问题
I'm trying to put class NativeBuffer from this answer but when windows.storage.streams.h I have much errors like:
Error 1 error C2872: 'AsyncStatus' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\asyncinfo.h 75
Error 2 error C2872: 'AsyncStatus' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\asyncinfo.h 76
Error 3 error C2872: 'AsyncStatus' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\asyncinfo.h 77
Error 4 error C2872: 'AsyncStatus' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\asyncinfo.h 78
Error 5 error C2371: 'IAsyncInfo' : redefinition; different basic types c:\program files (x86)\windows phone kits\8.0\include\abi\asyncinfo.h 108
Error 6 error C2872: 'AsyncStatus' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\asyncinfo.h 115
Error 7 error C2872: 'EventRegistrationToken' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\windows.foundation.collections.h 1185
Error 8 error C2872: 'EventRegistrationToken' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\windows.foundation.collections.h 1186
Error 9 error C2872: 'EventRegistrationToken' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\windows.foundation.collections.h 1224
Error 10 error C2872: 'EventRegistrationToken' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\windows.foundation.collections.h 1225
Error 11 error C3431: 'PropertyType' : a scoped enumeration cannot be redeclared as an unscoped enumeration c:\program files (x86)\windows phone kits\8.0\include\abi\windows.foundation.h 3984
Error 12 error C2371: 'ABI::Windows::Foundation::PropertyType' : redefinition; different basic types c:\program files (x86)\windows phone kits\8.0\include\abi\windows.foundation.h 15298
Error 13 error C2872: 'EventRegistrationToken' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\windows.storage.search.h 4005
Error 14 error C2872: 'EventRegistrationToken' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\windows.storage.search.h 4008
Error 15 error C2872: 'EventRegistrationToken' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\windows.storage.search.h 4012
Error 16 error C2872: 'EventRegistrationToken' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\windows.storage.search.h 4015
Error 17 error C2872: 'EventRegistrationToken' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\windows.storage.h 10488
Error 18 error C2872: 'EventRegistrationToken' : ambiguous symbol c:\program files (x86)\windows phone kits\8.0\include\abi\windows.storage.h 10491
Error 19 error C2039: 'RuntimeClass' : is not a member of 'Microsoft::WRL' c:\users\sergey.fedortsov\documents\socialholdem\prj.ipoker\wp8\shared\platform\wp\nativebuffer.h 12
Error 20 error C2504: 'RuntimeClass' : base class undefined c:\users\sergey.fedortsov\documents\socialholdem\prj.ipoker\wp8\shared\platform\wp\nativebuffer.h 12
Error 21 error C2143: syntax error : missing ',' before '<' c:\users\sergey.fedortsov\documents\socialholdem\prj.ipoker\wp8\shared\platform\wp\nativebuffer.h 12
Error 22 error C2039: 'RuntimeClassFlags' : is not a member of 'Microsoft::WRL' c:\users\sergey.fedortsov\documents\socialholdem\prj.ipoker\wp8\shared\platform\wp\nativebuffer.h 13
Error 23 error C3083: 'RuntimeClassType': the symbol to the left of a '::' must be a type c:\users\sergey.fedortsov\documents\socialholdem\prj.ipoker\wp8\shared\platform\wp\nativebuffer.h 13
Error 24 error C2039: 'WinRtClassicComMix' : is not a member of 'Microsoft::WRL' c:\users\sergey.fedortsov\documents\socialholdem\prj.ipoker\wp8\shared\platform\wp\nativebuffer.h 13
Error 25 error C2039: 'FtmBase' : is not a member of 'Microsoft::WRL' c:\users\sergey.fedortsov\documents\socialholdem\prj.ipoker\wp8\shared\platform\wp\nativebuffer.h 16
My code:
#ifndef NATIVE_BUFFER_H
#define NATIVE_BUFFER_H
#include <robuffer.h>
#include <wrl.h>
#include <wrl/implements.h>
#include <wrl\client.h>
#include <windows.storage.streams.h>
/// <summary>
/// The purpose of this class is to transform byte buffers into an IBuffer
/// </summary>
class NativeBuffer : public Microsoft::WRL::RuntimeClass<
Microsoft::WRL::RuntimeClassFlags< Microsoft::WRL::RuntimeClassType::WinRtClassicComMix >,
ABI::Windows::Storage::Streams::IBuffer,
Windows::Storage::Streams::IBufferByteAccess,
Microsoft::WRL::FtmBase>
{
public:
virtual ~NativeBuffer()
{
if (m_pBuffer && m_bIsOwner)
{
delete[] m_pBuffer;
m_pBuffer = NULL;
}
}
STDMETHODIMP RuntimeClassInitialize(UINT totalSize)
{
m_uLength = totalSize;
m_uFullSize = totalSize;
m_pBuffer = new BYTE[totalSize];
m_bIsOwner = TRUE;
return S_OK;
}
STDMETHODIMP RuntimeClassInitialize(BYTE* pBuffer, UINT totalSize, BOOL fTakeOwnershipOfPassedInBuffer)
{
m_uLength = totalSize;
m_uFullSize = totalSize;
m_pBuffer = pBuffer;
m_bIsOwner = fTakeOwnershipOfPassedInBuffer;
return S_OK;
}
STDMETHODIMP Buffer( BYTE **value)
{
*value = m_pBuffer;
return S_OK;
}
STDMETHODIMP get_Capacity(UINT32 *value)
{
*value = m_uFullSize;
return S_OK;
}
STDMETHODIMP get_Length(UINT32 *value)
{
*value = m_uLength;
return S_OK;
}
STDMETHODIMP put_Length(UINT32 value)
{
if(value > m_uFullSize)
{
return E_INVALIDARG;
}
m_uLength = value;
return S_OK;
}
static Windows::Storage::Streams::IBuffer^ GetIBufferFromNativeBuffer(Microsoft::WRL::ComPtr<NativeBuffer> spNativeBuffer)
{
auto iinspectable = reinterpret_cast<IInspectable*>(spNativeBuffer.Get());
return reinterpret_cast<Windows::Storage::Streams::IBuffer^>(iinspectable);
}
static BYTE* GetBytesFromIBuffer(Windows::Storage::Streams::IBuffer^ buffer)
{
auto iinspectable = (IInspectable*)reinterpret_cast<IInspectable*>(buffer);
Microsoft::WRL::ComPtr<Windows::Storage::Streams::IBufferByteAccess> spBuffAccess;
HRESULT hr = iinspectable->QueryInterface(__uuidof(Windows::Storage::Streams::IBufferByteAccess), (void **)&spBuffAccess);
UCHAR * pReadBuffer;
spBuffAccess->Buffer(&pReadBuffer);
return pReadBuffer;
}
private:
UINT32 m_uLength;
UINT32 m_uFullSize;
BYTE* m_pBuffer;
BOOL m_bIsOwner;
};
#endif
What can be reason of this?
回答1:
Most probable reason is that you are using namespace in header file!
Eg.
// Header
using namespace System;
using namespace std;
// Your class declaration
Remove all namespace inclusion from headers. Use explicit class inclusion, like
using System::Int32;
using std::vector;
Since you include this header in some other header, and then include standard headers - everything goes into (or is treated into) global namespace. It raises ambiguity. You cannot change the standard header(s) (by prefixing ::, or some other namespace).
来源：https://stackoverflow.com/questions/15767146/including-windows-storage-streams-h