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Thank you for your reply. I think you are right, for interger it is showing -1 for set flag. I am using SQL server.
~Pankaj
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When exactly is the file mapped into memory updated on the disk? I thought it will be updated as and when it is updated in the memory, but the documentation of UnMapViewOfFile says "If the function succeeds, the return value is nonzero, and all dirty pages within the specified range are written \"lazily\" to disk" which means the file will be written to the disk only when UnMapViewofFile is called.
Can someone clarify? Thanks.
thanks
/f
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This is saying tht UnMapViewOfFile will trigger a lazy write, but the OS may write this data at any time. For performance reasons, however, it will tend to defer this. If you must write the data, just call FlushViewOfFile().
Note, however, that by default this still does a lazy write as do all disk writes (by default.) In practice the data will be written within very few milliseconds. And before you panic, note that your hard disk has a cache and is essentially doing the same thing.
If you want more immediate writes, you must use the FILE_FLAG_WRITE_THROUGH flag when you open the file (and follow the guidelines of using that flag.)
Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke
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I posted something similar to this earlier, but I think I'm getting closer to the problem.
I wrote my own class, CFAFRecord, that is a derivative of CObject. When someone presses the button, I do something similar to
my_ObjectArray.SetSize(10);
CFAFRecord my_Record;
my_Record.name = m_Name;
my_Record.address = m_Address;
my_ObjectArray.SetAt(0, &my_Record);
my_ObjectArray in the example is a CObArray that is a member variable of my dialog. Later, when I try to access, I try
CFAFRecord * my_Record = *(CFAFRecord *)my_ObjectArray.GetAt(0);
m_Name = (*my_Record).GetName();
When I try that last line, I get an access violation, looks like a memory access error. I think I'm handling the memory wrong somewhere, maybe in the first functiion, when I use the SetAt, I pass the pointer to my_Record and my_Record is probably destoyed at the end of the function. If that's the case, how can I can I fix this?
Danny
The stupidity of others amazes me!
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Thought so, you have now posted the offending code.
my_ObjectArray.SetSize(10);
CFAFRecord my_Record;
my_Record.name = m_Name;
my_Record.address = m_Address;
my_ObjectArray.SetAt(0, &my_Record); my_Record goes out of scope and is destroyed, so that the address that is stored in my_ObjectArray now points to useless memory, thus your access violations.
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" - mYkel - 21 Jun '04
"There's not enough blatant self-congratulatory backslapping in the world today..." - HumblePie - 21 Jun '05
Within you lies the power for good - Use it!
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bugDanny wrote: CFAFRecord my_Record;
Should be:
CFAFRecord *my_Record = new CFAFRecord;
...
my_ObjectArray.SetAt(0, my_Record);
"Take only what you need and leave the land as you found it." - Native American Proverb
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Thank you.
Danny
The stupidity of others amazes me!
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Is there any one know how make a circle push button and place a bitmap on it?
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SHALOM
half an hour ago I posted a message to know how to send the size of one file that I want to send through a socket
,
ok now the problem is that I have sent characters through a scoket , but I dont know how to send a file,
I think that the first thing I need is to open the file in the side I want to send the file , right ?
and in the other side I need to open a new file where Im gonna put the file,,
but I dont know how to use fread and fwrite,
I mean I have read the msnd help, but I dont understand how to send the entire file
I need to do a while until all the data have been sent ??
can somebody help me,, Im tryin to test my connection, and the last thing I need to do is to send the file that I have capture a .Wav file from one computer to another.
thanx
GOD BLESS YOU
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REU wrote: mean I have read the msnd help, but I dont understand how to send the entire file
I need to do a while until all the data have been sent ??
Here is Example :-
http://www.codeproject.com/internet/SocketFileTransfer.asp[^]
A Request:- don't target your post to peculiar person 
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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I've been messing with this application for a while now. I have an unmanaged dll that fires a few events I want to capture in my C# app.
I used a C++ managed app, found here at codeproject, that would act as an interface to my unmanaged C++ and my C# app.
I never could get it to work, so im deciding whether or not I can put the unmanaged code inside my managed code and still use my events in unmanaged code.
If this is possible I could then reference it in C# and create an event handler for those events.
My question is, what does this entail?
What about the includes in my unmanaged code?
Am I correct in thinking that include 'windows.h' can be replaced with using namespace System;?
Other includes I'm using are:
strhandle.h
string.h
stdio.h
stdlib.h
share.h
and iohandler.h
What are the .Net equivalents to these?
Also my unmanaged code uses __asm to loop through some data, is that transferable to .Net?
Sorry for the many questions, I appreciate any help one can give me.
Steve Welborn
"Science can purify religion from error and superstition.
Religion can purify science from idolatry and false absolutes"
- 1987 John Paul the Great
-- modified at 11:08 Tuesday 18th October, 2005
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Disregard post. I figured it out.
Steve Welborn
"Science can purify religion from error and superstition.
Religion can purify science from idolatry and false absolutes"
- 1987 John Paul the Great
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Hi every body!
First, thank for your help.
I want to build an engine to read HTML Help file (.chm).
It can return topic, content, ... in the .chm file.
I was tried do that with API function HtmlHelp(...) (I found this function in HTML WorkShop), but it only return me the Help View with the .chm file, not any topic, content!
I really need this, please help me
Thanks!
