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Hello,
I copied a large file from one disk(source) to another disk(destination). After this I made (manually or programmatically) some changes in the file on the source disk. Now, these changes should reflect in the file on the destination disk also. In order to achieve this, I copied the file again from source to destination. Since the file is a large one this method is not efficient. Because, for any minute change, I have to copy the entire thing.
Is there any way to copy only the updated portion from the file on the source disk to the file on the destination disk?
Hoping to get a reply soon.
Thanks in advance.
regards,
Jahfer V P.
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When you are making changes to the file, make another file (changes-file) also, with your own file format:
Repeat (1) below for every change:
1- The size of data in four bytes (long int) then four bytes (long int) for offset into the file for the data, then the data. Write this into your "changes-file".
Then when you need to update the destination file, repeat (2) below until the end of the file.
2- Read the "changes-file", and correctly read the length of data, offset of data, and the data. Then open the destination file in update mode, move into it at the correct offset, and write out the data you read from the "changes-file".
Does that solve the problem?
this is this.
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Dear khan++,
That doesn't solve my problem, because I am not the person going to update the file. More over, the file may get updated not only at its end but anywhere in it.
Any other idea?
regards,
Jahfer V P.
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jahfer wrote:
because I am not the person going to update the file
I don't get it.
The technique I gave can update the file anywhere in it, not just the end, that is why I asked for an offset field.
I hope someone else can help as I am about to logout for the day.
this is this.
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Could any body provide me basic algorithms for Fading IN or Fading Out of the Image and other related EFFECT.
Thanks
"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 haven't done such a fade in filter but for a smooth
transition--one image fading to another--I'd guess you
just need to scale each pixel's R,G & B values in the
'old' image toward the R,G & B values of the corresponding
pixels in the new image.
e.g if you want to do a full fade from old image to identically
sized new image in 10 steps :
for ( each pixel position in the image(s) ){
<font color=#FBEDB5>__<font color=#000000>for (Step = 1; Step<=10; Step++){
<font color=#FBEDB5>____<font color=#000000>IntermediateR = OldR + (NewR-OldR)/10 * Step;
<font color=#FBEDB5>____<font color=#000000>IntermediateG = OldG + (NewG-OldG)/!0 * Step;
<font color=#FBEDB5>____<font color=#000000>IntermediateB = OldB + (NewB-OldB)/10 * Step;
<font color=#FBEDB5>__<font color=#000000>}
}
(Be sure to use signed types for the RGB values so that
the scaling will correctly handle the cases where R, G or B
in the old image are larger than the corresponding R, G or B
value in the new image.)
If you want to fade to (or from) a 'blank' screen just substitute
the constant 'blank' RGB values for the new (or old) image pixel
position RGB values as required.
Steve T
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Thanks I will try it 
"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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hi i am making a appliocation which facialates the procedure of student admission in a college...
i hav made a database name "Students" which has 3 tables "student","fees","course" the objective of each table is clear by its name i suppose...
now i have made a odbc object to link the databse in my mfc project...
i want to know that how i use the data of all the 3 tables at the same time...
ie i have designed 3 forms in the same project for each of the 3 tables...now i want to link the tables with the forms...how to do so???please help....
i wud b thankful...this is my first question...so please sorry for making it a long one!!!!
thanks manav
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thanks a lot but i am unable to find any info regar4ding how to use multiple tables in my application...please help....
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smartymanav wrote:
but i am unable to find any info regar4ding how to use multiple tables in my application
Have a Try on this Mr. Manav,
http://www.codeproject.com/database/caaadoclass1.asp[^]
I Believe it's yours personel project at MNR
"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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thanks again but i am using odbc...
no its not my personal project in my college...i am doing training in stpi and they hav given me this project to design for a college(private)..they have said that if they lie it they will recomend it to the private colege...
please help...
i just want to know how to use multiple tables....i know to make use of the database which only has a single table in vc++ using odbc...
thanking u
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Then Use this:-
http://www.codeproject.com/database/caaodbcclass.asp[^]
Buddy,Take my advice:- learn Goggling, otherwise it very difficult to survive in Software Field 
smartymanav wrote:
...i am doing training in stpi
STPI : Stands for Software Technology Park or India. AFAIK, there are more than 10 STPI in India. In which one are you working!
"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 am in noida branch of stpi....
ya i have reached this site by googling only!!!
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smartymanav wrote:
i am in noida branch of stpi....
There are three Stpi in Noida, One in Sec 29 Ganga Shopping Complex, Second Logix Park Sector 16 and Last One Electronic City Sec 62-63.
In which One are you working
"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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hey u know a lot!!!
i am in ganga shopping complex sec 29.....
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smartymanav wrote:
am in ganga shopping complex sec 29.....
So u are in birlaSoft
"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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do u live nearby!!!!
no actually birla soft is also here...
i am in stpi only....they have a training division....they give out projects there
byeee
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hey do u live near by!!!!
ya u r rite...birla soft is also here but i am in stpi only
they have a training division and they give out projects here
byeeee
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smartymanav wrote:
hey do u live near by!!!!
Nope Work NearBY
smartymanav wrote:
they have a training division and they give out projects here
Ok nice
"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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smartymanav wrote:
where????
Thats Secret
"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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Your post is a little confused.
Do you want to populate each form with data from the matching database table or do you want to select data from multiple tables and display in one form?
Which Database classes are you using? CDatabase? ADO?
I recommend you use ADO, which you can use your ODBC connection with.
Have a look at these classes[^], as they'll make it easier.
Michael
CP Blog [^] Development Blog [^]
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