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PFNDPACOMPARECONST function pointer

Defines the prototype for the compare function used by DPA_Sort or DPA_Search when the items being compared are constant objects.

Syntax


typedef int ( CALLBACK *PFNDPACOMPARECONST)(
  _In_opt_  const void *p1,
  _In_opt_  const void *p2,
  _In_      LPARAM lParam
);

Parameters

p1 [in, optional]

Type: const void*

A pointer to the first item in the comparison.

p2 [in, optional]

Type: const void*

A pointer to the second item in the comparison.

lParam [in]

Type: LPARAM

Additional data passed to pfnCmp or pfnCmp.

Return value

Type: int

The meaning of the return values depends on the function that uses this callback prototype. The return values for DPA_Sort are as follows.

less than 0If p1 should be sorted ahead of p2.
equal to 0If p1 and p2 should be sorted together.
greater than 0If p1 should be sorted after p2.

 

The return values for DPA_Search are as follows.

less than 0If p1 should be found ahead of p2.
equal to zeroIf p1 and p2 should be found together.
greater than 0If p1 should be found after p2.

 

Requirements

Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2008 [desktop apps only]

Header

Commctrl.h

See also

PFNDPACOMPARE

 

 

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