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如何：在各种字符串类型之间进行转换

發(fā)布時(shí)間：2025/3/15 编程问答 22 豆豆

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[MSDN:http://msdn.microsoft.com/zh-cn/library/ms235631(VS.80).aspx]

從 char * 轉(zhuǎn)換

示例

此示例演示如何從 char * 轉(zhuǎn)換為上面列出的其他字符串類型。

復(fù)制代碼

// 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.h"

using namespace std;
using namespace System;

int main()
{
char *orig = "Hello, World!";
cout << orig << " (char *)" << endl;

// Convert to a wchar_t*
size_t origsize = strlen(orig) + 1;
const size_t newsize = 100;
size_t convertedChars = 0;
wchar_t wcstring[newsize];
mbstowcs_s(&convertedChars, wcstring, origsize, orig, _TRUNCATE);
wcscat_s(wcstring, L" (wchar_t *)");
wcout << wcstring << endl;

// Convert to a _bstr_t
_bstr_t bstrt(orig);
bstrt += " (_bstr_t)";
cout << bstrt << endl;

// Convert to a CComBSTR
CComBSTR ccombstr(orig);
if (ccombstr.Append(L" (CComBSTR)") == S_OK)
{
CW2A printstr(ccombstr);
cout << printstr << endl;
}

// Convert to a CString
CString cstring(orig);
cstring += " (CString)";
cout << cstring << endl;

// Convert to a basic_string
string basicstring(orig);
basicstring += " (basic_string)";
cout << basicstring << endl;

// Convert to a System::String
String ^systemstring = gcnew String(orig);
systemstring += " (System::String)";
Console::WriteLine("{0}", systemstring);
delete systemstring;
}

輸出

Hello, World! (char *)
Hello, World! (wchar_t *)
Hello, World! (_bstr_t)
Hello, World! (CComBSTR)
Hello, World! (CString)
Hello, World! (basic_string)
Hello, World! (System::String)

從 wchar_t * 轉(zhuǎn)換

示例

此示例演示如何從 wchar_t * 轉(zhuǎn)換為上面列出的其他字符串類型。

復(fù)制代碼

// convert_from_wchar_t.cpp
// compile with: /clr /link comsuppw.lib

#include <iostream>
#include <stdlib.h>
#include <string>

#include "atlbase.h"
#include "atlstr.h"
#include "comutil.h"

using namespace std;
using namespace System;

int main()
{
wchar_t *orig = L"Hello, World!";
wcout << orig << L" (wchar_t *)" << endl;

// Convert to a char*
size_t origsize = wcslen(orig) + 1;
const size_t newsize = 100;
size_t convertedChars = 0;
char nstring[newsize];
wcstombs_s(&convertedChars, nstring, origsize, orig, _TRUNCATE);
strcat_s(nstring, " (char *)");
cout << nstring << endl;

// Convert to a _bstr_t
_bstr_t bstrt(orig);
bstrt += " (_bstr_t)";
cout << bstrt << endl;

// Convert to a CComBSTR
CComBSTR ccombstr(orig);
if (ccombstr.Append(L" (CComBSTR)") == S_OK)
{
CW2A printstr(ccombstr);
cout << printstr << endl;
}

// Convert to a CString
CString cstring(orig);
cstring += " (CString)";
cout << cstring << endl;

// Convert to a basic_string
wstring basicstring(orig);
basicstring += L" (basic_string)";
wcout << basicstring << endl;

// Convert to a System::String
String ^systemstring = gcnew String(orig);
systemstring += " (System::String)";
Console::WriteLine("{0}", systemstring);
delete systemstring;
}

輸出

Hello, World! (wchar_t *)
Hello, World! (char *)
Hello, World! (_bstr_t)
Hello, World! (CComBSTR)
Hello, World! (CString)
Hello, World! (basic_string)
Hello, World! (System::String)

從 _bstr_t 轉(zhuǎn)換

示例

此示例演示如何從 _bstr_t 轉(zhuǎn)換為上面列出的其他字符串類型。

復(fù)制代碼

// convert_from_bstr_t.cpp
// compile with: /clr /link comsuppw.lib

#include <iostream>
#include <stdlib.h>
#include <string>

#include "atlbase.h"
#include "atlstr.h"
#include "comutil.h"

using namespace std;
using namespace System;

int main()
{
_bstr_t orig("Hello, World!");
wcout << orig << " (_bstr_t)" << endl;

// Convert to a char*
const size_t newsize = 100;
char nstring[newsize];
strcpy_s(nstring, (char *)orig);
strcat_s(nstring, " (char *)");
cout << nstring << endl;

