https://docs.microsoft.com/en-us/windows/win32/api/_dataxchg/ 其中的dde.h 和ddeml.h
2. 西门子接口调用
初始化： DdeInitializeA
连接：
读取数据：
断开连接：DdeDisconnect
去初始化：DdeUninitialize
3. 西门子对应的dde数据
dde service: "machineswitch"
topic: "NCDDE"
address:
"/Bag/State/opMode",
"/Channel/ProgramPointer/progName",
"/Channel/State/AcProg",
"/Channel/MachineAxis/actToolBasePos[u1,1]",
"/Channel/MachineAxis/actToolBasePos[u1,2]",
"/Channel/MachineAxis/actToolBasePos[u1,3]",
"/Channel/Spindle/speedOvr",
"/Channel/MachineAxis/feedRateOvr",
"/Channel/State/rapFeedRateOvr[u1]"