The correspondence between VT and common data in VARIANT

For a variant that does not immediately assign a value, it is best to use void VariantInit (Variantarg far* Pvarg) for initialization, which essentially sets VT to VT_EMPTY, and the following table lists the corresponding relationships between VT and commonly used data:

Byte Bval; Vt_ui1.
Short ival; Vt_i2.
Long lval; VT_I4.
float Fltval; Vt_r4.
Double dblval; VT_R8.
Variant_bool Boolval; Vt_bool.
SCODE SCODE; Vt_error.
CY Cyval; Vt_cy.
Date date; Vt_date.
BSTR Bstrval; Vt_bstr.
DECIMAL far* pdecval//vt_byref| Vt_decimal.
IUnknown far* Punkval; Vt_unknown.
IDispatch far* Pdispval; Vt_dispatch.
SAFEARRAY far* Parray; vt_array|*.
Byte far* Pbval; Vt_byref| Vt_ui1.
Short far* pival; Vt_byref| Vt_i2.
Long far* Plval; Vt_byref| VT_I4.
float far* Pfltval; Vt_byref| Vt_r4.
Double far* pdblval; Vt_byref| VT_R8.
Variant_bool far* Pboolval; Vt_byref| Vt_bool.
SCODE far* Pscode; Vt_byref| Vt_error.
CY far* Pcyval; Vt_byref| Vt_cy.
DATE far* pdate; Vt_byref| Vt_date.
BSTR far* Pbstrval; Vt_byref| Vt_bstr.
IUnknown far* far* Ppunkval; Vt_byref| Vt_unknown.
IDispatch far* far* Ppdispval; Vt_byref| Vt_dispatch.
SAFEARRAY far* far* Pparray; vt_array|*.
VARIANT far* Pvarval; Vt_byref| Vt_variant.
void far* ByRef; Generic ByRef.
Char Cval; Vt_i1.
unsigned short uival; Vt_ui2.
unsigned long ulval; Vt_ui4.
int intval; Vt_int.
unsigned int uintval; Vt_uint.
Char FAR * PCVAL; Vt_byref| Vt_i1.
unsigned short FAR * puival; Vt_byref| Vt_ui2.
unsigned long FAR * PULVAL; Vt_byref| Vt_ui4.
int FAR * PINTVAL; Vt_byref| Vt_int.
unsigned int FAR * PUINTVAL; Vt_byref| Vt_uint.