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SHALOM
everybody
I have a big problem,
Im using sockets to communicate 2 aplicattions,
Im using the functions send() and recv()
and everythings is going well ,,
but now I need to send a file , is a .Wav file
so the first thing I need to know is the size of the file to transfer first the size of the file , then in the other side of the connection I will know how size to receive.
well the size I get using this
FILE* f;
f=fopen("file1.Wav","rb");
int size;
fseek(f,0,SEEK_END); //move the pointer to the final of the file
size=ftell(f); //to know where is the pointer
rewind(f); //to put the pointer in the begining of the file
so I have in size the size of the file.
but this is an int var
Im trying to send the data like this
send(socket, &size, sizeof(size), 0);
so when I try to send it by the sockets it say
error C2664 cannot convert parameter 2 from int * to const char *
the function send() takes 4 param
http://msdn.microsoft.com/library/en-us/winsock/winsock/send_2.asp[^]
so,, can somebody tell me how to send the size of the file ???
Thanx
GOD BLESS YA
REU
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REU wrote: int size;
fseek(f,0,SEEK_END); //move the pointer to the final of the file
size=ftell(f); //to know where is the pointer
rewind(f); //to put the pointer in the begining of the file
so I have in size the size of the file.
but this is an int var
Im trying to send the data like this
send(socket, &size, sizeof(size), 0);
Hello Reu,
please modify your code something like this :-
On Sender End
char szSize[10];
itoa(size,szSize,10);
send(socket, szSize, strlen(szSize),0);
On Receiver End
int iSize;
recv(socket, szSize, strlen(szSize),0);
iSize=atoi(szSize);
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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maybe just like that:
send( socket, (const char*)&size, sizeof( int ), 0 );
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You have posted to wrong person... Right person in above me 
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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I've got an application where I want a modeless dialog to stay on top of other applications.
When I call SetWindowPos for the main window, this window stays on top of the others but when I try the same code for the modeless it just stay on top of its parent.
The code is just basic SetWindowPos:
SetWindowPos(m_hWnd, NULL, 0, 0, 0, 0, HWND_TOPMOST);
Is there a trick or a way to make that modeless topmost ? or is it a problem from my program ?
Yarp
http://www.senosoft.com/
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Just a guess, but you need to make the parent of your modeless dialog be the desktop, rather
than your main window. You can se the *owner* of your dialog to be your main window...
Iain.
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Sure, this is a good idea. If I can't find a clean solution I will try this. Doesn't mean your solution is a dirty one, just looking for the perfect one if any 
Yarp
http://www.senosoft.com/
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Try SetForegroundWindow
--
======
Arman
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yarp wrote: The code is just basic SetWindowPos:
SetWindowPos(m_hWnd, NULL, 0, 0, 0, 0, HWND_TOPMOST);
Is there a trick or a way to make that modeless topmost ?
Try this instead.
SetWindowPos(&wndTopMost, 0, 0, 0, 0, SWP_NOSIZE);
CWnd::SetWindowPos[^]
DEBUGGING : Removing the needles from the haystack.
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I found a solution as suggested by Iain. The other ways din't work:
Here's the function that makes it :
void CfrmImg::EnableStayOnTop(bool bDesktop)<br />
{<br />
if (bDesktop) {<br />
::SetWindowLongPtr(m_hWnd, GWL_HWNDPARENT, NULL);<br />
::SetWindowPos(m_hWnd, HWND_TOPMOST, 0, 0, 0, 0,<br />
SWP_NOMOVE | SWP_NOSIZE);<br />
}<br />
else {<br />
if (::GetParent(m_hWnd)==NULL)<br />
::SetWindowLongPtr(m_hWnd, GWL_HWNDPARENT, (LONG_PTR)frmMain->m_hWnd);<br />
::SetWindowPos(m_hWnd, HWND_TOPMOST, 0, 0, 0, 0,<br />
SWP_NOMOVE | SWP_NOSIZE);<br />
}<br />
}<br />
I recall this is for a modeless dialog - don't know if it makes sense for modals.
The SetWindowLongPtr with GWL_HWNDPARENT parameter is a dirty hack. MSDN says SetParent should be used instead, but with SetParent it didn't work (I presume I have to change the windows style as suggested by MSDN - this is a later clean up work).
At the moment I'm happy with my stay on top function.
Thanks all for your assistance.
Yarp
http://www.senosoft.com/
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I created a dialog class CSchDlg derived from CDialog. The dialog box has a few buttons(radio and checkboxes also) and a list box. Using the class wizard i created member variables of type CButton for all the buttons and of type CListBox for the list box.
Inside the OnInitDialog() i tried the following.
Say m_ctrlButton1 is of type CButton and is the member variable for the radio button with the ID IDC_RADIOBUTTON1
<br />
m_ctrButton1.SetCheck(BST_CHECKED);<br />
The above stmt produced error.
So i changed it to
<br />
CButton *pButton;<br />
pButton = (CButton *) this->GetDlgItem(IDC_RADIOBUTTON1);<br />
pButton->SetCheck(BST_CHECKED);<br />
... and it worked fine.
I tried the same thing for the ListBox also.
<br />
CListBox *pListBox;<br />
pListBox = (CListBox*) this->GetDlgItem(IDC_LISTBOX1);<br />
... but it produced Access Violation Error
What could be the reason?
Why do i have to use GetDlgItem() to set/enable or do anything on the buttons inside the OnInitDlg() but neednt do it in other functions?
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