Your code does the right thing for me.
Do you have some other code that you've not shown?
about creating listbox in vs2019
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(233.6, 78%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ETC%3C/text%3E%3C/svg%3E)
Tom Chen
1
Reputation point
When I created listbox using the following code, I got an unexpected wrong listbox as the picture shown.
-----------------------------
case WM_CREATE:
//
hListBox = CreateWindowW(_T("LISTBOX"), NULL, WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_TABSTOP| LBS_STANDARD,
20, 20, 260, 280,
hWnd, (HMENU)10000,
(HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE),
NULL);
SendMessage(hListBox, LB_ADDSTRING, 0, (LPARAM)_T("China"));
SendMessage(hListBox, LB_ADDSTRING, 0, (LPARAM)_T("America"));
SendMessage(hListBox, LB_ADDSTRING, 0, (LPARAM)_T("England"));
break;
-------------------------------------------
Windows development | Windows API - Win32
{count} votes
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Rita Han - MSFT 2,171 Reputation points2021-01-18T08:47:36.33+00:00 Hello @Tom Chen , your exact presented code piece works for me without reproducing this issue. So could you show a mini, complete and reproducible code sample?
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Viorel 125.7K Reputation points2021-01-18T08:52:32.01+00:00 Maybe it is caused by other, incorrect handlers. Do you process other messages inside this window procedure?
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Tom Chen 1 Reputation point
2021-01-18T09:25:06.263+00:00 there is a piece in the following section and the definition are "TCHAR buf[200] = _T("");" HWND hListBox=NULL;
Microsoft Visual Studio Community 2019
Version 16.8.3case WM_COMMAND
....
case 10000:
if (LBN_SELCHANGE == wmEvent)
{
WPARAM nCurIndex = (WPARAM)SendMessage((HWND)lParam, LB_GETCURSEL, 0, 0);
SendMessage((HWND)lParam, LB_GETTEXT, nCurIndex, (LPARAM)buf);
MessageBox(0, buf, 0, 0);
}
break;
.... -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(92.8, 12%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDL%3C/text%3E%3C/svg%3E)
David Lowndes 4,726 Reputation points2021-01-18T09:31:02.947+00:00 That's not a problem either.
Try starting from a new project and just add the bits you've shown here to see if you can reproduce it. -
Tom Chen 1 Reputation point
2021-01-18T09:31:21.04+00:00 I do not handle any other message, I just create a window desktop application, want to test the creating listbox function, I used this version, which version do you use?
Microsoft Visual Studio Community 2019
Version 16.8.3 -
Viorel 125.7K Reputation points
2021-01-18T09:34:32.103+00:00 I use Visual Studio 2019 too.
You can also make an archive and publish your problematic project to OneDrive or other repository, and give us the link to download it.
Or show the full code file here.
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RLWA32 51,456 Reputation points2021-01-18T09:59:42.713+00:00 (HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE),This line of code used to create the Listbox would be a problem in a 64-bit build. Use GetWindowLongPtr instead.
Also, is there a reason to call CreateWindowW to specify UNICODE when the rest of the code appears to use the generics (e.g., TCHAR, _T() macro, etc.)?
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David Lowndes 4,726 Reputation points
2021-01-18T09:08:49.36+00:00