RedCrab Calculator


Calling external programs with XCon()

Available from version 6.4 in RedCrab PLUS

  • RedCrab includes an integrated application interface (API). The API can send data to external programs for calculation

  • The externally programmed functions are called by the function XCon() from the RedCrab worksheet

  • The XCon() function sends data to an external program and waits until the program with a result responds

  • Individual values, a single-column lists or tables can be transferred in both directions

  • XCon (value [[, Pipe [, Command]])
  • XCon() expects 1 to 3 parameters

  • The first argument represents the data to be transferred

  • If no further argument is specified, the communication is handled via pipe 0
    • XCon (a)

  • The number of a pipe can be specified as the second argument
    • XCon (a, 2) uses pipe 2

  • If in the external program different functions are integrated, the execute function can be determined with the command string
    • XCon (a, 0, "Prime") The third argument is a command string
  • XCon() can communicate through a pipe number with various external programs

  • The external programs can run on the same computer or on another computer in the network

  • You can run certain functions in the external programmes, specifying by an optional command string


Parallel calculation

  • In general, functions are calculated one by one in the order on which they are invoked

  • RedCrab can perform calculations parallel in external programs

  • For parallel execution enable Async task for this call on the toolbar

  • First a calculator starts all selected XCon() functions. If all external functions are executed with returned results, the rest of the internal tasks are calculated

  • For effective progress, it is advisable to run the parallel calculation on different computers. However, modern computers whose processor has 4 or more cores can bring a considerable speed increase if the parallel calculation on the same computer, because the scheduling of tasks between the different cores will be improved

  • Keep in mind that all parallel processes need to communicate with different pipes

  • The calculated argument can not contain a value from another parallel process

Application interface (API)
Xcon() to call of external programs
Configure application interface (API)
Include API in a Visual Studio project
Programming external functions


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