X++ reflection runtime functions

บทความ
08/12/2022

This article describes the reflection run-time functions.

classIdGet

Retrieves the numeric identifier (the class ID) of the class that the object that is initialized belongs to.

int classIdGet(class object)

Parameters

Parameter	Description
object	The object to get the class ID for.

Return value

The class ID of the specified object.

Example

static void classIdGetExample(Args _args)
{
    int i;
    WorkTimeCheck w;

    i = classIdGet(w);
    print "Class ID for object is " + int2Str(i);
}

dimOf

Retrieves the number of index elements that space has been allocated for in an X++ array.

int dimOf(anytype object)

Parameters

Parameter	Description
object	The array to determine the dimension size of.

Return value

If the value of the object parameter is an array, the number of elements in the array; otherwise, 0 (zero).

Remarks

The dimOf function is intended for X++ arrays that are declared as the following X++ primitive types:

boolean
date
int
int64
real
utcDateTime

An example is int iAmounts[6];. Arrays of enumeration values and extended data types are also supported if they are ultimately based on one of the preceding primitive data types (such as int). The dimOf function doesn't accept arrays of all X++ primitive types. Here are the array types that the dimOf function doesn't accept:

str
container
anytype
Arrays of class objects
Instances of the Array class

Example

static void JobDimOfArrays(Args _args)
{
    int iAmounts[20], iCounts[];
    ABCModel enumAbcModel[22]; // Enum
    ABCModelType exdtAbcModelType[24]; // Extended data type
    anytype anyThings[26];
    str sNames[28];
    Array myArrayObj; // Class

    info("Start of job.");
    info("--(Next, normal int array, dimOf() accepts it.)");
    info(int2Str(dimOf(iAmounts)));
    info("--(Next, normal enum array, dimOf() accepts it.)");
    info(int2Str(dimOf(enumAbcModel)));
    info("--(Next, normal extended data type array (based on enum), dimOf() accepts it.)");
    info(int2Str(dimOf(exdtAbcModelType)));
    info("--(Next, dynamic int array, dimension not yet set.)");
    info(int2Str(dimOf(iCounts)));
    info("--(Next, dynamic int array, after dimension established.)");

    iCounts[13] = 13;
    info(int2Str(dimOf(iCounts)));
    info(" == == == == == (Next, array types that dimOf() does not support.)");
    info("--(Next, normal anytype array, dimOf() always returns 0.)");
    info(int2Str(dimOf(anyThings)));
    info("--(Next, an instance of class X++ Array, dimOf() always returns 0.)");

    myArrayObj = new Array(Types::Integer);
    myArrayObj.value(1,501);
    info(int2Str(dimOf(myArrayObj)));
    info("--(Next, the lastIndex method provides size information about Array instances.)");
    info(int2Str(myArrayObj.lastIndex()));
    info("--(Next, normal str array, dimOf() does not accept it, job is halted.)");
    info(int2Str(dimOf(sNames)));
    info("End of job.");

}
/************  Actual Infolog output
Message (11:10:06 am)
Start of job.
--(Next, normal int array, dimOf() accepts it.)
20
--(Next, normal enum array, dimOf() accepts it.)
22
--(Next, normal extended data type array (based on enum), dimOf() accepts it.)
24
--(Next, dynamic int array, dimension not yet set.)
0
--(Next, dynamic int array, after dimension established.)
16
== == == == == (Next, array types that dimOf() does not support.)
--(Next, normal anytype array, dimOf() always returns 0.)
0
--(Next, an instance of class X++ Array, dimOf() always returns 0.)
0
--(Next, the lastIndex method provides size information about Array instances.)
1
--(Next, normal str array, dimOf() does not accept it, job is halted.)
Error executing code: Illegal operation on this type of array. (C)JobsJobDimOfArrays - line 41
************/
/***********  Pop-up error dialog box
"Internal error number 25 in script."
This error is caused by the code line...
info(int2Str(dimOf(iCounts)));
...before iCounts was assigned at any index.
***********/

fieldId2Name

Retrieves a string that represents the name of the field that is specified by a table ID number and a field ID number.

str fieldId2Name(int tableid, int fieldid)

Parameters

Parameter	Description
tableid	The ID number of the table. Note: Use the tableName2Id function to specify the ID of a table.
fieldid	The ID number of the field.

Return value

The name of the field.

Remarks

To return a printable version of the field name, use the fieldId2PName function.

Example

The following example sets fn to the name of the field in the Customer (CustGroup) table that has a field ID of 7.

static void fieldId2NameExample(Args _arg)
{
    str fn;
    fn = fieldId2Name(tableName2Id("Customer"),7);
}

fieldId2PName

Retrieves the printable name of the field that is specified by a table ID number and a field ID number.

str fieldId2PName(int tableid, int fieldid)

Parameters

Parameter	Description
tableid	The ID number of the table. Note: Use the tableName2Id function to specify the ID of a table.
fieldid	The ID number of the field. Note: Use the fieldName2Id function to specify the ID of a field.

Return value

The name of the field.

