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Hello! Im fairly new to winsock programing, and am having trouble receiving a response that is spread accross several packets. I have been watching the communications through a packet sniffer, and know that 30 to 40 1500 byte sized packets are comming in with good data, but my program is only executing one recv and reporting a bytes Recv of 9. There must be some concept that im completely missing  any help would be greatly appreciated.
heres my code:
bytesRecv = SOCKET_ERROR;
char queryRecvBuff[1500] = "";
CString reply = "";
send(m_socket,serverQuery,30,0);
TRACE("SENT\nRECEIVING:\n");
while( bytesRecv == SOCKET_ERROR ) {
bytesRecv = recv( m_socket, queryRecvBuff, 1500, 0);
if ( bytesRecv == 0 || bytesRecv == WSAECONNRESET ) {
TRACE( "Connection Closed in Auth.\n");
break;
}
if (bytesRecv < 0){
TRACE("\tbytes Recv < 0!!!");
return;
}
reply.Append(queryRecvBuff,bytesRecv);
TRACE( "\tBytes Recv: %ld\n", bytesRecv );
}
TRACE("\nRECEIVED");
output:
WAITING FOR Verification: VERIFIED
Sending Query: SENT
RECEIVING:
Bytes Recv: 9
RECEIVED
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Knave777Wave wrote:
while( bytesRecv == SOCKET_ERROR ) {
bytesRecv = recv( m_socket, queryRecvBuff, 1500, 0);
I don't have all your code (ie. a server to send responses back) so I can't step through your code to really help you. But based on the code above:
SOCKET_ERROR is defined as having value -1
recv(...) is returning 9 bytes to you
This explains why the loop is only run once as bytesRecv will contain the value 9 which is not equal to -1 (SOCKET_ERROR).
As to if this is the proper value that is being recieved I don't know. If the first packet being sent from the server is of size 9 then this makes sense. Otherwise, I don't really know the reason.
Greba,
My lack of content on my home page should be entertaining.
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thnx... i dont know what i was thinking
I switched it to a do--while w/ (bytesRecv != SOCKET_ERROR) and now i receive tons of packets and jump out of the loop with bytesRecv == 0.
Is this the normal behavior for such a transaction to end? Ive noticed several empty data packets being sent in the sniffer. Are these special packets that singal 'received' and so forth? If so, is my app receiving a special 'transfer done' packet that causes my last recv to unblock and return 0 bytes?
I dont know what the server is doing since it is not my app, its a particular games master server with a list of public game servers. I know all of this sounds pretty dumb, but this is a learning experiment where im trying to dive in a learn what is going on at the packet and app level.
thnx
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Under the documentation of the recv function: "If the connection has been gracefully closed, the return value is zero". I'm assuming this would mean that the server has closed the connection. As to if this a correct or not assumption I don't know.
It doesn't sound pretty dumb, that is definitely a challanging and rewarding way to learn. If you still have problems with your recv, then I would suggest creating a server which emulates the behavior of the real server, and determine if you can send empty packets, and what happens when you close down a connection.
Greba,
My lack of content on my home page should be entertaining.
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Anyone know how to do this?
ed
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For example, suppose a project is composed of these 2 files:
//file1
extern int socket1;
//file2
int socket1;
Is possible to test for the existence of int socket1 during compilation if file2 is not part of the build, using some kind of compiler directives so that the project will compile/build normally?
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A way to test for the existence of int socket1 in file1 would be use the preprocessor directives:
<br />
#ifdef socket1<br />
extern int socket1;<br />
#endif<br />
This will tell the preproccesor (what happens before compilation) to only use the code contained between "#ifdef socket1" and "#endif". If socket1 isn't defined (in file2) then the code between the preproccesor directives will not be compiled at all.
You will have to be careful though. Assuming you have code that used socket1 in file1 then you will get compile errors saying that socket1 isn't defined. To combat this you can do the following:
<br />
#ifdef socket1<br />
extern int socket1;<br />
#else<br />
int socket1;<br />
#endif<br />
I believe that answers your question.
Greba,
My lack of content on my home page should be entertaining.
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jerry1211a wrote:
Is possible to test for the existence of int socket1 during co
Not directly, because the information you're looking for is not available at compile time, only link time. The extern int socket1 line tells the compiler "there's an int defined somewhere called socket1" and that's all it needs. It's not until the linker comes along that the build process actually checks to see that socket1 is defined somewhere. That's why "unresolved external" errors are linker errors.
--Mike--
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ | You Are Dumb
Magnae clunes mihi placent, nec possum de hac re mentiri.
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I'm trying to catch F6 being pressed using 'OnKeyDown', but when F6 is pressed I get nothing. Keys F1, F2, F3, F4, F5 & F7 all work (I haven't tried the other function keys yet).
It's got me scratching my head, I even changed the keyboard, but it still does nothing. Any ideas?
Thanks,
Ali
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I recall having this problem in ED on a specific version of Windows where Windows itself grabbed F6. It may have been W2K. Just tried WXP and it is OK. Try a Google search. HTH.
Neville Franks, Author of ED for Windows www.getsoft.com and Surfulater www.surfulater.com "Save what you Surf"
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Thanks for the advice, I have Googled it and no one else seems to have this problem. I am using WXP too!
I am compiling under VC++6, is that what you are using?
I'm going to try it on some other machines here, I have only tried 1 other so far, I'm wondering if it is another peice of software interfering with the keyboard int that I have installed on both machines I've tried.
(Now 'add a smiley' in CP isn't working for me either ... oh no, its going to be one of those days!)
Thanks again,
Ali
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If I use Greta(or some STL implement) in MFC, who can give
me a code sample with backref and substitution. At least let
AfxMessageBox to show backref.
