c语言结构体数组初始化
最近看一段代码有所迷惑,先简单总结一下。有关结构体数组初始化的问题
struct _m_usmart_nametab usmart_nametab[]=
{
if USMART_USE_WRFUNS==1 //如果使能了读写操作
(void)read_addr,"u32 read_addr(u32 addr)",
(void)write_addr,"void write_addr(u32 addr,u32 val)",
endif
(void)delay_ms,"void delay_ms(u16 nms)",
(void)delay_us,"void delay_us(u32 nus)",
(void)LCD_Clear,"void LCD_Clear(u16 Color)",
(void)LCD_Fill,"void LCD_Fill(u16 xsta,u16 ysta,u16 xend,u16 yend,u16 color)",
(void)LCD_DrawLine,"void LCD_DrawLine(u16 x1, u16 y1, u16 x2, u16 y2)",
(void)LCD_DrawRectangle,"void LCD_DrawRectangle(u16 x1, u16 y1, u16 x2, u16 y2)",
(void)Draw_Circle,"void Draw_Circle(u16 x0,u16 y0,u8 r)",
(void)LCD_ShowNum,"void LCD_ShowNum(u16 x,u16 y,u32 num,u8 len,u8 size)",
(void)LCD_ShowString,"void LCD_ShowString(u16 x,u16 y,u16 width,u16 height,u8 size,u8 p)",
(void)LCD_ReadPoint,"u16 LCD_ReadPoint(u16 x,u16 y)",
(void)fsmc_sram_test_write,"void fsmc_sram_test_write(u8 data,u32 addr)",
(void)fsmc_sram_test_read,"u8 fsmc_sram_test_read(u32 addr)",
(void)mymalloc,"void mymalloc(u8 memx,u32 size)",
(void)myfree,"void myfree(u8 memx,void ptr)",
(void)mf_mount,"u8 mf_mount(u8 drv)",
(void)mf_open,"u8 mf_open(u8path,u8 mode)",
(void)mf_close,"u8 mf_close(void)",
(void)mf_read,"u8 mf_read(u16 len)",
(void)mf_write,"u8 mf_write(u8dat,u16 len)",
(void)mf_opendir,"u8 mf_opendir(u8 path)",
(void)mf_readdir,"u8 mf_readdir(void)",
(void)mf_scan_files,"u8 mf_scan_files(u8 path)",
(void)mf_showfree,"u32 mf_showfree(u8 drv)",
(void)mf_lseek,"u8 mf_lseek(u32 offset)",
(void)mf_tell,"u32 mf_tell(void)",
(void)mf_size,"u32 mf_size(void)",
(void)mf_mkdir,"u8 mf_mkdir(u8pname)",
(void)mf_fmkfs,"u8 mf_fmkfs(u8 drv,u8 mode,u16 au)",
(void)mf_unlink,"u8 mf_unlink(u8 pname)",
(void)mf_rename,"u8 mf_rename(u8 oldname,u8 newname)",
(void)mf_gets,"void mf_gets(u16 size)",
(void)mf_putc,"u8 mf_putc(u8 c)",
(void)mf_puts,"u8 mf_puts(u8c)",
};
_m_usmart_nametab的结构体如下
//函数名列表
struct _m_usmart_nametab
{
void* func; //函数指针
const u8* name; //函数名(查找串)
};
一开始一直不明白,为什么下边的只有两个参数,而上边的确有那么多,难道不是一一对应?
其实上边的是一个table表,就像 u8 table[]={};
而上边的定义的是一个结构体的数组,其成员很多。但每一个成员应该和结构体类型一致,这只不是定义一个这样结构类型的结构体数组而已。
看下面例子
typedef struct _TEST_T {
int i;
char c[10];
}TEST_T;
TEST_T gst = {1, “12345”};//可以初始化,设置i为1,s为一个字符串.
TEST_T gst = {1};//初始化个数少于实际个数时,只初始化前面的成员。
TEST_Tgst = {.c=“12345”};//有选择的初始化成员。
复合字面量。
gst = (TEST_T){122, "1256"};//这是一个赋值语句,也可以作为初始化。可以出现在程序的任何地方。
当然也可以使用复合字面量来初始化:
gst = (TEST_T){.i=122, .c="123"};
3、结构体数组
可以用多个大括号括起来:
TEST_T gst[10] = {{},{},{},{}}
也可以初始化其中的一个元素:
TEST_T gst[10] = {[2]={}, [3]={}}
也可以使用复合字面量:
TEST_T gst[10] = {[2].i=0, [3].i={}}