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19 Device API Function
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EndPath
The EndPath function closes a path bracket and selects the path defined by the bracket into the specified device context....Hits: 1674 Rating:
(2.92) votes 373
GetDC
GetDC returns the device context (DC) of a window or other device, given the object's handle. When you are finished using the device context, you should use ReleaseDC to free up system resources. If you try to get the device context of something that is not a device (i.e., pass the function a handle...Hits: 2913 Rating:
(2.96) votes 666
ReleaseDC
ReleaseDC frees up the resources used when you use GetDC to get an object's device context. This function should not be used to destroy a device context obtained from CreateDC -- for those, use DeleteDC instead. This should be done after your program finishes using the device context. The function r...Hits: 1797 Rating:
(3.05) votes 516
CreateDC
CreateDC creates a device context (DC) which references a given object. The object is identified by its name. When you are finished using the device context in your program, use the DeleteDC function to destroy it. Do not use ReleaseDC with device contexts created by this function! The function retu...Hits: 3141 Rating:
(2.96) votes 460
DeleteDC
DeleteDC destroys a device context (DC) which was created by CreateDC. Your program should delete a device context once it has finished using it in order to conserve resources. Do not use this function to close a device context gotten from GetDC -- for those, use ReleaseDC instead. ...Hits: 1736 Rating:
(3.02) votes 397
InvertRgn
InvertRgn inverts the colors of all the pixels inside a region on a given device. The inverse of the pixels is calculated by doing a binary NOT operation on the RGB color value of each pixel. The function returns 0 if an error occured, or a non-zero value if successful. ...Hits: 1949 Rating:
(3.02) votes 616
LineTo
LineTo draws a line from the current point to the point specified on a device. The line is drawn in the color specified by that object's .ForeColor property. After the line is drawn, the endpoint is the new current point. The algorithm Windows uses to draw a line does not actually color the last pix...Hits: 1800 Rating:
(3.10) votes 515
GetWindowDC
The GetWindowDC function retrieves the device context (DC) for the entire window, including title bar, menus, and scroll bars. A window device context permits painting anywhere in a window, because the origin of the device context is the upper-left corner of the window instead of the client area....Hits: 2639 Rating:
(3.09) votes 440
auxGetDevCaps
The auxGetDevCaps function retrieves the capabilities of a given auxiliary output device....Hits: 1844 Rating:
(2.98) votes 395
auxGetNumDevs
The auxGetNumDevs function retrieves the number of auxiliary output devices present in the system....Hits: 1815 Rating:
(2.95) votes 449
auxGetVolume
The auxGetVolume function retrieves the current volume setting of the specified auxiliary output device....Hits: 1912 Rating:
(3.22) votes 472
auxSetVolume
The auxSetVolume function sets the volume of the specified auxiliary output device....Hits: 2478 Rating:
(2.96) votes 502
BeginPath
The BeginPath function opens a path bracket in the specified device context....Hits: 1678 Rating:
(3.06) votes 373
GetBkColor
The GetBkColor function returns the current background color for the specified device context....Hits: 1295 Rating:
(2.84) votes 264
GetLayout
The GetLayout function returns the layout of a device context (DC)....Hits: 1420 Rating:
(3.02) votes 225
MoveToEx
MoveToEx sets the current point of a device. The current point is the starting point from which all graphics APIs ending with "To" (such as LineTo) begin drawing from. Some programming languages call this point the last point referenced. This function also puts the former current point into the vari...Hits: 2159 Rating:
(2.87) votes 680
DeviceIoControl
The DeviceIoControl function sends a control code directly to a specified device driver, causing the corresponding device to perform the corresponding operation....Hits: 3307 Rating:
(2.86) votes 273
DEVNAMES Structure
DEVNAMES-type variables store some information about a device. This information includes the device driver name, the device name, and the names of any output ports it uses. Note that instead of storing strings in the usual way, this structure puts all three strings into extra, where null characters ...Hits: 1950 Rating:
(2.87) votes 228
DEVMODE Structure
DEVMODE-type variables store information about various settings and properties of a device, such as a printer. Some of the properties only apply to certain devices; for example, the dmDisplayFrequency has no meaning for a printer. Look at the dmFields member to determine which of the structure's mem...Hits: 2526 Rating:
(2.96) votes 188