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hi all,
please answer the following problem
i have a custom control in a dialog which is in an MFC Extension Dll
a class in the DLL calls the DoModal (instantiates) the dialog
this class is then exported
when i call the class from an MFC exe the dialog does not show up!
but if the then entire activity is carried out in MFC .exe then the dialog shows up with the custom control
How do i launch the dialog from the DLL?
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You have to register the control in the exe as well.
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Hi,
You have to register the control twice - once in the dll scope, and once in the exe scope.
I do the registration of exe in the InitInstance, and the dll in DllMain.
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Hello,
I wanted to use CColorDialog as a child in my application. Can anyone tell me how to make it a Child dialog.
Although there is a funcition called CColorDialog Create but it takes a template and a pointer to parent. Now what to give it as a tempalte.....it should use the default template for CColorDialog i guess, but i dont know how to specify this. Can anyone help please ?
Thanks
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There is no way. The Common Dialogs are not designed to run as child windows. Microsoft calls this "Behaviour by design", and unfortunately there's nothing you can do about it.
If you're trying to build a Paint-like application that has a color selection window that the user can use to pick up pen/box colors or something like that, then the only way you can implement such a window is to create it yourself, bottom-up. I'm not sure if there are any examples available in Code Project, but creating it yourself is good practise anyway 
To use the CColorDialog properly, you first create an object of CColorDialog, then call DoModal to display the color dialog. When user has selected color and dismisses the dialog screen, you can use the member functions of the class to retrieve the selected color. Do NOT call Create yourself, but allow the framework to do it for you.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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I really have no single idea how to display a graphic on my Pocket PC application. I am using the MFC API. Have been trying all the codes given, but they don't seems to work. Have no idea where to place the codes.  Any kind soul please help. Thanks. 
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HI ,,,
I m using VC++ 6 and DirectShow
Compiling in Release mood + Using MFC Static Library
following errors there ,,, but when i change to Shared DLL
there is no such error
Linking...
LINK : warning LNK4049: locally defined symbol "_strrchr" imported
thanx
Strmbasd.lib(wxdebug.obj) : error LNK2001: unresolved external symbol __imp__sprintf
Release/cam.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
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The error messages imply that your link settings are bad. If you have manually changed to static linking, you are on your own - you'll have to make sure that all necessary libs are included in the link.
You are not likely to get many answers for questions like this, as you should first of all try looking up the error messages in the help or on MSDN, and that there are about a bazillion ways you can muck up the complier- and linker settings yourself.
Try creating a new project with the correct settings from the start, and copy the relevant files, then - if you are interested - check the differences in settings between the two. You might also want to read up on linker settings.
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Are you sure you are linking against one of these libraries?
LIBC.LIB Single thread static library
LIBCMT.LIB Multithread static library
MSVCRT.LIB Import library for MSVCRT.DLL
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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Hi,
please help me,how to display the TIFF file in MFC Application,i dont want to use CXImage given in codeproject and any other library ,please specify any other way to do it.
Bye
-Mahatma
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Hi..dear..
Use LibTiff Library..This is Direction...
Check material on internet..
Bye
Never consider anything Impossible before trying to solve that..---Sumit Kapoor--- sumit_kapoor1980@hotmail.com
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Hi Sumit,
You have given one application that converts from bmp to tiff actually it is not working it is getting access voilation at line
m_Bitmap->GetBitmapBits((600*600) ,bmpBuffer);
can u give me fair solution,and u also give me a plugin that converts from tiff to bmp convertion.
thank you ![Rose | [Rose]](https://codeproject.freetls.fastly.net/script/Forums/Images/rose.gif)
-Mahatma
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Hi! Can you please help me on how to get all URLs placed in the Address Bar... Is it also placed in the "regedit"?! Also, the info regarding all commands typed at "Run" Line... thanks in advance!!!
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Yes it stored in registry at this position.
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\TypedURLs
-----------------------------
"I Think It will Work"
Formerly I AM Known As "Alok The Programer"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk
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But the URLs inputted in this Registry Key is Limited... I want to know how I can Log the URL of the link Clicked by the User.... tnx for the Information...
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You'll need to look in the C:\Documents and Settings\<user id>\Local Settings\History folder.
"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
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Hi
Just a question on Pointer
In C++ used on embedded system, memory leak is very critical.
so i used example
LPTSTR ptrText = new _TCHAR[MAX_PATH];
when i exit, i use
if(ptrText)
{
delete[] ptrText;
ptrText = 0;
}
Just wonder if the ptrText = 0; is necessary?
Another is will the use of new and delete slow down the system?
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IceBerG71 wrote:
Just wonder if the ptrText = 0; is necessary?
