Problem of compiler SP1 2013

Hello

I'm using LabWindows/CVI 2013 SP1. I built my application and there is no warnings or errors. When I ran my application, I found that one of my digital indicators was not being updated. When I looked at the code I saw my mistake, and I did not believe that the compiler did not this error during the generation.

I recently stayed at the update function, that I used "SetCtrlVal" to "SetCtrlAttribute". My mistake was that I have does not add the additional argument that is necessary to "SetCtrlAttribute".

The compiler must have caught that there are not enough arguments sent to the function.

Hi John,.

You do not get a compiler at compile-time error because SetCtrlAttribute take as the 4th parameter a list of Variable arguments.

The prototype of the SetCtrlAttribute is:

int CVIFUNC_C SetCtrlAttribute(int panel, int control, int attribute, ...);

This means that after the first 3 parameters, you can pass 0 or more parameters of any type.

It is the same case as printf; the prototype is:

int  CVIFUNC_C printf(const char *, ...);

You can write to printf ("Hello") as well as printf ("Hello %s", "Word)

Although SetCtrlAttribute needs 4 parameters, the last parameter is declared as a variable argument list (va_arg) as the 4th parameter can be of different type, depending on the attribute or the data type of the control.

However, if you do not put the 4th parameter or it has an incorrect type, you should get a runtime error in the Debug configuration with Runtime checking active (debug level Standard or extended in the compiler Options).

Constantin

Tags: NI Software

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Programme of the United Nations for the compiler wishes to pay get a DLL usable RT
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101,35 undeclared identifier
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122.5 missing prototype

140,10 missing prototype

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[edit]

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[/ Edit]

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