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Dimitris Vikeloudas wrote:
E.g. for my own inverstigation I found that the _stat (aka stat of UNIX) returns always the same inode number whatever the file is.
Which is what the documentation says it will do on FAT, HPFS, or NTFS file systems. It is a UNIX-specific value.
Dimitris Vikeloudas wrote:
iii. How can I related the different handles logically.
What exactly do you mean by this? A handle is nothing more than an object identifier. You have a handle: Dimitris Vikeloudas. It is what's used when we want to communicate with you (except that we do not destroy yours when we are done!).
Dimitris Vikeloudas wrote:
iv. How the files, the HANLDE and processes are related.
There is no relationship, except that a process can "own" zero or more handles. Per MSDN, a process is a running application that consists of a private virtual address space, code, data, and other operating-system resources, such as files, pipes, and synchronization objects that are visible to the process. A process also contains one or more threads that run in the context of the process. A handle is a a variable that contains the address of another variable, which in turn contains the address of the desired object, or a token that an application can use to identify and access an object such as a device, a file, a window, or a dialog box.
"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown
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Hi.
Thanks very much. Your definition of the process it is enlightening.
So for a file you have a HANLDE pointing to a handle structure pointing to a file structure related to disk. That's what I am getting.
Is any similar chain for the CFile object? Also what happen with the UNIX compatibility functions like open. Is the integer that they return a handle casted to int or a is there an array of file descriptors that the C runtime environment maintains to emulate the UNIX process structure?
And what about stdio FILE structures? How do they know the access tokens of the files that they correspond. Simply what I am trying to understand is what is the relationship between an area in a disk and the logical structures. I think you answered what a HANDLE does on that.
If you know any documentation going to all these details will be much appreciated.
life is a river with mist ahead..
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Dimitris Vikeloudas wrote:
Simply what I am trying to understand is what is the relationship between an area in a disk and the logical structures.
I do not believe windows gives the user access to any of the kernel structures it uses to read/write files. At most you get a handle tell the kernel what hidden (to the application) structure to use to access the file. CFile, stdio, and streams all use the Windows api CreateFile, ReadFile, WriteFile and CloseHandle to open/create, read, write and close files.
John
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Dimitris Vikeloudas wrote:
i. How an area in a disk is related with file structures
No relation at all.
John
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There are 2 main structures in Windows system: FAT32 & NTFS.
The NTFS system is similar to the UNIX ,But the FAT32 are not. you can search the topic about FAT32 from MSDN or Google.
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i'm doing a project but now i'm struck...
i was given an image(256 by 256)i need to differentiate the selected area region.. this is how the project goes...
on the image i nedd to draw a bigger Circle(A)and a smaller circle(B) inside (A), both the circle pixel value are set to 1..
outside the (A) the pixel is set to 0...
between (A) and (B) the pixel is set to 2...
inside (B) the pixel value is set to 0....
anyone who can help pls reply...
/*this is for the bigger circle*/
int r, c;
int i,n,n_1;
bool hit;
for(r=0; r<n_rows; r++){
="" for(c="0;c<n_cols;c++){
" index[r][c]="2;
" }
}
=""
for(i="0;" i<area_pix_cnt;="" i++){
="" r="(area_pix[i]/255)-1;
" c="(area_pix[i]-(r*n_cols))-1;
" r<n_rows;="" r++){="" left="" to="" right
="" hit="true;
" while="" (hit)="" {=""
="" if(index[r][c]="=1){
" }
="" else="" {
="" c++;
="" if="" (c="=n_cols)" }
}
for(r="n_rows;">0; r--){ //Right to Left
c = n_cols;
hit = true;
while (hit) {
if(index[r][c]==1){
hit=false;
}
else {
index[r][c] = 0;
}
c--;
if (c==0) hit=false;
}
}
for(c=n_cols; c>0; c--){ //Top to Bottom
r = n_rows;
hit = true;
while (hit) {
if(index[r][c]==1){
hit=false;
}
else {
index[r][c] = 0;
}
r--;
if (r==0) hit=false;
}
}
for(c=0; c>n_cols; c++){ //Bottom to Top
r = 0;
hit = true;
while (hit) {
if(index[r][c]==1){
hit=false;
}
else {
index[r][c] = 0;
}
r++;
if (r==n_rows) hit=false;
}
}
area_pix_cnt=0;
for(r=0; r<n_rows; r++){
="" for(c="0;" c<n_cols;="" c++){
="" if(index[r][c]="=1" ||="" index[r][c]="=2){
" n="((r)*256)+" (c+1);
="" area_pix[area_pix_cnt]="n;
" image256[n]="255;
" area_pix_cnt++;
="" }
="" }
}
="" *this="" is="" for="" the="" smaller="" circle*=""
for(r="0;" r<n_rows;="" index_inner[r][c]="2;
" }
}
=""
for(i="0;" i<area_pix_cnt;="" i++){
="" r="(area_pix[i]/255)-1;
" c="(area_pix[i]-(r*n_cols))-1;
" r++){="" left="" to="" right
="" hit="true;
" while="" (hit)="" {=""
="" if(index_inner[r][c]="=1){
" else="" {
="" c++;
="" if="" (c="=n_cols)" }
}
for(r="n_rows;">0; r--){ //Right to Left
c = n_cols;
hit = true;
while (hit) {
if(index_inner[r][c]==1){
hit=false;
}
else {
index_inner[r][c] = 0;
}
c--;
if (c==0) hit=false;
}
}
for(c=n_cols; c>0; c--){ //Top to Bottom
r = n_rows;
hit = true;
while (hit) {
if(index_inner[r][c]==1){
hit=false;
}
else {
index_inner[r][c] = 0;
}
r--;
if (r==0) hit=false;
}
}
for(c=0; c>n_cols; c++){ // Bottom to Top
r = 0;
hit = true;
while (hit) {
if(index_inner[r][c]==1){
hit=false;
}
else {
index_inner[r][c] = 0;
}
r++;
if (r==n_rows) hit=false;
}
}
/*combine together*/
area_pix_cnt=0;
for(r=0; r
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<list> First: use some formatting (<pre> tags work great)
Second: Replace all your < and > with '<' and '>'
Third: Smells like homework
Fourth: Please narrow your problem down. We have no clue what problems you want to solve with our help
Improve your post at those points and ask again.
