C / C++ / MFC

Re: MFC Project Style "Visual Studio", but Single Document with multiple views

21-Aug-15 6:10

When you create your project you select a CView derived class for the view of the document. You can add more different views or create some of your own. The MFC templates have a few options if I remembr correctly, and there are samples in the MSDN website and elsewhere[^].

Member 853403522-Aug-15 21:43

Member 8534035

22-Aug-15 21:43

yes, you are right. I have overseen this!

When I create a MDI application, I am able to create several views by default already.

Actually my application should act like an SDI application. One document, on which I have several views. But when selecting SDI style in VS Project Wizard, I do not have this "tabbed document" style, which I would need.

In the case I am using MDI style, my challenge is now, to manipulate the MDI behaviour, that it acts like SDI.
A bit weird, but seems to be the fastest approach.

If this approach is reasonable, I should create a new thread for it in the forum....

Re: MFC Project Style "Visual Studio", but Single Document with multiple views

Richard MacCutchan23-Aug-15 1:09

Accessing struct member and getting error I do not know how to fix it.

23-Aug-15 1:09

Why not use https://msdn.microsoft.com/en-us/library/bb983705(v=vs.110).aspx[^].

Vaclav_21-Aug-15 4:08

Re: Accessing struct member and getting error I do not know how to fix it.

21-Aug-15 4:08

I am stuck again.
I have inherited this piece of code which basically associate SAM3X8E pins with hardware registers.
I think it is pretty clever usage of array of struct and it works fine.
The original code did not include convenient way to access ALL of the registers, so I am trying to build the missing registers from basis assignments.

The registers are related to "port" ( designated PIOA.. thru PIOF) so if I can get the port assigned to a pin I can build all of the missing registers.

Here is the code to get the the port info from first (test) pin:
P_DB is a pointer to pins array.

( I have left all of the support code here FYI )

....
regtype TEST = *P_DB.pPort; *p_DB[0] fails same way
//lcd_i2c.print( (int) P_DB[0].pPort, HEX); // test access first pin
...

Now here is the error message from compiler ( on TEST) and I have no idea how to fix it:

C:\DOCUME~1\Vaclav\LOCALS~1\Temp\build6265730787782115322.tmp\sketch\AAA_TFT_LCD.h: In member function 'void TFT_LCD::LCD_Writ_Bus(char, char, byte)':
C:\DOCUME~1\Vaclav\LOCALS~1\Temp\build6265730787782115322.tmp\sketch\AAA_TFT_LCD.h:4370:30: error: request for member 'pPort' in '((TFT_LCD*)this)->TFT_LCD::P_DB', which is of non-class type 'volatile uint32_t* [16] {aka volatile long unsigned int* [16]}'
regtype TEST = *P_DB.pPort;

The error on (int) P_DB[0].pPort, code is pretty much same.

I hope I have provided all of the info necessary so someone can suggest a solution on how to access the pPort member.

/* Types used for the tables below */
// theae are indexes to array - what a trick
//typedef struct _PinDescription
//{
// Pio* pPort ;
// uint32_t ulPin ;
// uint32_t ulPeripheralId ;
// EPioType ulPinType ;
// uint32_t ulPinConfiguration ;
// uint32_t ulPinAttribute ;
// EAnalogChannel ulAnalogChannel ; /* Analog pin in the Arduino context (label on the board) */
// EAnalogChannel ulADCChannelNumber ; /* ADC Channel number in the SAM device */
// EPWMChannel ulPWMChannel ;
// ETCChannel ulTCChannel ;
//} PinDescription ;
//
///* Pins table to be instanciated into variant.cpp */
//extern const PinDescription g_APinDescription[] ;

