Cdc class driver

The foreground and background colors of the destination device context are used. To convert color to monochrome, BitBlt sets pixels that match the background color to white and sets all other pixels to black. BitBlt uses the foreground and background colors of the color device context to convert from color to monochrome.

Note that not all device contexts support BitBlt. This point does not have to lie exactly on the chord. The x1 , y1 and x2 , y2 parameters specify the upper-left and lower-right corners, respectively, of a rectangle bounding the ellipse that is part of the chord. The x3 , y3 and x4 , y4 parameters specify the endpoints of a line that intersects the ellipse.

The chord is drawn by using the selected pen and filled by using the selected brush. The figure drawn by the Chord function extends up to, but does not include the right and bottom coordinates. This means that the height of the figure is y2 - y1 and the width of the figure is x2 - x1. The function closes the figure by drawing a line from the current position to the first point of the figure usually, the point specified by the most recent call to the MoveTo member function and connects the lines by using the line join style.

If a figure is closed by using the LineTo member function instead of CloseFigure , end caps are used to create the corner instead of a join. CloseFigure should only be called if there is an open path bracket in the device context.

A figure in a path is open unless it is explicitly closed by using this function. A figure can be open even if the current point and the starting point of the figure are the same.

Any line or curve added to the path after CloseFigure starts a new figure. Creates a memory device context that is compatible with the device specified by pDC. A memory device context is a block of memory that represents a display surface.

It can be used to prepare images in memory before copying them to the actual device surface of the compatible device. When a memory device context is created, GDI automatically selects a 1-by-1 monochrome stock bitmap for it. GDI output functions can be used with a memory device context only if a bitmap has been created and selected into that context.

This function can only be used to create compatible device contexts for devices that support raster operations. See the CDC::BitBlt member function for information regarding bit-block transfers between device contexts. You can also pass a CString object for this parameter.

The lpszDeviceName parameter is used if the module supports more than one device. The Windows DocumentProperties function retrieves this structure filled in for a given device.

The lpInitData parameter must be NULL if the device driver is to use the default initialization if any specified by the user through the Control Panel. Device names follow these conventions: an ending colon : is recommended, but optional. Windows strips the terminating colon so that a device name ending with a colon is mapped to the same port as the same name without a colon.

The driver and port names must not contain leading or trailing spaces. GDI output functions cannot be used with information contexts. You can pass a CString object for this parameter. See CreateDC for the data format for device-specific initialization. The information context provides a fast way to get information about the device without creating a device context.

If this CDC object is the last active device context for a given device, the device is notified and all storage and system resources used by the device are released. An application should not call DeleteDC if objects have been selected into the device context. Objects must first be selected out of the device context before it is deleted. If the mapping mode is one of the other non-constrained modes e.

This parameter is used for the simple case of converting one rectangle from device points to logical points. The function maps the coordinates of each point, or dimension of a size, from the device coordinate system into GDI's logical coordinate system.

The conversion depends on the current mapping mode and the settings of the origins and extents for the device's window and viewport. The rectangle will be drawn with the top and left sides in the color specified by clrTopLeft and the bottom and right sides in the color specified by clrBottomRight. Set to NULL to use the default halftone brush. Call it in a loop as you sample mouse position, in order to give visual feedback. When you call DrawDragRect , the previous rectangle is erased and a new one is drawn.

For example, as the user drags a rectangle across the screen, DrawDragRect will erase the original rectangle and redraw a new one in its new position. By default, DrawDragRect draws the rectangle by using a halftone brush to eliminate flicker and to create the appearance of a smoothly moving rectangle.

This parameter must be a combination of one inner-border flag and one outer-border flag. Accesses drawing capabilities of a video display that are not directly available through the graphics device interface GDI.

Specifies the outcome of the function. When an application calls DrawEscape , the data identified by nInputSize and lpszInputData is passed directly to the specified display driver. The rectangle drawn by this function cannot be scrolled. To scroll an area containing a rectangle drawn by this function, first call DrawFocusRect to remove the rectangle from the display, then scroll the area, and then call DrawFocusRect again to draw the rectangle in the new position.

