I am trying to get the text of a textedit control in a dialog in my Win32 C++ Application.
I am using the following block of code to get that, and also to test it.
HWND hCarRegNo = GetDlgItem( hDlg, IDC_REGNUMBER );
if( hCarRegNo )
{
LPWSTR carRegNo = NULL;
GetWindowText(hCarRegNo, carRegNo, 20);
MessageBox(hDlg, carRegNo, _T("Test"), MB_OK);
}
The MessageBox output is an empty string.
Where is my mistake?
Not allocating any memory for carRegNo. Try this
WCHAR carRegNo[20];
GetWindowText(hCarRegNo, carRegNo, 20);
After some more research, I have solved the problem: instead of LPWSTR, I had to use TCHAR carRegNo[256] to make this work.
HWND hCarRegNo = GetDlgItem( hDlg, IDC_REGNUMBER );
if( hCarRegNo )
{
TCHAR carRegNo[256] = L"";
GetWindowText(hCarRegNo, carRegNo, 256);
MessageBox(hDlg, carRegNo, _T("Test"), MB_OK);
}
Related
I am trying to obtain handle to SHELLDLL_DefView.
So, I have this code.
HWND hProgman = FindWindow(L"Progman", NULL);
HWND hWnd = FindWindowEx(hProgman, 0, L"SHELLDLL_DefView", NULL);
Eveyrtihing works OK, until I change in Windows desktop brackground to slideshow. Then when I search with spy++ hierarchy of the windows, than SHELLDLL_DefView has another parent. Now it is #32769 (Desktop) -> WorkerW -> SHELLDLL_DefView. So I can't find it. Problem is that when I try
HWND desktop = GetDesktopWindow();
HWND hWnd = FindWindowEx(desktop , 0, L"WorkerW", NULL);
HWND hWnd = FindWindowEx(hWnd, 0, L"SHELLDLL_DefView", NULL);
Than SHELLDLL_DefView is not found. WorkerW yes.
Can anybody help?
Your code only works on some Windows versions as "SHELLDLL_DefView" can be found under "WorkerW" or "Progman" and as you discovered there can be many windows under the "WorkerW" class (normal in Win7).
Microsoft Docs report EnumWindows() is more reliable than calling GetWindow()/FindWindowEx() functions in loops, so more universal code (tested on Windows 98/Windows 7) would look like this (say you want to refresh the desktop):
BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam) {
HWND hNextWin;
hNextWin = FindWindowExA(hwnd, 0, "SHELLDLL_DefView", 0);
if ( hNextWin ) {
// The correct desktop shell window under Progman/WorkerW will have only 1 child window!
if ( GetNextWindow(hNextWin, GW_HWNDNEXT) || GetNextWindow(hNextWin, GW_HWNDPREV) )
return true;
// We found correct handle
PostMessageA(hNextWin, WM_KEYDOWN, VK_F5, 0);
return false;
}
return true;
}
void main() {
EnumWindows(&EnumWindowsProc, 0);
}
I found the answer. Need to iterate through all WorkerW.
HWND destop = GetDesktopWindow();
HWND hWorkerW = NULL;
HWND hShellViewWin = NULL;
do
{
hWorkerW = FindWindowEx(destop, hWorkerW, L"WorkerW", NULL);
hShellViewWin = FindWindowEx(hWorkerW, 0, L"SHELLDLL_DefView", 0);
} while (hShellViewWin == NULL && hWorkerW != NULL);
I've been trying for a couple of hours to interrogate tooltips to give up the text they contain to no avail. I've found How to get tooltip text for a given HWND? and tried that without success.
This shouldn't be that hard. I'm just not sure what I'm doing wrong. Here's a section of my code:
BOOL CALLBACK EnumWindowsProc(
_In_ HWND hwnd,
_In_ LPARAM lParam
)
{
TCHAR className[200];
GetClassName(hwnd, className, _countof(className));
ASSERT(IsWindow(hwnd));
if (_tcscmp(className, _T("tooltips_class32")) == 0)
{
TOOLINFO ti = { 0 };
ti.cbSize = sizeof(TOOLINFO);
TCHAR text[500] = { 0 };
ti.lpszText = text;
ti.hwnd = GetParent(hwnd);
IsWindow(ti.hwnd);
ti.uId = GetDlgCtrlID(hwnd);
int result = SendMessage(hwnd, TTM_GETTEXT, _countof(text), (LPARAM)&ti);
CString info;
info.Format(_T("%p: %s \"%s\"\r\n"), hwnd, className, ti.lpszText);
CString& output = *(CString*)lParam;
output += info;
}
return 1;
}
void CTooltipVerifyDlg::OnTimer(UINT_PTR nIDEvent)
{
m_output = "";
VERIFY(EnumWindows(EnumWindowsProc, (LPARAM)&m_output));
SYSTEMTIME systemTime;
GetLocalTime(&systemTime);
CString text;
text.Format(_T("%02u:%02u:%02u.%03u\r\n"), systemTime.wHour, systemTime.wMinute, systemTime.wSecond, systemTime.wMilliseconds);
m_output = text + m_output;
this->UpdateData(FALSE);
CDialogEx::OnTimer(nIDEvent);
}
CTooltipVerifyDlg is a dialogue with a text box which I communicate to with m_output, a CString that is bound to the text box.
