ITfRange::CompareStart method (msctf.h)

2021-10-13

The ITfRange::CompareStart method compares the start anchor position of this range of text to an anchor in another range.

Syntax

HRESULT CompareStart(
  [in]  TfEditCookie ec,
  [in]  ITfRange     *pWith,
  [in]  TfAnchor     aPos,
  [out] LONG         *plResult
);

Parameters

[in] ec

Edit cookie obtained from ITfDocumentMgr::CreateContext or ITfEditSession::DoEditSession.

[in] pWith

Pointer to a specified range in which an anchor is to be compared to this range start anchor.

[in] aPos

Enumeration element that indicates which anchor of the specified pWith range to compare to this range start anchor.

Value	Meaning
TF_ANCHOR_START	Compare this range start anchor with the specified range start anchor.
TF_ANCHOR_END	Compare this range start anchor with the specified range end anchor.

[out] plResult

Pointer to the result of the comparison between this range start anchor and the specified pWith range anchor.

Value	Meaning
-1	This start anchor is behind the anchor of the specified range (position of this start anchor < position of the anchor of the specified range).
0	This start anchor is at the same position as the anchor of the specified range.
+1	This start anchor is ahead of the anchor of the specified range (position of this start anchor > position of the anchor of the specified range).

Return value

This method can return one of these values.

Value	Description
S_OK	The method was successful.
E_FAIL	An unspecified error occurred.
E_INVALIDARG	One or more parameters are invalid.
TF_E_NOLOCK	The value of the ec parameter is an invalid cookie, or the caller does not have a read-only lock.

Remarks

This method will never return 0 unless the two anchors are in a single region. If the caller only requires information about whether the two anchors are positioned at the same location, ITfRange::IsEqualStart is more efficient.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps \| UWP apps]
Minimum supported server	Windows 2000 Server [desktop apps \| UWP apps]
Target Platform	Windows
Header	msctf.h
DLL	Msctf.dll
Redistributable	TSF 1.0 on Windows 2000 Professional

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