C / C++ / MFC

Re: How To Look At GCC C Sources

24-Apr-16 5:44

Frederick J. Harris wrote:
searching for pow

... probably in a file named math.c, or similar.

Jochen Arndt24-Apr-16 21:32

Jochen Arndt

24-Apr-16 21:32

What you are looking for are the glibc sources (the C standard library) and not the GCC sources (the GNU compiler collection). Glibc download: The GNU C Library[^]; download without using Git: Index of /gnu/glibc[^].

The pow() and exp() functions are part of the math library which depends on the target platform processor. Once you have unpacked the glibc sources, these functions can be found here for x86 CPUs (file names for double):

sysdeps/i386/fpu/e_pow.S: Implementation using the x87 math coprocessor.
sysdeps/ieee754/dbl-64/e_pow.c: Implementation in plain C.

The FPU implementation is in assembler and should not need any other functions. The IEEE implementation needs other modules (at least e_exp.c) and some header files.

Re: How To Look At GCC C Sources

Frederick J. Harris24-Apr-16 23:57

Frederick J. Harris

24-Apr-16 23:57

Thanks very much Richard and Jochen. It dawned on me yesterday afternoon while taking a walk (which is how I solve most of my programming problems) that I needed libc - not GNU GCC sources. Just now before checking in here I managed to download libc in tarball format. Now I need to see if I have an app to extract tarballs. I much appreciate your help! Thanks very much!

Exchanging data using CSocket

manoharbalu22-Apr-16 22:30

manoharbalu

22-Apr-16 22:30

We have a Server and Client application developed in MFC
The Server and the client exchange data using CSocket class

We have a big Structure of size 900000 bytes to exchange data.
Our Structure contains array of integer, char and float as data members. Our structure looks like the below eg.
struct ModData
{
float LH [600];
float XS [30][600];
float NER [600];
float TDER [600];
float DER [30][600];
float SS [1500];
float SS2 [1500];
float COMP [30][1500];
char POIC [900];
int AMID [100];
char AMS [100];
char WTL [2500];
char FRN;
char XGO;
};

I am copying all the structure data to char variable and send and receive data between clients through serialization. We have a global object for the above structure whose values changes continuously based on some calculations every 250 millisec. So some of the data changes continously every 250 millisec.

Example calculations that change data:
Test->ss = Test->ss + Test->Log * Sin(5.62) * Test->LH /4.566

There are several formulas that get executed based on logics which process the data in cycles.

I want to send only the values that are changing whereas now I am transfering the entire data every 2 seconds.

Is there any better way of identifying only the changed data to send it. Please help.

Re: Exchanging data using CSocket

Jochen Arndt22-Apr-16 23:30

Jochen Arndt

22-Apr-16 23:30

Just define your own protocol by sending a header first. In this header you tell the other site which data will be send.

Example:

C++

enum MyPacketData {
    AllData = 0,
    LhData,
    XsData,
    // ....
};

typedef struct {
    MyPacketData contentType;
    // Optional additional data  
} MyPacketHeader;

// Send all data
MyPacketHeader header;
header.contentType = AllData;
socket.Send(&header, sizeof(header));
socket.Send(pData, sizeof(ModData));

// Send specific data
MyPacketHeader header;
header.contentType = SsData;
socket.Send(&header, sizeof(header));
socket.Send(pData->SS, sizeof(ModData.SS));

Re: Exchanging data using CSocket

manoharbalu24-Apr-16 20:23

manoharbalu

24-Apr-16 20:23

Thanks for the Reply.

Iam sorry that I didnt mention my query clearly.

A Shared memory using CreateFileMapping function is created by the Server application to share the ModData with another process named 'Plantmodel' running local which does the most of the calculations.
A GUI Client is also connected to the Server using sockets which gets the User inputs anytime. So the User gives an input anytime which is send to the server through sockets and the server updates the input in the shared memory and the plantmodel process which is already doing all the calculations in 250millisecs takes this input too. So at anypoint of time the real time data is available at the server.

