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Catching WM_SYSCOMMAND with SC_CLOSE works, thank you.
KR
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KellyR wrote: How can I do this? I tried catching the WM_DESTROY message and not running a PostQuitMessage(0)...
Did you try to simply return 0?
KellyR wrote: ...the application window is still destroyed.
That's because the WM_DESTROY message is sent after the window has been removed from the screen. Try WM_CLOSE instead.
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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... simply return nothing.
--
=====
Arman
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I've tried that, it doesn't work; the application process continues to run but the window closes.
KR
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CWnd::OnDestroy() is a void function... 
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
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James R. Twine wrote: CWnd::OnDestroy() is a void function...
Yes, but MFC was not mentioned in the OP. The WM_DESTROY message does expect a return value, however.
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Hi all:
I have some experience using C programming, but for C++, so many libraries have been added to it.
The task I am supposed to perform is to check if a text file can be opened, which is input a command in line parameter, e.g. argv[1].
The first line of code given by my lecturer is:
ifstream in(argv[1], ios_base::binary);
I am stuck right here. Am I supposed to check the return value of ifstream? Or am I supposed to employ a member function of ifstream, but which one?
Thank you.
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Generally, you need to learn C++ to fully understand what is happening. Anyway, the code is simple and a common way of opening a file [well, trying to open].
ifstream in(argv[1], ios_base::binary);
Here you declare and define an object whose type is ifstream. ifstream is a class responsible for file input operations. You pass the path and an optional ios::binary arguments to its constructor. Ok, to check whether the operation succeeded, you can do one of the following;
if (in)
{
}
if (in.is_open())
{
}
In the first case, the overloaded operator bpol gets invoked implicitly. In the second case, you explicitlly call a function [which returns bool].
--
=====
Arman
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C_Zealot wrote: ifstream in(argv[1], ios_base::binary);
That line constructs an instance of the ifstream class as a variable called in, passing two parameters (argv[1], ios_base::binary) to the constructor.
You then use the members of in to manipulate the data contained in the file referred to by argv[1]. You will have to take it upon yourself to lookup information on the ifstream class to see how you should use it.
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
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C_Zealot wrote: Or am I supposed to employ a member function of ifstream, but which one?
Have you tried is_open()?
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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C_Zealot wrote: I am stuck right here. Am I supposed to check the return value of ifstream? Or am I supposed to employ a member function of ifstream, but which one?
You need to check if ifstream in is a valid stream. It's an object so you need to call it's is_open(), good(), or bad() function.
if(!in.is_open())
cerr << "File didn't open correctly!";
if(in.bad())
cerr << "File bad bit is set!";
if(!in.good())
cerr << "File is not good for use!";
You can also just do:
if(!in)
cerr << "File didn't open correctly!";
Which I believe checks if the file opened, but does NOT check if the any of the bad bits are set (could be wrong).
I recommend the in.good() approach, personally, as it checks everything for you.
My favorite pure C++ reference site. Goes great alongside MSDN.
http://www.cplusplus.com/reference/iostream/ifstream/[^]
Good luck
-- modified at 14:41 Wednesday 23rd May, 2007
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I'm trying to make a program that will loop the end where it takes in all the information in the "LIBRARIANSHAVE347CATS.DAT" and if the book has more then 200 pages it outputs the information to a different file called "bigbook.dat"
This is my code so far:
struct card_catalogue
{
float dewey;<br />
string title;<br />
string author;<br />
int released;<br />
int num_pages;<br />
enum typeofbook {fiction = 1, nonfiction, reference, pond};<br />
};<br />
<br />
int main()<br />
{ <br />
card_catalogue books;<br />
ofstream outfile;<br />
int i;<br />
bool rerun = 1;<br />
ifstream infile;<br />
ofstream outfilebb;<br />
<br />
outfile.open("LIBRARIANSHAVE347CATS.DAT",ios::out);<br />
while(rerun)<br />
{<br />
cout<< "Enter the Dewey Decimal Number please: ";<br />
cin>> books.dewey;<br />
cout<< "Enter the Title of the book please: ";<br />
getline(cin, books.title);<br />
