C / C++ / MFC

Re: fgets??

hauptman20-Mar-05 11:21

hauptman

20-Mar-05 11:21

char buffer[HOPEFULLY_BIG_ENOUGH];
int i = 0;
while( !feof(filep))
{
buffer[i] = fgetc(filep);
++i;
}

Re: fgets??

David Crow21-Mar-05 4:21

David Crow

21-Mar-05 4:21

Are you kidding? This is the epitome of inefficient. For very small files it would probably suffice, but for files of measureable size, reading from a file one character at a time is a bad design.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: fgets??

Christian Graus20-Mar-05 11:58

Christian Graus

20-Mar-05 11:58

Unless you're not using C++, use iostreams instead of C file handling. I have an article on this site about how to do this in C++, I believe.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

Re: fgets??

Aamir Butt21-Mar-05 0:18

Aamir Butt

21-Mar-05 0:18

And if you are using MFC, try CStdIOFile. Smile | :)

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How do I call a Child window from a Dialog?

TMaxwell8620-Mar-05 10:21

TMaxwell86

20-Mar-05 10:21

Hello,
This may seem rather easy for most of you, but I seem to have difficulty with what should be a very easy task.
I have a Main Frame that opens with a background bmp but no Child. What I want to do is when you click "Start" from the menu, a dialog opens. After filling out a few variables in the dialog, I want to close the dialog, then open two new/different child windows (actually I would like to split the main window into 4 parts and place adifferent child into each quarter).
Can anyone direct me to an online file or tutorial for something like this? I can't seem to find the right reference.
Any help would be GREATLY appreciated! Big Grin | :-D

Thomas (tntnmmd@hotmail.com)

Re: How do I call a Child window from a Dialog?

Renjith Ramachandran20-Mar-05 15:57

Renjith Ramachandran

20-Mar-05 15:57

From the Start Menu ?

Override WM_COMMAND
OnCommand()
{
check ur menu ID, if it from start menu,
CChildDlg oDlg;
oDlg.DoModal();

}

4 Frames???? Sounds like u really need a splitter wnd...
hey refer MSDN , there is no other better source for MFC/SDK..

Ninety-eight percent of the thrill comes from knowing that the thing you designed works, and works almost the way you expected it would. If that happens, part of you is in that machine.

Accessing the gui controls of other applications

modshah_one20-Mar-05 7:08

modshah_one

20-Mar-05 7:08

hi,

I would like to know if there is a way by which an application can hook into other applications and access their gui controls (like buttons, textboxes....).

I have done some research on this. I found out that a dll (with SetWindowsHookEx) can be used to hook into the message queue of an application so as to receive all the notifications that are sent to the application. Another method is WH_CBT and CBTProc. But I'm still not clear as to how this can be used to access the internal controls of a windows application.

Thanking you.

Re: Accessing the gui controls of other applications

David Crow21-Mar-05 4:26

David Crow

21-Mar-05 4:26

One way would be to send the other application the appropriate message. To "click" a button, try:

SendMessage(hwnd_of_other_app, WM_COMMAND, MAKEWPARAM(button_id, BN_CLICKED), hwnd_of_button);

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Accessing the gui controls of other applications

modshah_one21-Mar-05 7:12

modshah_one

21-Mar-05 7:12

Thank you for replying. SendMessage could help in simulating button clicks. But my problem is how will i know about the button_id ?

The basic assumption is that my application will not know anything about the internal structure of the target application (except for the fact that it is a windows exe). In that case how can i query the control ids ? Is there some generic way that will help to query the ids of the controls ?

Or should i resort to extracting info from the exe file itself ?

Any help will be appreciated.

Re: Accessing the gui controls of other applications

David Crow21-Mar-05 7:21

David Crow

21-Mar-05 7:21

Use FindWindowEx() and/or EnumChildWindows() to find the window/control in question. From there you can use GetDlgCtrlID() to get the identifier of the control.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

PLBYTE to int *

samhwang20-Mar-05 6:41

samhwang

20-Mar-05 6:41

How to convert a PLBYTE to integer array?

Thx!

Re: PLBYTE to int *

John R. Shaw20-Mar-05 11:10

John R. Shaw

20-Mar-05 11:10

// in C
int* makeIntArrayFromByteArrary(LPBYTE *pByte,size_t cbByte)
{
    int* pInt = (int*)malloc(cbByte * sizeof(int));
    if( pInt ) {
        int i;
        for( i=0; i<cbByte; ++i )
            pInt[i] = pByte[i];
    }
    return pInt;
}
// in C++
int* makeIntArrayFromByteArrary(LPBYTE *pByte,size_t cbByte)
{
    int* pInt = new int[cbByte];
    if( pInt ) { // incase new does not throw
        for( int i=0; i<cbByte; ++i )
            pInt[i] = int(pByte[i]);
    }
    return pInt;
}

Do not forget, you are responsible for freeing memory after you are finished using the allocated arrary of intergers.

