C / C++ / MFC Discussion Boards

hi.. my program is about to capture the dektop by creating compatible dc and compatible bitmap and than convert it from ddb to dib. But I want to compress it before storing it in DAT format. How to proceed with this

prashant

   Since you mention a specific format (DAT), it is unclear if you mean that you want to scale the image before storing it, or if you really mean data compression.

   Scaling can be done in a coarse fashion by drawing the image to a target DC with reduced target width and height values. GDI+ offers functions that may make a better quality image, as will a dedicated graphics library.

   If you really mean data compression, which should happen after the image is first converted to its target format (DAT?), then you can use a library like ZLIB[^].

   Lastly, if you meant tape backup (or other offline/removable storage) when you said "DAT", then ZLIB helps there, too.

   Peace!

-=- James
Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles

Thanks James for reply.I mean data compression. I will go through the link about ZLIB. Thanx

prashant

Hi guys
i want to detect Floppy arrival but 'WM_DEVICECHANGE' does not work for floppy so is there anyway to detect Floppy arrival.

with regards
RYK

VC_RYK wrote:
i want to detect Floppy arrival but 'WM_DEVICECHANGE' does not work for floppy so is there anyway to detect Floppy arrival.

Actually Floppy Drive doesn't work the way CD Drive work. I mean, you could simply put Floppy in the drive, but to make Computer aware you have to click on floppy icon, which is not in case of cd drive. thats just my logical conclusion!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

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

I think its not good way but he can uses of SetCurrentDirectory check return value if its nonzero it has floppy.

Hamid. wrote:
I think its not good way but he can uses of SetCurrentDirectory check return value if its nonzero it has floppy.

But you have to poll regularly for that.. i don't think thats good design and could present user headache, as if floppy is corrupt, it could hang the system!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

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

Well I said its not good idea but I dont think it hang the system.

Hamid. wrote:
Well I said its not good idea but I dont think it hang the system.

well you have to test that yourself Poke tongue | ;-P

try putting corrupt floppy into your computer and acess it through My COmputer!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

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

I dont use of floppy disk.;P

Hamid. wrote:
I dont use of floppy disk.

USe ZIP Drive then Poke tongue | ;-P

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

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

Ok

   PC floppy drives have (or used to have) a active low Disc Change line, which went high (1) when the drive was empty and was low (0) when a disc was inserted.

   Not sure if/how you can get direct access to that line on Win32, though...

   Maybe there is an LVM routine that can be used?

   Peace!

-=- James
Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles

with the help of WMI, you can find out the arrival and removal of floppy drives and offourse all other drives.

nave

[OpenedFileFinder]

Naveen.R wrote:
with the help of WMI, you can find out the arrival and removal of floppy drives and offourse all other drives.

Hi Naveen,
could you please help me in finding out the exact WMI Class , which could help me in this purpose.. it could work as wonderfull tip for my FAQ site. if you allow i will publish that with you name.

Thanks
Alok

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

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

I saw two classes Win32_FloppyController/Win32_FloppyDrive.

ThatsAlok wrote:
could you please help me in finding out the exact WMI Class

Any thing for you sir Smile | :)

Actaully I tried this for one of my project requirment. I used the ExecNotificationQueryAsync() function with the following query.

HRESULT hres = pSvc->ExecNotificationQueryAsync(<br />
        _bstr_t("WQL"), <br />
        _bstr_t("SELECT *" <br />
         "FROM __InstanceOperationEvent WITHIN 1 "<br />
         "WHERE TargetInstance ISA 'Win32_LogicalDisk'"), <br />
         WBEM_FLAG_SEND_STATUS, NULL, pStubSink );

And in the notification handler we can check the instance is __InstanceCreationEvent and __InstanceDeletionEvent for any drive arrival or removal. But if you want disk arrival or removal you may need to handle the __InstanceModificationEvent( this one i didnt check ).

nave

[OpenedFileFinder]

Hi all,

Say I have a CString and I want to assign the current system date on a MFC application click event. How can I do it.

Thanks

I appreciate your help all the time...
Eranga Smile | :)

Eranga Thennakoon wrote:
Say I have a CString and I want to assign the current system date on a MFC application click event. How can I do it.

CTime::GetCurrentTime and CTime::Format!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

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

use as follows
CTime time;
CString str;
time=CTime::GetCurrentTime();
str.Format("%d:%d:%d",time.GetDay(),time.GetMonth(),time.GetYear());
good luck.

-----------------------------------------

Suggestion to the members:
prefix your main thread subject with [SOLVED] if it is solved.
chandu.

i might beat you by second!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

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

All are beat me here by years of experience at all. Cry | :((

Thanks for you replay as well. Smile | :)

I appreciate your help all the time...
Eranga Smile | :)

yah good.
one funny thing happened you know,
as per the practice,
after i punch few lines of code in the editor, automatically, my index finger hits the F7 key to build the code and my lefthand hits the escape key to exit the output window.
the same hapenned in my previous post. but when i hit escape, the content i typed got disappeared. again i had to retype the post. thats why you are fast.
you can try out this logic. its funny.;P

Had you immediately hit Ctrl+Z, your text would have reappeared.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

;Pyah its working. Big Grin | :-D

thank you. Laugh | :laugh: