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simon_brown75

Listbox problem

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Hi,

I've recently switched from Visual C++ 6 Pro to Visual C++ 2010 Express and I'm having problems bringing an old program up-to-date.

The code in question is-

char str [255] = "";
sprintf ( str, "%d x %d - 32 bit - %d Hz", g_pAdapters[current].AdapterModes[n].Width,
g_pAdapters[current].AdapterModes[n].Height, g_pAdapters[current].AdapterModes[n].RefreshRate );
SendDlgItemMessage ( hwnd, ID_LB2, LB_ADDSTRING, 0, (LPARAM)str );


First thing, VC++ is warning me to use sprintf_s, so I change the code to this-

char str [255] = "";
sprintf_s ( str, 255, "%d x %d - 32 bit - %d Hz", g_pAdapters[current].AdapterModes[n].Width,
g_pAdapters[current].AdapterModes[n].Height, g_pAdapters[current].AdapterModes[n].RefreshRate );
SendDlgItemMessage ( hwnd, ID_LB2, LB_ADDSTRING, 0, (LPARAM)str );


The problem - whether I use sprintf or sprintf_s, my listbox is just full of gibberish (see attached image). I've no idea what's going on. Btw the values in Width, RefreshRate etc are all correct because I output them to a text file later in the code. Obviously either sprintf_s isn't doing what I'm expecting, or I'm sending the add string request to the dialogue box wrong.

Please help,
Simon.

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Didn't do Windows UI for several years, so here I can only give my guess.
SendDlgItemMessage is Ansi or Unicode version?
I guess it's Unicode version in 2010 by default?

Can you try,
1, call SendDlgItemMessageA instead of SendDlgItemMessage in your current code?
2, or pass a wide string, such as L"abc" to SendDlgItemMessage and test again.

To nail down your problem you can use some simple text to test instead of sprintf.

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