create_memory_block_externT_create_memory_block_externCreateMemoryBlockExternCreateMemoryBlockExterncreate_memory_block_extern (Operator)

Name

create_memory_block_externT_create_memory_block_externCreateMemoryBlockExternCreateMemoryBlockExterncreate_memory_block_extern — Create a memory block from an external pointer.

Warning

It is not recommended to use the operator create_memory_block_externcreate_memory_block_externCreateMemoryBlockExternCreateMemoryBlockExterncreate_memory_block_extern in HDevelop.

Signature

create_memory_block_extern( : : Pointer, Size, FreeFunction : MemoryBlockHandle)

Description

create_memory_block_externcreate_memory_block_externCreateMemoryBlockExternCreateMemoryBlockExterncreate_memory_block_extern creates a memory block and returns its handle MemoryBlockHandleMemoryBlockHandleMemoryBlockHandlememoryBlockHandlememory_block_handle. PointerPointerPointerpointerpointer is a data pointer to the beginning of the memory block. SizeSizeSizesizesize controls the size in bytes of the memory block. FreeFunctionFreeFunctionFreeFunctionfreeFunctionfree_function is an optional callback function that frees the memory pointed to by PointerPointerPointerpointerpointer. This function must have the following signature

    void FreeFunction(void* ptr);

and will be called using __cdecl calling convention when deleting MemoryBlockHandleMemoryBlockHandleMemoryBlockHandlememoryBlockHandlememory_block_handle. Hence, HALCON gains ownership over the memory in this case and releases the memory via the callback function. If the memory shall not be released when deleting MemoryBlockHandleMemoryBlockHandleMemoryBlockHandlememoryBlockHandlememory_block_handle, i.e., HALCON shall not own the memory, the NULL-Pointer can be passed.

Attention

This operator does not copy any data. If a copy is required create_memory_block_extern_copycreate_memory_block_extern_copyCreateMemoryBlockExternCopyCreateMemoryBlockExternCopycreate_memory_block_extern_copy can be used.

Execution Information

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Processed without parallelization.

This operator returns a handle. Note that the state of an instance of this handle type may be changed by specific operators even though the handle is used as an input parameter by those operators.

Parameters

PointerPointerPointerpointerpointer (input_control) pointer → (integer)

Data pointer of the memory block.

SizeSizeSizesizesize (input_control) integer → (integer)

Size of the memory block.

FreeFunctionFreeFunctionFreeFunctionfreeFunctionfree_function (input_control) pointer → (integer)

Function to free the memory block.

Default: 0

MemoryBlockHandleMemoryBlockHandleMemoryBlockHandlememoryBlockHandlememory_block_handle (output_control) memory_block → (handle)

Handle of the memory block.

Result

If the parameters are valid, the operator create_memory_block_externcreate_memory_block_externCreateMemoryBlockExternCreateMemoryBlockExterncreate_memory_block_extern returns the value 2 ( H_MSG_TRUE) . If necessary, an exception is raised.

Possible Successors

get_memory_block_ptrget_memory_block_ptrGetMemoryBlockPtrGetMemoryBlockPtrget_memory_block_ptr, compare_memory_blockcompare_memory_blockCompareMemoryBlockCompareMemoryBlockcompare_memory_block, memory_block_to_imagememory_block_to_imageMemoryBlockToImageMemoryBlockToImagememory_block_to_image, write_memory_blockwrite_memory_blockWriteMemoryBlockWriteMemoryBlockwrite_memory_block

Alternatives

create_memory_block_extern_copycreate_memory_block_extern_copyCreateMemoryBlockExternCopyCreateMemoryBlockExternCopycreate_memory_block_extern_copy

Module

Foundation

Operators