C编程经典类型转换

 

一，Convert between ANSI and UNICODE strings

 

Details Refer to 

http://www.codeguru.com/forum/showthread.php?t=231165

 

 

（1） ANSI to UNICODE:

 

Char* -> LPCWSTR

 

For example:

 

char *ansistr = "Hello"int lenA = lstrlenA(ansistr);int lenW;BSTR unicodestr;lenW = ::MultiByteToWideChar(CP_ACP, 0, ansistr, lenA, 0, 0);if (lenW > 0){  // Check whether conversion was successful  unicodestr = ::SysAllocStringLen(0, lenW);  ::MultiByteToWideChar(CP_ACP, 0, ansistr, lenA, unicodestr, lenW);}else{  // handle the error}// when done, free the BSTR::SysFreeString(unicodestr);

 

（2）UNICODE to ANSI:

LPCWSTR->Char*

二，CString, String, Char*, int 类型转换

char* 转 int 
#include <stdlib.h>
int atoi(const char *nptr); 
long atol(const char *nptr);
 
char* 转 string  
string s(char *);  
你的只能初始化，在不是初始化的地方最好还是用assign().
 
 
string 转 char *  
char *p = string.c_str(); 
string aa("aaa"); 
char *c=aa.c_str(); 
string mngName； 
char t[200]; 
memset(t,0,200); 
strcpy(t,mngName.c_str());
 

string 转 CString  
CString.format("%s", string.c_str());  
 
char 转 CString  
CString.format("%s", char*);  
 
char 转 string  
string s(char *);  
 
string 转 char *  
char *p = string.c_str();  
 
CString 转 string  
string s(CString.GetBuffer()); 
 
 

未完待续