C / C++ / MFC

4-Dec-07 22:35

SOCKET s = socket(AF_INET,SOCK_STREAM,0);
after I successfully connect to server,I use send function to send data.
I use default buffer and i get default value is 8192. and i don't set s to nonblocking. as following is my code fragment:
char buf[100*1024]={0};
memset(buf,0x08,sizeof(buf));
int nRet = send(s,buf,sizeof(buf),0);
but this function successfully complete. according to my understand,this function should in blocking .
cys

Laurence4-Dec-07 22:44

4-Dec-07 22:44

my test environment is in LAN

SandipG 4-Dec-07 22:59

SandipG

4-Dec-07 22:59

Whts the value of iRet??
if it is SOCKET_ERROR find the error by using WSAGetLastError()
or if it equals the byte actual bytes sent then nothing wrong in it.
and as far as ur question goes i guess it is supposed to be blocking call

Thanks,
Sandip.

Laurence5-Dec-07 1:45

5-Dec-07 1:45

nRet 's value equals 102400. this socket is in blocking mode. Because the default buffer size is 8192 bytes, and i send 102400 bytes. Obviously, 102400 is bigger than 8192, so this i/o operation should be blocked, but the actual result is that this i/o operation completes immediately.
P.S. The environment of the test is "LAN".

Thanks
Cys

followait4-Dec-07 23:24

4-Dec-07 23:24

It blocks until data is all sent or error occurs.

ktm TechMan5-Dec-07 0:13

ktm TechMan

5-Dec-07 0:13

VC_FOOD wrote:
but this function successfully complete. according to my understand,this function should in blocking .

I didn't understand what are you asking for. Confused | :confused:

Laurence5-Dec-07 1:46

5-Dec-07 1:46

this socket is in blocking mode. Because the default buffer size is 8192 bytes, and i send 102400 bytes. Obviously, 102400 is bigger than 8192, so this i/o operation should be blocked, but the actual result is that this i/o operation completes immediately.
P.S. The environment of the test is "LAN".

Thanks
Cys

R about send function!!

Laurence5-Dec-07 1:50

5-Dec-07 1:50

This socket is in blocking mode. Because the default buffer size is 8192 bytes, and i send 102400 bytes. Obviously, 102400 is bigger than 8192, so this i/o operation should be blocked, but the actual result is that this i/o operation completes immediately.
P.S. The environment of the test is "LAN".

Thanks
Cys

JudyL_MD5-Dec-07 2:33

JudyL_MD

5-Dec-07 2:33

The underlying network stack and driver were able to output the data before the return back into user-land, therefore your call completed with all bytes sent.

I've never found any relationship between the default buffer sizes and the amount of data I could send into or receive from the network stack. Just check the return values to see how many of the requested bytes were handled and deal with that situation.

Judy

How to catch GDI+ exceptions? [modified]

Dexterus5-Dec-07 21:24

Dexterus

5-Dec-07 21:24

Unless your computer is very very very slow I doubt send would ever actually block for a perceptible amount of time. Shouldn't be that hard to push some data from your buffer to the wires, the function doesn't need to wait for anything but your pc and 100KB on a 100Mbit card ... that's easy.

followait4-Dec-07 22:08

4-Dec-07 22:08

for example

try {
    Bitmap bmp(path);   //It is strange that the piece of code  works
                        //in my test app, when I copy it, it throw
                        //exception here. The code is totally local.
} catch (/*???*/) {
]

	CMainFrame *pMF=(CMainFrame *)AfxGetMainWnd();

	TCHAR Path[MAX_PATH];
	TCHAR FullPath[MAX_PATH];
	BROWSEINFO bi;
	::memset(&bi,0,sizeof(bi));
	bi.hwndOwner=m_hWnd;
	bi.pszDisplayName=Path;
	bi.lpszTitle=TEXT("Select a directory");
	bi.ulFlags=BIF_DONTGOBELOWDOMAIN|BIF_EDITBOX|BIF_NEWDIALOGSTYLE
		|BIF_NONEWFOLDERBUTTON|BIF_RETURNONLYFSDIRS|BIF_STATUSTEXT;
	LPCITEMIDLIST pidl=SHBrowseForFolder(&bi);
	if(::SHGetPathFromIDList(pidl,FullPath)) {
		int len=_tcslen(FullPath);
		CString s(FullPath);
		s+=TEXT("\\*.jpg");
		CFileFind ff;
		BOOL b=ff.FindFile(s);
		while (b) {
			b=ff.FindNextFile();
			CString FilePath=ff.GetFilePath();
			WCHAR *p=FilePath.AllocSysString();
			Gdiplus::Bitmap bmp(p);
			Gdiplus::Bitmap *pThmb=(Gdiplus::Bitmap*)bmp.GetThumbnailImage(60,45);
			HBITMAP hBmp;
			pThmb->GetHBITMAP(Color::Black,&hBmp); 
//Got exception in the previuos line, 
//pThumb is NULL and bmp seems not available when I check in debug

