Rich Text box Questions

[Senith]

ok so I manage to create a RICHEDIT with:
[code]rtfctl = CreateWindow("RICHEDIT","text",WS_BORDER|WS_CHILD|WS_VISIBLE|ES_MULTILINE|WS_VSCROLL|WS_HSCROLL,10,10,300,300,MAINSS,0,hInstance,0);[\CODE]

Now heres where I'm stuck at

1. I have it set to multiline and both scrollbars are visible. But the text won't go beyond horizontally.
If I remove the multiline then it will go beyond it but then it will only be that one line.

2. How can I introduce syntax highlighting for it?

In VB I would then find the word and use selcolor and similar functions to change the color but this method would slow down after a couple of lines.

So I asked about it and someone told me I need to parse it. How do I go about doing that?

Thanks

[olivthill2]

In VB I would then find the word and use selcolor and similar functions to change the color

In C, once you find a word, you can change the color of its characters with the following piece of code:

/* =================================================================
   Write a character in the RTF control
   ================================================================= */
int RTFEDIT_putc(char c, COLORREF col, int h, int x)
{
   CHARFORMAT cf; char buf[2]; // HDC hdc;

   Edit_Enable(hRTF, FALSE);

   ZeroMemory(&cf, sizeof(CHARFORMAT));
   cf.cbSize = sizeof(CHARFORMAT);
   cf.dwMask = CFM_BOLD | CFM_COLOR | CFM_ITALIC |
                          CFM_SIZE | CFM_UNDERLINE;
   cf.dwEffects = 0;
   if (h > 0)
      cf.yHeight = h;
   else
      cf.yHeight = 160;
   cf.yOffset = 0;
   if (col > 0)
      cf.crTextColor = col;
   else
      cf.crTextColor = RGB(0,0,0);

   Edit_SetSel(hRTF, x, x+1);
   buf[0] = c; buf[1] = '\0';
   SendMessage(hRTF, EM_SETCHARFORMAT, SCF_SELECTION, (LPARAM) &cf);
   Edit_ReplaceSel(hRTF, buf);
   Edit_SetSel(hRTF, 0, 0);

   Edit_Enable(hRTF, TRUE);

   return TRUE;
}

this method would slow down

Not much. Try.

So I asked about it and someone told me I need to parse it

Parsing has nothing to do with speed. It means "finding something". It's already the method you were using in VB.

[Senith]

Originally Posted by olivthill2

In C, once you find a word, you can change the color of its characters with the following piece of code:

/* =================================================================
   Write a character in the RTF control
   ================================================================= */
int RTFEDIT_putc(char c, COLORREF col, int h, int x)
{
   CHARFORMAT cf; char buf[2]; // HDC hdc;

   Edit_Enable(hRTF, FALSE);

   ZeroMemory(&cf, sizeof(CHARFORMAT));
   cf.cbSize = sizeof(CHARFORMAT);
   cf.dwMask = CFM_BOLD | CFM_COLOR | CFM_ITALIC |
                          CFM_SIZE | CFM_UNDERLINE;
   cf.dwEffects = 0;
   if (h > 0)
      cf.yHeight = h;
   else
      cf.yHeight = 160;
   cf.yOffset = 0;
   if (col > 0)
      cf.crTextColor = col;
   else
      cf.crTextColor = RGB(0,0,0);

   Edit_SetSel(hRTF, x, x+1);
   buf[0] = c; buf[1] = '\0';
   SendMessage(hRTF, EM_SETCHARFORMAT, SCF_SELECTION, (LPARAM) &cf);
   Edit_ReplaceSel(hRTF, buf);
   Edit_SetSel(hRTF, 0, 0);

   Edit_Enable(hRTF, TRUE);

   return TRUE;
}

Not much. Try.
Parsing has nothing to do with speed. It means "finding something". It's already the method you were using in VB.

Cool thanks for the code. If you don't mind though could you explain how it works please?