My actual question is...Is there anyway to find out only the data that is changed from the big structure from the server side, so that i could use a function to update it to the other client application instead of sending the entire data.

Re: Exchanging data using CSocket

Jochen Arndt24-Apr-16 20:53

Jochen Arndt

24-Apr-16 20:53

It can be still done with my solution. Just send a message after each data update indicating whch data has been changed. If you need to track the changings, you may add another structure containing flags for the elements. However, in this case the flags must be cleared when the clients has processed the update (sending some kind of acknowledgement in the other direction).

Adding UI to an existing console project using windows form

Member 935023722-Apr-16 6:05

Member 9350237

22-Apr-16 6:05

Hi all!,

I'm planning to create a windows form based UI to my existing console project. Would be great if someone can give a detailed step-wise procedure for the same.

Here is the part of my code shows what all parameters I need to get through console:

C++

printf ("\n");
  printf ("-----------------------------------\n");
   printf ("\n\n");

  printf ("Dyad name:");
  scanf("%s",fname);
  printf ("\n\n");

      printf ("Epoch number [1-%d]:",NEPOCHS);
  scanf("%d",&epoch);
  printf ("\n\n");

  printf("Group: Haptic (0) or Visuo-haptic (1):");
  scanf("%d",&lineEnable);
  printf ("\n\n");

  switch(lineEnable){
  case 0: // Haptic
      strcpy(prefix,"haptic");
      break;
  case 1: // Visuo-Haptic
      strcpy(prefix,"visuohaptic");
  }

  printf ("\n\n");
  printf ("[x] - Exit application\n");
  printf ("\n\n");

Thank you!

Re: Adding UI to an existing console project using windows form

Richard MacCutchan22-Apr-16 6:47

Re: Adding UI to an existing console project using windows form

22-Apr-16 6:47

Windows forms applications and console applications are quite different. If you want a full GUI then create a Forms application from scratch. However, since this is C++ you may like to investigate the Windows API or MFC.

[edit]
This looks much the same as your question of last June[^].

[/edit]

Member 935023725-Apr-16 21:51

Member 9350237

25-Apr-16 21:51

Thank you very much for the information

Re: Adding UI to an existing console project using windows form

leon de boer24-Apr-16 15:49

leon de boer

24-Apr-16 15:49

There is nothing very difficult you just need to deal with the console input/outpur code and put it
into a window or dialog. The "Main" function becomes "WinMain" and you change the compilation from
console to Win GUI.

Normally its fairly trivial as everything but the user input/output elements will compile as is.

Generally you just look at your console input/output and sketch out a couple of screens on paper
then build that and start replacing the console calls into those screens.

In that example above it would just be a dialog or window with the entry boxes. When the user
has entered them you would press a button .. Ok/Continue etc ... check the entries are valid ..
do what you want with them and continue on. It isn't really that hard.

The start point is as always build the GUI screen skeleton to move you program into it. Here
is a 5min mock up of your code you posted. I would probably use more advanced entry for epoch
but I limited myself to 5min

#define _WIN32_WINNT 0x0500
#include <windows.h>
#include <string.h>

#define ID_DYANNAME 100
#define ID_EPOCHNUMBER 101
#define ID_GROUPBUTTONS 102
#define ID_HAPTIC 103
#define ID_VISUOHAPTIC  104
#define ID_PROCESS     200

// This is your Data you want
char FName[256] = { 0 };
int epoch = 0;
char prefix[256] = { 0 };

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {

	switch (msg) {
	case WM_CREATE: {
				CreateWindowEx(0, "STATIC", "Dyad name:",
					WS_VISIBLE | WS_CHILD | SS_RIGHT,
					20, 20, 300, 20,
					hwnd, 0, 0, 0);
				CreateWindowEx(0, "EDIT", "",
					WS_VISIBLE | WS_CHILD | WS_BORDER | ES_LEFT,
					330, 20, 100, 20,
					hwnd, (HMENU) ID_DYANNAME, 0, 0);
				CreateWindowEx(0, "STATIC", "Epoch number [1-%d]:",
					WS_VISIBLE | WS_CHILD | SS_RIGHT,
					20, 50, 300, 20,
					hwnd, 0, 0, 0);
				CreateWindowEx(0, "EDIT", "",
					WS_VISIBLE | WS_CHILD | WS_BORDER | ES_LEFT,
					330, 50, 100, 20,
					hwnd, (HMENU) ID_EPOCHNUMBER, 0, 0);

