrix printers, which can print on a page of arbitrary length. These values, along with all other values in this structure that specify a physical length, are in tenths of a millimeter.

dmPaperWidth

Overrides the width of the paper specified by the dmPaperSize member.

dmScale

Specifies the factor by which the printed output is to be scaled. The apparent page size is scaled from the physical page size by a factor of dmScale/100. For example, a letter-sized page with a dmScale value of 50 would contain as much data as a page of 17- by 22-inches because the output text and graphics would be half their original height and width.

dmCopies

Selects the number of copies printed if the device supports multiple-page copies.

dmDefaultSource

Reserved; must be zero.

dmPrintQuality

Specifies the printer resolution. There are four predefined device-independent values:

DMRES_HIGH
DMRES_MEDIUM
DMRES_LOW
DMRES_DRAFT

If a positive value is given, it specifies the number of dots per inch (DPI) and is therefore device dependent.

dmColor

Switches between color and monochrome on color printers. Following are the possible values:

DMCOLOR_COLOR
DMCOLOR_MONOCHROME

dmDuplex

Selects duplex or double-sided printing for printers capable of duplex printing. Following are the possible values:

DMDUP_SIMPLEX
DMDUP_HORIZONTAL
DMDUP_VERTICAL

dmYResolution

Specifies the y-resolution, in dots per inch, of the printer. If the printer initializes this member, the dmPrintQuality member specifies the x-resolution, in dots per inch, of the printer.

dmTTOption

Specifies how TrueType® fonts should be printed. This member can be one of the following values:

Value	Meaning
DMTT_BITMAP	Prints TrueType fonts as graphics. This is the default action for dot-matrix printers.
DMTT_DOWNLOAD	Downloads TrueType fonts as soft fonts. This is the default action for Hewlett-Packard printers that use Printer Control Language (PCL).
DMTT_SUBDEV	Substitute device fonts for TrueType fonts. This is the default action for PostScript® printers.

dmUnusedPadding

Used to align the structure to a DWORD boundary. This should not be used or referenced. Its name and usage is reserved, and can change in future releases.

dmCollate

Specifies whether collation should be used when printing multiple copies. (This member is ignored unless the printer driver indicates support for collation by setting the dmFields member to DM_COLLATE.) This member can be be one of the following values:

Value	Meaning
DMCOLLATE_TRUE	Collate when printing multiple copies.
DMCOLLATE_FALSE	Do not collate when printing multiple copies.

Using DMCOLLATE_TRUE provides faster, more efficient output for collation, since the data is sent to the device driver just once, no matter how many copies are required. The printer is told to simply print the page again.

dmFormName

Windows NT: Specifies the name of the form to use; for example, “Letter” or “Legal”. A complete set of names can be retrieved by using the EnumForms function.

Windows 95: Printer drivers do not use this member.

dmLogPixels

Specifies the number of pixels per logical inch. Printer drivers do not use this member.

dmBitsPerPel

Specifies the color resolution, in bits per pixel, of the display device (for example: 4 bits for 16 colors, 8 bits for 256 colors, or 16 bits for 65536 colors). Display drivers use this member, for example, in the ChangeDisplaySettings function. Printer drivers do not use this member.

dmPelsWidth

Specifies the width, in pixels, of the visible device surface. Display drivers use this member, for example, in the ChangeDisplaySettings function. Printer drivers do not use this member.

dmPelsHeight

Specifies the height, in pixels, of the visible device surface. Display drivers use this member, for example, in the ChangeDisplaySettings function. Printer drivers do not use this member.

dmDisplayFlags

Specifies the device’s display mode. This member can be one of the following values:

Value	Meaning
DM_GRAYSCALE	Specifies that the display is a noncolor device. If this flag is not set, color is assumed.
DM_INTERLACED	Specifies that the display mode is interlaced. If the flag is not set, noninterlaced is assumed.

Display drivers use this member, for example, in the ChangeDisplaySettings function. Printer drivers do not use this member.

dmDisplayFrequency

Specifies the frequency, in hertz (cycles per second), of the display device in a particular mode. This value is also known as the display device’s vertical refresh rate. Display drivers use this member. It is used, for example, in the ChangeDisplaySettings function. Printer drivers do not use this member.

