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Well, thanks for suggesting doing it in a simpler way.
My standard C++ code is now:
fstream file;
file.open("chars.dat", ios::out | ios::binary);
file.write(chars, count);
file.close();
and it works!
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Im trying to improve my STL skills at the moment and wondered of there is a nice way to do the following.
I have a map that maps a string to an integer. I use it to count the number of times I get specific message for an entity identified by the string. What I want to do is find the string with the highest count. Obviously I can do this by itterating through the map but I wondered if its possible to do it another way?
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Josh Gray wrote: but I wondered if its possible to do it another way?
Like keeping a reference to the one with the highest count.
led mike
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led mike wrote:
Like keeping a reference to the one with the highest count.
I was hoping for some nice use of the algorithm stuff, like a combination of for_each and ????
Im just playing around with some unit tests and a tad bored
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Josh Gray wrote: Im just playing around with some unit tests and a tad bored
Ah, ok, just don't give yourself any bad habbits like forgetting the KISS principle. (Keep It Simple Stupid)
led mike
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This falls outside of STL, but you could use Boost MultiIndex[^] with a hashed unique index for the messages and an ordered non-unique index for the counts.
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Hi,
you could use the following simple code
std::vector<std::string> vWords;
vWords.push_back("the");
vWords.push_back("eye");
vWords.push_back("of");
vWords.push_back("the");
vWords.push_back("tiger");
vWords.push_back("the");
vWords.push_back("eye");
vWords.push_back("of");
vWords.push_back("the");
vWords.push_back("beholder");
std::map<std::string,int> mapCheck;
int iMax = 0;
std::string strMaxWord;
for(std::vector<std::string>::const_iterator cIndex = vWords.begin(); cIndex != vWords.end(); Index++)
{
mapCheck[*cIndex]++;
if(mapCheck[*cIndex] > iMax)
{
iMax = mapCheck[*cIndex];
strMaxWord = *cIndex;
}
}
I hope that this helps or at least point you in the right direction
codito ergo sum
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Hi
I am trying to understand the function of m_pMainWnd. But i have a problem.
For example
BOOL CMyApp::InitInstance()<br />
{<br />
CMyWindow *MyWindow = new CMyWindow();
m_pMainWnd = MyWindow;
MyWindow->Create(NULL, L"window");<br />
MyWindow->ShowWindow(m_nCmdShow);<br />
MyWindow->UpdateWindow();<br />
return TRUE;<br />
};
1-) What is happening in m_pMainWnd = MyWindow assignment so window does not close immediately? Is this assignment call some functions in CwinThread class? Or something else?
2-) Also this is very interesting for me and i do not understand why it is so.
I assigned m_pMainWnd MyWindow object that derived from CFrameWnd class so m_pMainWnd holds CFrameWnd object but m_pMainWnd->Create(...) calls Cwnd::Create not CFrameWnd::Create ? Why is it so? How can it be?
Can you please help me to understand this assignment.
I am looking for your answers...
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After you have returned from the CMyApp::InitInstance(), the AfxWinMain() function calls the Run function of CWinApp. In that there is checking as shown below
int CWinApp::Run()<br />
{<br />
if (m_pMainWnd == NULL && AfxOleGetUserCtrl())<br />
{<br />
TRACE0("Warning: m_pMainWnd is NULL in CWinApp::Run - quitting application.\n");<br />
AfxPostQuitMessage(0);<br />
}<br />
....<br />
}
Now i think you undertand why your program didnt worked, when you comment that code.
nave
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Hmm ok Thank you very much.
So
MyWindow->ShowWindow(m_nCmdShow);
MyWindow->UpdateWindow();
lines are working but when the program exit scope it terminate the program.
Can you please tell me the .cpp file of this code?
Also Why does m_pMainWnd->Create(...) call Cwnd::Create not CFrameWnd::Create?
Thanks for answer.
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sawerr wrote: lines are working but when the program exit scope it terminate the program.
Yes
sawerr wrote: Can you please tell me the .cpp file of this code?
"Microsoft Visual Studio\VC98\MFC\SRC\THRDCORE.CPP "
m_pMainWnd is a pointer of class CWnd*. So it will call the function of CWnd is it. Also the CFrameWnd dont have a create function with the same signature as the create function of CWnd.
nave
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Will the assignment of m_pMainWnd not overide it being a pointer to CWnd and point to CFrameWnd. What is the explanation behind this?
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tom groezer wrote: Will the assignment of m_pMainWnd not overide it being a pointer to CWnd and point to CFrameWnd
No. From the point of view of the compiler, it only knows m_pMainWnd is a CWnd pointer.
Assigning it a pointer to a derived class object doesn't change its type. It does change
what virtual methods get called using the base class (CWnd) pointer though 
Mark
"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder
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tom groezer wrote: it being a pointer to CWnd and point to CFrameWnd.
Even though the m_pMainWnd points to a CFrameWnd object, the CFrameWnd dont have a Create function with the same signature of CWnd::Create(). So no scope for virtual function call also
nave
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I want to use CImage, which needs atlimage.h, but the problem is that I don't have this file on my computer (I use Visual Studio 6.0 on WinXP).
Do you know where can get the headers/libraries I need ?
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I think you need at least Visual Studio Standard edition.
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i am using visual studio 6.0
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Why you didnt use of GDI+ ? anyway on the codeproject has an article I think its good for you its name is CXImage.
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I agree with WhiteSky.
CImage uses GDI+ internally. You can use GDI+ directly. For CImage you'd need VS2003+ I believe.
Mark
"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder
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I write a program to dectect a new arrival USB-FLASH DISK [U-DISK]! if this arrival U-DISK satify my condition ,I do nothing and let it work defaultly; otherwise, I call a function to disable this arrival U-DISK.
my solution is :
1. write a function to disable specified U-DISK;
2. write a function to judge wheather the arriaval U-DISK is I wantted;
3. realize WM_DEVICECHANGE event and in this event to call my function;
the functions above may work correctly; but when I add WM_DEVICECHANGE event, these function work unuseful.I just want to know:Can I disable a specified U-DISK in WM_DEVICECHANGE?
there cannot upload sample codes.if someone may solve this problem or have interest with it ,please contact me and I will give you my sample codes.
thanks a lot .
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Hi.
I have created MDI derived from CFormview. When I File -> Open, a child window with this (first) view will open. This part is done. From there, user clicked on the modified menu say, View -> Graph. Then another child window will open with a different (second) view. This second view needs to be in CFormview as I will have control in it.
Any suggestion on how to implement this idea?
Thanks.
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Do you want to make a CFormView ?
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You can insert CFormview to your project after insert you have a dialog with it.Does it your answer or no?
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