				/*Group for Radio button for haptic or visuo-haptic */
				CreateWindowEx(WS_EX_WINDOWEDGE,
					"BUTTON",
					"Select Mode:",
					WS_VISIBLE | WS_CHILD | BS_GROUPBOX,
					120, 80,
					320, 70,
					hwnd,
					(HMENU) ID_GROUPBUTTONS,
					0, NULL);
				HWND Button = CreateWindowEx(WS_EX_WINDOWEDGE,
					"BUTTON",
					"Haptic",
					WS_VISIBLE | WS_CHILD | BS_AUTORADIOBUTTON | WS_GROUP,
					130, 100,
					200, 20,
					hwnd,
					(HMENU) ID_HAPTIC,
					0, NULL);
				CreateWindowEx(WS_EX_WINDOWEDGE,
					"BUTTON",
					"Visuo-haptic",
					WS_VISIBLE | WS_CHILD | BS_AUTORADIOBUTTON,
					130, 125,
					200, 20,
					hwnd,
					(HMENU) ID_VISUOHAPTIC,
					0, NULL);

				// Set the Haptic checkbox
				SendMessage(Button, BM_SETCHECK, BST_CHECKED, TRUE);

				CreateWindowEx(0, "BUTTON", "PROCESS ENTRY",
					WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,
					150, 165, 200, 50,
					hwnd, (HMENU) ID_PROCESS, 0, 0);
			}
			break;
		case WM_COMMAND:
			switch LOWORD(wParam){
				case ID_PROCESS: {
					// Fetch FName
					GetWindowText(GetDlgItem(hwnd, ID_DYANNAME), &FName[0], sizeof(FName));

					// Fetch NEPOCHS its in text format the convert it
					char Temp[256];
					GetWindowText(GetDlgItem(hwnd, ID_EPOCHNUMBER), &Temp[0], sizeof(Temp));
					epoch = atoi(Temp);

					// Fetch buttons
					if (SendMessage(GetDlgItem(hwnd, ID_HAPTIC), BM_GETCHECK, 0, 0)){
						strcpy_s(prefix, sizeof(prefix), "haptic");
					}
					if (SendMessage(GetDlgItem(hwnd, ID_VISUOHAPTIC), BM_GETCHECK, 0, 0)){
						strcpy_s(prefix, sizeof(prefix), "visuohaptic");
					}

					// You data is ready to process ... we will just tell you and exit program
					MessageBox(0, "You will process you data now", "ENTRY DONE", MB_OK);
					PostMessage(hwnd, WM_CLOSE, 0, 0);
					
				}
				break;
			}
			break;
		case WM_DESTROY: {
			PostQuitMessage(0);
			return 0;
		}
	}
	return DefWindowProc(hwnd, msg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow){
	MSG  msg;
	HWND hwnd;
	WNDCLASSEX wc = { 0 };

	wc.cbSize = sizeof(wc);
	wc.lpszClassName = "DemoDialog";
	wc.hInstance = hInstance;
	wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
	wc.lpfnWndProc = WndProc;

	RegisterClassEx(&wc);
	hwnd = CreateWindow (wc.lpszClassName, "Demo Window",
		WS_OVERLAPPEDWINDOW | WS_VISIBLE,
		200, 200, 500, 280, NULL, NULL, hInstance, NULL);

	while (GetMessage(&msg, NULL, 0, 0)) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return (int) msg.wParam;
}

In vino veritas

modified 24-Apr-16 23:42pm.

