[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。

复制代码 
// 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 CComBSTRCComBSTR ccombstr(orig);if (ccombstr.Append(L" (CComBSTR)") == S_OK){CW2A printstr(ccombstr);cout << printstr << endl;}

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

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

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

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

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

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

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

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

// Convert to a System::StringString ^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 CStringCString cstring(orig);cstring += " (CString)";cout << cstring << endl;

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

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

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

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

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

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

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

// Convert to a basic_stringwstring 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)

转载于:https://www.cnblogs.com/taoxu0903/archive/2008/10/31/1323860.html

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