modified on Wednesday, December 05, 2007 4:15:58 AM

SandipG 4-Dec-07 22:47

SandipG

4-Dec-07 22:47

Have you verified value of FilePath is it valid file path??
i guess you also have to do following
CString FilePath=ff.GetFilePath();
FilePath = FilePath + "\\" + ff.GetFileName();
i am not sure about the "\\" it might be already there in GetFilePath.

Thanks,
Sandip.

followait4-Dec-07 23:00

4-Dec-07 23:00

Yes, the FilePath can't be wrong.

SandipG 4-Dec-07 23:08

SandipG

4-Dec-07 23:08

You are also not checking it for directory??

followait4-Dec-07 23:18

converting LPCSTR to char*

4-Dec-07 23:18

Not yet. But I set a breakpoint there to make sure the path is all right.

VC++ https

mohindar_kks4-Dec-07 22:02

mohindar_kks

4-Dec-07 22:02

Hi,

am sundar.I have one doubt in vc++.How to connect the https web service in vc++?The webservice was developed in vc++.I have connected http site in vc++ and it was working.When i connect the https site,it displays the error in the screen.

I have done in asp.net.Its working fine.Please let me know what are the procedures to follow to connect the https site in vc++.

Anyhelp would be appreciated.

Regards,
R.Sundar

Re: VC++ https

ThatsAlok4-Dec-07 23:33

ThatsAlok

4-Dec-07 23:33

What type of request do you want to sent to webservice, i mean GET/POST or something else

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You

Re: VC++ https

mohindar_kks5-Dec-07 0:13

mohindar_kks

5-Dec-07 0:13

m using the 'Post type.am attaching the code.Please verify.The http is working in same code.Is there any credentials to pass the code?

HTTPMethod = _bstr_t( "POST" );
httpReq->open(HTTPMethod ,"https://gtl-334/XmlTesting/Service.asmx",noAsync,vUser,vPassword);
httpReq->setRequestHeader("Content-Type", "application/soap+xml");

CString szRequest;// = "<strUserName>";
//szRequest += "chaitanya";
//szRequest +="</strUserName>";

szRequest = "<?xml version=\"1.0\" encoding=\"utf-8\"?> \
<soap12:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap12=\"http://www.w3.org/2003/05/soap-envelope\"> \
<soap12:Body>\
<RetrieveKey xmlns=\"http://tempuri.org/\"> \
<serial>1001</serial>\
</RetrieveKey>\
</soap12:Body>\
</soap12:Envelope>";

//szRequest = "Chaitanya";
VARIANT vRequest;
vRequest.vt = VT_BSTR;
vRequest.bstrVal = szRequest.AllocSysString();

httpReq->send(vRequest);
BSTR strText;

_bstr_t bsResponse = httpReq->responseText;

neha.agarwal274-Dec-07 21:27

neha.agarwal27

4-Dec-07 21:27

Hi all,

I want to convert my LPCSTR value to char* how to do so.

Can anybody please help me in this.

Thanks in advance

Cedric Moonen4-Dec-07 21:30

Cedric Moonen

4-Dec-07 21:30

LPCSTR is a const char pointer. Why do you want to remove the const ?
When asking a question, please be specific and tell exactly what you are trying to do. So, in which context do you want this conversion ?

Cédric Moonen
Software developer

Charting control [v1.2]

CPallini4-Dec-07 21:44

CPallini

4-Dec-07 21:44

if (and only if) you have this requirement because of a bad designed function prototype (and you cannot change it, e.g. you have a third party DLL), i.e. a function that in fact doesn't change input buffer but accepts char * as argument, then you can simply cast the pointer.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Don Box4-Dec-07 21:47

Don Box

4-Dec-07 21:47

Use const_cast<char*> (variable).

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