Re: Adding UI to an existing console project using windows form

Member 935023725-Apr-16 21:55

Member 9350237

25-Apr-16 21:55

Thank you so much for the information

Code Blocks giving fatal error of not finding header file when there are seperate class files

Mur250122-Apr-16 3:07

Mur2501

22-Apr-16 3:07

When I made a separate class file in code blocks and compiled it. Code blocks gived a fatal error of 'No such file or directory' and had the address of the project. I have re checked every thing but there is no problem in codes or in anything else. I have made the class using the class wizard in code blocks and also checked the box saying to keep header and source file in same directory and they are in same directory. Please tell me any suggestion on solving this problem.

Re: Code Blocks giving fatal error of not finding header file when there are seperate class files

Richard MacCutchan22-Apr-16 4:15

Re: Code Blocks giving fatal error of not finding header file when there are seperate class files

22-Apr-16 4:15

You need to provide more detailed information. Please show the code that produces the error, and where the files are that it complains about?

David Crow22-Apr-16 17:58

David Crow

22-Apr-16 17:58

Mur2501 wrote:
When I made a separate class file in code blocks...

Doesn't Code Blocks (the IDE) have a forum?

"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

Can DDX_Text be used with CTEXT resource item

ForNow21-Apr-16 16:58

21-Apr-16 16:58

The Documentation says DDX_Text is for a edit control and I am getting an assertation

So maybe I have to use GetDlgItem and SetWindowText to set the text of the CTEXT

Thankx

Richard MacCutchan21-Apr-16 20:48

21-Apr-16 20:48

What assertion, and what code?

ForNow22-Apr-16 3:26

22-Apr-16 3:26

I apologize I had the wrong dialog identifier thus the wrong dialog control

Victor Nijegorodov22-Apr-16 0:39

Victor Nijegorodov

22-Apr-16 0:39

ForNow wrote:
The Documentation says DDX_Text is for a edit control and I am getting an assertation

So maybe I have to use GetDlgItem and SetWindowText to set the text of the CTEXT

You can use DDX_Text for static controls.
Another way is to create the control member variable (using DDX_CONTROL) and then use this variable to call SetWindowText.

Where and how do you call the DDX_Text from? Perhaps you call it before the base class OnInitDialog was called?

ForNow22-Apr-16 3:25

22-Apr-16 3:25

I apologize I had the wrong dialog identifier thus the wrong dialog control

code path for DoModal

ForNow17-Apr-16 6:21

17-Apr-16 6:21

My Cdialog (modeless) is looking for some user input

Therefore the modal dialog I want to save and process the input

so to get the info I do a DoModal I save the info in the modal CDialog Class (created on the stack) when myokhandler returns (this is only when the user press "X" in the right hand window corner)

It return to the CDialog procedure that called the DoModal however the data doesn't seem to be valid

Isn't the storage for modal dialog still intact till I do the EndDialog ?

Victor Nijegorodov17-Apr-16 6:58

Victor Nijegorodov

17-Apr-16 6:58

ForNow wrote:
... this is only when the user press "X" in the right hand window corner

When the user press "X" in the right hand window corner no data from dialog controls are read in the control data variables. It is by design.
If you'd like to change this default behavior then you had to override the OnCancel method.

ForNow17-Apr-16 7:07

17-Apr-16 7:07

The data was saved in the Class/Object storage in my Onok handler

Does it not remain intact till I do the EndDialog which I do from the routine which did the the DoModal ?

leon de boer17-Apr-16 7:54

leon de boer

17-Apr-16 7:54

The Data is probably still there you have blown the stack I suspect. Read the documentation again

CDialog::OnCancel[^]

Read it carefully because it is very specific.

If you implement the Cancel button in a modeless dialog box, you must override the OnCancel method and call DestroyWindow inside it. Do not call the base-class method, because it calls EndDialog, which will make the dialog box invisible but not destroy it.

So your Dialog when cancelled will be invisible and not destroyed and I suspect your stack just got toasted hence the reason for the big warning.

So do what it asks override the OnCancel method calling DestroyWindow inside it because there is a reason the framework requires that and I am guessing not doing it will be a very bad idea. I can't tell you why it has to do that it is something to do with the framework implementation.

In vino veritas