//// Number of pins defined in PinDescription array
//#define PINS_COUNT (79u)
//#define NUM_DIGITAL_PINS (54u)
//#define NUM_ANALOG_INPUTS (12u)
//
//#define digitalPinToPort(P) ( g_APinDescription[P].pPort ) so what is this refernce to .pPort
//#define digitalPinToBitMask(P) ( g_APinDescription[P].ulPin )
////#define analogInPinToBit(P) ( )
//#define portOutputRegister(port) ( &(port->PIO_ODSR) )
//#define portInputRegister(port) ( &(port->PIO_PDSR) )
//#define digitalPinHasPWM(P) ( g_APinDescription[P].ulPWMChannel != NOT_ON_PWM || g_APinDescription[P].ulTCChannel != NOT_ON_TIMER )
//
///*
// * Pins descriptions
// * global array of all pins descriptions as what type
// * Arduino/hardware/arduino/sam/variants/arduino_due_x/variant.cpp
//
// */
//extern const PinDescription g_APinDescription[]=
//{
// // 0 .. 53 - Digital pins
// // ----------------------
// // 0/1 - UART (Serial)
// { PIOA, PIO_PA8A_URXD, ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT, PIN_ATTR_DIGITAL, NO_ADC, NO_ADC, NOT_ON_PWM, NOT_ON_TIMER }, // URXD
// { PIOA, PIO_PA9A_UTXD, ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT, PIN_ATTR_DIGITAL, NO_ADC, NO_ADC, NOT_ON_PWM, NOT_ON_TIMER }, // UTXD
//
// // 2
<a href=""></a>[<a href="" target="_blank">^</a>]

Richard MacCutchan21-Aug-15 4:21

SOLVED : Accessing struct member and getting error I do not know how to fix it.

21-Aug-15 4:21

Firstly (and not for the first time) please put <pre> tags around your code so it is easy to read, (use the <t style="background-color:#FBEDBB">code link above the edit window) thus:

C++

regtype TEST = *P_DB.pPort;         *p_DB[0] fails same way
//lcd_i2c.print( (int) P_DB[0].pPort, HEX); // test access first pin

As to the error, you have Pio* pPort; in your structure, but you are trying to assign it to a regtype variable, so it needs a cast, or some conversion to the correct variable type.

Vaclav_21-Aug-15 5:57

Using #define wrong way ?

21-Aug-15 5:57

Thanks, but I found I already have the port data and do not need the access to the struct after all.

Vaclav_20-Aug-15 6:56

20-Aug-15 6:56

I am trying to build SAM3x8E registers database.
I though I could use serial of #define(s) to do that but run into a problem

In this sample I can build PIO_SODR but I cannot add another (port) offset to it - see PIOA_SODR.

I think the problem is my defines are not really int (32 bits) , but only symbols.
I did compare the (symbol) PIO_SODR to its true hex value and it failed.

BUT - I can add the first offset of 0x30 no problem. Ether plain add (+) or (|) or works.

Any help would be as always appreciated.

C++

/* MSD upper 16 bits byte base*/ 
#define SAM_MSB  0x400E               //MSD upper 16 bits byte base
 /* LSD lower 16 bits byte base */            
#define SAM_LSB  0xE00   
/* PIO offset from PIO A and up */           
#define PIO_OFFSET        0x200  
/* status ouput data register */            
#define PIO_SODR  SAM_MSB << 16 | SAM_LSB + 0x30       // base plus reg offset OK 
#define PIOA_SODR PIO_SODR + 0x200  // add in another offset fails

modified 20-Aug-15 13:13pm.

SOLVED Re: Using #define wrong way ?

k505420-Aug-15 7:10

k5054

20-Aug-15 7:10

#defines are not even symbols - when the pre-processor runs it replaces the #define "tag" with the associated text. You probably want to add brackets to the PIO_SODR and PIOA_SODR definitions

e.g.

#define PIO_SODR (SAM_MSB<<16|SAM_LSB+0x30)
#define PIOA_SODR (PIO_SODR + 0x200)

Vaclav_20-Aug-15 8:07

20-Aug-15 8:07

I think I got part of the answer - I am mixing logical operations with math so that is why the first #define works ( compare to value) AFTER I added brackets.
#define PIO_SODR (SAM_MSB << 16 | SAM_LSB + PIO_OFFSET) now passes the value test OK
#define PIOA_SODR (PIO_SODR + PIO_OFFSET)

But the additional offset does not work, but I am getting closer.
Thank for your help.

