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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: 2736 Rating:
(3.00) votes 570
Category: Clipboard
OpenFile
The OpenFile function creates, opens, reopens, or deletes a file....Hits: 7185 Rating:
(2.71) votes 618
Category: File
OpenPrinter
The OpenPrinter function retrieves a handle to the specified printer or print server....Hits: 3456 Rating:
(3.03) votes 557
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: 1758 Rating:
(2.94) votes 540
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: 1733 Rating:
(2.99) votes 787
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: 1849 Rating:
(2.96) votes 556
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: 3143 Rating:
(3.10) votes 390
Category: File