C / C++ / MFC

Omar Al Qady wrote:

If anyone has any ideas I'd really appreciate it

void main( void )
{
    char szTemp[16],
         *pInput[3] = { "3x+2y-2.5z=9", 
                        "-2x+9y+12z=23.4", 
                        "4.2x-7y+9.6z=45.3" };
 
    int x = 0;
    double d1, d2, d3;
 
    for (char *p = pInput[0]; p && *p != '\0'; p++)
    {
        if (isalpha(*p))
        {
            szTemp[x] = '\0';
            // use atof(szTemp) here
            x = 0;
        }
        else if ('=' == *p)
            break;
        else
        {
            szTemp[x] = *p;
            x++;
        }
    }
}

rahuljin wrote:

also please tell me how to get the address of a text file which is in the same folder as the program ? i want to open it in the program, but the folder location may change

rahuljin wrote:

i want to know that how to read a file line by line using Readfile() function ??

Rajesh R Subramanian wrote:

Just the name of the file will do, if the file is present in the same directory as the program.

chandu004 wrote:

if i used CFileDialog, after user selects an input file from any other folder, from tha point onwards, specifying only the file name, will give an error coz, the newly selected folder need not have that file.
in this case ihad to use Getcurdirectory api.

Rajesh R Subramanian wrote:

CFileDialog?! So, you're using MFC. Then you must use CStdioFile class to read file (you said line by line) instead of ReadFile() and that will make things simpler for you

chandu004 wrote:

i was not the one who posted the thread and asked the question of reading line be line.

CFileDialog cfd(true);
if(cfd.DoModal() == IDOK)
{
  CString szSelectedFile = cfd.GetPathName();
  //File operations on szSelectedFile here.
}

Rajesh R Subramanian wrote:

Like I said, you can retrieve the full path of the file selected by the user by calling CFileDialog::GetPathName() if the user clicked OK.

Rajesh R Subramanian wrote:

If you are dealing with say 3 different files

GetModuleFileName

PathRemoveFileSpec

PathAppend

#include <windows.h>
#include <tchar.h>
#include <stdio.h>

#define BUFFER_SIZE 82

void main(int argc, TCHAR *argv[])
{
    HANDLE hFile; 
    DWORD dwBytesRead = 0;
    char ReadBuffer[BUFFER_SIZE] = {0}, ss[16] = {0};

    printf("\n");
   

    hFile = CreateFileA("c:\\ip.txt",               // file to open
                       GENERIC_READ,          // open for reading
                       FILE_SHARE_READ,       // share for reading
                       NULL,                  // default security
                       OPEN_EXISTING,         // existing file only
                       FILE_ATTRIBUTE_NORMAL, // normal file
                       NULL);                 // no attr. template
 
    if (hFile == INVALID_HANDLE_VALUE) 
    { 
        printf("Could not open file (error %d)\n", GetLastError());
        return; 
    }

    // Read one character less than the buffer size to save room for
    // the terminating NULL character.

    if( FALSE == ReadFile(hFile, ReadBuffer, BUFFER_SIZE-2, &dwBytesRead, NULL) )
    {
        printf("Could not read from file (error %d)\n", GetLastError());
        CloseHandle(hFile);
        return;
    }

    ReadBuffer[dwBytesRead+1]='\0';

    int i ,j;
    i = -1;
    while(ReadBuffer[i+1] != '\0')
    {
    j = -1;
    do
    {
        i++;
        j++;
        ss[j] = ReadBuffer[i];
    }while((ReadBuffer[i+1] != '\n')&&(ReadBuffer[i+1] != '\0'));
    ss[j] = '\0';
    printf("%s\n", ss);
    i++;
    }

    CloseHandle(hFile);
    return;
}

do
{
    i++;
    j++;
    ss[j] = ReadBuffer[i];    // Assume j now has a value of 15, so ss[15] = ReadBuffer[i]
}while((ReadBuffer[i+1] != '\n')&&(ReadBuffer[i+1] != '\0'));

ss[j] = '\0';    // j still has the value of 15, so you just replaced the value that was there with 0