And it also helps to check if my #define(s) are not duplicated somewhere else !!!

Thanks

modified 20-Aug-15 15:08pm.

CPallini20-Aug-15 21:06

CPallini

20-Aug-15 21:06

Why don't you use enum (see, for instance "Avoiding #defines for constant data and using enums instead"[^])?

Vaclav_21-Aug-15 4:12

21-Aug-15 4:12

Mainly because the "core" program is build using defines and I am still not too comfortable using enum.
BTW after I "solved" this problem I have decided to "improve" on on it a got stuck again.
Life is fun.

How to send a text file from C to java and receive the same text file from java to C

Stefan_Lang31-Aug-15 22:02

Stefan_Lang

31-Aug-15 22:02

I can only agree with Carlo on this. More generally, whenever there is a suitable way to use standard language features instead of #define, use that standard language feature. Even if it means you need to type more!

Modern editors offer autocompletion that makes typing effort a non-argument! Moreover, code riddled with #define macros is much harder for editors to interpret, preventing it from offering correct and complete autocompletion lists. Therefore the use of #define has the very real potential to actually increase the typing effort by hamstringing the editors capabilities!

Besides, as you've already stated, #defines will just keep tripping you up. Most of the time it is due to their entire lack of context-related syntax checking at the time of writing. And sometimes it is because your macro name conflicts with another non-macro symbol in some totally unrelated part of the code - that latter issue will lead to obscure errors that can keep you busy for days. I am speaking from my own experience.

Therefore: save time - do not use #define unless there is no other way to achieve the intended results. And if you do, don't place these macros in a header that gets included in unrelated source files - either put them right into the source file that needs them, or, if there are multiple source files that need them, put the macros in a separate header just for that purpose.

GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)

venkat28vk18-Aug-15 20:57

venkat28vk

18-Aug-15 20:57

I would like to know how to send a text file from C to java, in which java has to receive the file and send it back to C. I have developed the code, but i am facing error in the receive function
#include<time.h>
#include<errno.h>
#include<stdio.h>
#include<fcntl.h>
#include<unistd.h>
#include<string.h>

#include<stdlib.h>
#include<sys stat.h="">
#include<sys time.h="">
#include<sys ioctl.h="">
#include<sys types.h="">
#include<arpa inet.h="">
#include<sys select.h="">
#include<sys socket.h="">

int send_text(int socket)

{
FILE *text;
char a[50];
int size, read_size, stat, packet_index;
char send_buffer[8008], read_buffer[8008];
int wrt=0,sock_fd,tsize=0;
packet_index = 1;
int i=0;
text = fopen("/home/sosdt009/Desktop/character3.txt", "r");
if (text == NULL)
{
printf("Error Opening text File:");
exit(-1);
}

printf("Getting text Size:\n");
gets(a);
fseek(text, 0, SEEK_END);
size = ftell(text);
fseek(text, 0, SEEK_SET);
printf("Total text size: %d \n", size);
gets(a);

//Send text Size

printf("Sending text Size:\n",size);
gets(a);
send(socket, (void *)&size, sizeof(size), 0);

/*do

{<br />
    stat = recv(socket, read_buffer, 1024, 0);

}*/while(stat < 0)
printf("Socket data:%s \n", read_buffer); 
gets(a);<br />
while(size>tsize) 
{

    //Read from the file into our send buffer
    read_size = fread(send_buffer,1,sizeof(send_buffer),text);
    printf("The size of send buffer:%c \n",send_buffer);
    gets(a);
    printf("The read size value is :%d \n", read_size);
    gets(a);