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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you sum up so good so many anonymous posts... ![Rose | [Rose]](https://codeproject.freetls.fastly.net/script/Forums/Images/rose.gif)
when i see plain code like this, i don't even bother reading any code line...
TOXCCT >>> GEII power
[toxcct][VisualCalc]
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toxcct wrote:
you sum up so good so many anonymous posts...
Thanks! I feel flattered  .
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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Bob Stanneveld wrote:
I feel flattered
you are...
in the other hand, i don't have enough word to criticise those "spamers"... 
TOXCCT >>> GEII power
[toxcct][VisualCalc]
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toxcct wrote:
in the other hand, i don't have enough word to criticise those "spamers"...
I don't think that we should criticise them for a few reasons:
<list> I don't want to waste too much time on them
If they get all the critics, they might do it for fun (try and post a programming question in the lounge and see how many angry reactions you get  )
It's bad for your health if you worry too much about it
...
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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How Dare you?, How can you use you hand for Writing 
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
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I didn't do it, but my fingers itch when I think about it ...
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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Bob Stanneveld wrote:
It's bad for your health if you worry too much about it
thank you so muck Ô sir Yoda...
i'll think about it, really 
TOXCCT >>> GEII power
[toxcct][VisualCalc]
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I created an SDI application. When i click on one of the menu items a dialog box pops-up. I want the values of a few variables that are declared as public in the View class to be accessed and modified in the dialog box. I tried creating an object of the view class in the dialog class, but doesnt work.How do i do it? Please Help.
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Use
CMyView* myView = (CMyView*)AfxGetMainWnd()->GetActiveView();
to get a pointer to the view.
Rahim Rattani
Software Engineer,
Matrix Systems (Pvt) Ltd.,
Karachi - Pakistan
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nripun wrote:
I tried creating an object of the view class in the dialog class
 Errr, I think this is not a good solution 
What you need to do is, when creating your dialog, send the variables to the dialog (using a public member function) before calling DoModal. Exemple:
CYourDialog::CDialog
{
public:
void SetVariable(int Value) { m_ViewVar = Value; }
private:
int m_ViewVar;
}
Then when creating your dialog you can do that:
CYourDialog Dlg;
Dlg.SetVariable(Variable);
Dlg.DoModal();
So nowm inside your dialog class know the value of the variable from your View. If you need to retrieve it, the same, add a member function to retrieve the value.
Why using functions and not public variable ? In fact this is a good habit to have: your member variables should be private (or protected in case of inheritance) and they can be accessed through Get/Set methods...
Hope this helps
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When EV_BREAK event indication is received on COM port?Whether serial device connected with serial port gives an EV_BREAK event report when it lost its connection with PC serial port??
Now I want to monitor my serial device connected with serial port and give a immediate report when it lost its connection.So I want to set EV_BREAK mask on COM port and decide to break my program when conn lost.
Is it OK?
Thanks.
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Hello,
The EV_BREAK event is not reaised when the connection is lost. You should try the EV_ERR event. Look here[^] for more info on serial events.
Breaks are some special action that some devices send across the network. It is sometimes used to determine which device is allowed to send data.
Hope this helps.
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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Hello..
I am using a ComboBox to accept phone number from the user.. I want this phone numbers to be saved so that they can be used next time when the application is run.. How should i go about this?
regards
pallavi
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mpallavi wrote:
saved so that they can be used next time when the application is run.
There no persistence COMBO box exist in Window MFC libaray. So you have to save it your own either in registry or a FILE and Display whenever needed
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
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Have them written in a flat file when application is closing, And read them back to combo while initializing application.
<bold>- Nilesh
<italics>"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw
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Thank you..
I added a class that keeps track of the history.. i deleted the .clw file.. how do i regenerate it.. please tell me step by step.. I am coding for the first time in VC++/MFC..
Regards..
pallavi
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