Method

VipsImagemap

Declaration [src] 

void*
vips_image_map (
  VipsImage* image,
  VipsImageMapFn fn,
  void* a
)

Description [src]

This function calls fn for every header field, including every item of metadata.

Like all _map functions, the user function should return NULL to continue iteration, or a non-NULL pointer to indicate early termination.

See also

vips_image_get_typeof() or vips_image_get().

Parameters

fn

Type: VipsImageMapFn

Function to call for each header field.

a

Type: void*

User data for fn.

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

Return value

Type: void*

NULL on success, the failing pointer otherwise.

The returned data is owned by the instance.
The return value can be NULL.