C / C++ / MFC

Re: in win32api if i want to move between the fields with tab button ? is it possible ?

15-Jan-12 5:44

tanks

i try to use WS_TABSTOP , not effect anything

modified 15-Jan-12 12:13pm.

Not enough information

Code-o-mat16-Jan-12 0:21

Code-o-mat

16-Jan-12 0:21

Please try providing a bit more information about your problem, otherwise none will be able to help you.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<

Stephen Hewitt16-Jan-12 2:23

Stephen Hewitt

16-Jan-12 2:23

It will happen automatically for controls on a modal dialog box that have the WS_TABSTOP style. For other windows use the IsDialogMessage[^] function.

Steve

Re: in win32api if i want to move between the fields with tab button ? is it possible ?

a1_shay16-Jan-12 11:44

in win32api how i create and use with dll file ?

16-Jan-12 11:44

thanks ,its working

a1_shay15-Jan-12 5:26

Re: in win32api how i create and use with dll file ?

15-Jan-12 5:26

tanks

Richard MacCutchan15-Jan-12 5:43

how to read only integers from a file with c

15-Jan-12 5:43

Please give more detail of your problem, this question is not clear.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

reemamjd15-Jan-12 3:01

reemamjd

15-Jan-12 3:01

Im trying to read a file, containing Strings n integers..
please help me to only to read the integers and find the total marks
file contain 10 students names and marks ,each in a line and students name and marks separated by a comma .

eg:
John,89
Katharin,78

F.R.Majeed

venomation15-Jan-12 3:25

venomation

15-Jan-12 3:25

This sounds like a course assignment... Suspicious | :suss:

Think about it logically:
x - Find a way to read the file line by line
x - What could you do when you obtain a line?
x - Is there a way to split the line apart, maybe separate name and mark?
x - When you find a way to separate them, it is simply the case of casting the string to an int and visa versa.

If you get really stuck here is a nice link of tools you could use to help with the string:
http://www.cplusplus.com/reference/string/string/[^]

Richard MacCutchan15-Jan-12 3:34

15-Jan-12 3:34

venomation wrote:
it is simply the case of casting the string to an int and visa versa.

You cannot cast a string to an int, it must be converted.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

reemamjd15-Jan-12 4:11

reemamjd

15-Jan-12 4:11

@ venomation Confused | :confused:

what u mention above could be done through oop language but i want to know how to do it through C (sop)

Richard MacCutchan15-Jan-12 4:58

15-Jan-12 4:58

Doing this with C language programming is not difficult; just a few statements.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

David Crow15-Jan-12 16:24

David Crow

15-Jan-12 16:24

Have you considered fscanf()?

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

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reemamjd15-Jan-12 18:45

reemamjd

15-Jan-12 18:45

fp=fopen("SDetails.txt","r+");
while(1)
  {
     ch=fgetc(fp);
      if(ch==EOF)
        break;
        fscanf(fp, "%d", &myInt);
        printf(" %d ",myInt);
        sum=sum+myInt;
  }

printf("%d",sum);
  fclose(fp);

what i did was like above ..but it print the same int 3 times ..i cant find the error...please help

now i can read only ints from the file..thx

in win32api how can i make button shaded ?

David Crow16-Jan-12 3:13

David Crow

16-Jan-12 3:13

What you have will never work as you expect. The call to fgetc() is going to advance the file pointer, then fscanf() is going to be reading from the middle of some byte. Have you checked the return value from fscanf()? If it does not find a number to read from the file, it may be retaining the last read value.

Is your file laid out something like:

Name1,288,7099,441
Name2,1500
Name3,587,208

a1_shay14-Jan-12 11:51

Re: in win32api how can i make button shaded ?

14-Jan-12 11:51

and not when i create the window .

thanks

i found what i need is call WS_DISABLED
but how i set this parameter on a button.again not when i create this window but after

nevermind i just create the window again when i get in the function with disable and when i finish i create again the window without disable

modified 14-Jan-12 18:31pm.

«_Superman_»14-Jan-12 15:58

«_Superman_»

14-Jan-12 15:58

To disable a button (or any window or control) after it has been created, use the EnableWindow(hButton, FALSE); API call.
To get the handle to the button, use the GetDlgItem API.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

function pointers

shiftwik14-Jan-12 10:08

shiftwik

14-Jan-12 10:08

I can't seem to get the function pointers working?

anybody see what's wrong? I just want to call the print()method

#include "stdio.h"
class TMyClass
{
public:
        void print(){ printf("Print!\n"); };
       void (TMyClass::*pt2Member)();
       TMyClass(void);
 };
TMyClass::TMyClass(void)
{
     pt2Member = &TMyClass::print;
};
int main(int argc, char* argv[])
{
    TMyClass instance1;
     instance1.pt2Member;
    return 0;
}

Re: function pointers

«_Superman_»14-Jan-12 16:23

«_Superman_»

14-Jan-12 16:23

To call a member function using pointers you have to use the pointer to member operators (.* or ->* or ::*).
But declaring the function pointer inside the class is not very helpful.

Usually the function pointer is declared outside the class like this -

void (TMyClass::*pt2Member)() = &TMyClass::print;

The above declaration may be done globally or inside the main function.
In this case, the function call would be as follows -

TMyClass instance1;
(instance1.*pt2Member)();

If, however, you do wish to declare the pointer inside the class like you've done here, the calling syntax would be a little weird and would look like this -

TMyClass instance1;
(instance1.*instance1.pt2Member)();

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: function pointers

shiftwik14-Jan-12 18:42

shiftwik

14-Jan-12 18:42

you earned your title 'superman'

thank you!!! works like a charm

Drawing

columbos1492714-Jan-12 8:46

columbos14927

14-Jan-12 8:46

Hello,

What i have is a video stream coming in, for every incoming frame i have to calculate the frame histogram and to display it graphically in the GUI.
So i have to redraw the histogram on the GUI every frame.

My problem is that i don't know how to draw the histogram,what controls to use,what functions or classes can help me?

Thanks.

Re: Drawing

«_Superman_»14-Jan-12 16:13

«_Superman_»

14-Jan-12 16:13

Here is an article with a histogram control - A simple histogram displaying control[^]
It is written in C#, but you could get some help from this to create your own controls in C++.

Here is another article in C++ - http://www.codeguru.com/article.php/c2303[^]

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Form view is showing it's background on the screen.

Amrit Agr13-Jan-12 23:33

Amrit Agr

13-Jan-12 23:33

Hi Developers,

I am using a MDI based application. I am trying to open a view and it's showing the background image on it. It's like overlaps it's own screen and background screen. I have not used any drawing function at all.

Can any one help me.

Thanks in Advance.
Amrit Agrawal
Software Developer, Mumbai

Re: Form view is showing it's background on the screen.

Richard MacCutchan14-Jan-12 3:27

problem with api messagebox

14-Jan-12 3:27

Amrit Agr wrote:
it's showing the background image on it. It's like overlaps it's own screen and background screen.

I am having difficulty visualising exactly what you are seeing. Rather than 'it' can you explain which part of each window is showing what values. What do you see in the Main window, what do you see in the View, and where is the background from?

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

a1_shay13-Jan-12 21:47