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dump list box into a string

Started by localrob2 Jan 15, 2007 at 2:51 PM 8 replies 1.1k views

Original Post

Jan 15, 2007 at 2:51 PM

I'm working with the win api listbox. Ultimately I'm trying to make a playlist creator, where I can select mp3s from one list box, add them to another, then write the 2nd list box to a text file. My question is, how do I dump the contents of a list box to a string? I don't have much experience using the windows api, so maybe I don't even want it dumped into a string, I'm not sure. Should I be adding the selected content from list box to an array each time it's selected, then printing the array?

Colin Jeanne

Jan 15, 2007 at 5:52 PM

For each element in the list box you'll need to write that to your file. There is no "dump all data to a string" message you can send.

localrob2

Jan 15, 2007 at 9:27 PM

Alright, but how do I do that?
I'm using SendMessage() with LB_ADDSTRING to add strings to the listbox, but I don't know how to take that element and write it to a file. Am I way in over my head here?

raz0r

Jan 15, 2007 at 9:57 PM

Quote:
Original post by localrob2
Alright, but how do I do that?

LB_GETCOUNT, LB_GETTEXTLEN, LB_GETTEXT.

localrob2

Jan 16, 2007 at 4:40 PM

Yes I am able to get an element from the listbox using LB_GETTEXT, it's an array of TCHARs, but I can write that to the file. Thanks.

Quote:
Write that data you're sending in SendMessage() to a "database"?

Isn't that kind of what's happening? I'm sending the message from one database to another. The database being a standard control listbox. I just didn't understand how I could grab and interpret the elements in the listbox.

AnthonyG

Jan 16, 2007 at 5:23 PM

Here you go :), I'm sure you know what headers to include(As I am too lazy to type directives at the moment).

I believe this is what you're looking for.

As far as I know, It's impossible to grab every item and stuff it into a string. What this function does, Is loop X times where X is the number of items in the listbox, and in each loop it writes the item data to a text file, Then moves downward until Lopp #==X

void DumpListboxToFile(char filename[],HWND listbox){  char LBItemBuffer[300];  FILE *file=fopen(filename,"a+");    for(int tick=0;tick<SendMessage(listbox,LB_GETCOUNT,0,0);tick++)  {    SendMessage(listbox,LB_GETTEXT,(WPARAM)tick,(LPARAM)LBItemBuffer);    fprintf(file,"%s\n",LBItemBuffer);  }  fprintf(file,"---------------------------------------\n");  fclose(file);}

Yep, That should work.

[Edited by - AnthonyG on January 16, 2007 6:23:05 PM]

raz0r

Jan 16, 2007 at 6:00 PM

Quote:
Original post by AnthonyG
As far as I know, It's impossible to grab every item and stuff it into a string.

Why would it be impossible? Other then that, there are some issues with the code that you've posted.

AnthonyG

Jan 16, 2007 at 6:46 PM

Forgive the grammar. I mean it's impossible in one function call, I.E. SendMessage(listbox,LB_GRABITALL,0,(LPARAM)Buffer);

Thank you for noticing the error, I fixed it :)

localrob2

Jan 17, 2007 at 6:46 PM

Thank you all for the help, this is what I ended up doing.

for(int j = 0;j<NumEntries;j++)     {	//get the length of the indexed element			LengthString = SendMessage(playList.hCntrl,LB_GETTEXTLEN,j,0);	//get the text of the element and put in tchBuffer	SendMessage(playList.hCntrl,LB_GETTEXT,j,(LPARAM) tchBuffer);	for(int i = 0;i<LengthString;i++)         	List << char(tchBuffer);	List << "\n\n";     }//no more entries in listbox

it is not the most efficient way, but it works

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