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It throws an exception saying that heap memory has been changed after it was freed. I am not doing it , presumably the mfc framework is. Basically I have a simple dialog with a tree control . In response to various context menus I change the contents of the tree control. I do this by calling deleteAllItems() and then adding new items by pulling records from a table . When the dialog closes it is overwriting bits of the memory that where assosiated with the items I deleted .Hence the exception. I have worked around it now , but I must still be missing something obvious ?
Ain't nobody ever told you : There ain't no sanity clause .Groucho Marks
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Andrew Torrance wrote:
but I must still be missing something obvious ?
More than likely, but we won't be able to tell without seeing the code. We're not mind-readers ya' know. 
Joel Lucsy (jjlucsy@ameritech.net)
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I draw some text on CView as shown below. How can I be able to "copy and paste" it ?
void ClassDerivedFromCView::OnDraw(CDC* pDC)
{
CFinalReport5Doc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
pDC->TextOut(20, 20, "sample text output to be copy-and-pasted");
}
rsg_dj
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easy way: use CEditView
very hard way: use any other CView
CPUA 0x5041
Sonork 100.11743 Chicken Little
"So it can now be written in stone as a testament to humanities achievments "PJ did Pi at CP"." Colin Davies
Within you lies the power for good - Use it!
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I tried to use the CEditView but problem is I cannot break line.
eg
SetWindowText( "this is first line and \n this is second line");
Everything appears in single line, against my wish. Please help
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Hello friends,
Everytime I was interested in knowing how a Install Wizard works. knowing the OS, loading the necessary dlls, and creating the necessary directories etc. Can any body suggest some links or reading references on this? I know, there are some free wizards. I want my own. Thanks in advance. 
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it is terrible, don't study it.
the pack is targeted to both c++ and vb, for vb it is a help, for c++ it is a funny story.
to install your apps, to learn:
1. how to create short cut
2. how to add short cut to start menu and desktop
3. some copy file jobs.
that is all.
includeh10
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I think you may have a hard time finding anyone to help you re-invent the wheel . I have wanted to do things before that are already done well just so I could learn, but in general, people don't seem to have much to offer in that type of situation. I'll do my best to help, but I'm no expert on the subject.
First of all, I've never seen documentaion on this before, so you're on your own to track that down. Here's how I see it, though.
It seems to me that there are different paradigms for creating an installer creation tool. Microsoft, for instance provides a way to create an .msi installer with their installer tool that works with InterDev. Their model creates a virtual workspace in which there is a virtual filesystem, a virtual registry, and virtual installer screens. It is not highly versatile, but the model they use is very intuitive and great for simple installers.
On the other hand, you have a product like InstallShield which is far more robust, but not quite as intuitive. They give you the ability to script more complex things with a VB like programming language. The model they use leaves a lot to be desired in my opinion, but it is an effective tool once you learn it.
There are many others that I won't mention. The point here, I think, is that you want to roll your own. I think you have to just break down the problem in it's component parts and go from there. Answer these questions:
1. How do I find out the system directory programatically?
2. How do I create directories programmatically?
3. How do I register activex controls or dlls programatically?
4. How do I find out which OS my installer is running on programmatically?
5. How do I create shortcuts programmatically?
Once you know the answer to these questions, you can start coding it. However, you will also have to decide how you're going to create your executable that the end-user will install. I think what you get with many installers, is a way to bundle all of your files into a single file that can be executed. Keep in mind, I've never done this so it's probably speculation, but I believe what happens is this:
1. The installer creation tool creates the executable that is going to do the installing.
2. It also generates a layout file that contains directives as to where to place the files as well as registry settings. It becomes a script that your installer reads.
3. It then concatenates each of the additional files (e.g. the application .exe file, any .dll or .ocx files, etc) to the end of the installer .exe file keeping track of the offset of each file while it adds them.
Again, I have never done this, so it may not be the best information, but this is probably how I would approach it given your scenario.
Best of luck to you and Best Regards.
-Matt
------------------------------------------
The 3 great virtues of a programmer:
Laziness, Impatience, and Hubris.
--Larry Wall
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Hi!
I need a control to explore the hard drive and select files.
Can anyone suggest a control like this?
Thank you in advance
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Thank you, i'll try it out!
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How does one clear the edit box?
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The control is derived from CEdit, so do it the same way you would in an edit control:
m_FileEditCtrl.SetWindowText (_T(""));HTH
CPUA 0x5041
Sonork 100.11743 Chicken Little
"So it can now be written in stone as a testament to humanities achievments "PJ did Pi at CP"." Colin Davies
Within you lies the power for good - Use it!
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hi,
U can use the MFC - CFileDialog to do the same.
Rgds,
Sharad Ganesh
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Hello, folks,
I got one problem for setting the printing orientation programmedly(i.e, landscape or portait ) on my pop-up printer dialog.
My printer dialog is using class CPrintDialog and I know it has one member m_pd is of type PRINTDLG. And I also know structure PRINTDLG has a member called hDevMode, and its type is HGLOBAL and of type DEVMODE. And, DEVMODE has a member like this:
union {
struct {
short dmOrientation;
short dmPaperSize;
short dmPaperLength;
short dmPaperWidth;
};
POINTL dmPosition;
So, I know I can set the printing orientation here by setting the value of member dmOrientation.
