C / C++ / MFC

Re: Question about connection with FTP server ( What wrong with my code .... ? )

18-Feb-08 1:54

OnStatusCallBack() is called if enabled and the operation is pending completion.

since ftpConnection->PutFile() returns successfully, i think it is not pending for completion, so no status callback.

This is only my guess, try sending larger file.

Yanshof18-Feb-08 2:08

Re: Question about connection with FTP server ( What wrong with my code .... ? )

18-Feb-08 2:08

Thanks .... But

But i did Enable the callback - and the function OnStatusCallBack() is call - but I'm not sure that this call is really Callback call ( i except that this call will be from other thread and i see that this call is from the same thread.

Can someone help here.... ?

David Crow18-Feb-08 2:54

Re: Question about connection with FTP server ( What wrong with my code .... ? )

18-Feb-08 2:54

Yanshof wrote:
pInetSession = new CMyInternetSession("Test1", 1, INTERNET_OPEN_TYPE_DIRECT,NULL, NULL)

Why have you not specified INTERNET_FLAG_ASYNC? There is also a missing semicolon.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Yanshof18-Feb-08 3:06

Re: Question about connection with FTP server ( What wrong with my code .... ? )

18-Feb-08 3:06

The flag INTERNET_FLAG_ASYNC is not relevant -

When i add this flag i getting ASSERT ( on the constructor ( first line of the constructor ) ) of the function "CInternetSession" (in my case the function "CMyInternetSession").

So i remove this flag - and from what i see - this flag is not relevant ( Maybe i wrong ... )

David Crow18-Feb-08 3:15

Re: Question about connection with FTP server ( What wrong with my code .... ? ) [modified]

18-Feb-08 3:15

Yanshof wrote:
When i add this flag i getting ASSERT...

I see that now. Have you considered that to handle any operations asynchronously, you must either create your own thread or use the WinInet functions without MFC.

Yanshof18-Feb-08 3:21

Re: Question about connection with FTP server ( What wrong with my code .... ? )

18-Feb-08 3:21

I try to use WinInet also ( i try to avoid of using thread Frown | :(

) here is the code

[ The problem is that the CALLBACK function does not call at all ]

<br />
<br />
	HINTERNET hInternetSession;          // handle to Internet connection<br />
	HINTERNET hFTPSession;               // handle to FTP session<br />
	HINTERNET hFileConnection;           // handle to file enumeration<br />
<br />
	INTERNET_STATUS_CALLBACK iscCallback;<br />
<br />
	//create the root HINTERNET handle using the systems default settings.<br />
	hInternetSession  = InternetOpen("Test1", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, INTERNET_FLAG_ASYNC);<br />
<br />
	//sets the callback function<br />
	iscCallback = InternetSetStatusCallback(hInternetSession, (INTERNET_STATUS_CALLBACK)_OnStatusCallBack);<br />
<br />
	// Make connection to ftp server.<br />
	hFTPSession = ::InternetConnect(hInternetSession,							// Handle from a previous call to InternetOpen.<br />
									"10.11.10.11",								// Server we want to connect to<br />
									INTERNET_INVALID_PORT_NUMBER,				// Use appropriate port.<br />
									"XXX",										// Use anonymous for userName.<br />
									"YYY",										// Use e-mail name for password<br />
									INTERNET_SERVICE_FTP,						// Flag to use FTP services<br />
									INTERNET_SERVICE_FTP,						// Flags (see SDK docs)<br />
									0);											// Synchronous mode<br />
<br />
<br />
	<br />
	::FtpGetFile(hFTPSession,<br />
				 "File",<br />
			     "File_X",<br />
				 FALSE,<br />
				 FILE_ATTRIBUTE_NORMAL,<br />
				 FTP_TRANSFER_TYPE_BINARY,<br />
				 0);<br />
<br />
<br />

modified on Monday, February 18, 2008 9:29 AM

David Crow18-Feb-08 4:43

Re: Question about connection with FTP server ( What wrong with my code .... ? )

18-Feb-08 4:43

Yanshof wrote:
0); // Synchronous mode

This would appear to conflict with INTERNET_FLAG_ASYNC. Confused | :confused:

Yanshof18-Feb-08 4:57

How can I check the exsistence of a Registry Key?

18-Feb-08 4:57

No,

This param is Specifies the application-defined value that is used to identify the application context for the returned handle in callbacks.
If/When i add the flag INTERNET_FLAG_ASYNC - nothing happand Frown | :(

J_E_D_I18-Feb-08 1:21

Re: How can I check the exsistence of a Registry Key?

18-Feb-08 1:21

How can I check the exsistence of a Registry Key using C++?
I want the program to perform a certain action if the key does not exist.
Thanks

Rajkumar R18-Feb-08 1:26

Re: How can I check the exsistence of a Registry Key?

18-Feb-08 1:26

RegOpenKeyEx() API returns ERROR_SUCCESS if reg key exist

J_E_D_I18-Feb-08 2:42

Re: How can I check the exsistence of a Registry Key? [modified]

18-Feb-08 2:42

Thanks, that was a prompt reply!
How can I assign a certain value to a variable of my choice if the key does not exist?

Rajkumar R18-Feb-08 2:54

Re: How can I check the exsistence of a Registry Key?

18-Feb-08 2:54

J_E_D_I wrote:
How can I assign a certain value to a variable of my choice if the key does not exist?

