DLL？
DLL
Is a library containing code and data that can be used by multiple programs at the same time. For example, in
Windows operating system
In the operating system, Comdlg32
DLL
Perform common functions related to dialog boxes. So every program can use this.
DLL
To implement the Open dialog box, use the. This helps to promote code reuse and effective use of memory.
By using
DLL, the program can be modular and composed of relatively independent components. For example, accounting programs can be sold in modules. Each module can be loaded into the main program at runtime (if the corresponding module is installed). Because the modules are independent of each other, the loading speed of the program is faster, and the modules are loaded only when the corresponding functions are requested.
In addition, it is easier to apply updates to each module without affecting other parts of the program. For example, you may have a salary calculation program, and the tax rate changes every year. When these changes are isolated to
DLL
After that, you can apply the update without rebuilding or installing the entire program.
The following table illustrates
Windows operating system
Some operating systems act as
DLL
Implemented file:
ActiveX networked multimedia object technology advocated by Microsoft
control
(.ocx)
document
ActiveX networked multimedia object technology advocated by Microsoft
An example of a control is a calendar control that allows you to select a date from a calendar.
control panel
(.cpl)
document
. polariscope
An example of a file is an item located in the control panel. Each item is dedicated.
DLL .
device driver
(.drv)
document
An example of a device driver is a printer driver that controls printing by a printer.