Example

static void fieldId2PNameExample(Args _arg)
{
    str name;
    tableid _tableId;
    fieldid _fieldid;

    _tableId = tableName2Id("Address");
    _fieldId = fieldName2Id(_tableId, "Name");
    name = fieldId2PName(_tableId, _fieldid);
    print name;
}

fieldName2Id

Retrieves the field ID of the table field that is specified by a table ID number and a field ID number.

int fieldName2Id(int tableid, str fieldname)

Parameters

Parameter	Description
tableid	The ID number of the table. Note: Use the tableName2Id function to specify the ID of a table.
fieldname	The name of the field.

Return value

The ID of the field that is specified by the tableid and fieldname parameters.

Example

static void fieldName2IdExample(Args _arg)
{
    int id;

    id = fieldName2Id(tableName2Id("Address"), "Name");
    // Returns 6. Name is the 6th field in the Address table.
    print id;
}

indexId2Name

Retrieves the name of an index.

str indexId2Name(int tableid, int indexid)

Parameters

Parameter	Description
tableid	The ID of the table that the index belongs to.
indexid	The ID of the index.

Return value

The name of the index.

Example

static void indexId2NameExample(Args _arg)
{
    str s;
    tableid id;
    indexid idx;

    id  = tableName2Id("Address");
    idx = indexName2Id(id, "AddrIdx");
    s = indexId2Name(id, idx);
    print "The result of calling indexId2Name is " + s;
}

indexName2Id

Retrieves the ID of an index.

int indexName2Id(int tableid, str indexname)

Parameters

Parameter	Description
tableid	The ID of the table that the index belongs to.
indexname	The name of the index.

Return value

The ID of the index.

Example

static void indexName2IdExample(Args _arg)
{
    indexid idx;
    tableid id;

    id  = tableName2Id("Address");
    idx = indexName2Id(id, "AddrIdx");
    print "Index ID for index name AddrIdx of table Address is " + int2Str(idx);
}

tableId2Name

Retrieves a string that contains the name of a table.

str tableId2Name(int _tableid)

Parameters

Parameter	Description
_tableid	The ID of the table.

Return value

The name of the table.

Example

static void tableId2NameExample(Args _arg)
{
    str s;
    tableid id;

    // Get the ID for table name Address.
    id = tableName2Id("Address");
    print "ID for table name Address is " + int2Str(id);

    // Get the name from the table ID.
    s = tableId2Name(id);
    print "Name for table ID " + int2Str(id) + " is " + s;

    // Get the printable name from the table ID.
    s = tableId2PName(id);
    print "Printable name for table ID " + int2Str(id) + " is " + s;
}

tableId2PName

Retrieves a string that contains the printable name (the label) of a table.

str tableId2PName(int _fieldid)

Parameters

Parameter	Description
_fieldid	The ID of the table.

Return value

The label of the table.

Example

static void tableId2NameExample(Args _arg)
{
    str s;
    tableid id;

    // Get the ID for table name Address.
    id = tableName2Id("Address");
    print "ID for table name Address is " + int2Str(id);

    // Get the name from the table ID.
    s = tableId2Name(id);
    print "Name for table ID " + int2Str(id) + " is " + s;

    // Get the printable name from the table ID.
    s = tableId2PName(id);
    print "Printable name for table ID " + int2Str(id) + " is " + s;
}

tableName2Id

Retrieves the ID of a table.

int tableName2Id(str _name)

Parameters

Parameter	Description
_name	The name of the table.

Return value

The ID of the table.

Example

static void tableName2IdExample(Args _arg)
{
    str s;
    tableid id;

    // Get the ID for the Address table name.
    id = tableName2Id("Address");
    print "ID for the Address table name is " + int2Str(id);

    // Get the name from the table ID.
    s = tableId2Name(id);
    print "Name for table ID " + int2Str(id) + " is " + s;

    // Get the printable name from the table ID.
    s = tableId2PName(id);
    print "Printable name for table ID " + int2Str(id) + " is " + s;
}

typeOf

Retrieves the type of an element.

enum typeOf(anytype _object)

Parameters

Parameter	Description
_object	The element to return the type for.

Return value

A Types system enumeration value.

Example

The following example tests whether the first element in a container, c, is another container that contains a single integer.

if(typeof(conpeek(c, 1)) != Types::Container ||
conlen(conpeek(c, 1)) != 1 ||
typeof(conpeek(conpeek(c, 1), 1)) != Types::Integer)
{
    // More code.
}

แชร์ผ่าน

X++ reflection runtime functions

classIdGet

Parameters

Return value

Example

dimOf

Parameters

Return value

Remarks

Example

fieldId2Name

Parameters

Return value

Remarks

Example

fieldId2PName

Parameters

Return value

Example

fieldName2Id

Parameters

Return value

Example

indexId2Name

Parameters

Return value

Example

indexName2Id

Parameters

Return value

Example

tableId2Name

Parameters

Return value

Example

tableId2PName

Parameters

Return value

Example

tableName2Id

Parameters

Return value

Example

typeOf

Parameters

Return value

Example

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