通过CTAPI和Citect SCADA软件进行数据通讯

官方文档

Citect SCADA 7.20 Technical Reference

参考文献

基于Citect远程控制的变流量堆料控制系统 【王玉增,顾英妮,王维 济南大学,机械工程学院 ，Citect,CTAPI】

正文

组态软件内部变量支持的数据类型

Citect组态软件已被施耐德收购。通过软件提供的API，可以通过高级语言编程和组态软件内部数据点通讯。

下面是一个Python的例子，暂未测试：

https://github.com/mitchyg/Random/blob/master/pyctapi/src/pyctapi.py

#! /usr/bin/python
#
# File: pyctapi.py
# Author: Mitchell Gayner
# Date: 06/08/2009
#
# Desc:
#      Wrapper for Citect CTAPI dll
#    Compatible with Citect V6.1 DLLs
#
#    You must have the following DLLs:
#        - CiDebugHelp.dll
#        - Ct_ipc.dll
#        - CtApi.dll
#        - CtEng32.dll
#        - CtRes32.DLL
#        - CtUtil32.dll
#
import platform
from ctypes import *
import sys

if platform.system() != "Windows":
    raise OSError

class pyCtApi:
    def __init__(self, dllPath_ = "C:/citect/bin/"):
        #Load required DLLs
        CDLL(dllPath_ + '/CiDebugHelp')
        CDLL(dllPath_ + '/CtUtil32')
        CDLL(dllPath_ + '/Ct_ipc')
        self.__libc = CDLL(dllPath_ + '/CtApi')
        self.__cn = None # Create connection object

    def Open(self, address_, username_, password_, mode_ = 0):
        "Open connection to running citect process"
        if self.__cn != None:
            print "Already connected"
            return
        self.__cn = windll.CtApi.ctOpen(address_, username_, password_, 2)

    def Close(self):
        "Close connection to running citect process"
        ct = windll.CtApi.ctClose(self.__cn)
        self.__cn = None

    def Connected(self):
        if self.__ExecCicode("Version(0)") != "":
            return True
        return False

    def TagReadInt(self, tagName_):
        "Read tag from Citect and covert to int"
        str = self.__TagRead(tagName_)
        #try:
        return int(str)
        #except:
        return -1

    def TagReadFloat(self, tagName_):
        "Read tag from Citect and covert to float"
        str = self.__TagRead(tagName_)
        #try:
        return float(str)
        #except:
        return -1

    def TagReadStr(self, tagName_):
        "Read tag from Citect and covert to string"
        str = self.__TagRead(tagName_)
        return str

    def TagWrite(self, tagName_, value_):
        "Write value to Citect tag"
        ok = self.__TagWrite(tagName_, str(value_))
        return ok

    def ExecuteCicode(self, function_):
        return self.__ExecCicode(function_)

    def __TagRead(self, tagName_):
        "PRIVATE: Read tag from Citect tag"
        f = create_string_buffer('\000' * 32)
        ok = windll.CtApi.ctTagRead(self.__cn, tagName_, byref(f), sizeof(f))
        return f.value

    def __TagWrite(self, tagName_, value_):
        "PRIVATE: Write value to Citect tag"
        ok = windll.CtApi.ctTagWrite(self.__cn, tagName_, value_)
        return ok

    def __ExecCicode(self, function_, hWin_=0, nMode_=0):
        f = create_string_buffer('\000' * 32)
        ok = windll.CtApi.ctCicode(self.__cn, function_, hWin_, nMode_, byref(f), sizeof(f), None)
        return f.value

