1# want.h 2 3 4## 概述 5 6Want是对象间信息传递的载体, 可以用于应用组件间的信息传递。 Want的使用场景之一是作为startAbility的参数, 其包含了指定的启动目标, 以及启动时需携带的相关数据, 如bundleName和abilityName字段分别指明目标Ability所在应用的Bundle名称以及对应包内的Ability名称。当Ability A需要启动Ability B并传入一些数据时, 可使用Want作为载体将这些数据传递给Ability B。 7 8**引用文件**：<AbilityKit/ability_base/want.h> 9 10**库：** libability_base_want.so 11 12**系统能力：** SystemCapability.Ability.AbilityBase 13 14**起始版本：** 15 15 16**相关模块：**[AbilityBase](_ability_base.md) 17 18 19## 汇总 20 21### 文件 22 23| 名称 | 描述 | 24| --------------------------------------------- | ------------------------------------------------------------ | 25| [want.h](want__8h.md) | 声明Want相关能力。<br/>**引用文件**：<AbilityKit/ability_base/want.h><br/>**库**：libability_base_want.so | 26 27 28### 结构体 29 30| 名称 | 描述 | 31| ------------------------------------------------------------ | ---------------------------- | 32| [AbilityBase_Element](_ability_base_element.md#abilitybase_element) {<br/> char* bundleName;<br/> char* moduleName;<br/> char* abilityName;<br/>} | Element数据结构。 | 33| [AbilityBase_Want](_ability_base.md#abilitybase_want) | Want数据结构。 | 34 35 36### 函数 37 38| 名称 | 描述 | 39| ------------------------------------------------------------ | ---------------------------- | 40| [AbilityBase_Want](_ability_base.md#abilitybase_want)* [OH_AbilityBase_CreateWant](_ability_base.md#oh_abilitybase_createwant)([AbilityBase_Element](_ability_base_element.md#abilitybase_element) element) | 创建Want。 | 41| [AbilityBase_ErrorCode](_ability_base.md#abilitybase_errorcode) [OH_AbilityBase_DestroyWant](_ability_base.md#oh_abilitybase_destroywant)([AbilityBase_Want](_ability_base.md#abilitybase_want)* want) | 销毁Want。销毁后的Want不可使用，否则会导致未定义行为。 | 42| [AbilityBase_ErrorCode](_ability_base.md#abilitybase_errorcode) [OH_AbilityBase_SetWantElement](_ability_base.md#oh_abilitybase_setwantelement)([AbilityBase_Want](_ability_base.md#abilitybase_want)* want, [AbilityBase_Element](_ability_base_element.md#abilitybase_element) element) | 设置Want中bundleName、moduleName与abilityName组成的Element结构体。 | 43| [AbilityBase_ErrorCode](_ability_base.md#abilitybase_errorcode) [OH_AbilityBase_GetWantElement](_ability_base.md#oh_abilitybase_getwantelement)([AbilityBase_Want](_ability_base.md#abilitybase_want)* want, [AbilityBase_Element](_ability_base_element.md#abilitybase_element)* element) | 获取Want中bundleName、moduleName与abilityName组成的Element结构体。 | 44| [AbilityBase_ErrorCode](_ability_base.md#abilitybase_errorcode) [OH_AbilityBase_SetWantCharParam](_ability_base.md#oh_abilitybase_setwantcharparam)([AbilityBase_Want](_ability_base.md#abilitybase_want)* want, const char* key, const char* value) | 设置Want Param参数，Param可参考[Want中的parameters参数](js-apis-inner-ability-want.md)。 | 45| [AbilityBase_ErrorCode](_ability_base.md#abilitybase_errorcode) [OH_AbilityBase_GetWantCharParam](_ability_base.md#oh_abilitybase_getwantcharparam)([AbilityBase_Want](_ability_base.md#abilitybase_want)* want, const char* key, char* value, size_t valueSize) | 获取[OH_AbilityBase_SetWantCharParam](#oh_abilitybase_setwantcharparam)方法设置的Want Param参数。 | 46| [AbilityBase_ErrorCode](_ability_base.md#abilitybase_errorcode) [OH_AbilityBase_AddWantFd](_ability_base.md#oh_abilitybase_addwantfd)([AbilityBase_Want](_ability_base.md#abilitybase_want)* want, const char* key, int32_t fd) | 添加Want文件描述符，文件描述符可通过[fs.open](../apis-core-file-kit/js-apis-file-fs.md#fsopen)获取。 | 47| [AbilityBase_ErrorCode](_ability_base.md#abilitybase_errorcode) [OH_AbilityBase_GetWantFd](_ability_base.md#oh_abilitybase_getwantfd)([AbilityBase_Want](_ability_base.md#abilitybase_want)* want, const char* key, int32_t* fd) | 获取Want文件描述符。 | 48