In other modes, this function does not draw the focus rectangle correctly, but it does not return error values. In several cases, nState depends on the nType parameter. The following list shows the relationship between the four nType values and nState :.

This code draws the size gripper in the bottom-right corner of your window. It's appropriate for the OnPaint handler of a dialog box, which has no styles and normally doesn't contain other controls like a status bar that may give it a size gripper. The function places the icon's upper-left corner at the location specified by x and y. The location is subject to the current mapping mode of the device context. See the example for CWnd::IsIconic. Call this member function to display an image and apply a visual effect to indicate a state, such as a disabled or default state.

The lData parameter specifies the address of the string, and the nTextLen parameter specifies the length. If nTextLen is 0, the string is assumed to be null-terminated. For all other image types, this parameter is ignored.

The meaning of this parameter depends on the image type. Call this member function to format text in the given rectangle. If nCount is -1, the string must be null-terminated.

If nCount is -1, then lpszString is assumed to be a long pointer to a null-terminated string and DrawText computes the character count automatically. Some uFormat flag combinations can cause the passed string to be modified.

It formats text by expanding tabs into appropriate spaces, aligning text to the left, right, or center of the given rectangle, and breaking text into lines that fit within the given rectangle. The type of formatting is specified by nFormat. This member function uses the device context's selected font, text color, and background color to draw the text.

If the selected font is too large for the specified rectangle, the DrawText member function does not attempt to substitute a smaller font. If nCount is -1, the string must be null terminated. Combine using the bitwise OR operator :.

This parameter can be NULL. The type of formatting is specified by nFormat and lpDTParams. You can also pass a CRect object for this parameter. The center of the ellipse is the center of the bounding rectangle specified by x1 , y1 , x2 , and y2 , or lpRect. The ellipse is drawn with the current pen, and its interior is filled with the current brush. The figure drawn by this function extends up to, but does not include, the right and bottom coordinates.

Ends a print job started by a call to the StartDoc member function. Greater than or equal to 0 if the function is successful, or a negative value if an error occurred.

This member function replaces the ENDDOC printer escape, and should be called immediately after finishing a successful print job. If an application encounters a printing error or a canceled print operation, it must not attempt to terminate the operation by using either EndDoc or AbortDoc.

See the "Remarks" section below. The data is passed to the callback function along with the object information. Specifies the last value returned by the callback function. Its meaning is user-defined. For each object of a given type, the callback function that you pass is called with the information for that object. The system calls the callback function until there are no more objects or the callback function returns 0.

In protect-mode applications, you do not have to create this function with the Windows MakeProcInstance function or free the function after use with the FreeProcInstance Windows function. This works for most needs. For some special cases, such as exporting a function by ordinal or aliasing the export, you still need to use an EXPORTS statement in a module-definition file. Callback registration interfaces are now type-safe you must pass in a function pointer that points to the right kind of function for the specific callback.

Also note that all callback functions must trap Microsoft Foundation exceptions before returning to Windows, since exceptions cannot be thrown across callback boundaries. For more information about exceptions, see the article Exceptions. This parameter should be NULL if no data is returned. Zero is returned if the escape is not implemented. A negative value is returned if an error occurred.

The following are common error values:. All other printer escapes are obsolete and are supported only for compatibility with bit applications. For Win32 programming, CDC now provides six member functions that supersede their corresponding printer escapes:.

This member function allows applications to access facilities of a particular device that are not directly available through GDI. Use the first version if your application uses predefined escape values. Use the second version if your application defines private escape values.

Creates a new clipping region that consists of the existing clipping region minus the specified rectangle. Can also be a CRect object. The width of the rectangle, specified by the absolute value of x2 - x1 , must not exceed 32, units. This limit applies to the height of the rectangle as well. Prevents drawing within invalid areas of a window by excluding an updated region in the window from the clipping region associated with the CDC object.

