C / C++ / MFC

Member 13433022 wrote:

regardless of the order in which those paragraphs are placed in the two different files

• Read file 2 completely into allocated memory (one more byte to append a NULL char)
  
• Count the number of lines (number of LF chars)
  
• Allocate a buffer for char* pointers to hold the pointers to the beginning of each line
  
• Fill the line pointer buffer (search for next LF and store address plus one)
  
• Read file 1 line by line and check if that line matches any line from the file 2 buffer
  
• If there is no match, write the line to file 3
  

// Maybe not all required header are shown here
#include <stdio.h>
#include <sys/stat.h>

// Get file size, allocate buffer, and read file 2 into memory
struct stat st;
stat(file2, &st);
char *buf = new char[st.st_size + 1];
FILE *f2 = fopen(file2, "rb");
fread(buf, 1, st.st_size, f2);
fclose(f2);
buf[st.st_size] = 0;

// Count lines
unsigned lines = 0;
char *p = buf;
while (NULL != (p = strchr(p, '\n')))
{
    p++;
    lines++;
}

// Get line pointers
char **lineptr = new char* [lines+1];
p = buf;
unsigned i = 0;
lineptr[0] = buf;
while (NULL != (p = strchr(p, '\n')))
{
    lineptr[++i] = ++p;
}

// Must be large enough to hold max. line length
char linebuf[1024];
FILE *f1 = fopen(file1, "rb");
FILE *f3 = fopen(file3, "wb");
do
{
    if (NULL == fgets(linebuf, sizeof(linebuf), f1))
        break;
    if (0 == linebuf[0])
        break;
    // Ignore empty lines
    if ('\r' == linebuf[0] || '\n' == linebuf[0])
        continue;
    for (i = 0; i < lines; i++)
    {
        if (0 == strncmp(linebuf, lineptr[i], strlen(linebuf)))
            break;
    }
    if (i >= lines)
        fputs(linebuf, f3);
}
while (!feof(f1));
fclose(f3);
fclose(f1);
delete [] lineptr;
delete [] buf;

Member 13433022 wrote:

Since I do not have experience in programming,

class KeyStroke
{
    public KeyStroke(int numlines, CRichEditCtrl* myrichptr)
    {
        // the one you will mainly use
    }
    public KeyStroke()
    {
        // the compiler will not infer this because you have created the one above

        // if you do not provide any constructors then the compiler will automatically
        // create the parameterless one.
    }

\progedit.cpp(13): error C2062: type 'int' unexpected

1>  progdialog.cpp

CProgedit::CProgedit(int numlines, CProgedit* editptr) : KeyStroke(int numlines, CProgedit* editptr)

KeyStroke::KeyStroke()
{
}
    KeyStroke::KeyStroke(int numlines, CRichEditCtrl* editptr)
    {
        max_line = numlines;
        edit_ptr = editptr;
    }

CProgedit::CProgedit(int numlines, CProgedit* editptr) : mykeys(numlines, editptr)

ForNow wrote:

CProgedit::CProgedit(int numlines, CProgedit* editptr) : KeyStroke(int numlines, CProgedit* editptr)

CProgedit::CProgedit(int numlines, CProgedit* editptr) : KeyStroke(numlines, editptr)

CProgedit::CProgedit(int numlines, CProgedit* editptr) : mykey(numlines, editptr)