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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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Sorry, your sentence is not clear at all  .
There's no ReadFile function, I guess you are talking about ReadString ? Furthermore, the function doesn't read the complete file but only one line, so it is normal that the function return before the end of the file. You have to call it repeatedly until the function returns FALSE.
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There are several issues with what is going on here..
After looking the code its important to note the file.end is not doing what you want it to do. If you look at the definition of the data member it is returning an enumeration to the end of the file. It is not whether or not you are currently at the EOF.
Also the methods you are using STOP on a EOF character because you are reading in the default text mode.
You should be opening the file in binary read mode " CFile::typeBinary".
Because of the special characters I would suggest that you tseek the end of file get the length of the file and then do a for loop to retrieve the data out of the file.
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Dear SnowHow,
i have observe same result.
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Hi All,i want to capture mouse move over a CButton(Button Controls) in a dialog.Whenever i move mouse over a button i want to change the button properties eg : button color, button picture(Bitmap). Please any one have any idias or any examples, which helps me.
Thanks in Advance
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hapyy coding with
TRACKMOUSEEVENT tme;//class member !!!
tme.cbSize = sizeof(tme);
tme.dwFlags = TME_LEAVE|TME_HOVER;
tme.dwHoverTime = 1;
_TrackMouseEvent(&tme);//
and
ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave)
ON_MESSAGE( WM_MOUSEHOVER, OnMouseHover )
Press F1 for help or google it.
Greetings from Germany
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I am working on a very large project and would like to know if their is a rule of thumb for the proper sequence for doing #includes.
I have always put my #include's in headers and done no #includes in any of my .cpp files. When my projects get large and I use a lot of the same included files I put a master header and include it in every other header.
For example:
Utils.h
#include <io.h>
#include <pgmspace.h>
#include <delay.h>
-Other helper functions that are
useful such as a custom printf()
Display.h
#include "Utils.h"
#include "ctime.h"
Display.cpp
#include Display.h
The reason I am asking is my target is VERY memory limited and I need to get things as small as possible so useless inclusions that and bulk I need to get rid of. My other method of doing things is to only include exactly what that .h/.cpp set requires and use a Globals.h with external decelerations for all cross file variables and definitions.
I still do not understand how the linker pieces objects together when their are unused functions. I would imagine that the compiler runs through your code and only generates asm for the functions and variables you use. If their is a function that uses a 10x32bit array but your not using it the compiler skips it? Then in the linker stage if it notices their are duplicate functions in each of the objects it strips out the others and only includes one? If this is the case then my above question is just semantics and I should not worry and do what is easiest to maintain and cleanest.
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One way to make sure you include only required headers. is by using #define macros.
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I already use the #ifndef/#define inclusion guards. If you have a function in a say 'abs.h/abs.cpp' and include it in 'part1.cpp' and 'part2.cpp' and use it in each part upon compiling 'part1.o' and 'part2.o' will each have that function. When the linker combines 'part1.o & part2.o into final.exe' will the function still be included twice or does it weed out duplicates and just point them all to one?
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