Re: Clearing the edit box in ccombobox - C / C++ / MFC Discussion Boards

Re: Fast keyword Search through CSortedArray?? anyone?

Stephen Hewitt27-Sep-06 20:40

27-Sep-06 20:40

Try something like this. It uses binary searches so it will be many, many times faster then using linear searches. It’s a simple console app which reads in words from a file (each word in the file separated by any white space). It is not limited to only matching a single charcter; you can match all words which start with "act" for example.
------------------------

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <algorithm>
#include <iterator>
#include <functional>

struct PrefixMatchLess : std::binary_function<std::string, std::string, bool>
{
bool operator()(const std::string &s, const std::string &prefix) const
{
const std::string sub = s.substr(0, prefix.length());
return sub<prefix;
}
};

struct PrefixMatchGreater : std::binary_function<std::string, std::string, bool>
{
bool operator()(const std::string &prefix, const std::string &s) const
{
const std::string sub = s.substr(0, prefix.length());
return sub>prefix;
}
};

int main()
{
// For notational convenience.
using namespace std;
typedef vector<string> StringList_t;
typedef istream_iterator<string> StringInIt_t;
typedef ostream_iterator<string> StringOutIt_t;

// Open the word list.
ifstream ifs("C:\\Words.txt");
if (!ifs)
{
cerr << "Failed to open word list!" << endl;
return 1;
}

// List for words.
StringList_t words;

// Read in the word list.
copy(StringInIt_t(ifs), StringInIt_t(), back_inserter(words));

// Sort the list and remove duplicates.
sort(words.begin(), words.end());
words.erase(unique(words.begin(), words.end()), words.end());

// Output the word list (diagnostic).
cout << "Word list:" << endl;
copy(words.begin(), words.end(), StringOutIt_t(cout, "\n"));
cout << endl;

for(;;)
{
// Get the prefix to search for.
string word;
cout << "Enter search prefix (! quit): ";
cin >> word;

// Check if the user wants to quit.
if (word=="!")
{
break; // Quit.
}

cout << endl;

// Calculate range.
StringList_t::iterator b = lower_bound(words.begin(), words.end(), word, PrefixMatchLess());
StringList_t::iterator e = upper_bound(b, words.end(), word, PrefixMatchGreater());

// Output results.
cout << "Matching words:" << endl;
copy(b, e, StringOutIt_t(cout, "\n"));
cout << endl;
}

return 0;
}

Steve

Clearing the edit box in ccombobox

lctrncs27-Sep-06 9:30

lctrncs

27-Sep-06 9:30

I am a beginner trying to clear the edit box of a combobox in drop list mode after making a selection from the list.

after selecting a list box entry, the control places a copy of it in the edit box by default, apparently using the SelectString member and the message WM_SETTEXT as part of the controls windows procedure.

when the dropdown type is used, ->SetEditSel and ->Clear etc will empty the edit box, (though not very elegantly). but the dropdown type still allows users enter text in the edit box (which is confusing and non-functional)

the drop list type prevents user edits of the edit box, but ->SetEditSel and ->Clear etc no longer appears to clear the edit box to pretty things up after selection.

I have tired many things already, and am considering trying to trap WM_SETTEXT or paint over the edit box somehow

I wonder if I am not missing some ridiculously minor thing (as I was before I realized the drop list type prevented user edits to the edit box)

Any suggestions about what I can do with/to my combobox control to prevent, clear or overwrite unwanted edit box text matching my selection in the list box?

Thanks to all...

"For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." Richard Feynman, Minority Report to the Official Report on the Space Shuttle Challenger Crash