MstrAlloc

Board	Supported
Host System	Yes
V4L2	Yes
Clarity UHD	Yes
Concord PoE	No
GenTL	Yes
GevIQ	Yes
GigE Vision	Yes
Indio	No
Iris GTX	Yes
Radient eV-CL	Yes
Rapixo CL	Yes
Rapixo CoF	Yes
Rapixo CXP	Yes
USB3 Vision	Yes

Allocate a String Reader context.

Syntax

AIL_ID MstrAlloc(
    AIL_ID    SysId,        //in
    AIL_INT64 ContextType,  //in
    AIL_INT64 ControlFlag,  //in
    AIL_ID *  ObjectIdPtr   //out
)

Description

This function allocates a String Reader context on the specified system. A String Reader context contains the read parameters, the list of fonts, and the list of string models.

Note: Note that you cannot allocate a fontless context. You must restore one of the predefined fontless context that is distributed with Aurora Imaging Library using MstrRestore.

When the String Reader context is no longer required, release it usingMstrFreeunless M_UNIQUE_ID was specified during allocation; if M_UNIQUE_ID was specified, the smart identifier manages the String Reader context's lifetime and you must not manually free it.

Parameters

SysId (in, AIL_ID)

Specifies the system on which to allocate the String Reader context.

For specifying the system identifier

Value	Description
M_DEFAULT_HOST	Specifies the default Host system of the current Aurora Imaging Library application.
System identifier	Specifies a valid system identifier, previously allocated using MsysAlloc.

ContextType (in, AIL_INT64)

Specifies the type of String Reader context. This parameter must be set to the value below.

For specifying the context

Value	Description
M_FONT_BASED	Specifies a font-based context.

ControlFlag (in, AIL_INT64)

Reserved for future expansion and must be set to M_DEFAULT.

ObjectIdPtr *(out, AIL_ID)

Specifies the address of the variable in which to write the String Reader context identifier or specifies the data type that the function should use to return the String Reader context identifier.

For retrieving the identifier or specifying how to return it

Value	Description
M_NULL	Specifies that you will use this function's return value to obtain the identifier of the allocated String Reader context; in this case, a standard Aurora Imaging Library identifier of type AIL_ID is returned.
M_UNIQUE_ID	Specifies that you will use this function's return value to obtain the identifier of the allocated String Reader context; in this case, an Aurora Imaging Library smart identifier of type _AIL_UNIQUE_STR_ID_is returned instead of a standard Aurora Imaging Library identifier.This setting is only available when using C++11 (or later).An Aurora Imaging Library smart identifier manages the lifespan of the Aurora Imaging Library object it owns (similar to a std::unique_ptr). Note, you can use an Aurora Imaging Library smart identifier as though it were a standard Aurora Imaging Library identifier, except that you cannot use it to manually free the String Reader context (it is freed automatically). For more information, see Aurora Imaging Library smart identifiers.
Address in which to write the identifier	Specifies the address of an AIL_ID in which to write the identifier of the allocated String Reader context.

If allocation fails, M_NULL is written as the identifier. |

Return Value

Type: AIL_ID

The returned value is the String Reader context identifier either as a standard identifier (AIL_ID) or a smart identifier (AIL_UNIQUE_STR_ID). If allocation fails, M_NULL is returned (or nullptr ifM_UNIQUE_ID was specified).