The interpretation of crColor depends on the value of nFillType. It must be either of the following values:. This style is identical to the filling performed by FloodFill. Filling continues outward in all directions as long as the color is encountered. This style is useful for filling areas with multicolored boundaries. This member function offers more flexibility than FloodFill because you can specify a fill type in nFillType. The function begins at the point specified by x and y and fills in all directions to the color boundary.

Only memory-device contexts and devices that support raster-display technology support ExtFloodFill. For more information, see the GetDeviceCaps member function. Call this member function to write a character string within a rectangular region using the currently selected font. This parameter can be one, both, or neither of the following values:.

The rectangular region can be opaque filled with the current background color , and it can be a clipping region. If nOptions is 0 and lpRect is NULL , the function writes text to the device context without using a rectangular region.

By default, the current position is not used or updated by the function. When this flag is set, Windows ignores x and y on subsequent calls to ExtTextOut and uses the current position instead.

Closes any open figures in the current path and fills the path's interior by using the current brush and polygon-filling mode. The function fills the complete rectangle, including the left and top borders, but it does not fill the right and bottom borders. When filling the specified rectangle, FillRect does not include the rectangle's right and bottom sides.

GDI fills a rectangle up to, but does not include, the right column and bottom row, regardless of the current mapping mode. FillRect compares the values of the top , bottom , left , and right members of the specified rectangle. If bottom is less than or equal to top , or if right is less than or equal to left , the rectangle is not drawn.

FillRect is similar to CDC::FillSolidRect ; however, FillRect takes a brush and therefore can be used to fill a rectangle with a solid color, a dithered color, hatched brushes, or a pattern. FillRect usually is slower than FillSolidRect. Fills the region specified by pRgn with the brush specified by pBrush.

The coordinates for the given region are specified in logical units. FillSolidRect usually is faster than FillRect. When you call FillSolidRect , the background color, which was previously set using SetBkColor , is set to the color indicated by clr. Transforms any curves in the path selected into the current device context, and turns each curve into a sequence of lines.

Nonzero if the function is successful; otherwise 0 is returned if the filling could not be completed, the given point has the boundary color specified by crColor , or the point is outside the clipping region. The area is assumed to be bounded as specified by crColor. The FloodFill function begins at the point specified by x and y and continues in all directions to the color boundary. Only memory-device contexts and devices that support raster-display technology support the FloodFill member function.

The function uses the given brush to draw the border. The width and height of the border is always 1 logical unit. If the rectangle's bottom coordinate is less than or equal to top , or if right is less than or equal to left , the rectangle is not drawn.

The border drawn by FrameRect is in the same position as a border drawn by the Rectangle member function using the same coordinates if Rectangle uses a pen that is 1 logical unit wide. The interior of the rectangle is not filled by FrameRect. Draws a border around the region specified by pRgn using the brush specified by pBrush. See the example for CRgn::CombineRgn. A CSize object representing the aspect ratio used by the current aspect ratio filter.

The aspect ratio is the ratio formed by a device's pixel width and height. Information about a device's aspect ratio is used in the creation, selection, and display of fonts. Windows provides a special filter, the aspect-ratio filter, to select fonts designed for a particular aspect ratio from all of the available fonts.

The filter uses the aspect ratio specified by the SetMapperFlags member function. If the background mode is OPAQUE , the system uses the background color to fill the gaps in styled lines, the gaps between hatched lines in brushes, and the background in character cells. The system also uses the background color when converting bitmaps between color and monochrome device contexts. The background mode defines whether the system removes existing background colors on the drawing surface before drawing text, hatched brushes, or any pen style that is not a solid line.

The rectangle is returned in logical coordinates. This parameter should be zero or set to the following value:. Specifies the current state of the bounding rectangle if the function is successful. It can be a combination of the following values:. The current origin of the brush in device units as a CPoint object.

