Windows-classic-samples/Samples/XmlLiteNamespaceWriter2/cpp/XmlLiteNamespaceWriter2.cpp

//-----------------------------------------------------------------------
// This file is part of the Windows SDK Code Samples.
// 
// Copyright (C) Microsoft Corporation.  All rights reserved.
// 
// This source code is intended only as a supplement to Microsoft
// Development Tools and/or on-line documentation.  See these other
// materials for detailed information regarding Microsoft code samples.
// 
// THIS CODE AND INFORMATION ARE PROVIDED AS IS WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//-----------------------------------------------------------------------

#include <ole2.h>
#include <xmllite.h>
#include <stdio.h>

#pragma warning(disable : 4127)  // conditional expression is constant
#define CHKHR(stmt)             do { hr = (stmt); if (FAILED(hr)) goto CleanUp; } while(0)
#define HR(stmt)                do { hr = (stmt); goto CleanUp; } while(0)
#define SAFE_RELEASE(I)         do { if (I){ I->Release(); } I = NULL; } while(0)

//implement filestream that derives from IStream
class FileStream : public IStream
{
    FileStream(HANDLE hFile) 
    { 
        _refcount = 1; 
        _hFile = hFile;
    }

    ~FileStream() 
    { 
        if (_hFile != INVALID_HANDLE_VALUE)
        {
            ::CloseHandle(_hFile);
        }
    }

public:
    HRESULT static OpenFile(LPCWSTR pName, IStream ** ppStream, bool fWrite)
    {
        HANDLE hFile = ::CreateFileW(pName, fWrite ? GENERIC_WRITE : GENERIC_READ, FILE_SHARE_READ,
            NULL, fWrite ? CREATE_ALWAYS : OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

        if (hFile == INVALID_HANDLE_VALUE)
            return HRESULT_FROM_WIN32(GetLastError());
        
        *ppStream = new FileStream(hFile);
        
        if(*ppStream == NULL)
            CloseHandle(hFile);
            
        return S_OK;
    }

    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, __RPC__deref_out _Result_nullonfailure_ void __RPC_FAR *__RPC_FAR *ppvObject)
    {
        if (!ppvObject)
            return E_INVALIDARG;
        (*ppvObject) = NULL;

        if (iid == __uuidof(IUnknown)
            || iid == __uuidof(IStream)
            || iid == __uuidof(ISequentialStream))
        {
            *ppvObject = static_cast<IStream*>(this);
            AddRef();
            return S_OK;
        } else
            return E_NOINTERFACE; 
    }

    virtual ULONG STDMETHODCALLTYPE AddRef(void) 
    { 
        return (ULONG)InterlockedIncrement(&_refcount); 
    }

    virtual ULONG STDMETHODCALLTYPE Release(void) 
    {
        ULONG res = (ULONG) InterlockedDecrement(&_refcount);
        if (res == 0) 
            delete this;
        return res;
    }

    // ISequentialStream Interface
public:
    virtual HRESULT STDMETHODCALLTYPE Read(_Out_writes_bytes_to_(cb, *pcbRead) void* pv, _In_ ULONG cb, _Out_opt_ ULONG* pcbRead)
    {
        BOOL rc = ReadFile(_hFile, pv, cb, pcbRead, NULL);
        return (rc) ? S_OK : HRESULT_FROM_WIN32(GetLastError());
    }

    virtual HRESULT STDMETHODCALLTYPE Write(_In_reads_bytes_(cb) const void* pv, _In_ ULONG cb, _Out_opt_ ULONG* pcbWritten)
    {
        BOOL rc = WriteFile(_hFile, pv, cb, pcbWritten, NULL);
        return rc ? S_OK : HRESULT_FROM_WIN32(GetLastError());
    }

    // IStream Interface
public:
    virtual HRESULT STDMETHODCALLTYPE SetSize(ULARGE_INTEGER)
    { 
        return E_NOTIMPL;   
    }
    
    virtual HRESULT STDMETHODCALLTYPE CopyTo(_In_ IStream*, ULARGE_INTEGER, _Out_opt_ ULARGE_INTEGER*, _Out_opt_ ULARGE_INTEGER*) 
    { 
        return E_NOTIMPL;   
    }
    
    virtual HRESULT STDMETHODCALLTYPE Commit(DWORD)                                      
    { 
        return E_NOTIMPL;   
    }
    
    virtual HRESULT STDMETHODCALLTYPE Revert(void)                                       
    { 
        return E_NOTIMPL;   
    }
    
    virtual HRESULT STDMETHODCALLTYPE LockRegion(ULARGE_INTEGER, ULARGE_INTEGER, DWORD)              
    { 
        return E_NOTIMPL;   
    }
    
