BSTR是什么类型，在VC++.NET调用WEBSERVICE的方法时，string与BSTR如何转化

[webjimcn]

webservice 用C#写成，client端用VC++.net写,在VC++.NET调用WEBSERVICE的方法时，string与BSTR如何转化，本来是string method(string,string),引用后，却变成了BSTR.string与BSTR如何转化

[真相重于对错]

using CONVERTION;
BSTR bstr;
char* tstr = b2t(bstr);
bstr = T2B( tstr );

[wangxt]

帮你顶

[Tomgus]

http://dev.csdn.net/article/35/35969.shtm

[Little_Ghost]

CSring str = "This is a string";
BSTR bstr = str.AllocSys...();//(具体记不清，应该是点出来的第一个函数)

CString str2 = (CString)bstr;//能够直接强制转换

[蒋晟]

// MarshalBSTR1.cpp
// compile with: /clr
#define WINVER 0x0502
#define _AFXDLL
#include <afxwin.h>

#include <iostream>
using namespace std;

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

#pragma unmanaged

void NativeTakesAString(BSTR bstr)
{
printf_s("%S", bstr);
}

#pragma managed

int main()
{
String^ s = "test string";

IntPtr ip = Marshal::StringToBSTR(s);
BSTR bs = static_cast<BSTR>(ip.ToPointer());
pin_ptr<BSTR> b = &bs;

NativeTakesAString( bs );

Marshal::FreeBSTR(ip);

return 0;
}
// MarshalBSTR2.cpp
// compile with: /clr
#define WINVER 0x0502
#define _AFXDLL
#include <afxwin.h>

#include <iostream>
using namespace std;

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

#pragma managed

void ManagedTakesAString(BSTR bstr)
{
String^ s = Marshal::PtrToStringBSTR(static_cast<IntPtr>(bstr));
Console::WriteLine("(managed) convered BSTR to String: '{0}'", s);
}

#pragma unmanaged

void UnManagedFunc()
{
BSTR bs = SysAllocString(L"test string");
printf_s("(unmanaged) passing BSTR to managed func...\n");
ManagedTakesAString(bs);
}

#pragma managed

int main()
{
UnManagedFunc();
return 0;
}

[蒋晟]

// MarshalBSTR1.cpp
// compile with: /clr
#define WINVER 0x0502
#define _AFXDLL
#include <afxwin.h>

#include <iostream>
using namespace std;

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

#pragma unmanaged

void NativeTakesAString(BSTR bstr)
{
printf_s("%S", bstr);
}

#pragma managed

int main()
{
String^ s = "test string";

IntPtr ip = Marshal::StringToBSTR(s);
BSTR bs = static_cast<BSTR>(ip.ToPointer());
pin_ptr<BSTR> b = &bs;

NativeTakesAString( bs );

Marshal::FreeBSTR(ip);

return 0;
}
// MarshalBSTR2.cpp
// compile with: /clr
#define WINVER 0x0502
#define _AFXDLL
#include <afxwin.h>

#include <iostream>
using namespace std;

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

#pragma managed

void ManagedTakesAString(BSTR bstr)
{
String^ s = Marshal::PtrToStringBSTR(static_cast<IntPtr>(bstr));
Console::WriteLine("(managed) convered BSTR to String: '{0}'", s);
}

#pragma unmanaged

void UnManagedFunc()
{
BSTR bs = SysAllocString(L"test string");
printf_s("(unmanaged) passing BSTR to managed func...\n");
ManagedTakesAString(bs);
}

#pragma managed

int main()
{
UnManagedFunc();
return 0;
}

[真相重于对错]

vc++ 2005 ???