InetHttpSendForm example for C++ 5.0 and later

Take the following steps to use HTTP features to your application:

1.	Start with a copy of the project that you created in Loading and Displaying an Image
	Note: This example changes the initialization of the window; so using a copy of the original project prevents problems with later reuse of the original project.

2.	Add #import and #include statements to your program so you can access the LEAD COM constants and classes:
	a.	In the Project Workspace, click the FileView tab.
	b.	Double-click the tutor files folder to open it.
	c.	Double-click the Header Files folder to open it.
	d.	Double-click the StdAfx.h file to edit it.
	e.	Add the following line to the end of the file (keep in mind, you may have to change the path to where the DLL resides):

#import "c:\\winnt\\system32\\LTRVR14N.dll" no_namespace, named_guids
#import "c:\\winnt\\system32\\LTRHT14N.dll" no_namespace, named_guids

3.	Edit the TUTORDLG.H file and change the definition of CTutorDlg : CDialog by inserting the following lines after DECLARE_MESSAGE_MAP:

public:
ILEADRasterHTTP *m_pRasterHTTP;

4.	Edit the TutorDlg.cpp file and add the following code to the end of the OnInitDialog function (just before return TRUE):

//Create the RasterHTTP object
CoCreateInstance(CLSID_LEADRasterHTTP, NULL, CLSCTX_ALL, IID_ILEADRasterHTTP, (void**)&m_pRasterHTTP);

5.	Press Ctrl-W to go to the MFC Class Wizard; then do the following:
	a.	In the Class name combo box, select CTutorDlg.
	b.	In the Object IDs list box, select CTutorDlg.
	c.	In the Messages list box, select WM_DESTROY.
	d.	Click the Add function button. Choose OK for the default function name (OnDestroy).
	e.	Click the Edit Code button to start entering the code.
6.	Enter new code as follows (just before the CDialog::OnDestroy call):

void CTutorDlg::OnDestroy()
{
m_pRasterHTTP->Release();
CDialog::OnDestroy();
}

7.	Add a command buttons to the Tutor dialog and name it as follows:
	ID		Caption
	IDC_HTTP_FORM		HTTP Form
8.	Press Ctrl-W to go to the MFC Class Wizard; then do the following:
	a.	Click the Message Maps tab.
	b.	In the Class Name combo box, select CTutorDlg.
	c.	In the Object IDs list box, select IDC_HTTP_FORM.
	d.	In the Messages list box, select BN_CLICKED.
	e.	Click the Add function button. Choose OK for the default function name (OnHttpForm).
	f.	Click the Edit Code button and enter the following code: (you will have to change the IP address to a valid server name or address)

void CTutorDlg::OnHttpForm()
{
   short nRet;
   long nStatus;
   nRet = m_pRasterHTTP->InetHttpConnect("demo.leadtools.com", 80, "", "");
   if(nRet == 0)
   {
      nRet = m_pRasterHTTP->InetHttpOpenRequest(HTTP_RQST_POST, "/com/tutorial/http/form.asp", "", "HTTP/1.0");
      if(nRet == 0)
      {
         m_pRasterHTTP->InetHttpFormValueCount = 2;
         m_pRasterHTTP->InetHttpFormValues[0]->pszName = "email";
         m_pRasterHTTP->InetHttpFormValues[0]->pszValue = TEXT("myemail@mydomain.com");
         m_pRasterHTTP->InetHttpFormValues[1]->pszName = TEXT("name");
         m_pRasterHTTP->InetHttpFormValues[1]->pszValue = TEXT("First Last");
         nRet = m_pRasterHTTP->InetHttpSendForm();
         if(nRet != 0)
         {
            AfxMessageBox(TEXT("Error Sending Form"));
            m_pRasterHTTP->InetHttpCloseRequest();
            m_pRasterHTTP->InetHttpDisconnect();
            return;
         }
         m_pRasterHTTP->InetHttpGetServerStatus(&nStatus);
         if(nStatus == HTTP_STATUS_OK)
         {
            FILE * fp = _topen(TEXT("c:\\output.htm"), TEXT("wb"));
            if(fp)
            {
               _bstr_t szResponse = m_pRasterHTTP->InetHttpGetResponse();
               fwrite((TCHAR *)szResponse, szResponse.length(), 1, fp);
               fclose(fp);
            }
         }
         else
         {
            AfxMessageBox(TEXT("Problem With Server"));
         }
         m_pRasterHTTP->InetHttpCloseRequest();
         m_pRasterHTTP->InetHttpDisconnect();
      }
   }
}

9.	Rebuild and run the application.