C / C++ / MFC

Re: replace malloc by new

2-Oct-14 2:32

I have following code

C++

int nSize = 100;
unsigned char* pBuffer;
//	pBuffer = (unsigned char*)malloc(nSize);
// replaced by
	pBuffer = new unsigned char(nSize);

and I tried to clean it by

C++

//	free(pBuffer);
// replaced by
	delete[] pBuffer;

but seems not working ... I have done wrong ?

modified 2-Oct-14 8:50am.

_Flaviu2-Oct-14 3:02

how to utilize "(int argc, const char * argv[]) " in a program

2-Oct-14 3:02

I know what: I replaced "(" by "[" in

C++

pBuffer = new unsigned char(nSize);

C++

pBuffer = new unsigned char[nSize];

Stefan611-Oct-14 13:25

Stefan61

1-Oct-14 13:25

I found the following program that count the number of words within a phrase but I don't understand the
initial code defined on the int main :
" int argc,const char * argv[]

just want learn. thanks
--------------------------------------

#include <iostream>

using namespace std;

int main(int argc, const char * argv[])
{
// ask the user to enter a string
cout << "Enter a string: ";
// save the string entered by the user
string input;
getline(cin, input);

int numberOfWords = 0;
// loop through the input and count all the spaces
int inputLen = (int)input.length();
for (int i=0; i<inputLen; i++) {
char current = input.at(i);
if (isspace(current)) {
numberOfWords++;
}
}

// in case there were words, and not empty string, remember that there's always
// one space less than the actual number of words
if (numberOfWords > 0) {
numberOfWords++;
}

// print the number of words
cout << "\nNumber of words = " << numberOfWords << endl;;

return 0;
}

Re: how to utilize "(int argc, const char * argv[]) " in a program

enhzflep1-Oct-14 19:59

enhzflep

1-Oct-14 19:59

argc = arg count
*argv[] = an array of argc number of strings.

Consider the following program:

C++

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
    int i;
    for(i=0; i<argc; i++)
        printf("Argument index %d: %s\n", i, argv[i]);

    return 0;
}

When I call the program from the command line like so:

argcdemo arg1 arg2 -someFlag -somethingElse

I get the following output:

Argument index 0: argcdemo
Argument index 1: arg1
Argument index 2: arg2
Argument index 3: -someFlag
Argument index 4: -somethingElse

So as you can see, the first one takes the name of the program as invoked, the others get a string from the command line, where each string is separated by a space. Or more simply, the argc will always be at least 1,since you have to specify the name of the program to run. Any subsequent arguments will increment argc and have their values added to the argv array. Smile | :)

"When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life." - John Lennon

Re: how to utilize "(int argc, const char * argv[]) " in a program

CPallini1-Oct-14 22:03

CPallini

1-Oct-14 22:03

Google is your friend. See for instance: "argc and argv"[^].

THESE PEOPLE REALLY BOTHER ME!! How can they know what you should do without knowing what you want done?!?!
-- C++ FQA Lite

Is it possible to bind the "this" pointer

elelont230-Sep-14 20:30

elelont2

30-Sep-14 20:30

Hi,
Is it possible to bind the "this" pointer to make a callback into a non-static class member function (c++98, no boost).

I don't think the "this" pointer is passed directly as a parameter to the function?

C++

typedef void (*CallBackType)(void);

...

C++

obj->SetCallback(std::bind1st(&MyClass::CallBackFunc, this));

Re: Is it possible to bind the "this" pointer

CPallini30-Sep-14 21:48

CPallini

30-Sep-14 21:48

No, it is not possible (at least as far as I know). From bind1st at C++ Reference:

Return function object with first parameter bound
This function constructs an unary function object from the binary function object op by binding its first parameter to the fixed value x.

A method taking one argument is not exactly a binary function.

THESE PEOPLE REALLY BOTHER ME!! How can they know what you should do without knowing what you want done?!?!
-- C++ FQA Lite

Re: Is it possible to bind the "this" pointer

CubbiMew1-Oct-14 16:42

CubbiMew

1-Oct-14 16:42

You could use bind1st if CallBackFunc took one parameter:

C++

void CallBackFunc(int) { ... }
...
obj->SetCallback(std::bind1st(std::mem_fun(&MyClass::CallBackFunc), this));

Since it takes nothing, you may have to write your own function template that takes a callable and a pointer that returns a small function object that stores the callable and the pointer as members and invokes them with operator(): as always, by refusing to use boost you're forcing yourself to reimplement parts of it.

Only Desktop capturing without some active windows or capture only Desktop i.e Desktop Background and Icons

narmadha_s30-Sep-14 2:53

narmadha_s

30-Sep-14 2:53

I need to capture Desktop and Filter with some active windows

Or

I need to capture only Desktop i.e Desktop Background and Icons if some other active windows are maximized.