Also how can I make the text go beyond the right side of the rtf textbox?

Like I said once it gets there it goes to a new line.

Thanks again

[VladimirF]

Originally Posted by Senith

Also how can I make the text go beyond the right side of the rtf textbox?

Like I said once it gets there it goes to a new line.

Try to set ES_AUTOHSCROLL style.

[Senith]

Originally Posted by VladimirF

Try to set ES_AUTOHSCROLL style.

Yes that worked!

Thank you!

[Senith]

ok so I took the code and added comments. Now the comments that I added, are the comments correct or wrong?

Also if you see //??? bla bla bla then that means I think I know what it is but still don't know or I don't know

Thanks

/* =================================================================
   Write a character in the RTF control
   ================================================================= */
int RTFEDIT_putc(char c, COLORREF col, int h, int x)// Custom Function
{
   CHARFORMAT cf; char buf[2]; // HDC hdc; // Declarations

   Edit_Enable(hRTF, FALSE);// Disables the RTF Edit box

   ZeroMemory(&cf, sizeof(CHARFORMAT)); //???
   cf.cbSize = sizeof(CHARFORMAT);      //???
   cf.dwMask = CFM_BOLD | CFM_COLOR | CFM_ITALIC |CFM_SIZE | CFM_UNDERLINE;// What will be edited
   cf.dwEffects = 0;//??? Effects like tranparency
   if (h > 0)
      cf.yHeight = h; ;//??? Hight of the text
   else
      cf.yHeight = 160;//??? Hight of the text
   cf.yOffset = 0;//???
   if (col > 0)
      cf.crTextColor = col;// Sets the color from col
   else
      cf.crTextColor = RGB(0,0,0);// Sets the color Black

   Edit_SetSel(hRTF, x, x+1);// Sets the Selection
   buf[0] = c; buf[1] = '\0';//???
   SendMessage(hRTF, EM_SETCHARFORMAT, SCF_SELECTION, (LPARAM) &cf);// Sends data to RTF Edit
   Edit_ReplaceSel(hRTF, buf);// Replaces the selected text
   Edit_SetSel(hRTF, 0, 0);// Sets the Selection to

   Edit_Enable(hRTF, TRUE); // Enable the RTF Edit Box

   return TRUE;// Returns to the main program
}

[olivthill2]

ZeroMemory(&cf, sizeof(CHARFORMAT)); //???
cf.cbSize = sizeof(CHARFORMAT);      //???

This is needed because you can have different structures having the same name, CHARFORMAT, depending on your version of Windows. This is the same for other standard structures, which may have more fields in some Windows' versions than in others. The classical example is OPENFILENAME which have a different number of fields, and therefore a different size in different versions of Windows. You should clear the memory because otherwise you should fill every field, and it is easier to zero the memory than to remember the name of every field, since they may not be the same from one version to the other, and you remember only important fields.

cf.dwEffects = 0;//??? Effects like tranparency

See guide.

   if (h > 0)
      cf.yHeight = h; ;//??? Hight of the text
   else
      cf.yHeight = 160;//??? Hight of the text
   cf.yOffset = 0;//???

Yes, it is the height of a character and it is on the standard line, not above or below. See guide.

buf[0] = c; buf[1] = '\0';//???
Edit_ReplaceSel(hRTF, buf);// Replaces the selected text

Edit_ReplaceSel() needs a null terminated string. I work with only one character, c, at a time, but you can work with a word or a sentence.
Your other comments are correct.

[Senith]

cool thanks for pointing that out

Also I came across an error in Dev C++

its saying that CHARFORMAT does not name a type.

So I think its saying that it doesn't exists like if I use handle instead of HWND.

Do I need to include a library?

