InternetRequest Class Reference

Class for requesting data from an internet server via HTTP. More...

#include <InternetRequest.h>

Classes
struct	RequestData
	Structure for holding request information; used mostly for requests on a worker thread. More...
Public Member Functions
	InternetRequest ()
	Constructor.
	~InternetRequest ()
	Destructor.
const std::tstring &	GetError ()
	Retrieves the last error string.
bool	DoRequest (const std::tstring &sRequest, InternetRequestBuffer &buffer, LPCTSTR lpServer=NULL, LPCSTR lpOptional=NULL, LPCTSTR lpHeaders=NULL, ProgressInterface *pProgress=&gpiDefault)
	Runs an internet request and returns when it is finished.
bool	DoRequestThread (const std::tstring &sRequest, InternetRequestBuffer &buffer, LPCTSTR lpServer=NULL, LPCSTR lpOptional=NULL, LPCTSTR lpHeaders=NULL, ProgressInterface *pProgress=&gpiDefault)
	Runs an internet request in a worker thread and returns immediatly.
Protected Member Functions
void	OnInternetCallback (DWORD dwInternetStatus, LPVOID lpvStatusInformation, DWORD dwStatusInformationLength)
	Called when the request changes status.
bool	OpenSession ()
	Opens a wininet session.
void	CloseAll ()
	Closes all wininet handles.
bool	DoRequest (RequestData *pData)
	Runs the request and calles the progress interface when it is finished.
bool	InnerDoRequest (RequestData *pData)
	Runs the request (does the actual work).
Static Protected Member Functions
static void __stdcall	InternetCallback (HINTERNET hInternet, DWORD_PTR dwContext, DWORD dwInternetStatus, LPVOID lpvStatusInformation, DWORD dwStatusInformationLength)
	Callback for wininet status changes.
static DWORD WINAPI	RequestThreadProc (LPVOID lpData)
	The request worker thread main function.
Protected Attributes
HINTERNET	m_hSession
	The wininet session object.
HINTERNET	m_hConnection
	The wininet connection object (reused for each different server).
HINTERNET	m_hRequest
	The wininet current request (reused for each request).
bool	m_bInRequest
	true if currently in a request, false if not
bool	m_bInCreation
	true while creating a connection, false if not
std::tstring	m_sServer
	Name of server used for the current connection.
std::tstring	m_sError
	Last error for the request.

Detailed Description

Class for requesting data from an internet server via HTTP.

Definition at line 81 of file InternetRequest.h.

Member Function Documentation

bool InternetRequest::DoRequest ( RequestData * pData ) [protected]

Runs the request and calles the progress interface when it is finished.

Parameters:

pData

Pointer to the request data structure

Returns:: true if request returned the data, false if failed

Definition at line 295 of file InternetRequest.cpp.

References InnerDoRequest(), InternetRequest::RequestData::m_pProgress, and ProgressInterface::OnFinished().

bool InternetRequest::DoRequest	(	const std::tstring &	sRequest,
		InternetRequestBuffer &	buffer,
		LPCTSTR	lpServer = `NULL`,
		LPCSTR	lpOptional = `NULL`,
		LPCTSTR	lpHeaders = `NULL`,
		ProgressInterface *	pProgress = `&gpiDefault`
	)

Runs an internet request and returns when it is finished.

Parameters:

	sRequest	The page requested from the server
	buffer	Buffer object to fill with the request response
	lpServer	Server name (can be NULL; if so, will use the current connection if any or fail if there is none)
	lpOptional	Additional data for POST (can be NULL)
	lpHeaders	Additional headers (can be NULL)
	pProgress	Pointer to the progress interface (can be NULL)

Returns:: true if the request was successful, false if failed

Definition at line 240 of file InternetRequest.cpp.

Referenced by RequestThreadProc().

bool InternetRequest::DoRequestThread	(	const std::tstring &	sRequest,
		InternetRequestBuffer &	buffer,
		LPCTSTR	lpServer = `NULL`,
		LPCSTR	lpOptional = `NULL`,
		LPCTSTR	lpHeaders = `NULL`,
		ProgressInterface *	pProgress = `&gpiDefault`
	)

Runs an internet request in a worker thread and returns immediatly.

Parameters:

	sRequest	The page requested from the server
	buffer	Buffer object to fill with the request response
	lpServer	Server name (can be NULL; if so, will use the current connection if any or fail if there is none)
	lpOptional	Additional data for POST (can be NULL)
	lpHeaders	Additional headers (can be NULL)
	pProgress	Pointer to the progress interface (can be NULL)

Returns:: true if the request worker thread started, false if it failed to start

Definition at line 257 of file InternetRequest.cpp.

References m_sError, and RequestThreadProc().

Referenced by CCPrintProgressDlg::PageProc().

const std::tstring& InternetRequest::GetError ( ) [inline]

Retrieves the last error string.

Returns:: The last error string

Definition at line 151 of file InternetRequest.h.

References m_sError.

bool InternetRequest::InnerDoRequest ( RequestData * pData ) [protected]

Runs the request (does the actual work).

Parameters:

pData

Pointer to the request data structure

Returns:: true if request returned the data, false if failed

Definition at line 311 of file InternetRequest.cpp.

References InternetRequestBuffer::AddData(), ProgressInterface::GetCancel(), m_bInCreation, m_hConnection, m_hRequest, m_hSession, InternetRequest::RequestData::m_pBuffer, InternetRequest::RequestData::m_pProgress, m_sError, InternetRequest::RequestData::m_sHeaders, InternetRequest::RequestData::m_sOptional, InternetRequest::RequestData::m_sRequest, m_sServer, InternetRequest::RequestData::m_sServer, and OpenSession().

Referenced by DoRequest().

void __stdcall InternetRequest::InternetCallback	(	HINTERNET	hInternet,
		DWORD_PTR	dwContext,
		DWORD	dwInternetStatus,
		LPVOID	lpvStatusInformation,
		DWORD	dwStatusInformationLength
	)			`[static, protected]`

Callback for wininet status changes.

Parameters:

	hInternet	Handle to the wininet object that requested the callback
	dwContext	Client-defined data (the pointer to the InternetRequest object, in our case)
	dwInternetStatus	Callback stauts
	lpvStatusInformation	Pointer to additional callback information
	dwStatusInformationLength	Size of information object

Definition at line 182 of file InternetRequest.cpp.

References OnInternetCallback().

Referenced by OpenSession().

void InternetRequest::OnInternetCallback	(	DWORD	dwInternetStatus,
		LPVOID	lpvStatusInformation,
		DWORD	dwStatusInformationLength
	)			`[protected]`

Called when the request changes status.

Parameters:

	dwInternetStatus	Callback status
	lpvStatusInformation	Pointer to additional callback information
	dwStatusInformationLength	Size of information object

Definition at line 195 of file InternetRequest.cpp.

References m_bInCreation, m_bInRequest, and m_sError.

Referenced by InternetCallback().

bool InternetRequest::OpenSession ( ) [protected]

Opens a wininet session.