# TODO LIST:
'''DONE extern    HANDLE    CTAPICALL    ctOpen(LPCSTR,LPCSTR,LPCSTR,DWORD);                /* Open CTAPI interface        */'''
# extern    BOOL    CTAPICALL    ctOpenEx(LPCSTR,LPCSTR,LPCSTR,DWORD,HANDLE);
# extern    HANDLE    CTAPICALL    ctClientCreate();
# extern    BOOL    CTAPICALL    ctClientDestroy(HANDLE);
'''DONE extern    BOOL    CTAPICALL    ctClose(HANDLE);                        /* Close CTAPI interface    */'''
# extern    BOOL    CTAPICALL    ctCloseEx(HANDLE, BOOL);
# extern    BOOL    CTAPICALL    ctCancelIO(HANDLE,CTOVERLAPPED*);                /* cancel pending I/O        */
'''DONE extern    DWORD    CTAPICALL    ctCicode(HANDLE,LPCSTR,DWORD,DWORD,LPSTR,DWORD,CTOVERLAPPED*);    /* execute cicode        */'''
# extern    BOOL    CTAPICALL    ctPointWrite(HANDLE,HANDLE,void*,DWORD,CTOVERLAPPED*);        /* write to point handle    */
# extern    BOOL    CTAPICALL    ctPointRead(HANDLE,HANDLE,void*,DWORD,CTOVERLAPPED*);        /* read from point handle    */
# extern    HANDLE    CTAPICALL    ctTagToPoint(HANDLE,LPCSTR,DWORD,CTOVERLAPPED*);        /* convert tag into point handle*/
# extern    BOOL    CTAPICALL    ctPointClose(HANDLE,HANDLE);                    /* free a point handle        */
# extern    HANDLE    CTAPICALL    ctPointCopy(HANDLE);                        /* copy a point handle        */
# extern    BOOL    CTAPICALL    ctPointGetProperty(HANDLE,LPCTSTR,void*,DWORD,DWORD*,DWORD);    /* get point property        */
# extern    DWORD    CTAPICALL    ctPointDataSize(HANDLE);                    /* size of point data buffer    */
# extern    DWORD    CTAPICALL    ctPointBitShift(HANDLE);                    /* calculate bit shift offset    */
# extern    BOOL    CTAPICALL    ctPointToStr(HANDLE,BYTE*,DWORD,BYTE*,DWORD,DWORD);        /* format point data to string    */
# extern    BOOL    CTAPICALL    ctStrToPoint(HANDLE,LPCSTR,DWORD,BYTE*,DWORD,DWORD);        /* format string data into point*/
'''DONE extern    BOOL    CTAPICALL    ctTagWrite(HANDLE,LPCSTR,LPCSTR);                /* write to tag            */'''
'''DONE extern    BOOL    CTAPICALL    ctTagRead(HANDLE,LPCSTR,LPSTR,DWORD);                /* read from tag        */'''
# extern    BOOL    CTAPICALL    ctEngToRaw(double*,double,CTSCALE*,DWORD);            /* scale from eng to raw    */
# extern    BOOL    CTAPICALL    ctRawToEng(double*,double,CTSCALE*,DWORD);            /* scale from raw to eng    */
# extern    BOOL    CTAPICALL    ctGetOverlappedResult(HANDLE,CTOVERLAPPED*,DWORD*,BOOL);    /* get overlapped result    */
# extern    BOOL    CTAPICALL    ctEngToRaw(double*,double,CTSCALE*,DWORD);            /* scale from eng to raw    */
# extern    BOOL    CTAPICALL    ctRawToEng(double*,double,CTSCALE*,DWORD);            /* scale from raw to eng    */
# extern    HANDLE    CTAPICALL    ctFindFirst(HANDLE,LPCTSTR,LPCTSTR,HANDLE*,DWORD);        /* initiate a search        */
# extern    BOOL    CTAPICALL    ctFindNext(HANDLE,HANDLE*);                    /* get the next search item    */
# extern    BOOL    CTAPICALL    ctFindPrev(HANDLE,HANDLE*);                    /* get the prev search item    */
# extern    DWORD    CTAPICALL    ctFindScroll(HANDLE,DWORD,LONG,HANDLE*);            /* scroll to search item    */
# extern    BOOL    CTAPICALL    ctFindClose(HANDLE);                        /* close a search        */
# extern    LONG    CTAPICALL    ctFindNumRecords(HANDLE);                    /* get the total number of records in the search */
# extern    BOOL    CTAPICALL    ctGetProperty(HANDLE,LPCTSTR,void*,DWORD,DWORD*,DWORD);        /* get a named property        */
# extern    HANDLE    CTAPICALL    ctListNew(HANDLE,DWORD);                    /* create poll list        */
# extern    BOOL    CTAPICALL    ctListFree(HANDLE);                        /* free poll list        */
# extern    HANDLE    CTAPICALL    ctListAdd(HANDLE,LPCSTR);                    /* add tag to poll list        */
# extern    BOOL    CTAPICALL    ctListDelete(HANDLE);                        /* delete tag from poll list    */
# extern    BOOL    CTAPICALL    ctListRead(HANDLE,CTOVERLAPPED*);                /* read poll list        */
# extern    BOOL    CTAPICALL    ctListWrite(HANDLE,LPCSTR,CTOVERLAPPED*);            /* write poll list item        */
# extern    BOOL    CTAPICALL    ctListData(HANDLE,void*,DWORD,DWORD);                /* get list data        */
# extern    HANDLE    CTAPICALL    ctListEvent(HANDLE,DWORD);                    /* get list event        */
# extern  BOOL    CTAPICALL      ctGetNumberOfLicenses(HANDLE, SHORT*, BYTE);        /* Key Check CTAPI interface */

Python代码