C++ char*，const char*，string的相互转换

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C++ char*，const char*，string的相互转换
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/ o& c) A& ~  e5 e6 F$ i/ W1. string转const char*

) u* _- ?7 ~/ u; pstring s ="abc";
consTChar* c_s = s.c_str();
1 G8 `: y3 a6 n5 u$ g  N) G2. const char*转string
   直接赋值即可

constchar* c_s ="abc";
6 R0 [: `' {9 A# a  }string s(c_s);
& P) K" h9 ?/ O3 S2 n+ r, U! k8 L: d 3. string转char*
5 ?7 B- U" z0 Q! p/ Estring s ="abc";
char* c;
4 n9 R/ ~% Z/ iconstint len = s.length();
c =newchar[len+1];
1 X- C  e: @, O' `2 r5 m* Istrcpy(c,s.c_str());

4. char*转string
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8 q( B$ V1 a4 s$ s$ pchar* c ="abc";
string s(c);
5. const char*转char*

1 f9 M. i, t+ f: u8 l. bconstchar* cpc ="abc";
: ~" [4 j) U% J9 u" jchar* pc =newchar[100];//足够长
strcpy(pc,c