Gets data about the specified column in the specified table.
Syntax
HRESULT GetColumnInfo (
[in] ULONG ixTbl,
[in] ULONG ixCol,
[out] ULONG *poCol,
[out] ULONG *pcbCol,
[out] ULONG *pType,
[out] const char **ppName
);
Parameters
=======
ixTbl
[in] The index of the desired table.
ixCol
[in] The index of the desired column.
poCol
[out] A pointer to the offset of the column in the row.
pcbCol
[out] A pointer to the size, in bytes, of the column.
pType
[out] A pointer to the type of the values in the column.
ppName
[out] A pointer to a pointer to the column name.
Remarks
The returned column type falls within a range of values:
| pType | Description | Helper function |
|---|---|---|
0..iRidMax(0..63) |
Rid | IsRidType IsRidOrToken |
iCodedToken..iCodedTokenMax(64..95) |
Coded token | IsCodedTokenType IsRidOrToken |
iSHORT (96) |
Int16 | IsFixedType |
iUSHORT (97) |
UInt16 | IsFixedType |
iLONG (98) |
Int32 | IsFixedType |
iULONG (99) |
UInt32 | IsFixedType |
iBYTE (100) |
Byte | IsFixedType |
iSTRING (101) |
String | IsHeapType |
iGUID (102) |
Guid | IsHeapType |
iBLOB (103) |
Blob | IsHeapType |
Values that are stored in the heap (that is, IsHeapType == true) can be read using:
iSTRING: IMetadataTables.GetStringiGUID: IMetadataTables.GetGUIDiBLOB: IMetadataTables.GetBlob
Important
To use the constants defined in the table above, include the directive #define _DEFINE_META_DATA_META_CONSTANTS provided by the cor.h header file.
Requirements
Platforms: See .NET supported operating systems.
Header: Cor.h
Library: CorGuids.lib