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

Re: PLBYTE to int *

samhwang20-Mar-05 14:45

samhwang

20-Mar-05 14:45

Maybe it is really a newbie problem, but how to obtain the size of *pByte? just use sizeof operator?

Re: PLBYTE to int *

David Crow21-Mar-05 4:28

David Crow

21-Mar-05 4:28

samhwang wrote:
...how to obtain the size of *pByte? just use sizeof operator?

Pointers have a constant size of 4 bytes. Perhaps you are wanting to know how many bytes the pointer is pointing to.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: PLBYTE to int *

John R. Shaw30-Mar-05 6:00

John R. Shaw

30-Mar-05 6:00

Sorry, I've been away!

1) "PLBYTE" is not a defined type it should be "LPBYTE" or "BYTE*".
2) I made a mistake: "LPBYTE *pByte" should be "LPBYTE pByte" or "BYTE* pByte".

sizeof examples:
BYTE b;
int i;
BYTE ba[10];
int ia[10];
BYTE* pba = ba;
int* pia = ia;
//sizeof(b) = sizeof(BYTE) = 1
//sizeof(i) = sizeof(int) = 4 (on 32-bit compilers)
//sizeof(ba) = 10*sizeof(ba[0] = 10*sizeof(BYTE) = 10
//sizeof(ia) = 10*sizeof(ia[0] = 10*sizeof(int) = 10*4 (on 32-bit compilers)
//sizeof(pba) = sizeof(BYTE*) = 4 (on 32-bit compilers)
//sizeof(pia) = sizeof(BYTE*) = 4 (on 32-bit compilers)

Notes:
1) sizeof(int) is the size of a machine word.
2) A machine word is the maximum number of bytes that can fit into one machine register.
3) Reality: What the size of an int is depends on the compiler you are using;
16-bit -> sizeof(int) = 2,
32-bit -> sizeof(int) = 4,
64-bit -> sizeof(int) = 8.

Well, I hope that answers all your questions.

Good Luck!

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

amstream.h

Verolix20-Mar-05 6:15

Verolix

20-Mar-05 6:15

Can someone upload amstream.h somewhere? Visual Studio 2005 doesn't have it...

Re: amstream.h

Christian Graus20-Mar-05 12:01

Christian Graus

20-Mar-05 12:01

*sigh* What do you expect to do with a single header file ?

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

simple program

mpapeo20-Mar-05 4:05

mpapeo

20-Mar-05 4:05

Why does this program crush?, what have i left?

<br />
#include "stdio.h"<br />
<br />
<br />
int main(int argc, char* argv[])<br />
{	<br />
	FILE* fp;<br />
	char fname[10];<br />
	<br />
	printf("Enter the file name: ",fname);<br />
	scanf ("%s",fname);<br />
	 <br />
	if( fp )<br />
		fopen("&fname","wt");<br />
	{		<br />
		int i;<br />
		for( i=0; i<10; ++i )			<br />
			fprintf(fp,"Line %d\n",i);		<br />
		<br />
		fclose(fp);	<br />
	}	<br />
	return 0;<br />
}

oam

Re: simple program

C^hris L^osinger20-Mar-05 4:26

C^hris L^osinger

20-Mar-05 4:26

you never assigned a value to fp.

fp = fopen(...);

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Re: simple program

eli1502197920-Mar-05 4:30

eli15021979

20-Mar-05 4:30

mpapeo wrote:
if( fp )
fopen("&fname","wt");
{
int i;
for( i=0; i<10; ++i )
fprintf(fp,"Line %d\n",i);

fclose(fp);
}

it's should be :

fopen(&fname,"wt"); //&fname without quotation marks
if( fp )
{ 
   int i;
   for( i=0; i<10; ++i ) 
       fprintf(fp,"Line %d\n",i); 
   fclose(fp); 
}

Re: simple program

Ravi Bhavnani20-Mar-05 5:39

Ravi Bhavnani

20-Mar-05 5:39

Actually, fp = fopen (...);, but you probably meant that.

/ravi

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Re: simple program

eli1502197920-Mar-05 20:26

eli15021979

20-Mar-05 20:26

right

Re: simple program

mpapeo20-Mar-05 10:59

mpapeo

20-Mar-05 10:59

Still it crushes

oam

because i have made the changes you suggested.

<br />
#include "stdio.h"<br />
<br />
<br />
int main(int argc, char* argv[])<br />
{	<br />
	FILE* fp;<br />
	char fname[30];<br />
	<br />
	printf("Enter the file name: ",fname);<br />
	scanf ("%s",fname);<br />
	 <br />
	<br />
		fopen(&fname,"wt");<br />
		if( fp )<br />
	{		<br />
		int i;<br />
		for( i=0; i<10; ++i )			<br />
			fprintf(fp,"Line %d\n",i);		<br />
		<br />
		fclose(fp);	<br />
	}	<br />
	return 0;<br />
}<br />