c/c++µÄ֪ʶµãÊÕ¼¯
1.¶¯Ì¬»ñµÃÄÚ´æµÄ´úÂë:
void GetMemory(char **p, int num)
{
*p = (char *)malloc(sizeof(char) * num);
}
char* GetMemory2(int num)
{
char* p = (char *)malloc(sizeof(char) * num);
return p;
}
------------------------------------------
´íÎóµÄ´úÂë:
void GetMemory3(char *p, int num)
{
p = (char *)malloc(sizeof(char) * num);
}///////////////´íÎóÔÚÄÄÀï,ÎҾͲ»Ëµ,×Ô¼ºÈ¥²é.
2.strcpy()µÄ´úÂë:
char* strcpy(char* strDest,const char* strSrc)
{
if(strDest==NULL || strSrc==NULL) return NULL;
char* pStr=strDest;
while((*strDest++=*strSrc++)!='\0)
NULL;
return pStr;
}
3.memcpy()µÄ´úÂë:
void* memcpy(char* strDest,const char* strSrc,size_t size)
{
if(strDest==NULL||strSrc==NULL) return NULL;
if(size <=0) return NULL;
char* pStr=strDest;
while(size-->0)
*strDest++=*strSrc++;
return pStr;
}
4.¹ØÓÚsizeof²Ù×÷·û:
char 1
short 2
short int 2
signed short 2
unsigned short 2
int 4
long
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MSComm1.PortOpen = True
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