GUIDs

Applies To: Microsoft Dynamics AX 2012 R3, Microsoft Dynamics AX 2012 R2, Microsoft Dynamics AX 2012 Feature Pack, Microsoft Dynamics AX 2012

A GUID (a globally unique identifier) is a 16 byte, or a 128 bit integer that can be used across all computers and networks wherever a unique identifier is required. Such a number has a very low probability of being duplicated.

String Representations of a GUID

Here are two examples of string literals that are valid representations of a GUID value:

• "12345678-BBBb-cCCCC-0000-123456789012"

• "{12345678-BBBb-cCCCC-0000-123456789012}"

The string representation of a GUID must follow the restrictions described in the following table.

Feature	Description
Number of digits	Must have 32 hexadecimal digits.
Dashes	Must have four dash characters embedded at the locations 8-4-4-4-12.
Braces	It is optional to have the string start and end with {} braces.
Length	The string must have a total of either 36 or 38 characters, depending on whether braces are added.
Casing	The hexadecimal digits a-f (or A-F) can be either uppercase or lowercase, or mixed.

GUID Functions

X++ functions that input or output the guid type are listed in the following table.

Function	Description
any2guid	Converts an anytype to a guid.
guid2str	Converts a guid to an str.
newGuid	Generates a random guid value.
str2guid	Converts an str to a guid.
Global::guidFromString	Calls str2guid.
Global::stringFromGuid	Calls guid2str.

Example

The following X++ code example illustrates how to use the GUID functions.

    static void GuidRoundTripJob(Args _args)
    {
        guid guid2;
        str string3;
        ;
        // Convert a guid to a string, and back to a guid.
        guid2 = newGuid();
        info(strFmt("Info_a1:  guid2 == %1", guid2));
    
        string3 = guid2str(guid2);
        info(strFmt("Info_a2:  string3 == %1", string3));
    
        guid2 = str2guid(string3);
        info(strFmt("Info_a3:  guid2 == %1", guid2));
        
        // Test string representations of a guid.
        // Upper versus lower case does not matter.
        guid2 = str2guid("BB345678-abcd-ABCD-0000-bbbbffff9012");
        string3 = guid2str(guid2);
        info(strFmt("Info_b1:  8-4-4-4-12 format for dashes works (%1)", string3));
        info(strFmt("Info_b2:  Mixed upper and lower case works."));
    
        // Dash locations must be exact.
        // Test invalid dash locations, see output is all zeros.
        guid2 = str2guid("CC2345678abcd-ABCD-0000-cccc9012");
        string3 = guid2str(guid2);
        info(strFmt("Info_c1:  These embedded dash locations are required.  %1", string3));
    
        // Braces {} are optional.
        guid2 = str2guid("{DD345678-abcd-ABCD-0000-ddddaaaa9012}");
        string3 = guid2str(guid2);
        info(strFmt("Info_d1:  Braces {} are optional (%1)", string3));
    }

Output

The output that is displayed in the Infolog is as follows. Notice that Microsoft Dynamics AX includes the optional braces when it converts a GUID to a string.

Info_a1:  guid2 == {93945629-734B-475E-99CE-6AA7AFA43259}
Info_a2:  string3 == {93945629-734B-475E-99CE-6AA7AFA43259}
Info_a3:  guid2 == {93945629-734B-475E-99CE-6AA7AFA43259}
Info_b1:  8-4-4-4-12 format for dashes works ({BB345678-ABCD-ABCD-0000-BBBBFFFF9012})
Info_b2:  Mixed upper and lower case works.
Info_c1:  These embedded dash locations are required.  {00000000-0000-0000-0000-000000000000}
Info_d1:  Braces {} are optional ({DD345678-ABCD-ABCD-0000-DDDDAAAA9012})</pre>```


## See also

[Primitive Data Types](primitive-data-types.md)

  
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