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Is INT_PTR available in VC++ 2010? Is it safe to use instead of int in places like getting return value from CDialog::DoModal() etc?
--
"Programming is an art that fights back!"
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Yes, the INT_PTR is available in VC++ 2010, and not only it's safe to use it as return value from calls like CDialog::DoModal() but it is strongly recommended! That type is defined as typedef int __w64 INT_PTR; this means that it is just an int: the __w64 keyword is an hint that the compiler uses to find 64-bit portability issues and warn about it.
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Yes it is! answer to second question is also Yeap
"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
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I have a dialog.
I am displaying a messagebox with MB_APPMODAL. It comes over the dialog box (fine till now)
I am having one thread in background which updates dialog and make it top most but if message box is visible then I want messagebox to remain at top. So how to focus on that message box again. 
I am using AfxMessageBox to diaplay message.
Well a rough example will like. There are 2 buttons on dialog, 2 messageboxes are already shown. If I click on first button then it will put messagebox1 in foreground , if I click on button 2 then it will put messagebox2 in foreground. I don't want to re-create message box.
I am using AfxMessageBox to diaplay message.
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Your thread could post a user-message at the dialog
and not place the dialog at the top directly... 
The dialog message handler function could
1) place the dialog at the top
2) enumerate its children and place all them at the top,
whose class name = _T("#32770"),
in the enumerating callback function
virtual void BeHappy() = 0;
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Right I was also thinking the same. But my application shows 3 or 4 dialogs so thread might be updating dialog 1 or dialog 2 so I have to put code to handle that message in every dialog which may be at top. Instead of this I wish I could have a handle of that messagebox. If window can have a handle then messagebox should also provide a way to get the handle. Anyways, I am implementing "user-message" solution.
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some tricky ways :- store the caption of your AfxMessageBox() before calling the function. From your other threads, whenever you need to bring message box foreground, call FindWindow('caption'), have message box's handle.. do whatever you want with it.
Try GetLastActivePopup() also, though i haven't used it.
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Couldn't you just use MB_SYSMODAL instead of MB_APPMODAL? Otherwise add MB_TOPMOST?
Good luck!
PURPOSE: Delays program execution until designated condition is indicated.
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Hi,
I want to capture a exception. I used try catch but its not working.Im using the following code. Please suggest me.
LPSTR szError;
try
{
int i = 10;
int j = 0;
int k = i/j;
}
catch(CException *e)
{
e->GetErrorMessage(szError,200,NULL);
}
Thanks,
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The CException *e has somebody to throw. And this wont do the "/" operator.
Use catch(...) what returns GetLastError()
Press F1 for help or google it.
Greetings from Germany
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its not going to the catch block,after executing the i/j statment,the application is getting crashed.
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I do not think that divide by zero is a catchable exception; try throwing something within your code. Also take a look at this page[^].
It's time for a new signature.
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Make at least sure you don't have any optimizing turned on. It might remove your entire code block. Step through the code in the disassembly window, instruction by instruction, and inspect what happens and make sure all the code you expect is there.
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That'll work if you're using managed code as that exception comes from the .NET runtime. However as you originally said you want to catch a CException then you're using MFC which (AFAIK, I may be misinformed) doesn't play nicely with .NET and managed code.
Cheers,
Ash
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Karthika85 wrote: we can catch divide by zero error. please chk this link
I did; did you check the note that states: Note You must add the common language runtime support compiler option (/clr:oldSyntax) in Visual C++ 2005 to successfully compile the previous code sample.
This example is for C++.NET and will only work in managed code, you are trying to use CException[^] which is only for MFC exceptions.
It's time for a new signature.
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you also could write such methords or classes which handles such cases and than throws exception.
Press F1 for help or google it.
Greetings from Germany
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There isn't a C++ exception for what you want to catch. You have to use an operating specific method to trap that sort of error. You can convert the operating system error into a C++ exception if the mechanism allows it but it won't happen by default.
As an example you can use structured exception handling (SEH) (the OS specific thing that happens on a divide by zero) on windows to throw a C++ exception.
Cheers,
Ash
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As Ash said, the division by zero is not a C++ exception, so you should use platform specific API to deal with it and translate it to a C++ exception.
Read this from the MSDN: _set_se_translator (CRT)[^] (it requires to compile with the right flags to make it work properly).
Another way to achieve your goal is to use the __try/__except statements (see try-except Statement (C++)[^]).
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No exceptions will be thrown in your code.I would recommend your are targeting VC10 and you don't need the best performance possible consider using SafeInt class.It automatically checks for overflows and attempts to divide by zero.
#include <safeint.h>
...
using namespace msl::utilities;
try{
SafeInt<int> i = 10;
SafeInt<int> j = 0;
SafeInt<int> k = i/j;
}
catch(SafeIntException& e)
{
switch(e.m_code)
{
case SafeIntDivideByZero:
AfxMessageBox(L"Devide by zero occured!");
break;
case SafeIntArithmeticOverflow:
AfxMessageBox(L"Overflow error occured!");
break;
case SafeIntNoError:
AfxMessageBox(L"Other error occured!");
break;
}
}
Life is a stage and we are all actors!
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Hi all,
i am reading a file with help of CStdioFile using while loop and read the file till file reached end of file,in the file somewhere symbol exist,when reading this line with ReadString ,while loop becomes infinite loop and not return and application goes in notresponding state.
please tell me how can i read the full file with this symbol or how can i remove this symbol from file before reading the file.
thanks in advance.
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Please post some relevant code.
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CStdioFile file;
CString str="";
file.Open(file_name,CFile::modeRead,0);
while(file.end)
{
file.ReadString(str);
}
file.Close();
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Le@rner wrote: while(file.end)
I don't know where the "end" is coming from (I never used CStdioFile in fact), but if you check the documentation of ReadString[^], you can see that the function returns FALSE when the end of file was reached. You should try to use that.
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if i do this ,function not read the full file and return when this symbol occur becoz here ReadFile return 0,but i want to read full file data.
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