Please help me to do this. In my project this is main concept. Thanks to spend your valuable times for this.

Thanks & Regards
Narmadha

Re: Only Desktop capturing without some active windows or capture only Desktop i.e Desktop Background and Icons

Richard MacCutchan30-Sep-14 6:04

Re: Only Desktop capturing without some active windows or capture only Desktop i.e Desktop Background and Icons

30-Sep-14 6:04

narmadha_s wrote:
I need to capture Desktop and Filter with some active windows

You need to explain better what you mean by this. What exactly are you trying to capture, and what do you want to do with it?

narmadha_s6-Oct-14 19:33

narmadha_s

6-Oct-14 19:33

I want to capture total desktop. In that i have to filter my application window only. i.e Have to capture entire desktop with some restrictions. This is for like call center application.

Without my application window, i have to capture entire desktop. But my application will be visible and active window on desktop. Please kindle help me... Thanks to spend your valuable time for this.....

Regards,
Narmadha

Re: Only Desktop capturing without some active windows or capture only Desktop i.e Desktop Background and Icons

Richard MacCutchan6-Oct-14 21:13

Re: Only Desktop capturing without some active windows or capture only Desktop i.e Desktop Background and Icons

6-Oct-14 21:13

See Various methods for capturing the screen[^].

David Crow30-Sep-14 9:25

David Crow

30-Sep-14 9:25

If you already know how to initiate a "print screen" command to capture windows, then you could precede that with something like the following to minimize all windows first:

CoInitialize(NULL);
IShellDispatch4 *pShellDisp = NULL;   
HRESULT sc = CoCreateInstance(CLSID_Shell, NULL, CLSCTX_SERVER, IID_IDispatch, (LPVOID *) &pShellDisp);
sc = pShellDisp->ToggleDesktop();
// do screen capture here
sc = pShellDisp->ToggleDesktop();
pShellDisp->Release();

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

Re: Only Desktop capturing without some active windows or capture only Desktop i.e Desktop Background and Icons

narmadha_s6-Oct-14 19:42

narmadha_s

6-Oct-14 19:42

Thank you for the reply...

But i have to capture without minimize the windows. Actually, My requirement is,

I have to capture Entire desktop without my application window. My application will be visible and active window on desktop. Please do you have any idea on this help me...

Regards,
Narmadha

Re: Only Desktop capturing without some active windows or capture only Desktop i.e Desktop Background and Icons

David Crow7-Oct-14 2:24

David Crow

7-Oct-14 2:24

narmadha_s wrote:

I have to capture Entire desktop without my application window.

So then minimize just your app and then capture the desktop.

Re: Only Desktop capturing without some active windows or capture only Desktop i.e Desktop Background and Icons

Software_Developer6-Oct-14 23:37

Software_Developer

6-Oct-14 23:37

First. Minimize All running apps. Run the code below.

C++

#include <iostream>
#include <windows.h>
using namespace std;



int main()
{
    keybd_event(VK_MENU, 0, 0, 0); //Alt Press
    keybd_event(VK_SNAPSHOT, 0, 0, 0); //PrntScrn Press


    keybd_event(VK_SNAPSHOT, 0, KEYEVENTF_KEYUP, 0); //PrntScrn Release
    keybd_event(VK_MENU, 0, KEYEVENTF_KEYUP, 0); //Alt Release

return 0;
}

Change LVS_ALIGNLEFT by LVS_ALIGNTOP

_Flaviu30-Sep-14 0:01

30-Sep-14 0:01

How can I change LVS_ALIGNLEFT by LVS_ALIGNTOP (of an CListCtrl) at runtime ? The list has LVS_ICON style already ...
Thank you.

Richard MacCutchan30-Sep-14 0:21

See http://msdn.microsoft.com/en-us/library/windows/desktop/bb774735(v=vs.85).aspx#ListView_Styles_and_Views[^].

30-Sep-14 0:21

Freak3030-Sep-14 0:23

Freak30

30-Sep-14 0:23

What you are looking for is the funtion CWnd::ModifyStyle.

The good thing about pessimism is, that you are always either right or pleasently surprised.

_Flaviu30-Sep-14 0:35

30-Sep-14 0:35

I tried both solutions:

C++

ListView_SetExtendedListViewStyleEx(m_List.GetSafeHwnd(), LVS_ALIGNMASK, LVS_ALIGNLEFT);

and

C++

m_List.ModifyStyle(LVS_ALIGNTOP, LVS_ALIGNLEFT);

none of them are working ... I am not figure out why ...

Richard MacCutchan30-Sep-14 0:45

30-Sep-14 0:45

You need to use

C++

DWORD dwStyle = GetWindowLong(m_hWnd, GWL_STYLE);
// modify the style mask as required
SetWindowLong(m_hWnd, GWL_STYLE, dwStyle);

There are probably some MFC shortcuts to this.

_Flaviu30-Sep-14 1:43