    virtual HRESULT STDMETHODCALLTYPE UnlockRegion(ULARGE_INTEGER, ULARGE_INTEGER, DWORD)            
    { 
        return E_NOTIMPL;   
    }
    
    virtual HRESULT STDMETHODCALLTYPE Clone(__RPC__deref_out_opt IStream **)
    { 
        return E_NOTIMPL;   
    }

    virtual HRESULT STDMETHODCALLTYPE Seek(LARGE_INTEGER liDistanceToMove, DWORD dwOrigin, _Out_opt_ ULARGE_INTEGER* lpNewFilePointer)
    { 
        DWORD dwMoveMethod;

        switch(dwOrigin)
        {
        case STREAM_SEEK_SET:
            dwMoveMethod = FILE_BEGIN;
            break;
        case STREAM_SEEK_CUR:
            dwMoveMethod = FILE_CURRENT;
            break;
        case STREAM_SEEK_END:
            dwMoveMethod = FILE_END;
            break;
        default:   
            return STG_E_INVALIDFUNCTION;
            break;
        }

        if (SetFilePointerEx(_hFile, liDistanceToMove, (PLARGE_INTEGER) lpNewFilePointer,
                             dwMoveMethod) == 0)
            return HRESULT_FROM_WIN32(GetLastError());
        return S_OK;
    }

    virtual HRESULT STDMETHODCALLTYPE Stat(__RPC__out STATSTG* pStatstg, DWORD )
    {
        if (GetFileSizeEx(_hFile, (PLARGE_INTEGER) &pStatstg->cbSize) == 0)
            return HRESULT_FROM_WIN32(GetLastError());
        return S_OK;
    }

private:
    HANDLE _hFile;
    LONG _refcount;
};

int __cdecl wmain(int argc, _In_reads_(argc) WCHAR* argv[])
{
    HRESULT hr = S_OK;
    IStream *pOutFileStream = NULL;
    IXmlWriter *pWriter = NULL;

    if (argc != 2)
    {
        printf("Usage: XmlLiteNamespaceWriter2.exe name-of-output-file\n");
        return 0;
    }

    //Open writeable output stream
    if (FAILED(hr = FileStream::OpenFile(argv[1], &pOutFileStream, TRUE)))
    {
        wprintf(L"Error creating file writer, error is %08.8lx", hr);
        HR(hr);
    }

    if (FAILED(hr = CreateXmlWriter(__uuidof(IXmlWriter),(void**) &pWriter, NULL)))
    {
        wprintf(L"Error creating xml writer, error is %08.8lx", hr);
        HR(hr);
    }

    if (FAILED(hr = pWriter->SetOutput(pOutFileStream)))
    {
        wprintf(L"Error setting output for writer, error is %08.8lx", hr);
        HR(hr);
    }

    if (FAILED(hr = pWriter->SetProperty(XmlWriterProperty_Indent, TRUE)))
    {
        wprintf(L"Error, Method: SetProperty, XmlWriterProperty_Indent, error is %08.8lx", hr);
        HR(hr);
    }

    if (FAILED(hr = pWriter->WriteStartDocument(XmlStandalone_Omit)))
    {
        wprintf(L"Error, Method: WriteStartDocument, error is %08.8lx", hr);
        HR(hr);
    }

    const WCHAR * prefix = L"";
    //const WCHAR * prefix = NULL;   // this also works
    const WCHAR * uri = L"urn:abc";

    if (FAILED(hr = pWriter->WriteStartElement(prefix, L"root", uri)))
    {
        wprintf(L"Error, Method: WriteStartElement, error is %08.8lx", hr);
        HR(hr);
    }
    if (FAILED(hr = pWriter->WriteStartElement(prefix, L"sub", uri)))
    {
        wprintf(L"Error, Method: WriteStartElement, error is %08.8lx", hr);
        HR(hr);
    }
    if (FAILED(hr = pWriter->WriteAttributeString(prefix, L"myAttr", uri, L"1234")))
    {
        wprintf(L"Error, Method: WriteAttributeString, error is %08.8lx", hr);
        HR(hr);
    }
    if (FAILED(hr = pWriter->WriteFullEndElement()))
    {
        wprintf(L"Error, Method: WriteFullEndElement, error is %08.8lx", hr);
        HR(hr);
    }
    if (FAILED(hr = pWriter->WriteFullEndElement()))
    {
        wprintf(L"Error, Method: WriteFullEndElement, error is %08.8lx", hr);
        HR(hr);
    }

CleanUp:
    SAFE_RELEASE(pOutFileStream);
    SAFE_RELEASE(pWriter);
    return hr;
}