12-18-2007
Lots of tips
I just finished re-writing a cctv utility that does the whole ptz thing. The first cut was a trivial C utility. I built a C++ architecture that does the same thing, but it does it reliably. It is also very extensible, maintainable, flexible, self documenting, supplemented with srs and design docs, and is specialized at three levels to provide a solid foundation.
So, the first thing that I did was to set up a couple libraries. The first one is just a grab bag of basic tools. The second, a set of parameterized classes that provide stream specializations. These not only can work on every platform (with necessary specializations), but can be adapted to different types of com devices. The third library set up an abstract architecture to facilitate stream interactions. The final utility is a specialization of the abstract architecture, and defines specifically how to interact with the target device.
So, all of the generic work is handled using generic stuff. All the specializations are handled in the user code.
-Jmt
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platform(n) Tcl Bundled Packages platform(n)
__________________________________________________________________________________________________________________________________________________
NAME
platform - System identification support code and utilities
SYNOPSIS
package require platform ?1.0.4?
platform::generic
platform::identify
platform::patterns identifier
_________________________________________________________________
DESCRIPTION
The platform package provides several utility commands useful for the identification of the architecture of a machine running Tcl.
Whilst Tcl provides the tcl_platform array for identifying the current architecture (in particular, the platform and machine elements) this
is not always sufficient. This is because (on Unix machines) tcl_platform reflects the values returned by the uname command and these are
not standardized across platforms and architectures. In addition, on at least one platform (AIX) the tcl_platform(machine) contains the CPU
serial number.
Consequently, individual applications need to manipulate the values in tcl_platform (along with the output of system specific utilities) -
which is both inconvenient for developers, and introduces the potential for inconsistencies in identifying architectures and in naming con-
ventions.
The platform package prevents such fragmentation - i.e., it establishes a standard naming convention for architectures running Tcl and
makes it more convenient for developers to identify the current architecture a Tcl program is running on.
COMMANDS
platform::identify
This command returns an identifier describing the platform the Tcl core is running on. The returned identifier has the general for-
mat OS-CPU. The OS part of the identifier may contain details like kernel version, libc version, etc., and this information may con-
tain dashes as well. The CPU part will not contain dashes, making the preceding dash the last dash in the result.
platform::generic
This command returns a simplified identifier describing the platform the Tcl core is running on. In contrast to platform::identify
it leaves out details like kernel version, libc version, etc. The returned identifier has the general format OS-CPU.
platform::patterns identifier
This command takes an identifier as returned by platform::identify and returns a list of identifiers describing compatible architec-
tures.
KEYWORDS
operating system, cpu architecture, platform, architecture
platform 1.0.4 platform(n)