Ask for Help (v2) • Get the return value from TC by SendMessage

CODE:

; 25.11.11 Added: Send WM_COPYDATA with dwData='G'+256*'A' 
; and lpData pointing to command to get back WM_COPYDATA with various info. 
; Supported commands A: Active side (returns L or R), 
; or two byte command: first byte: L=left, R=right, S=source, T=target. 
; Second byte: P=current path, C=list count, I=caret index, N=name of file under caret. 
; dwData of return is 'R'+256*'A' (32/64)

CODE:

userCmd:="A"
AcSide:=TC_GetActive(userCmd) 
MsgBox AcSide
TC_GetActive(userCommand) 
{
    ; https://www.autohotkey.com/boards/viewtopic.php?p=538463&sid=4471e03917209854441ac07ebdc70901#p538463
    static dwData := Ord("G") +256*Ord("A")
    static WM_COPYDATA := 0x4A
    cbData := Buffer(StrPut(userCommand, 'CP0'))
    StrPut(userCommand, cbData, 'CP0')
    COPYDATASTRUCT := Buffer(A_PtrSize * 3)
    NumPut('Ptr', dwData, 'Ptr', cbData.size, 'Ptr', cbData.ptr, COPYDATASTRUCT)
    MsgResult:=SendMessage( WM_COPYDATA,, COPYDATASTRUCT,, 'ahk_class TTOTAL_CMD')
    return MsgResult
}