预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

CLSCTX_INPROC_SERVER (int)

The code that creates and manages objects of this class is a DLL that runs in the same process as the caller of the function specifying the class context.

CLSCTX_INPROC_HANDLER (int)

The code that manages objects of this class is an in-process handler. This is a DLL that runs in the client process and implements client-side structures of this class when instances of the class are accessed remotely.

CLSCTX_LOCAL_SERVER (int)

The EXE code that creates and manages objects of this class runs on same machine but is loaded in a separate process space.

CLSCTX_REMOTE_SERVER (int)

A remote context. The code that creates and manages objects of this class is run on a different computer.

CLSCTX_SERVER (int)

Indicates server code, whether in-process, local, or remote. This definition ORs CLSCTX_INPROC_SERVER, CLSCTX_LOCAL_SERVER, and CLSCTX_REMOTE_SERVER.

CLSCTX_ALL (int)

Indicates all class contexts. This definition ORs CLSCTX_INPROC_HANDLER and CLSCTX_SERVER.

VT_NULL (int)

NULL pointer reference.

VT_EMPTY (int)

A property with a type indicator of VT_EMPTY has no data associated with it; that is, the size of the value is zero.

VT_INT (int)

4-byte signed integer value (equivalent to VT_I4).

VT_I1 (int)

1-byte signed integer.

VT_I2 (int)

Two bytes representing a 2-byte signed integer value.

VT_I4 (int)

4-byte signed integer value.

VT_I8 (int)

8-byte signed integer value.

仅限 x64。

VT_UINT (int)

4-byte unsigned integer (equivalent to VT_UI4).

VT_UI1 (int)

1-byte unsigned integer.

VT_UI2 (int)

2-byte unsigned integer.

VT_UI4 (int)

4-byte unsigned integer.

VT_UI8 (int)

8-byte unsigned integer.

x64 only

VT_R4 (int)

32-bit IEEE floating point value.

VT_R8 (int)

64-bit IEEE floating point value.

VT_BOOL (int)

Boolean value.

VT_ERROR (int)

Error code; containing the status code associated with the error.

VT_CY (int)

8-byte two's complement integer (scaled by 10,000).

VT_DATE (int)

64 位浮点数，表示自 December 31, 1899 以来的天数（不是秒）。例如，January 1, 1900 是 2.0，January 2, 1900 是 3.0 等。这与 VT_R8 的存储方式相同。

VT_BSTR (int)

Pointer to a null-terminated Unicode string.

VT_DECIMAL (int)

A decimal structure.

VT_UNKNOWN (int)

A pointer to an object that implements the IUnknown interface.

VT_DISPATCH (int)

A pointer to a pointer to an object was specified.

VT_VARIANT (int)

A type indicator followed by the corresponding value. VT_VARIANT can be used only with VT_BYREF.

VT_ARRAY (int)

If the type indicator is combined with VT_ARRAY by an OR operator, the value is a pointer to a SAFEARRAY. VT_ARRAY can use the OR with the following data types: VT_I1, VT_UI1, VT_I2, VT_UI2, VT_I4, VT_UI4, VT_INT, VT_UINT, VT_R4, VT_R8, VT_BOOL, VT_DECIMAL, VT_ERROR, VT_CY, VT_DATE, VT_BSTR, VT_DISPATCH, VT_UNKNOWN and VT_VARIANT.

VT_BYREF (int)

If the type indicator is combined with VT_BYREF by an OR operator, the value is a reference. Reference types are interpreted as a reference to data, similar to the reference type in C++.

CP_ACP (int)