My problem is, how to allocate memory for setting this orientation parameter ?
Could somebody give me a simple example ?
Any response would be appreciated !
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hi,
=>
To get the orientation u can do:
void GetInitOrientation()
{
PRINTDLG pd;
pd.lStructSize = (DWORD) sizeof(PRINTDLG);
if( GetPrinterDeviceDefaults(&pd)) {
DEVMODE FAR* pDevMode = (DEVMODE FAR*)::GlobalLock(m_hDevMode);
if(pDevMode) {
nStartupOrientation = pDevMode->dmOrientation;
::GlobalUnlock(m_hDevMode);
}
}
}
=>
To set the orientation:
This does not actually invoke the print dialog
void SetOrientation(int mode)
{
PRINTDLG pd;
pd.lStructSize = (DWORD) sizeof(PRINTDLG);
if( GetPrinterDeviceDefaults(&pd)) {
DEVMODE FAR* pDevMode = (DEVMODE FAR*)::GlobalLock(m_hDevMode);
if(pDevMode) {
switch (mode)
{
case 1:
pDevMode->dmOrientation = DMORIENT_LANDSCAPE;
break;
case 0:
default:
pDevMode->dmOrientation = DMORIENT_PORTRAIT;
break;
};
::GlobalUnlock(m_hDevMode);
}
}
}
hope this helps,
Sharad Ganesh
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Ok so I have setup a managed c++ class with a Constructor.
I noted that you can also create a Destructor "method" for the class by prefixing ~ onto the method name (which =s the class name.) e.g.
CPBrief()
{
}
~CPBrief()
{
}
Is that a good way to tidy things up when a class goes out of scope?
Also will the garbage collector (in C# or MC++) automatically call that Destructor? Or do I have to call it manually at a certain point?
Some of this is covered in MSDN, but I am not sure if it is "best practice" usage.
Thanks
regards,
Paul Watson
Bluegrass
Cape Town, South Africa
The greatest thing you'll ever learn is just to love, and to be loved in return - Moulin Rouge
Alison Pentland wrote:
I now have an image of you in front of the mirror in the morning, wearing your knickers, socks and shoes trying to decided if they match!
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The ~() is called when:
1. Object goes out of scope.
2. <if dinamically="" alloctade="" by="" 'new'="" operator=""> Using 'delete' operator.
3. Can be called manually.
* It's a good way for deallocating the object's resources inside the ~().
Hope this helps.
--BlackSmith--
"With the help of all mighty", 2001, Me.
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When we used to use the Win32 API and normal C++, you would clean up everything in the destructor that was allocated within the class, e.g. delete all the memory you'd used for an array or something:
class MyClass
{
public:
int *m_pMyArray;
MyClass() { printf("Hello!\n"); m_pMyArray = new int[200]; }
~MyClass() { printf("Bye!\n"); delete[] m_pMyArray; }
};You'd probably put error checking in there too of course. Anyway, if we used this class as follows:
int main()
{
MyClass mc;
printf("In the middle of main...\n");
}we would get this output:
Hello!
In the middle of main...
Bye! However, and don't quote me on this, I believe that you have to use the Finalize (don't you hate those American spellings?) method instead, and treat it as if it were a destructor. This is due to the garbage collection that takes place. The difference between the destructor in C++ and the Finalize method in MC++ is that Finalize could be called at an indeterminate time after the object goes out of scope.
Phew! Nish will probably be able to give you a better summary of the managed side of things than me.
--
Andrew.
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Andrew Peace wrote:
Phew! Nish will probably be able to give you a better summary of the managed side of things than me
LOL, no you did a great job Andrew, so thank you
Chris was telling me about that weird "when shall she blow?" behaviour fo Finalize. Seems awfully dodgy if you ask me hehe.
There is a lot of "slipping through the cracks" stuff in C++ that I have NEVER come across in other languages. VB and C# are water tight (unless you do really daft stuff) but C++ has wyrd waters flowing through it's veins.
Thanks Andrew, will give what you said a bash.
regards,
Paul Watson
Bluegrass
Cape Town, South Africa
The greatest thing you'll ever learn is just to love, and to be loved in return - Moulin Rouge
Alison Pentland wrote:
I now have an image of you in front of the mirror in the morning, wearing your knickers, socks and shoes trying to decided if they match!
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in my application ,all the controls are loaded by reading a file.and in that file i specify the control type,ID ,dimension and styles...In some editbox i want to restrict the user to enter only the numbers...i found many edit styles such as ES_CENTER,ES_LEFT,ES_MULTILINE etc..which one is for the the Editbox which accept only the numbers?? any idea???????
Renjith-CPian.
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ES_NUMBER
#define ES_NUMBER 0X2000L
CPUA 0x5041
Sonork 100.11743 Chicken Little
"So it can now be written in stone as a testament to humanities achievments "PJ did Pi at CP"." Colin Davies
Within you lies the power for good - Use it!
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Thanks Arends....
Renjith-CPian.
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