C语言单引号内放多个字符的问题

freexuejin_business

于 2014-01-15 20:59:26 发布

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本文链接：https://blog.youkuaiyun.com/freexuejin_business/article/details/18322435

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An ordinary character literal that contains more than one c-char is a multicharacter literal. A multicharacter literal has type int and implementation-defined value.

android代码，frameworks/base/include/media/stagefright/MetaData.h文件中有如下定义：

// The following keys map to int32_t data unless indicated otherwise.
enum {
    kKeyMIMEType          = 'mime', // cstring
    kKeyWidth             = 'widt', // int32_t, image pixel
    kKeyHeight            = 'heig', // int32_t, image pixel
    kKeyDisplayWidth      = 'dWid', // int32_t, display/presentation
    kKeyDisplayHeight     = 'dHgt', // int32_t, display/presentation
.............

};

enum {
    kTypeESDS        = 'esds',
    kTypeAVCC        = 'avcc',
    kTypeD263        = 'd263',
};

所以这也是一种用法