通达信DLL函数编程规范用户可以自己编写公式函数dll载入通达信客户端，用户dll必须遵循通达信接口规范。(请参考示范程序TestPluginTCale)(This file contains a summary of what you will find in each of the files that
make up your TestPluginTCale application.

TestPluginTCale.dsp
　　This file (the project file) contains information at the project level and
　　is used to build a single project or subproject. Other users can share the
　　project (.dsp) file, but they should export the makefiles locally.

TestPluginTCale.cpp
　　This is the main DLL source file.

　　When created, this DLL does not export any symbols. As a result, it
　　will not produce a .lib file when it is built. If you wish this project
　　to be a project dependency of some other project, you will either need to
　　add code to export some symbols from the DLL so that an export library
　　will be produced, or you can check the "doesn't produce lib" checkbox in
　　the Linker settings page for this project.)