C / C++ / MFC

<br />
CFile file( /* ... */ );<br />
CArchive ar( &file, /* ... */ );<br />
CArchiveStream arStm( &ar );<br />
<br />
IStream* pStm = &arStm;<br />
<br />
/* Use pStm */<br />

<br />
Image* SerializeImage(CArchive&, Image*)<br />
{<br />
	DWORD sizeOfStream;<br />
	CFileException* pMemFileError = NULL;<br />
	LPBYTE pMemSpace = NULL;<br />
	DWORD dwPos;<br />
<br />
	CLSID jpgClsid;<br />
	GetEncoderClsid(L"image/jpeg", &jpgClsid);<br />
<br />
	// create a memory file<br />
	COleStreamFile pMemFile;<br />
	if(!pMemFile.CreateMemoryStream(pMemFileError))<br />
		throw pMemFileError;<br />
<br />
	ar.Flush();<br />
	dwPos = ar.GetFile()->GetPosition();<br />
	<br />
	// loadin/storing<br />
	if(ar.IsStoring())<br />
	{<br />
		TRACE("Starts storing Image contents -- pos = %d\n", dwPos);<br />
<br />
		// stream the logo to memoryfile<br />
		pImage->Save(pMemFile.GetStream(),&jpgClsid);<br />
		<br />
		// get the size of the memoryfile<br />
		sizeOfStream = pMemFile.GetLength();<br />
			<br />
		// allocate memory with that size<br />
		pMemSpace = (LPBYTE)CoTaskMemAlloc(sizeOfStream);<br />
<br />
		// set filepointer to beginning of file <br />
		pMemFile.SeekToBegin();<br />
		// read memoryfile contents into memorybuffer<br />
		// and set the sizeofstream to the actual butes read from the stream<br />
		sizeOfStream = pMemFile.Read(pMemSpace,sizeOfStream);<br />
<br />
		// write size to archive <br />
		ar << sizeOfStream;<br />
		// write memorybuffer to archive<br />
		ar.Write(pMemSpace, sizeOfStream);	<br />
		<br />
		dwPos = ar.GetFile()->GetPosition();<br />
		TRACE("Image storing complete -- pos = %d\n", dwPos);<br />
	}<br />
	else // loading<br />
	{<br />
		// get size of image from the archive<br />
		ar >> sizeOfStream;<br />
<br />
		// allocate memory buffer with that size<br />
		pMemSpace = (LPBYTE)CoTaskMemAlloc(sizeOfStream);<br />
<br />
		// read bytes from archive into mem buffer<br />
		ar.Read(pMemSpace, sizeOfStream);<br />
		<br />
		// stream butter into the memoryfile<br />
		pMemFile.Write(pMemSpace, sizeOfStream);<br />
<br />
		// pass the stream to Image::FromStream(...)<br />
		pImage = Image::FromStream(pMemFile.GetStream()); <br />
	<br />
<br />
		// diagnostics<br />
		dwPos = ar.GetFile()->GetPosition();<br />
		if(pImage->GetLastStatus() != Ok)<br />
		{<br />
			AfxMessageBox(	"Misslyckades att läsa in logotype till försättsblad",<br />
							MB_ICONEXCLAMATION);<br />
			delete pImage;<br />
			pImage = NULL;<br />
			TRACE("Image loading failed!! -- pos = %d\n", dwPos);<br />
		}<br />
		else<br />
			TRACE("Image loading complete -- pos = %d\n", dwPos);<br />
	}<br />
	<br />
	// free memory and close memoryfile<br />
	CoTaskMemFree(pMemSpace);<br />
	pMemFile.Close();<br />
	return pImage;<br />
}<br />

class CMyConnection
{
:
};

namespace MYAPI 
{
  class CMyConnection
  {
  :
  };
}

void somefunc()
{
    // which one do you get?  you get the first declaration because you are using "global "scope"
 CMyConnection conn;  

    // now this will get you the second
  MYAPI::CMyConnection conn;

}

int main()
{
  vector v;  // instead of std::vector v;
  :
  :
}

#include <stl.h>

class vector 
{
:
};

int main()
{
  vector v;
  :
}

using mysqlcppapi::Connection;<br />
<br />
Connection con; // con is a mysqlcppapi::Connection

using namespace mysqlcppapi;<br />
using namespace myOtherNamespace;