It is not necessary, however it is a good habit to do so, because if some code later tries to dereference ptrText, after the delete[], the app will crash immediately and you will catch the bug.
--Mike--
Personal stuff:: Ericahist | Homepage
Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ
----
"Linux is good. It can do no wrong. It is open source so must be right. It has penguins. I want to eat your brain."
-- Paul Watson, Linux Zombie
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Thank You. So Is There Performance Related Issue When using new & delete rather than just use the normal char declaration?
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There is not.
When you declare normal variables, the memory they take is reserved from the stack. On mobile systems, the stack memory is extremely limited, so heap memory should be used instead. New & delete operators operate on the heap memory area.
There should be no performance hit, although reserving large quantities of memory (over 1 Mb) may cause small performance hits. So, if you need to reserve large quantities of memory, you should do that in sections whenever possible.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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Anonymous wrote:
So Is There Performance Related Issue When using new & delete rather than just use the normal char declaration?
Yes. One requires help from the memory manager, while the other does not. However, the "penalty" is negligible.
It's also not uncommon for the new operator to be used incorrectly. For example:
char *name = new char[32];
lstrcpy(name, _T("David"));
m_listbox.AddString(name);
delete [] name;This is highly unnecessarily. Consider this instead:
char name[32] = _T("David");
m_listbox.AddString(name);
"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
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I would argue that setting the pointer variable back to NULL after deleting the object is critical and highly recommended. If you do not, you are leaving a dangling reference to something that no longer exists. Once the memory is deallocated, by delete, the memory can be used for something else by another part of the program. If someone else is checking the pointer value against NULL, then the reset of the ptr to NULL will prevent a crash. My philosophy is that if the pointer doesn't point to anything then it should be null. NEVER EVER leave a pointer set to an address that is no longer pointing to a valid object. That is just asking for trouble in my mind. Of course deleting an object in the middle of program execution is tricky to begin with. There has to be an understanding between the piece of software responsible for deleting the object and the piece(s) of software using the pointer. Setting the pointer back to NULL is a simple way of establishing that understanding. If the pointer is NULL, don't use it!
//perhaps this is done in the constructor of a class and the pointer
//mlpszFilePath is a member variable of some class.
LPTSTR mlpszFilePath = NULL;
//Now in some member function you do this:
//Only build the string if it has not already been built
if(lpszFilePath == NULL)
{
mlpszFilePath = new _TCHAR chFilePath[_MAX_PATH];
}
//later you'd do this:
//Only delete the array if it has been previously allocated; perhaps in a class destructor.
if (mlpszFilePath != NULL)
{
delete[] mlpszFilePath ;
mlpszFilePath = NULL;
}
//Perhaps you have a function to get the pointer
const LPCTSTR GetPointer() const
{
return mlpszFilePath;
}
Perhaps a string is a bad example but you might have this kind of code where you have to new and delete some object that is placed in the global scope via a pointer variable that many components of an application need access to. Notice that the setup allows the same object to be reused over and over.
This type of pattern is very common and sort of applies to your other question about performance surrounding new and delete.
Yes, new and delete require system resources like any function call or calculation; but the operating system is designed to perform memory management for you so that you don't have to worry about it.
If you are only rarely using new and delete to allocate a string it's not a big deal. If you are doing it thousands of times in a second, then that could be a problem.
If the function using the string only uses the string within the block of the function, you might as well make it static or just make the string local to that scope in your program. If the string needs to continue to exist after the function completes, you have to use 'new' otherwise the string will not exist after the function call. lets say you are passing the string to another function and then the function creating the string ends. Well if you don't use new in that case, the string goes out of scope when the function creating it ends and the function you passed the pointer to is out of luck and has a dangling reference to an object that's been deallocated.
I know nothing about your application and have no idea whether to use new or delete vs. a static character array. It all depends on what you need the string for. It's totally situational. Do not be afraid to use new and delete if you have a legitimate purpose for doing so. That is why the operations exist.
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I want to override the behaviour of WM_NCCALCSIZE and WM_NCPAINT to properly calculate the border sizes and then handle the painting of these borders for controls in my framework. So far I have it working perfectly for cases where no scroll bar is present. However if the control has the WS_HSCROLL or WS_VSCROLL style set then there are problems. In WM_NCCALCSIZE i am accounting for the presence of the scrollbar. But when the scroll bars are visible they never show up! Sometimes when I click in the right spot I can get them to appear, but the don't get redrawn correctly. Is there some other step I am missing?
¡El diablo está en mis pantalones! ¡Mire, mire!
Real Mentats use only 100% pure, unfooled around with Sapho Juice(tm)!
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