    //Send data through our socket 

    do
    {<br />
        stat = send(socket, send_buffer, read_size, 0);
        printf("The send size value is: %d \n", size);
        gets(a);
        printf("The read size value is: %d \n", read_size);
        gets(a);

    } while (stat < 0); 
    printf("Packet %d, sent %d bytes.\n", packet_index, read_size);
    gets(a);

    //packet_index++;
    //Zero out our send buffer

    tsize = tsize+read_size;
    printf("The tsize value is:%d \n",tsize);
    gets(a);
        memset(send_buffer,0, sizeof(send_buffer));

    if(read_size<=NULL)
    {
        printf("The connection is transferred to received text: \n");
        gets(a);
    }
}
fclose(text);
//close(socket);
printf("Text successfully send:\n");
gets(a);
return 0;

}

int receive_text(int socket)
{
int buffersize = 77,recv_size=0,read_size = 1, write_size,size;
char *pBuf,a[50],b[77];
int errnom,i;
FILE *textnew;
size_t rec;
textnew = fopen("/home/sosdt009/Desktop/receivednew.txt", "a");

if (textnew == NULL)

{

printf("Error has occurred, text file could not be opened \n");
return -1;
}

//Loop while we have not received the entire file yet

 while(read_size > 0)
{

        //ioctl(socket, FIONREAD, &buffersize);
        printf("The Buffersize is    :%d\n",buffersize);
        gets(a);
        printf("The size of socket is:%d\n",socket);
        gets(a);

    //We check to see if there is data to be read from the socket 

    if (buffersize > 0)
    {
        printf("Buffersize value is  :%d\n", buffersize);
        gets(a);
        pBuf = malloc(sizeof(b));
        if (!pBuf)
        {
            printf(errnom, "Memory Error Cannot Allocate!\n");
            gets(a);
            exit(-1);
        }

        //read_size = read(socket,pBuf,buffersize);
        //read_size = fread(pBuf,buffersize,1,textnew);

        read_size = recv(socket,pBuf,sizeof(pBuf),1);
        //memset(pBuf,'\0',sizeof(pBuf));
        printf("Read size value is :%d \n",read_size);
        gets(a);
        printf("Buffersize value is:%d \n",sizeof(pBuf));
        gets(a);

        /*if (read_size < 0)
        {
            printf("%d\n",strerror(errno));
            printf("Data not written to the file:\n");
            gets(a);
            goto free;
        }*/

        //Write the currently read data into our text file

        //write_size = write(textnew,read_size,pBuf);                //using write function
        write_size = fwrite(pBuf,1,sizeof(pBuf),textnew); 
        free(pBuf);
        printf("Write size value is   :%d \n",write_size);
        gets(a);
        printf("Buffer size value is  :%d \n",sizeof(pBuf));
        gets(a);            

        //Increment the total number of bytes read

        recv_size += read_size;
        printf("Received size value is:%d \n",recv_size);
        gets(a);
        printf("Read size value is    :%d \n",read_size);       
        gets(a);    
    }
}
free:
fclose(textnew);
close(socket);  
printf("Text Successfully Received:\n");
gets(a);
return 0;

}

int main(int argc,char *argv[])
{
int socket_desc;
struct sockaddr_in server;
char *parray,errnomu;

//Create socket

socket_desc = socket(AF_INET,SOCK_STREAM,0);
if(socket_desc == -1)
{
      printf("Could not create socket \n");
}
      memset(&server,0,sizeof(server));
      server.sin_addr.s_addr = inet_addr("10.170.0.38");
      server.sin_family = AF_INET;
      server.sin_port = htons(6999);

//Connect to remote server

      if (connect(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0)
      {

         printf(strerror(errnomu));<br />
         printf("Connect Error \n");
             return -1;<br />
          }

     puts("Connected");
     send_text(socket_desc);
     receive_text(socket_desc);
     close(socket_desc);
     return 0;

}

Re: How to send a text file from C to java and receive the same text file from java to C

Richard MacCutchan18-Aug-15 21:53