作业帮问一下这里为什么长度乘以2呀?memset(szUtf8,0,len * 2 + 2);Unicode到UTF8转换char* UnicodeToUtf8(CString unicode){int len; len = WideCharToMultiByte(CP_UTF8,0,(LPCWSTR)unicode,-1,NULL,0,NULL,NULL); char *szUtf8=new char[len + 1];memset(s
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/02 01:34:44
![问一下这里为什么长度乘以2呀?memset(szUtf8,0,len * 2 + 2);Unicode到UTF8转换char* UnicodeToUtf8(CString unicode){int len; len = WideCharToMultiByte(CP_UTF8,0,(LPCWSTR)unicode,-1,NULL,0,NULL,NULL); char *szUtf8=new char[len + 1];memset(s](/uploads/image/z/8708472-0-2.jpg?t=%E9%97%AE%E4%B8%80%E4%B8%8B%E8%BF%99%E9%87%8C%E4%B8%BA%E4%BB%80%E4%B9%88%E9%95%BF%E5%BA%A6%E4%B9%98%E4%BB%A52%E5%91%80%3Fmemset%28szUtf8%2C0%2Clen+%2A+2+%2B+2%29%3BUnicode%E5%88%B0UTF8%E8%BD%AC%E6%8D%A2char%2A+UnicodeToUtf8%28CString+unicode%29%7Bint+len%3B+len+%3D+WideCharToMultiByte%28CP_UTF8%2C0%2C%28LPCWSTR%29unicode%2C-1%2CNULL%2C0%2CNULL%2CNULL%29%3B+char+%2AszUtf8%3Dnew+char%5Blen+%2B+1%5D%3Bmemset%28s)
问一下这里为什么长度乘以2呀?memset(szUtf8,0,len * 2 + 2);Unicode到UTF8转换char* UnicodeToUtf8(CString unicode){int len; len = WideCharToMultiByte(CP_UTF8,0,(LPCWSTR)unicode,-1,NULL,0,NULL,NULL); char *szUtf8=new char[len + 1];memset(s
问一下这里为什么长度乘以2呀?memset(szUtf8,0,len * 2 + 2);
Unicode到UTF8转换
char* UnicodeToUtf8(CString unicode)
{
int len;
len = WideCharToMultiByte(CP_UTF8,0,(LPCWSTR)unicode,-1,NULL,0,NULL,NULL);
char *szUtf8=new char[len + 1];
memset(szUtf8,0,len * 2 + 2);
WideCharToMultiByte (CP_UTF8,0,(LPCWSTR)unicode,-1,szUtf8,len,NULL,NULL);
return wszUtf8;
}
问一下这里为什么长度乘以2呀?memset(szUtf8,0,len * 2 + 2);Unicode到UTF8转换char* UnicodeToUtf8(CString unicode){int len; len = WideCharToMultiByte(CP_UTF8,0,(LPCWSTR)unicode,-1,NULL,0,NULL,NULL); char *szUtf8=new char[len + 1];memset(s
我觉得你这个程序本身可能存在问题.
char *szUtf8=new char[len + 1]; //这个申请的是len+1个char的内存变量
memset(szUtf8,0,len * 2 + 2);//这里要操作的内存空间为 (len+1)*2个的char空间,这个肯定是内存溢出,程序出现未知异常.
我在网上看到过相关的例程,给你参考下
void ConvertGBKToUtf8(char* rtnBuffer,const char* strGBK)
{
int len=MultiByteToWideChar(CP_ACP,0,(LPCTSTR)strGBK,-1,NULL,0);
unsigned short * wszUtf8 = new unsigned short[len+1]; //他这里很明白,空间足够
memset(wszUtf8,0,len * 2 + 2);//对这个来说
MultiByteToWideChar(CP_ACP,0,(LPCTSTR)strGBK,-1,(LPWSTR)wszUtf8,len);
len = WideCharToMultiByte(CP_UTF8,0,(LPCWSTR)wszUtf8,-1,NULL,0,NULL,NULL);
char *szUtf8=new char[len + 1];
memset(szUtf8,0,len + 1);
WideCharToMultiByte (CP_UTF8,0,(LPCWSTR)wszUtf8,-1,szUtf8,len,NULL,NULL);
strcpy(rtnBuffer,szUtf8);
delete[] szUtf8;
delete[] wszUtf8;
}