The initial brush origin is at 0,0 of the client area. The return value specifies this point in device units relative to the origin of the desktop window. For more information, see GetCharacterPlacement. Characters that, if processed, would exceed this extent are ignored. Computations for any required ordering or glyph arrays apply only to the included characters. As the function processes the input string, each character and its extent is added to the output, extent, and other arrays only if the total extent has not yet exceeded the maximum.

Once the limit is reached, processing will stop. This parameter can be one or more of the values listed in the dwFlags section of the GetCharacterPlacement topic. If the function succeeds, the return value is the width and height of the string in logical units. Retrieves the widths of consecutive characters in a specified range from the current TrueType font. This array must contain at least as many ABC structures as there are characters in the range specified by the nFirstChar and nLastChar parameters.

The widths returned by this function are in the IEEE floating-point format. The TrueType rasterizer provides "ABC" character spacing after a specific point size has been selected. The ABC widths of the default character are used for characters that are outside the range of the currently selected font. To retrieve the widths of characters in non-TrueType fonts, applications should use the GetCharWidth Windows function.

Retrieves the widths, in logical units, of consecutive glyph indices in a specified range from the current TrueType font. This parameter is only used if the pgi parameter is NULL. The cgi parameter specifies the number of glyph indices in this array. This array must contain at least as many ABC structures as there are glyph indices specified by the cgi parameter.

The returned widths are in the bit IEEE floating-point format. The widths are measured along the base line of the characters.

For example, if nFirstChar identifies the letter 'a' and nLastChar identifies the letter 'z', the function retrieves the widths of all lowercase characters. The function stores the values in the buffer pointed to by lpBuffer. This buffer must be large enough to hold all of the widths. That is, there must be at least 26 entries in the example given.

If a character in the consecutive group of characters does not exist in a particular font, it will be assigned the width value of the default character. Retrieves the widths, in logical coordinates, of consecutive glyph indices in a specified range from the current font. Retrieves the dimensions of the tightest bounding rectangle around the current clipping boundary. This parameter can be one of the metric tables documented in the TrueType Font Files specification published by Microsoft Corporation.

If this parameter is 0, the information is retrieved starting at the beginning of the font file. If this parameter is 0, the information is retrieved starting at the beginning of the table specified by the dwTable parameter. If this value is greater than or equal to the size of the table, GetFontData returns 0.

If this value is NULL , the function returns the size of the buffer required for the font data specified in the dwTable parameter. If this parameter is 0, GetFontData returns the size of the data specified in the dwTable parameter.

Specifies the number of bytes returned in the buffer pointed to by lpData if the function is successful; otherwise The information to retrieve is identified by specifying an offset into the font file and the length of the information to return.

An application can sometimes use the GetFontData member function to save a TrueType font with a document. To do this, the application determines whether the font can be embedded and then retrieves the entire font file, specifying 0 for the dwTable , dwOffset , and cbData parameters.

If bit 1 of otmfsType is set, embedding is not permitted for the font. If bit 1 is clear, the font can be embedded. If bit 2 is set, the embedding is read only. If an application attempts to use this function to retrieve information for a non-TrueType font, the GetFontData member function returns The return value identifies characteristics of the currently selected font.

For a complete listing of possible values, see GetFontLanguageInfo. Ports Namespace. USB device class drivers included in Windows.

Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. USB serial driver Usbser. Please rate your experience Yes No. Any additional feedback? Note If you trying to install a USB device class driver included in Windows, you do not need to download the driver. Note Microsoft encourages you to use in-box drivers whenever possible.

Submit and view feedback for This product This page. Data Structures Enumerations Functions. Returns Total number of buffered bytes received from the device. Note This function is not available on all microcontroller architectures. This function is not available on all microcontroller architectures. Flushes any data waiting to be sent, ensuring that the send buffer is cleared. Returns Next received byte from the device, or a negative value if no data received.

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