Is there some regular expression not STL implemented and free,
and full features with Perl, Henry Spencer's Regexp Engine is good but
does not support regexp like this :
.*? .+?
Thanks!
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http://www.boost.org/
boost regex 
modified 12-Sep-18 21:01pm.
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I have a semi-transparent window. I need all mouse clicks to fall through to proper windows underneath mine. I need to implement a "click-through window"
A previous suggestion was to return HTTRANSPARENT from WM_NCHITTEST. HTTRANSPARENT is usefull when you create a control and you want clickthrough to the parent (same thread). However in my case I want clicks to fall through a top level window to the underlying windows.
Does anyone have any further suggestions?
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I am trying to create a flash movie from within an MFC (MDI) application. The movie must receive information from the program, but not necessarily send anything.
I am aware that I might need to launch IE to run the flash file, so help with that is also appreciated.
Here's what I am looking for:
1. What libraries do I need, and where to get them?
2. Perhaps a code snippet or documentation reference.
3. Code to launch IE (unless there's a way to display a flash movie in a regular MFC view).
Thanks
When the going gets tough... write a computer program to do it for you
When the going gets tough... write a computer program to do the thing for you
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There is no need to launch Internet Explorer to display a Flash movie. Macromedia provides an ActiveX control. You don't even need any special libraries - all computer with flash player installed should have the ActiveX control available. Simple add the player to your toolbox and then add it to your dialog.
As far as I remember communicating with Flash is done via fscommand(??). Just search Macromedia for more information. I'm sure tutorial and documentation is available.
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Hi everybody,
I'm trying to write my own installer tool at the moment.
I want to install the following components in this order:
[1] MSDE 2000
[2] MDAC 2.8
[3] .Net Framework
[4] my Application
In my code (console app) I do something like this:
1. start msdeSetup.exe (with CreateProcess(...))
2. Wait till msde is installed completely
3 start mdacSetup.exe .......
4. wait ...
5. start ...
and so on
this works quite well.
My Problem is now that I want to wait with the reboot till EVERYTHING is installed, but some of this components (e.g. msde) force a reboot by themselves.
So my Question is: How can I execute a File with CreateProcess(...) but suppress any reboot this app might perform, so I can start my own reboot when everything is installed
Thanks for your help
cu
immes
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Are there any library functions for resolving dos file references into a list of files? For example...
"*.*" or "?hello?.*" or *1?2?3*.cpp" or "C:\windows\*.exe" or even "c:\*\fish.bmp"
Is there an easy way to get a list files refered to by these?
Joel Holdsworth
"Outlook not so good"
That magic 8-ball knows everything! I'll ask about Exchange Server next
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something like this?
void LoadFileNamesFromDirectory(CStringArray *pFileNames, LPCSTR cpDirSpec = NULL)
{
CString cFileName;
WIN32_FIND_DATA sFD;
if (!cpDirSpec || *cpDirSpec == 0)
cpDirSpec = "*.*";
HANDLE hFind = FindFirstFile(cpDirSpec,&sFD);
if (hFind != INVALID_HANDLE_VALUE)
{
if (!(sFD.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
pFileNames->Add(sFD.cFileName);
while (FindNextFile(hFind,&sFD))
{
if (!(sFD.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
pFileNames->Add(sFD.cFileName);
}
FindClose(hFind);
}
}
onwards and upwards...
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How can i bring MAC style to the UI of my application developed using VC++6.0.Is there any method to tweeking the code so as to optain such an interface?if any free libraries are avaliable to optain such output please do specify that to...!
Thankyou
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I'm new to Visual C++ and trying to learn it. I've written a Windows program from the ground up and I'm trying to add a status bar to my dialog window but I get a compile error:
...\489window.cpp(14): error C2228: left of '.SetPaneText' must have class/struct/union type
Here's my declaration and code with the offending line at the end, the static void declaration:
<br />
public:<br />
CStatusBar m_bar;<br />
static void setStatusBarText(CString newText){ m_bar.SetPaneText(NULL, newText, true); }
I have a menu and when the user clicks "Open..." in the menu, they get the open file common control and once the file has been chosen, my program fetches two fields, a height and width of the bitmap image and it should then set the status bar to be "<width> x <height>" with the numbers filled in.
Where the program does this is in a class I derived from CWinApp, but the codeproject.com example I found places the status bar declaration in the class derived from CWnd (I derived my dialog from CFrameWnd from using another example somewhere) which is where the above code is copied from. It's acting like it doesn't know what m_bar is because I can try and retype the m_bar.Create(...) line but once I hit the period, it tells me m_bar isn't a union, class or struct, but it was declare the line above it. Any help is appreciated, but please remember I'm new and need something easier to understand than most. Thanks in advance.
more:
I just adedded the create line in the constructor for my CFrameWnd derived class and it knows m_bar. I commented out the offending line above, so I just have the declaration and the create. I ran the program and it created the status bar and it looks just fine. I still get that error above.
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Remove the static keyword from your function prototype and it should work.
The static declaration means that your function does not exist with the instance of your class, therefore will be unaware of any member functions.
I Dream of Absolute Zero
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I think I started out without static and then I encountered this error:
...\489window.cpp(64): error C2352: 'C489guiFrame::setStatusBarText' : illegal call of non-static member function
And here's the line for that:
C489guiFrame::setStatusBarText(sizeInfo);
Here's the changed prototype:
void setStatusBarText(CString newText){ m_bar.SetPaneText(NULL, newText, true); }
I ran into that error before, that's why I tried the static keyword.
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You need to have an instance of C489guiFrame
LighthouseJ wrote:
C489guiFrame::setStatusBarText(sizeInfo);
then becomes
C489guiFrame myGUIFrame;<br />
<br />
myGUIFrame.setStatusBarText(sizeInfo);
or something similar.
Ant.
I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)
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