// Convert to a wchar_t*
wchar_t wcstring[newsize];
wcscpy_s(wcstring, (wchar_t *)orig);
wcscat_s(wcstring, L" (wchar_t *)");
wcout << wcstring << endl;

// Convert to a CComBSTR
CComBSTR ccombstr((char *)orig);
if (ccombstr.Append(L" (CComBSTR)") == S_OK)
{
CW2A printstr(ccombstr);
cout << printstr << endl;
}

// Convert to a CString
CString cstring((char *)orig);
cstring += " (CString)";
cout << cstring << endl;

// Convert to a basic_string
string basicstring((char *)orig);
basicstring += " (basic_string)";
cout << basicstring << endl;

// Convert to a System::String
String ^systemstring = gcnew String((char *)orig);
systemstring += " (System::String)";
Console::WriteLine("{0}", systemstring);
delete systemstring;
}

輸出

Hello, World! (_bstr_t)
Hello, World! (char *)
Hello, World! (wchar_t *)
Hello, World! (CComBSTR)
Hello, World! (CString)
Hello, World! (basic_string)
Hello, World! (System::String)

從 CComBSTR 轉(zhuǎn)換

示例

此示例演示如何從 CComBSTR 轉(zhuǎn)換為上面列出的其他字符串類型。

復(fù)制代碼

// convert_from_ccombstr.cpp
// compile with: /clr /link comsuppw.lib

#include <iostream>
#include <stdlib.h>
#include <string>

#include "atlbase.h"
#include "atlstr.h"
#include "comutil.h"
#include "vcclr.h"

using namespace std;
using namespace System;
using namespace System::Runtime::InteropServices;

int main()
{
CComBSTR orig("Hello, World!");
CW2A printstr(orig);
cout << printstr << " (CComBSTR)" << endl;

// Convert to a char*
const size_t newsize = 100;
char nstring[newsize];
CW2A tmpstr1(orig);
strcpy_s(nstring, tmpstr1);
strcat_s(nstring, " (char *)");
cout << nstring << endl;

// Convert to a wchar_t*
wchar_t wcstring[newsize];
wcscpy_s(wcstring, orig);
wcscat_s(wcstring, L" (wchar_t *)");
wcout << wcstring << endl;

// Convert to a _bstr_t
_bstr_t bstrt(orig);
bstrt += " (_bstr_t)";
cout << bstrt << endl;

// Convert to a CString
CString cstring(orig);
cstring += " (CString)";
cout << cstring << endl;

// Convert to a basic_string
wstring basicstring(orig);
basicstring += L" (basic_string)";
wcout << basicstring << endl;

// Convert to a System::String
String ^systemstring = gcnew String(orig);
systemstring += " (System::String)";
Console::WriteLine("{0}", systemstring);
delete systemstring;
}

輸出

Hello, World! (CComBSTR)
Hello, World! (char *)
Hello, World! (wchar_t *)
Hello, World! (_bstr_t)
Hello, World! (CString)
Hello, World! (basic_string)
Hello, World! (System::String)

從 CString 轉(zhuǎn)換

示例

此示例演示如何從 CString 轉(zhuǎn)換為上面列出的其他字符串類型。

復(fù)制代碼

// convert_from_cstring.cpp
// compile with: /clr /link comsuppw.lib

#include <iostream>
#include <stdlib.h>
#include <string>

#include "atlbase.h"
#include "atlstr.h"
#include "comutil.h"

using namespace std;
using namespace System;

int main()
{
CString orig("Hello, World!");
wcout << orig << " (CString)" << endl;

// Convert to a char*
const size_t newsize = 100;
char nstring[newsize];
strcpy_s(nstring, orig);
strcat_s(nstring, " (char *)");
cout << nstring << endl;

// Convert to a wchar_t*
// You must first convert to a char * for this to work.
size_t origsize = strlen(orig) + 1;
size_t convertedChars = 0;
wchar_t wcstring[newsize];
mbstowcs_s(&convertedChars, wcstring, origsize, orig, _TRUNCATE);
wcscat_s(wcstring, L" (wchar_t *)");
wcout << wcstring << endl;

// Convert to a _bstr_t
_bstr_t bstrt(orig);
bstrt += " (_bstr_t)";
cout << bstrt << endl;

// Convert to a CComBSTR
CComBSTR ccombstr(orig);
if (ccombstr.Append(L" (CComBSTR)") == S_OK)
{
CW2A printstr(ccombstr);
cout << printstr << endl;
}

// Convert to a basic_string
string basicstring(orig);
basicstring += " (basic_string)";
cout << basicstring << endl;