cin.ignore(80, '\n');<br />
cout<< "Enter the Author of the book please: ";<br />
getline(cin, books.author);<br />
cout<< "Enter the Year of Release please: ";<br />
cin>> books.released;<br />
cout<< "Enter the Number of Pages please: ";<br />
cin>> books.num_pages;<br />
cout<< "<-----Type----->"<<endl; <br />
cout<<"1 - Fiction" <<endl<br />
<<"2 - Non-Fiction" <<endl<br />
<<"3 - Reference" <<endl<br />
<<"4 - pond"<< endl;<br />
cout << "Enter the type: ";<br />
cin >> i;<br />
<br />
<br />
if(i == 1)<br />
{<br />
cout << "You chose Fiction\n";<br />
}<br />
if(i == 2)<br />
{<br />
cout << "You chose Non-Ficiton\n";<br />
}<br />
if(i == 3)<br />
{<br />
cout << "You chose Reference\n";<br />
}<br />
if(i == 4)<br />
{<br />
cout << "You chose Pond\n";<br />
} <br />
<br />
<br />
<br />
if(outfile)<br />
{<br />
outfile << books.dewey;<br />
outfile << books.title << endl;<br />
outfile << books.author << endl;<br />
outfile << books.released << endl;<br />
outfile << books.num_pages << endl;<br />
outfile << i << endl;<br />
}<br />
else<br />
{<br />
cout << "An error occurred while opening the file. \n";<br />
}<br />
cout << "Do you want to run this program again? Press 1 if so, 0 if no." << endl;<br />
cin >> rerun;<br />
}<br />
outfile.close();<br />
<br />
<br />
<br />
<br />
infile.open("LIBRARIANSHAVE347CATS.DAT",ios::in);<br />
outfilebb.open("Bigbook.dat",ios::app);<br />
while(infile)<br />
{<br />
infile >> books.dewey;<br />
infile >> books.title >> endl;<br />
infile >> books.author >> endl;<br />
infile >> books.released >> endl;<br />
infile >> books.num_pages >> endl;<br />
infile >> i >> endl;<br />
<br />
<br />
if (books.num_pages > 200)<br />
{<br />
if(outfilebb)<br />
{<br />
outfilebb << books.dewey;<br />
outfilebb << books.title << endl;<br />
outfilebb << books.author << endl;<br />
outfilebb << books.released << endl;<br />
outfilebb << books.num_pages << endl;<br />
outfilebb << i << endl <<endl;<br />
<br />
}<br />
}<br />
}<br />
outfile.close();<br />
infile.close(); <br />
return 0;<br />
}
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Ok, so what exactly is the problem?
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Hello,
Can I change the CREATESTRUCT& cs without calling PreCreateWindow function in the ChildFrame and assign it to the window class procedure AfxRegisterWndClass()
Prithaa
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What does mean "without calling PreCreateWindow"? The window class should be registered before the window gets created. To modify a window class, an ideal place is PreCreateWindow. If the window has already been created then you still may change separate attributes [of the window class] by using SetWindowLong, SetWindowLongPtr, SetClassLong..
--
=====
Arman
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prithaa wrote: Can I change the CREATESTRUCT& cs without calling PreCreateWindow function in the ChildFrame
Do you mean without calling the base class PreCreateWindow()?
If so, then yes. If you want to use a different window class than the default MFC class then
you'll want to call AfxRegisterWndClass() sometime before you create the window (I personally
do this in the constructor). In your PreCreateWindow() override, set the class name in the
createstruct to the name of the class you registered.
Mark
"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder
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hello,
Thanks for all your replies.
I mainly want to change the menu of the child window for which I want to change the CREATESTRUCT& cs.hMenu.
But even if I assign cs.hMenu = mynewmenu which is an object of CMenu I fail to see the new menu when the child window appears but
if I assign cs.lpszName = "my Window"; then the title changes of the child window.
I don't know why the menu does not take effect but the title of the window changes
Thanks
Pritha
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Can child windows have a menu? According to the docs, the HMENU is an integer ID when the
window is a child.
"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder
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Hi.
I have developed a program in Visual C++, MFC.
When I finished I ordered all the .h and .cpp files in folders, and then changed all the includes so that it could work fine.
It works, there is no error. but now when I open the class wizard it is empty. I think that it may be looking for the files in the old place. So, how can I say to the class wizard that now all the files are in another folder? Thanks.
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Class wizard information is saved in a *.clw file. Delete this file and open class wizard again. It will ask you to rebuild class wizard info from source file, say yes. You will be able to select all your files once again.
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Gosh!!! Thanks a lot!! I love you!!! 
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