VS2010中各种类型的转换.docxVIP

VS2010中各种类型的转换此示例演示如何从 char * 转换为上面列出的其他字符串类型。 char * 字符串（也称为 C 样式字符串）使用 null 字符指示字符串的末尾。 C 样式字符串通常每个字符需要一个字节，但也可以使用两个字节。在下面的示例中，char * 字符串有时称为多字节字符字符串，因为该字符串数据是从 Unicode 字符串转换得到的。可对 char * 字符串执行单字节和多字节字符 (MBCS) 函数运算。代码复制 // convert_from_char.cpp// compile with: /clr /link comsuppw.lib#include iostream#include stdlib.h#include string#include atlbase.h#include atlstr.h#include comutil.husing namespace std;using namespace System;int main(){ // Create and display a C style string, and then use it // to create different kinds of strings. char *orig = Hello, World!; cout orig (char *) endl; // newsize describes the length of the // wchar_t string called wcstring in terms of the number // of wide characters, not the number of bytes. size_t newsize = strlen(orig) + 1; // The following creates a buffer large enough to contain // the exact number of characters in the original string // in the new format. If you want to add more characters // to the end of the string, increase the value of newsize // to increase the size of the buffer. wchar_t * wcstring = new wchar_t[newsize]; // Convert char* string to a wchar_t* string. size_t convertedChars = 0; mbstowcs_s(convertedChars, wcstring, newsize, orig, _TRUNCATE); // Display the result and indicate the type of string that it is. wcout wcstring _T( (wchar_t *)) endl; // Convert the C style string to a _bstr_t string. _bstr_t bstrt(orig); // Append the type of string to the new string // and then display the result. bstrt += (_bstr_t); cout bstrt endl; // Convert the C style string to a CComBSTR string. CComBSTR ccombstr(orig); if (ccombstr.Append(_T( (CComBSTR))) == S_OK) { CW2A printstr(ccombstr); cout printstr endl; } // Convert the C style string to a CstringA and display it. CStringA cstringa(orig); cstringa += (CStringA); cout cstringa endl; // Convert the C st