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Struct.fields Method

Definition

Returns the number of items in the struct.

public:
 virtual int fields();
public virtual int fields ();
abstract member fields : unit -> int
override this.fields : unit -> int
Public Overridable Function fields () As Integer

Returns

The number of items in the struct.

Remarks

To find the position of an item in a struct, use the Struct.index method.

The following example creates a struct from a container and then uses the fields method to iterate through the contents of the container.

boolean unpack(container packed) 
{ 
    Struct      unpackedProperties; 
    container   structCon; 
    Counter     i; 
    [#currentList,structCon] = packed; 
    unpackedProperties = Struct::create(structCon); 
    for (i=1;i<=unpackedProperties.fields();i++) 
    { 
        switch (unpackedProperties.fieldName(i)) 
        { 
            case #closedOk: 
                break; 
            case #PropertyCaption: 
                if (! dialogForm  
                    || dialogForm  
                    && ! dialogForm.form().design().caption()) 
                    this.caption(unpackedProperties.valueIndex(i)); 
                break; 
            case #dialogFormname: 
                // Do nothing 
                break; 
            case #PropertyAlwaysOnTop: 
                this.alwaysOnTop(unpackedProperties.valueIndex(i)); 
                break; 
            case #PropertyWindowType: 
                this.windowType(unpackedProperties.valueIndex(i)); 
                break; 
            case #defaultButton: 
                this.defaultButton(unpackedProperties.valueIndex(i)); 
                break; 
            default: 
                throw error(strfmt( 
                    "@SYS67326",unpackedProperties.fieldName(i), 
                     classId2Name(classidget(this)))); 
        } 
    } 
    return true; 
}

Applies to