Question

关于在Keil c中使用sprintf函数的问题

KEIL C 程序如下：
{
...
unsigned char xdata strbuf1[64]; //打印字符串临时数组1
unsigned char xdata strbuf2[64]; //打印字符串临时数组2
unsigned int xdata a_ADfz[9];

a_ADfz[0] = 0x8800 ;
a_ADfz[1] = 0x8800 ;
a_ADfz[2] = 0x8800 ;
a_ADfz[3] = 0x8800 ;
a_ADfz[4] = 0x8800 ;
a_ADfz[5] = 0x8800 ;
a_ADfz[6] = 0x8800 ;
a_ADfz[7] = 0x8800 ;
a_ADfz[8] = 0x8800 ;

SendCom1("\r\n");
SendCom1( "ADfz1:" );
sprintf(strbuf1,"%04X:%04X:%04X:", a_ADfz[0],a_ADfz[1],a_ADfz[2]);
SendCom1( strbuf1 );
sprintf(strbuf1,"%04X:%04X:%04X:", a_ADfz[3],a_ADfz[4],a_ADfz[5]);
SendCom1( strbuf1 );
sprintf(strbuf1,"%04X:%04X:%04X ", a_ADfz[6],a_ADfz[7],a_ADfz[8]);
SendCom1( strbuf1 );
SendCom1("\r\n");

SendCom1("\r\n");
sprintf(strbuf2,"ADfz2:%04X:%04X:%04X:%04X:%04X:%04X:%04X:%04X:%04X ", a_ADfz[0], a_ADfz[1],

a_ADfz[2], a_ADfz[3], a_ADfz[4], a_ADfz[5], a_ADfz[6], a_ADfz[7], a_ADfz[8] );
SendCom1( strbuf2 );
SendCom1("\r\n");
...
}
打印结果：

ADfz1:8800:8800:8800:8800:8800:8800:8800:8800:8800

ADfz2:8800:8800:8800:8800:880C:0400:0024:841F:9F00

问题：
为什么ADfz1和ADfz2的内容不一样？

Answer 1

因为Keil采用的库函数是精简库，功能没有VC那么强大，具体到sprintf来说，字符串总长度不能超过15个字节，你第一种满足，第二种超了，其实还有些方面也没VC那么强

Answer 2

也许..是堆栈溢出了.
你可以单步调试..看一下你的sp到底跑到哪里去了