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How to use WIA in VC 2005,I have read the tutorial and understand it,but it is not working as it should be i have a camera installed and it is also being used by window application like window movie maker.but my VC++2005 application is not able to enumerate and get properties off devices installed.Kindly someone please help me.
Tasawar Gulzar
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did you look at the WIA Sample on MSDN[^]
"Alot of the people on this forum are incredibly stupid, thinking that the internet is real"
Score: 1.0 in the Soap Box
led mike
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I have written that i have read and applied tutorial.offcource these tutorial were from MSDN
Tasawar Gulzar
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Yes but the sample could be built and then run to test with your hardware correct? Have you don that?
"Alot of the people on this forum are incredibly stupid, thinking that the internet is real"
Score: 1.0 in the Soap Box
led mike
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yes i have done that.if you have experience of that when u have a pointer of roperty storage to all the device attached. my device is attached and working properly but my the property storage pointer is null this mean that my application is not getting any pointer to any of the devices.I hope if u have WIA expeience you understand what i am sying and what is my problem
Tasawar Gulzar
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tgchuhan wrote: I hope if u have WIA expeience you understand what i am sying and what is my problem
No I have NO WIA experience. I do however understand that if the "sample" project works with your hardware and your application DOES NOT, then there is a problem with your code. I still cannot determine from your posts if the "sample" application works with your hardware.
"Alot of the people on this forum are incredibly stupid, thinking that the internet is real"
Score: 1.0 in the Soap Box
led mike
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I have a propertypage and the first page is a listctrl. The whole
propertypage is a listctrl.
If I put alot of data in the listctrl, scrollbars to the right
appear on the listctrl and they also appear on the propertypage.
Is there any way for the listctrl and the propertypage to sort of
become one or work together more? I dont like the 2-scrollbars but I
can probably figure out a way to remove the scroll from the property
page. If I try to increase the width of the propertypage, the listctrl
doesnt increase with it. Instead a gap appears between the listctrl
and propertypage end. I tried making the first propertypage a ListView
but I could get it to compile.
My main question is, is there a better way for the listctrl and property
page to work together? Any response, any sample project, any direction
any one can give me will be greatly appreciated.
Sincerely,
Danielle Brina
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I'm a little confused.
Do you want the property page to actually grow vertically together with the list control if the data in the list control overruns the initial size?
Why don't you just fix the size of the list control AND the property page and allow the list control's vertical or horizontal scroll to do its job?
Mark
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> Do you want the property page to actually grow vertically together with the > list control if the data in the list control overruns the initial size?
Yes. Sort of make the listctrl grow dynamically with the property page.
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DanYELL wrote: Sort of make the listctrl grow dynamically with the property page.
So the property page is sizable?
"Talent without discipline is like an octopus on roller skates. There's plenty of movement, but you never know if it's going to be forward, backwards, or sideways." - H. Jackson Brown, Jr.
"Judge not by the eye but by the heart." - Native American Proverb
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DanYELL wrote: I have a propertypage and the first page...
Do you mean the first page of a property sheet has a list control? 
"Talent without discipline is like an octopus on roller skates. There's plenty of movement, but you never know if it's going to be forward, backwards, or sideways." - H. Jackson Brown, Jr.
"Judge not by the eye but by the heart." - Native American Proverb
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I was looking at the WinSpy artical (http://www.codeproject.com/threads/winspy.asp), which describes how to extract text from any control (I think it uses WM_GETTEXT).
But this doesn't work on windows that display rich text. Does anyone know how to get to extract the text in this case?
By the way, I'm not sure that the window in question is the rich edit control. It says that it is a "AfxFrameOrView" class, but that could just be the parent window.
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Richtext is not added to a control with a simple sendmessage, it is streamed in and streamed out a little at a time. If you wanted to use a similar method to winspy, you would need to write the whole streaming functions and inject a callback.
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Thanks for the answer!
Do you know any working example that does that?
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Now, I found some code to extract the text using EM_STREAMOUT, but it doesn't work. It could be that the window is not a rich edit control. It there anyway to test if the window is a rich edit?
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when u get a handle of window. Use GetClassName to get class of window. Compare it with "RICHEDIT".
nave
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Nevermind, I figured another way to do it.
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Hi !!!
Did somebody know some really good Refactoring tool for C++?
Thanks.
Bye.
-:KNOX:-
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I'm using a parent class that holds pointers to child classes (parent-child is the application's terminology, not indicating heirarchy in c++).
The parent class has an array of pointers to children named "children"
To save space (and I need all I can get), I want to dynamically allocate this array. I have been using malloc/realloc with success in the past, but recently it's been reporting heap corruption:
"Heap block at 01720DD8 modified at 01720DE4 past requested size of 4"
before stopping at this line in memcpy_s.c:
"memcpy(dst, src, count);"
The realloc command in the code that is initiating the problem is indicated below. This array is initially malloc'd in the constructor of the class with a size of one child pointer.
bool parent::addchild(child *childToAdd){
//////////////////////////////
// Add child to children
//////////////////////////////
numchildren++;
children = (child**)realloc(children,(numchildren * sizeof(child*))); //<--Error occurs here
children[(numchildren-1)] = childToAdd;
return TRUE;
}
Thanks for any help
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Slightly different error in Debug (original post was for Release):
Heap corruption:
"Heap block at 01F13EA0 modified at 01F13ED0 past requested size of 28"
Stops at the end brace of this function in mlock.c:
void __cdecl _unlock (
int locknum
)
{
/*
* leave the critical section.
*/
LeaveCriticalSection( _locktable[locknum].lock );
}
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Read your error, the answer is there.
nadiric wrote: "Heap block at 01F13EA0 modified at 01F13ED0 past requested size of 28"
You requested a block of memory of size 28 bytes, it was given to you at address 01F13EA0, but you tried writing to it at address 01F13ED0 which is over the 28 byte limit. Basicly you are writing past the end of the array somewhere in your code.
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my code effectively stops at the realloc indicated, it never makes it past this line...?
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Run your code in the debugger, open the call stack window, and watch. When your code calls that function, there will be something like _invalid_pointer shown in the window. realloc() will check the memory for problems before doing what it should. Somewhere before calling the function, you have written past the end of the array. Just step through your code and look out for the address in the error message, thats when you will find your problem.
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nadiric wrote: children = (child**)realloc(children,(numchildren * sizeof(child*))); //<--Error occurs here
So you only allocate memory for an array of child* pointers (which is 4 bytes on 32-bit Windows), not an array of children?
Best,
Jun
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