如何正确将GUID保存为字符串？

Question

I have GUIDs saved in a SQL server table which is linked to a MS-Access database (Data Type in Access: "Replication ID").

In the forms I see the GUID like this: {CFFACB63-5EB1-43B2-BCCB-ACF6B226B4F4}

Now I want to use the GUID in code it only shows as "????????"

Dim strGuid As String
strGuid = CStr(Me.TransGUID)
Debug.Print " strGuid: '" & strGuid & "'"
Debug.Print " Len(strGuid): " & Len(strGuid) & ""

shows: strGuid: '????????', Len(strGuid): 8

I used GUIDs in code before and never had any problems and I see this the first time. I am confused what is happening here. How can I save the GUID the way it is and why does it not save it in the way it should? Any ideas?

The GUID shows as strange characters like Chinese if I show the saved string in a form field.

Answer 1

Access has a built-in function to convert GUIDs to strings.

Dim strGuid As String
strGuid = StringFromGUID(Me.TransGUID)
Debug.Print " strGuid: '" & strGuid & "'"

While you can use native WinAPI functions to convert it, there's no need for that.

Answer 2

GUID is a 16 binary bytes data type and you have to convert it to human readable string to display. You can use API functions for this, see, for instance, here .