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7 API Function starting with letter O
Sort: Top 50 API | Top 50 Rated Rated API
OpenClipboard
The OpenClipboard function opens the clipboard for examination and prevents other applications from modifying the clipboard content....Hits: 7135 Rating:
(3.15) votes 1000
Category: Clipboard
OpenFile
The OpenFile function creates, opens, reopens, or deletes a file....Hits: 15685 Rating:
(2.68) votes 773
Category: File
OpenPrinter
The OpenPrinter function retrieves a handle to the specified printer or print server....Hits: 9360 Rating:
(2.91) votes 1453
Category: Printer
OffsetRect
OffsetRect changes the position of a rectangle without changing its size. If the value to move by is negative, the rectangle is moved left or up (depending on the direction); positive values move it right or down. The function returns 0 if an error occured, or 1 if successful. ...Hits: 4089 Rating:
(2.25) votes 1791
Category: Rectangle
OVERLAPPED Structure
OVERLAPPED-type variables tell the file access functions what part of a file to read or write when asynchronous (overlapped) file access is used. Note that Windows 95/98 does not allow asynchronous file access for disk files, although Windows NT does. The actual offset is identified by combining off...Hits: 4107 Rating:
(2.55) votes 1720
Category: File
OSVERSIONINFO Structure
OSVERSIONINFO-type variables hold information about the version of Windows currently running. This structure holds various pieces of information identifying the version number, platform, and more about Windows...Hits: 3840 Rating:
(2.35) votes 993
Category: System
OPENFILENAME Structure
OPENFILENAME-type variables work with the two Windows file dialog box APIs, GetOpenFileName and GetSaveFileName. This structure is used both to pass information to the function and to return data from it. ...Hits: 7627 Rating:
(3.10) votes 637
Category: File