[hoxsiew]

I don't know about DevC++, but CHARFORMAT should be a macro that evaluates to CHARFORMATA or CHARFORMATW depending on the build. It should be defined in richedit.h:

#if (_RICHEDIT_VER >= 0x0200)
#ifdef UNICODE
#define CHARFORMAT CHARFORMATW
#else
#define CHARFORMAT CHARFORMATA
#endif // UNICODE 
#else
#define CHARFORMAT CHARFORMATA
#endif // _RICHEDIT_VER >= 0x0200

[olivthill2]

I use dev_cpp.
At the begining of my file, I have:

#include <windows.h>
#include <windowsx.h>
#include <richedit.h>
#include <commdlg.h>

I don't link with any particular libraries.
I have

    if (!hRTFLib)
      hRTFLib = LoadLibrary("RICHED32.DLL");
    if (!hRTFLib) {
        char szErr[255];
        wsprintf(szErr, "LoadLibrary RICHED32.DLL failed. Error code %ld", GetLastError());
        MessageBox(hWndParent, szErr, "Error", MB_OK );
        hRTFLib = NULL;
        return FALSE;
    }
    hRTF = CreateWindow("RICHEDIT",          // Class Name of RTF Edit
                        "",                  // Text of edit control
                        WS_CHILD   | WS_VISIBLE | ES_MULTILINE   |
                        WS_VSCROLL | WS_BORDER  |
                        ES_AUTOVSCROLL | ES_NOHIDESEL, // Window style
                        0, 0,                // Initially create 0 size,
                        0, 0,                // Main Wnd's WM_SIZE handler will resize
                        hWndParent,          // Use main parent
                        (HMENU)0,            // ID of zero (we don't care)
                        (HINSTANCE) GetWindowLong(hWndParent, GWL_HINSTANCE), // This app instance owns this window
                        NULL                 // Don't need data in WM_CREATE
    );
    SetFocus(hRTF);
...

[Senith]

Originally Posted by olivthill2

I use dev_cpp.
At the begining of my file, I have:

#include <windows.h>
#include <windowsx.h>
#include <richedit.h>
#include <commdlg.h>

I don't link with any particular libraries.
I have

    if (!hRTFLib)
      hRTFLib = LoadLibrary("RICHED32.DLL");
    if (!hRTFLib) {
        char szErr[255];
        wsprintf(szErr, "LoadLibrary RICHED32.DLL failed. Error code %ld", GetLastError());
        MessageBox(hWndParent, szErr, "Error", MB_OK );
        hRTFLib = NULL;
        return FALSE;
    }
    hRTF = CreateWindow("RICHEDIT",          // Class Name of RTF Edit
                        "",                  // Text of edit control
                        WS_CHILD   | WS_VISIBLE | ES_MULTILINE   |
                        WS_VSCROLL | WS_BORDER  |
                        ES_AUTOVSCROLL | ES_NOHIDESEL, // Window style
                        0, 0,                // Initially create 0 size,
                        0, 0,                // Main Wnd's WM_SIZE handler will resize
                        hWndParent,          // Use main parent
                        (HMENU)0,            // ID of zero (we don't care)
                        (HINSTANCE) GetWindowLong(hWndParent, GWL_HINSTANCE), // This app instance owns this window
                        NULL                 // Don't need data in WM_CREATE
    );
    SetFocus(hRTF);
...

Yep I needed richedit.h Thanks for posting your code and helping me out with this.
Appreciate it !

Originally Posted by hoxsiew

I don't know about DevC++, but CHARFORMAT should be a macro that evaluates to CHARFORMATA or CHARFORMATW depending on the build. It should be defined in richedit.h:

#if (_RICHEDIT_VER >= 0x0200)
#ifdef UNICODE
#define CHARFORMAT CHARFORMATW
#else
#define CHARFORMAT CHARFORMATA
#endif // UNICODE 
#else
#define CHARFORMAT CHARFORMATA
#endif // _RICHEDIT_VER >= 0x0200

Yea, I needed richedit.h. Thanks for letting me know!


^_^