// Convert to a System::String
String ^systemstring = gcnew String(orig);
systemstring += " (System::String)";
Console::WriteLine("{0}", systemstring);
delete systemstring;
}

輸出

Hello, World! (CString)
Hello, World! (char *)
Hello, World! (wchar_t *)
Hello, World! (_bstr_t)
Hello, World! (CComBSTR)
Hello, World! (basic_string)
Hello, World! (System::String)

從 basic_string 轉(zhuǎn)換

示例

此示例演示如何從 basic_string 轉(zhuǎn)換為上面列出的其他字符串類型。

復(fù)制代碼

// convert_from_basic_string.cpp
// compile with: /clr /link comsuppw.lib

#include <iostream>
#include <stdlib.h>
#include <string>

#include "atlbase.h"
#include "atlstr.h"
#include "comutil.h"

using namespace std;
using namespace System;

int main()
{
string orig("Hello, World!");
cout << orig << " (basic_string)" << endl;

// Convert to a char*
const size_t newsize = 100;
char nstring[newsize];
strcpy_s(nstring, orig.c_str());
strcat_s(nstring, " (char *)");
cout << nstring << endl;

// Convert to a wchar_t*
// You must first convert to a char * for this to work.
size_t origsize = strlen(orig.c_str()) + 1;
size_t convertedChars = 0;
wchar_t wcstring[newsize];
mbstowcs_s(&convertedChars, wcstring, origsize, orig.c_str(), _TRUNCATE);
wcscat_s(wcstring, L" (wchar_t *)");
wcout << wcstring << endl;

// Convert to a _bstr_t
_bstr_t bstrt(orig.c_str());
bstrt += " (_bstr_t)";
cout << bstrt << endl;

// Convert to a CComBSTR
CComBSTR ccombstr(orig.c_str());
if (ccombstr.Append(L" (CComBSTR)") == S_OK)
{
CW2A printstr(ccombstr);
cout << printstr << endl;
}

// Convert to a CString
CString cstring(orig.c_str());
cstring += " (CString)";
cout << cstring << endl;

// Convert to a System::String
String ^systemstring = gcnew String(orig.c_str());
systemstring += " (System::String)";
Console::WriteLine("{0}", systemstring);
delete systemstring;
}

輸出

Hello, World! (basic_string)
Hello, World! (char *)
Hello, World! (wchar_t *)
Hello, World! (_bstr_t)
Hello, World! (CComBSTR)
Hello, World! (CString)
Hello, World! (System::String)

從 System::String 轉(zhuǎn)換

示例

此示例演示如何從 System.String 轉(zhuǎn)換為上面列出的其他字符串類型。

復(fù)制代碼

// convert_from_system_string.cpp
// compile with: /clr /link comsuppw.lib

#include <iostream>
#include <stdlib.h>
#include <string>

#include "atlbase.h"
#include "atlstr.h"
#include "comutil.h"
#include "vcclr.h"

using namespace std;
using namespace System;
using namespace System::Runtime::InteropServices;

int main()
{
String ^orig = gcnew String("Hello, World!");
Console::WriteLine("{0} (System::String)", orig);

pin_ptr<const wchar_t> wch = PtrToStringChars(orig);

// Convert to a char*
size_t origsize = wcslen(wch) + 1;
const size_t newsize = 100;
size_t convertedChars = 0;
char nstring[newsize];
wcstombs_s(&convertedChars, nstring, origsize, wch, _TRUNCATE);
strcat_s(nstring, " (char *)");
cout << nstring << endl;

// Convert to a wchar_t*
wchar_t wcstring[newsize];
wcscpy_s(wcstring, wch);
wcscat_s(wcstring, L" (wchar_t *)");
wcout << wcstring << endl;

// Convert to a _bstr_t
_bstr_t bstrt(wch);
bstrt += " (_bstr_t)";
cout << bstrt << endl;

// Convert to a CComBSTR
CComBSTR ccombstr(wch);
if (ccombstr.Append(L" (CComBSTR)") == S_OK)
{
CW2A printstr(ccombstr);
cout << printstr << endl;
}

// Convert to a CString
CString cstring(wch);
cstring += " (CString)";
cout << cstring << endl;

// Convert to a basic_string
wstring basicstring(wch);
basicstring += L" (basic_string)";
wcout << basicstring << endl;

delete orig;
}

輸出

Hello, World! (System::String)
Hello, World! (char *)
Hello, World! (wchar_t *)
Hello, World! (_bstr_t)
Hello, World! (CComBSTR)
Hello, World! (CString)
Hello, World! (basic_string)

轉(zhuǎn)載于:https://www.cnblogs.com/taoxu0903/archive/2008/10/31/1323860.html

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