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C-Action help

Created by: kevin001 at: 3/24/2008 10:27 PM (6 Replies)

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3/24/2008 10:27 PM	Rate (0)
kevin001 Posts: 3 Rating: (0)	#include "apdefap.h" void OnPropertyChanged(char* lpszPictureName, char* lpszObjectName, char* lpszPropertyName, BOOL value) { BOOL Signal, Neg, NegRes, Result; Signal = GetPropBOOL(lpszPictureName,lpszObjectName,"Signal"); Neg = GetPropBOOL(lpszPictureName,lpszObjectName,"Sig_neg"); NegRes = GetPropBOOL(lpszPictureName,lpszObjectName,"NegRes"); Result = ((Neg == NegRes) == Signal); SetPropBOOL (lpszPictureName,lpszObjectName,"@On_Vis",Result); SetPropBOOL (lpszPictureName,lpszObjectName,"@Off_Vis",!Result); } Does anybody can explain this code to me? Thanks. I do not understand "*Result = ((Neg == NegRes) == Signal);*"
kevin001 Posts: 3 Rating: (0)
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3/24/2008 11:01 PM	Rate (1)
candyengineer Posts: 218 Rating: (26)	Hello kevin001 , I hope I clearly understand your question. *Result = ((Neg == NegRes) == Signal);" "=" is for appointing(assinging) values to variables / variables to variables. a = 5 ; right assigned to left. "==" is for logical condition operation a==5 ; means "a is equal to 5" Result = ((Neg == NegRes) == Signal);*" (Neg == NegRes) if they equals to each other (if both are true) and result of this equation must be equal to "Signal" finally result of all equations will be assigned to the right "result" here is my program same as yours : BOOL a ,b,c,d; a = GetTagBit("failure"); b = GetTagBit("emergency"); c = GetTagBit("tempalarm"); d = ((a == b) == c); //this is a big alarm :-) return d; I hope this will help . Best regards.
candyengineer Posts: 218 Rating: (26)
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3/25/2008 1:32 PM	Rate (0)
kevin001 Posts: 3 Rating: (0)	Hi candyengineer, Thank you for your help! I appreciate it. Kevin.
kevin001 Posts: 3 Rating: (0)
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3/25/2008 2:07 PM	Rate (0)
ateam Posts: 170 Rating: (26)	hi kevin, ================= (1) note ================= to my mind it is unusually using the GetPropXXX()-functions to get process informations. The solution of candymanusing GetTag()-function is muchbetter. Note: If the different error bits of the plc occupy the same byte, word or double word you can read the whole WORD. WORD wError; wError = GetTagWord("YourErrorTag"); if (wError != 0){ //one or more error exists ..... }else{ //evrything is ok ..... } ===================================== (2) Result = ((Neg == NegRes) == Signal);" ===================================== It's not quit correct. Result is true if all signals "Neg", "NegRes" and "Signal" are equal. ==> all signals are true or all signals are false.
ateam Posts: 170 Rating: (26)
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3/25/2008 2:13 PM	Rate (0)
kevin001 Posts: 3 Rating: (0)	Hi ateam, Thanks:)
kevin001 Posts: 3 Rating: (0)
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3/26/2008 2:10 PM	Rate (0)
candyengineer Posts: 218 Rating: (26)	Your welcome kevin001, Best regards
candyengineer Posts: 218 Rating: (26)
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3/27/2008 7:19 PM	Rate (0)
Sydney Gold Member Joined: 1/4/2008 Last visit: 12/22/2025 Posts: 703 Rating: (98)	Hello, imho ateam isn't right in the last sentence,there is agood explanation from candyengineer... There is a comparation of first two variables and the result is compared with the third variable, so if all variables are TRUE the result is also TRUE, but if all the variables are FALSE the result is also FALSE. TRUE result isonly when the third variable has the same value as the result from comparation of first two variables. And another explanation, "GetProp" functions are normaly used for this purpose when there is a customized object with defined properties connected to tags (or by another way to process data) and one needs to evaluate something from their values ina script...

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