dOPCIntf.dOPCADatatype

T][P] wide null terminated string

dOPCADatatype provides the possible data types of OPC server items.

Delphi

dOPCADatatype = ( vtEMPTY, vtNULL, vtI2, vtI4, vtR4, vtR8, vtCY, vtDATE, vtBSTR, vtDISPATCH, vtERROR, vtBOOL, vtVARIANT, vtUNKNOWN, vtDECIMAL, vtundef, vtI1, vtUI1, vtUI2, vtUI4, vtI8, vtUI8, vtINT, vtUINT, vtVOID, vtHRESULT, vtPTR, vtSAFEARRAY, vtCARRAY, vtUSERDEFINED, vtLPSTR, vtLPWSTR );

C++

enum dOPCADatatype { vtEMPTY, vtNULL, vtI2, vtI4, vtR4, vtR8, vtCY, vtDATE, vtBSTR, vtDISPATCH, vtERROR, vtBOOL, vtVARIANT, vtUNKNOWN, vtDECIMAL, vtundef, vtI1, vtUI1, vtUI2, vtUI4, vtI8, vtUI8, vtINT, vtUINT, vtVOID, vtHRESULT, vtPTR, vtSAFEARRAY, vtCARRAY, vtUSERDEFINED, vtLPSTR, vtLPWSTR };

Members

Members	Description
vtEMPTY	V] [P] nothing nothing
vtNULL	V] SQL style Null SQL style Null
vtI2	V][T][P] 2 byte signed int 2 byte signed int
vtI4	V][T][P] 4 byte signed int 4 byte signed int
vtR4	V][T][P] 4 byte real 4 byte real
vtR8	V][T][P] 8 byte real 8 byte real
vtCY	V][T][P] currency currency
vtDATE	V][T][P] date date
vtBSTR	V][T][P] binary string binary string
vtDISPATCH	V][T] IDispatch FAR IDispatch FAR
vtERROR	V][T] SCODE SCODE
vtBOOL	V][T][P] True,-1, False,0 True, -1, False, 0
vtVARIANT	V][T][P] VARIANT FAR VARIANT FAR
vtUNKNOWN	V][T] IUnknown FAR IUnknown FAR
vtDECIMAL	V][T] [S] 16 byte fixed point 16 byte fixed point
vtundef	undefined
vtI1	T] signed char signed char
vtUI1	T] unsigned char unsigned char
vtUI2	T] unsigned short unsigned short
vtUI4	T] unsigned short unsigned short
vtI8	T][P] signed 64-bit int signed 64-bit int
vtUI8	T] unsigned 64-bit int unsigned 64-bit int
vtINT	T] signed machine int signed machine int
vtUINT	T] unsigned machine int unsigned machine int
vtVOID	T] C style void C style void
vtHRESULT	T T
vtPTR	T] pointer type pointer type
vtSAFEARRAY	T] (use vtARRAY in VARIANT) (use vtARRAY in VARIANT)
vtCARRAY	T] C style array style array
vtUSERDEFINED	T] user defined type user defined type
vtLPSTR	T][P] null terminated string null terminated string
vtLPWSTR	string

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