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[C++] Listbox

 
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TraxMate
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PostPosted: Sun Feb 08, 2009 5:37 pm    Post subject: [C++] Listbox Reply with quote
I want to add every letter in the alphabet to a listbox but I don't want to write every letter in it's own SendDlgItemMessage() so I tried to use a loop but it's just crashing the app.
Code:
LPCWSTR lpAlphabet = _T("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
for(int i = 0; i < lstrlen(lpAlphabet); i++)
   SendDlgItemMessage(hParent, IDC_KEYLIST, LB_ADDSTRING, 0, (LPARAM)lpAlphabet[i]);

Any ideas why that crashes but not this?
Code:
LPCWSTR lpAlphabet = _T("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
   for(int i = 0; i < lstrlen(lpAlphabet); i++)
      SendDlgItemMessage(hParent, IDC_KEYLIST, LB_ADDSTRING, 0, (LPARAM)lpAlphabet);
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slippppppppp
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PostPosted: Sun Feb 08, 2009 6:40 pm    Post subject: Reply with quote
char* lpAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
for( int i = 0; i <= lstrlen(lpAlphabet); i++ )
SendDlgItemMessage(hParent, IDC_KEYLIST, LB_ADDSTRING, 0, lpAlphabet[i]);
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killersamurai
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Location: Colorado
PostPosted: Sun Feb 08, 2009 6:43 pm    Post subject: Reply with quote
It needs to be null terminated. You are adding a string after all. Here is how I would of done it.

Code:

HWND hWnd = GetDlgItem(hWndDlg,IDC_LIST1);
TCHAR lpAlphabet[] = TEXT("A");

for (int i = 'A'; i <= 'Z'; i++)
{
lpAlphabet[0] = i;
SendMessage(hWnd, LB_ADDSTRING, 0, (LPARAM)lpAlphabet);
}
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TraxMate
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PostPosted: Mon Feb 09, 2009 12:15 am    Post subject: Reply with quote
Thanks killersamurai. It works.
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