Available in LEADTOOLS Imaging Pro, Vector, Document, and Medical Imaging toolkits. |
CONTAINERCALLBACK
#include "LtCon.h"
L_INT pEXT_CALLBACK YourFunction(pContainer, nEventType, pEventData, pUserData)
pCONTAINERHANDLE pContainer; |
/* pointer to a container handle */ |
CONTAINEREVENTTYPE nEventType; |
/* container event type */ |
L_VOID * pEventData; |
/* pointer to event specific data */ |
L_VOID * pUserData; |
/* pointer to additional parameters */ |
Handles each event that occurs in the container.
Parameter |
Description |
|
pContainer |
Pointer to a container handle. |
|
nEventType |
The type of the event sent by the container. Possible values are: |
|
|
Value |
Meaning |
|
CONTAINER_EVENT_TYPE_DRAW |
The container is now drawing. |
pEventData |
Pointer to a structure that contains data associated with the event specified in nEventType. When nEventType is CONTAINER_EVENT_TYPE_DRAW, then the pEventData must be type pCONTAINEROBJECTDATA. |
|
|
Keep in mind that this is a void pointer, which must be cast to the appropriate data type for the event data. |
|
pUserData |
A void pointer that you can use to access a variable or structure containing data that your callback function needs. This gives you a way to receive data indirectly from the function that uses this callback function. (This is the same pointer that you pass in the pUserData parameter of the calling function.) |
|
|
Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Required DLLs and Libraries
LTCON For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application |
See Also
Functions: |
Example
For an example, refer to L_ContainerSetCallBack.