When you call the EnumDisplaySettings function, the dmDisplayFrequency member may return with the value 0 or 1. These values represent the display hardware’s default refresh rate. This default rate is typically set by switches on a display card or computer motherboard, or by a configuration program that does not use Win32 display functions such as ChangeDisplaySettings.

dmICMMethod

Windows 95:

Specifies how ICM is handled. For a non-ICM application, this member determines if ICM is enabled or disabled. For ICM applications, Windows examines this member to determine how to handle ICM support. This member can be one of the following predefined values, or a driver-defined value greater than the value of DMICMMETHOD_USER:

Value	Meaning
DMICMMETHOD_NONE	Windows 95 only: Specifies that ICM is disabled.
DMICMMETHOD_SYSTEM	Windows 95 only: Specifies that ICM is handled by Windows.
DMICMMETHOD_DRIVER	Windows 95 only: Specifies that ICM is handled by the device driver.
DMICMMETHOD_DEVICE	Windows 95 only: Specifies that ICM is handled by the destination device.

The printer driver must provide a user interface for setting this member. Most printer drivers support only the DMICMMETHOD_SYSTEM or DMICMMETHOD_NONE value. Drivers for PostScript printers support all values.

Windows NT:

This member is not supported on Windows NT.

dmICMIntent

Windows 95:

Specifies which of the three possible color matching methods, or intents, should be used by default. This member is primarily for non-ICM applications. ICM applications can establish intents by using the ICM functions. This member can be one of the following predefined values, or a driver defined value greater than the value of DMICM_USER:

Value	Meaning
DMICM_SATURATE	Windows 95 only: Color matching should optimize for color saturation. This value is the most appropriate choice for business graphs when dithering is not desired.
DMICM_CONTRAST	Windows 95 only: Color matching should optimize for color contrast. This value is the most appropriate choice for scanned or photographic images when dithering is desired.
DMICM_COLORMETRIC	Windows 95 only: Color matching should optimize to match the exact color requested. This value is most appropriate for use with business logos or other images when an exact color match is desired.

Windows NT:

This member is not supported on Windows NT.

dmMediaType

Windows 95:

Specifies the type of media being printed on. The member can be one of the following predefined values, or a driver-defined value greater than the value of DMMEDIA_USER:

Value	Meaning
DMMEDIA_STANDARD	Windows 95 only: Plain paper.
DMMEDIA_GLOSSY	Windows 95 only: Glossy paper.
DMMEDIA_TRANSPARENCY	Windows 95 only: Transparent film.

Windows NT:

This member is not supported on Windows NT.

dmDitherType

Windows 95:

Specifies how dithering is to be done. The member can be one of the following predefined values, or a driver-defined value greater than the value of DMDITHER_USER:

Value	Meaning
DMDITHER_NONE	Windows 95 only: No dithering.
DMDITHER_COARSE	Windows 95 only: Dithering with a coarse brush.
DMDITHER_FINE	Windows 95 only: Dithering with a fine brush.
DMDITHER_LINEART	Windows 95 only: Line art dithering, a special dithering method that produces well defined borders between black, white, and gray scalings. It is not suitable for images that include continuous graduations in intensisty and hue such as scanned photographs.
DMDITHER_GRAYSCALE	Windows 95 only: Device does grayscaling.

Windows NT:

This member is not supported on Windows NT.

dmReserved1

Windows 95: Not used; must be zero.

Windows NT: This member is not supported on Windows NT.

dmReserved2

Windows 95: Not used; must be zero.

Windows NT: This member is not supported on Windows NT.

Remarks

A device driver's private data follows the public portion of the DEVMODE structure. The size of the public data can vary for different versions of the structure. The dmSize member specifies the number of bytes of public data, and the dmDriverExtra member specifies the number of bytes of private data.

See Also

AdvancedDocumentProperties, CreateDC, CreateIC, DeviceCapabilities, DocumentProperties, OpenPrinter 

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