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如何：在各种字符串类型之间进行转换

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

从 char * 转换

示例

此示例演示如何从 char * 转换为上面列出的其他字符串类型。

// 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;

        }

输出

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)

从 wchar_t * 转换

示例

此示例演示如何从 wchar_t * 转换为上面列出的其他字符串类型。

复制代码

// 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;

        }

输出

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)

从 _bstr_t 转换

示例

此示例演示如何从 _bstr_t 转换为上面列出的其他字符串类型。

复制代码

// 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;

        }

输出

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)

从 CComBSTR 转换

示例

此示例演示如何从 CComBSTR 转换为上面列出的其他字符串类型。

复制代码

// 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;

        }

输出

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)

从 CString 转换

示例

此示例演示如何从 CString 转换为上面列出的其他字符串类型。

复制代码

// 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;

        }

输出

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)

从 basic_string 转换

示例

此示例演示如何从 basic_string 转换为上面列出的其他字符串类型。

复制代码

// 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;

        }

输出

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)

从 System::String 转换

示例

此示例演示如何从 System.String 转换为上面列出的其他字符串类型。

复制代码

// 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;

        }

输出

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)

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原文地址：https://www.cnblogs.com/taoxu0903/p/1323860.html