MyChoiceVariableType MyChoiceVariable = MyChoiceInitialValue; :) 
if (ERROR_SUCCESS != RegOpenKeyEx( HKEY_LOCAL_MACHINE,
            "SYSTEM\\CurrentControlSet\\Control\\ProductOptions", // u can replace with ur choice key
            0, KEY_QUERY_VALUE, &hKey ))
{
  MyChoiceVariable = MY_CHOICE_VARIABLE_VALUE; :) 
}

modified on Monday, February 18, 2008 9:11 AM

J_E_D_I18-Feb-08 7:10

Re: How can I check the exsistence of a Registry Key? [modified]

18-Feb-08 7:10

I get error C2065: 'hKey' : undeclared identifier. Have I missed something? D'Oh! | :doh:

Here is my code:

int MyChoiceVariable = 1;
if (ERROR_SUCCESS != RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\ProgramX\\Key", 0, KEY_QUERY_VALUE, &hKey ))

{ MyChoiceVariable = 0;
cout << MyChoiceVariable << endl;
}

Rajkumar R18-Feb-08 7:38

Re: How can I check the exsistence of a Registry Value?

18-Feb-08 7:38

J_E_D_I wrote:
error C2065: 'hKey' : undeclared identifier

so u r now in this stage, to write a registry based program. Suspicious | :suss:

I was already wondering in ur previous post asking how to assign a variable. Roll eyes | :rolleyes:

Any way let me complete the code. Cry | :((

declare hKey,
HKEY hKey = NULL;

modified on Monday, February 18, 2008 2:06 PM

J_E_D_I18-Feb-08 10:07

Re: How can I check the exsistence of a Registry Value?

18-Feb-08 10:07

That's great, now it works! I am reporting below a simplified code for who's joined the post only now.

//If you want to check if a Registry key exists:
HKEY hKey = NULL;
string MyChoiceVariable;
if (ERROR_SUCCESS != RegOpenKeyEx( HKEY_LOCAL_MACHINE, "SOFTWARE\\..", 0, KEY_QUERY_VALUE, &hKey ))

{ MyChoiceVariable = "KEY DOES NOT EXIST";
cout << MyChoiceVariable << endl;
}

if (ERROR_SUCCESS == RegOpenKeyEx( HKEY_LOCAL_MACHINE, "SOFTWARE\\..", 0, KEY_QUERY_VALUE, &hKey ))

{ MyChoiceVariable = "KEY EXISTS";
cout << MyChoiceVariable << endl;
}

Now the next (and final!) question is...what if I want instead to check if a REG_DWORD value exists?

David Crow18-Feb-08 11:03

Re: How can I check the exsistence of a Registry Key?

18-Feb-08 11:03

J_E_D_I wrote:
...I want instead to check if a REG_DWORD value exists?

Have you considered RegQueryValue()?

J_E_D_I18-Feb-08 10:10

Re: How can I check the exsistence of a Registry Key?

18-Feb-08 10:10

Rajkumar R18-Feb-08 19:29

Re: How can I check the exsistence of a Registry Key?

18-Feb-08 19:29

i just want to confirn whether u are waiting for how to assign your choice variable when using RegQueryValueEx() API for checking REG_DWORD value Unsure | :~

J_E_D_I19-Feb-08 2:13

Re: How can I check the exsistence of a Registry Key?

19-Feb-08 2:13

Hi Rajkumar, many thanks indeed for your help. What a relief, after a few attempts I came to a solution (see below). If it wasn't for the help of you guys from the Code Project forum, I would probably be stuck on these painful registry functions for months.. The "help" on MSDN and VS2005 might be ok as a reference only, but is totally useless unless you are an advanced programmer! Mad | :mad:

///// This code checks if a Value belonging to the opened Registry Key exists or not
unsigned long type=REG_SZ, size=1024;
char res[1024]="";
string MyChoiceVariable2;
HKEY key;

if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\..", NULL, KEY_READ, &key)==ERROR_SUCCESS)
{
if (ERROR_SUCCESS != RegQueryValueEx(key, "ValueName", NULL, &type, (LPBYTE)&res[0],&size))

{ MyChoiceVariable2 = "VALUE DOES NOT EXIST";
cout << MyChoiceVariable2 << endl;
}

if (ERROR_SUCCESS == RegQueryValueEx(key, "ValueName", NULL, &type, (LPBYTE)&res[0],&size))

{ MyChoiceVariable2 = "VALUE EXISTS";
cout << MyChoiceVariable2 << endl;
}
RegCloseKey(key);
}

Rajkumar R19-Feb-08 2:41

Re: How can I check the exsistence of a Registry Key?

19-Feb-08 2:41

J_E_D_I wrote:
if (ERROR_SUCCESS != RegQueryValueEx(key, "ValueName", NULL, &type, (LPBYTE)&res[0],&size))

{ MyChoiceVariable2 = "VALUE DOES NOT EXIST";
cout << MyChoiceVariable2 << endl;
}

if (ERROR_SUCCESS == RegQueryValueEx(key, "ValueName", NULL, &type, (LPBYTE)&res[0],&size))

{ MyChoiceVariable2 = "VALUE EXISTS";
cout << MyChoiceVariable2 << endl;
}

have you heard about if...else.. clause in C++.

J_E_D_I wrote:
RegCloseKey(key);

I appreciate your attempt to use the undiscussed RegCloseKey() API which is necessary.

David Crow18-Feb-08 8:25