Function

VipsForeignmap

Declaration [src] 

void*
vips_foreign_map (
  const char* base,
  VipsSListMap2Fn fn,
  void* a,
  void* b
)

Description [src]

Apply a function to every VipsForeign that VIPS knows about. Foreigns are presented to the function in priority order.

Like all VIPS map functions, if fn returns NULL, iteration continues. If it returns non-NULL, iteration terminates and that value is returned. The map function returns NULL if all calls return NULL.

See also

vips_slist_map2().

Parameters

base

Type: const char*

Base class to search below (eg. “VipsForeignLoad”).

The data is owned by the caller of the function.
The value is a NUL terminated UTF-8 string.
fn

Type: VipsSListMap2Fn

Function to apply to each VipsForeign.

a

Type: void*

User data.

The argument can be NULL.
The data is owned by the caller of the function.
b

Type: void*

User data.

The argument can be NULL.
The data is owned by the caller of the function.

Return value

Type: void*

The result of iteration.

The data is owned by the called function.
The return value can be NULL.