Compressor and Decompressor Installation and Removal
An application can use compressors and decompressors that are already
installed on a system running the Microsoft Windows operating system. An application
can also install compressors and decompressors for general or special uses. Most
applications will not need to install or remove compressors or decompressors
because they are usually installed by a setup program. An application might,
however, install a compressor directly or install a function as a compressor.
An application can install a compressor or decompressor (or a function used as
a compressor or decompressor) by using the ICInstall
function. This function creates an entry in the registry identifying the
compressor or decompressor. Your application or another application can search the
registry to determine if the system contains a compressor or decompressor
suitable for its data. Use ICInstall
to install all compression and decompression drivers.
An application can locate and open an installed compressor or decompressor by
using the ICLocate
functions. When an application finishes using a compressor or decompressor,
it closes it by using the ICClose
An application can remove the registry entry for an installed compressor or
decompressor by using the ICRemove
function. This function removes the registry entry of a compressor or
decompressor that is not currently loaded in memory.
An application can restrict the use of a compressor or decompressor by
installing, opening, closing, and removing it.
Alternatively, to use a function internally as a compressor or decompressor
without installing it in the registry, an application can use the ICOpenFunction
function. This function requires the calling application to have the address
of the function to be used as a compressor or decompressor. When the
application finishes using the function, it must close it by using ICClose
. Because the function was not installed, the application does not need to
remove the function from the registry.
The internal structure of a function used as a compressor or decompressor
should be the same as the DriverProc
entry-point function used by installable drivers. For more information about
entry-point function, see Installable Drivers
An application installing a function as a compressor or decompressor must
remove the function before the application is closed so other applications do not
try to use the function. When removing a function, the application must
identify it with the four-character code used to install it.
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