isam.cpp

本程序可在C环境下显示一幅或多幅图片

// ISAM.CPP - Implementation file for your Internet Server
//    ISAM Extension

#include "stdafx.h"
#include "binhtmstream.h"
#include "ISAM.h"

///////////////////////////////////////////////////////////////////////
// The one and only CWinApp object
// NOTE: You may remove this object if you alter your project to no
// longer use MFC in a DLL.

CWinApp theApp;

///////////////////////////////////////////////////////////////////////
// command-parsing map

BEGIN_PARSE_MAP(CISAMExtension, CHttpServer)
	// TODO: insert your ON_PARSE_COMMAND() and 
	// ON_PARSE_COMMAND_PARAMS() here to hook up your commands.
	// For example:

	ON_PARSE_COMMAND(Default, CISAMExtension, ITS_EMPTY)
	DEFAULT_PARSE_COMMAND(Default, CISAMExtension)
	ON_PARSE_COMMAND(GetImage, CISAMExtension, ITS_EMPTY)
END_PARSE_MAP(CISAMExtension)


///////////////////////////////////////////////////////////////////////
// The one and only CISAMExtension object

CISAMExtension theExtension;

static const UINT nIDHTMLType = 23;
// put your location here, or load from registry to avoid recompiling
static const TCHAR szLocation[] = _T("http://localhost/isapitest/isam.dll");
// put your image location here, or load from registry to avoid recompiling
static const TCHAR szImageLocation[] = _T("D:\\isapitest\\image\\car1.jpg");

///////////////////////////////////////////////////////////////////////
// CISAMExtension implementation

CISAMExtension::CISAMExtension()
{
}

CISAMExtension::~CISAMExtension()
{
}

BOOL CISAMExtension::GetExtensionVersion(HSE_VERSION_INFO* pVer)
{
	// Call default implementation for initialization
	CHttpServer::GetExtensionVersion(pVer);

	// Load description string
	TCHAR sz[HSE_MAX_EXT_DLL_NAME_LEN+1];
	ISAPIVERIFY(::LoadString(AfxGetResourceHandle(), IDS_SERVER, sz, HSE_MAX_EXT_DLL_NAME_LEN));
	_tcscpy(pVer->lpszExtensionDesc, sz);
	return TRUE;
}

BOOL CISAMExtension::LoadLongResource(CString& str, UINT nID)
{
	HRSRC hRes;
	HINSTANCE hInst = AfxGetResourceHandle();
	BOOL bResult = FALSE;
	
	hRes = FindResource(hInst, MAKEINTRESOURCE(nID), (LPCTSTR)nIDHTMLType);
	if (hRes == NULL)
		ISAPITRACE1("Error: Resource %d could not be found\r\n", nID);
	else
	{
		DWORD dwSize = SizeofResource(hInst, hRes);
		if (dwSize == 0)
		{
			str.Empty();
			bResult = TRUE;
		}
		else
		{
			LPTSTR pszStorage = str.GetBufferSetLength(dwSize);

			HGLOBAL hGlob = LoadResource(hInst, hRes);
			if (hGlob != NULL)
			{
				LPVOID lpData = LockResource(hGlob);

				if (lpData != NULL)
				{
					memcpy(pszStorage, lpData, dwSize);
					bResult = TRUE;
				}

				FreeResource(hGlob);
			}
		}
	}

#ifdef _DEBUG
	if (!bResult)
		str.Format(_T("<b>Could not find string %d</b>"), nID);
#endif

	return bResult;
}

void CISAMExtension::OutputJpeg(CHttpServerContext* pCtxt, const CByteArray& data)
{
	// Start by writing the proper content type to the client
	AddHeader(pCtxt, _T("Content-Type: image/jpeg\r\n"));
	char szBuff[50];
	int nSize = data.GetSize();
	wsprintf(szBuff, "Content-length: %ld\r\n", nSize);
	AddHeader(pCtxt, szBuff);

	CBinaryHtmlStream* pStream = new CBinaryHtmlStream;
	ISAPIVERIFY(pStream != NULL);

	for (int nCount = 0; nCount<nSize; nCount++)
		*pStream << data[nCount];

	*pCtxt << *pStream;

	delete pStream;
}

///////////////////////////////////////////////////////////////////////
// CISAMExtension command handlers

void CISAMExtension::Default(CHttpServerContext* pCtxt)
{
	CString strImageRef = CString(szLocation) + CString(_T("?")) + CString(_T("GetImage"));
	CString strOutput;
	CString strResource;
	LoadLongResource(strResource, IDR_DATA);
	strOutput.Format(strResource, strImageRef);
	*pCtxt << strOutput;
}

void CISAMExtension::GetImage(CHttpServerContext* pCtxt)
{
	try
	{
		CFile imageFile(szImageLocation, CFile::modeRead);
		DWORD dwLength = imageFile.GetLength();
		CByteArray data;
		data.SetSize(dwLength);
		imageFile.Read(data.GetData(), dwLength);
		OutputJpeg(pCtxt, data);
	}
	catch (CFileException* e)
	{
		e->Delete();
	}
	catch (CMemoryException* e)
	{
		 e->Delete();
	}
}

// Do not edit the following lines, which are needed by ClassWizard.
#if 0
BEGIN_MESSAGE_MAP(CISAMExtension, CHttpServer)
	//{{AFX_MSG_MAP(CISAMExtension)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()
#endif	// 0



///////////////////////////////////////////////////////////////////////
// If your extension will not use MFC, you'll need this code to make
// sure the extension objects can find the resource handle for the
// module.  If you convert your extension to not be dependent on MFC,
// remove the comments arounn the following AfxGetResourceHandle()
// and DllMain() functions, as well as the g_hInstance global.

/****

static HINSTANCE g_hInstance;

HINSTANCE AFXISAPI AfxGetResourceHandle()
{
	return g_hInstance;
}

BOOL WINAPI DllMain(HINSTANCE hInst, ULONG ulReason,
					LPVOID lpReserved)
{
	if (ulReason == DLL_PROCESS_ATTACH)
	{
		g_hInstance = hInst;
	}

	return TRUE;
}

****/