When the SendMessage call is done, something on my desktop (or even the desktop manager) crashes. Any ideas why it would be crashing and not giving me the text that I desire?
I'm trying to output text from Notepad window to console and it's always 0.
What I'm doing wrong?
int main()
{
HWND hwnd = (HWND)0x0031019C; // Window Handler of Notepad
char szBuf[4096];
HWND hwndEdit;
LRESULT result;
hwndEdit = FindWindowEx(hwnd, NULL, L"Edit", NULL); // Class for edit box
result = SendMessage(hwndEdit, WM_GETTEXT, sizeof(szBuf) / sizeof(szBuf[0]), (LPARAM)szBuf);
cout<<"Contents: \n"<<result;
cin.get();
return 0;
}
I tried print_f, but it outputs unreadable characters:
printf( "Contents: %s\n", result, szBuf );
It looks to me like you probably have a little bit of a mismatch happening.
Based on the L"Edit", you seem to be doing a Unicode build (otherwise, you'd get an error message about not being able to convert an wchar_t const[5] to LPCSTR, and the code wouldn't compile.
If you do a Unicode build, however, WM_GETTEXT is going to write Unicode data to your buffer, so you need to prepare for and use Unicode instead of narrow characters for your buffer.
For convenience, I've modified it a little to find Notepad instead of using a hard-coded Window handle.
#include <windows.h>
#include <stdio.h>
#define elements(b) (sizeof(b)/sizeof(b[0]))
int main() {
HWND hwnd; // Window Handler of Notepad
wchar_t buf[4096]={0};
HWND hwndEdit;
LRESULT result;
hwnd=FindWindowEx(NULL, NULL, L"Notepad", NULL);
hwndEdit=FindWindowEx(hwnd, NULL, L"Edit", NULL); // Class for edit box
result = SendMessage(hwndEdit, WM_GETTEXT, elements(buf), (LPARAM)buf);
printf("%S", buf);
return 0;
}
I built with:
cl /DUNICODE whatever.cpp user32.lib
Then I did a quick test that printed out exactly the text I'd typed into Notepad. To verify the result, I then edited the text in notepad, ran it again, and it printed out the modified text.
I have this BHO in C++ that I'm writing,
Basically what I'm trying to do is open a window, but it is not shown, I think it might have something to do with the HINSTANCE I passed to it. This is the code I use, anyone recognizing what's not right in this snippet?
Thanks :)
IServiceProvider* pServiceProvider = NULL;
if (SUCCEEDED(m_pWebBrowser->QueryInterface(
IID_IServiceProvider,
(void**)&pServiceProvider)))
{
IOleWindow* pWindow = NULL;
if (SUCCEEDED(pServiceProvider->QueryService(
SID_SShellBrowser,
IID_IOleWindow,
(void**)&pWindow)))
{
HWND hwndBrowser = NULL;
if (SUCCEEDED(pWindow->GetWindow(&hwndBrowser)))
{
HWND g_hwndMain;
g_hwndMain = CreateWindow(TEXT ("AnxJTest Class"),TEXT("My Window"),WS_POPUP | WS_VISIBLE,0, 0, 200, 300,NULL, NULL, (HINSTANCE)hwndBrowser, NULL);
ShowWindow(g_hwndMain, SW_SHOW);
}
pWindow->Release();
}
pServiceProvider->Release();
}
In MFC, is there an Open Folder Dialog? That is, rather than choosing a filename, it chooses a folder name? Ideally, I'd like it to be the way Visual Studio does it when navigating for a "Project Location" (when creating a new project), which looks very much like a normal file dialog. But I could make do with one of the vertical tree sort of interfaces if the former doesn't exist.
This code will get you a open folder dialog (this was taken from somewhere on the web but I don't really know where).
CString szSelectedFolder = _T("");
// This is the recommended way to select a directory
// in Win95 and NT4.
BROWSEINFO bi;
memset((LPVOID)&bi, 0, sizeof(bi));
TCHAR szDisplayName[_MAX_PATH];
szDisplayName[0] = '\0';
bi.hwndOwner = GetSafeHwnd();
bi.pidlRoot = NULL;
bi.pszDisplayName = szDisplayName;
bi.lpszTitle = _T("Select a folder");
bi.ulFlags = BIF_RETURNONLYFSDIRS;
// Set the callback function
bi.lpfn = BrowseCallbackProc;
LPITEMIDLIST pIIL = ::SHBrowseForFolder(&bi);
TCHAR szReturnedDir[_MAX_PATH];
BOOL bRet = ::SHGetPathFromIDList(pIIL, (TCHAR*)&szReturnedDir);
if (bRet)
{
if (szReturnedDir != _T(""))
{
szSelectedFolder = szReturnedDir;
}
LPMALLOC pMalloc;
HRESULT HR = SHGetMalloc(&pMalloc);
pMalloc->Free(pIIL);
pMalloc->Release();
}
you'll also have to implement this callback function:
TCHAR szInitialDir[_MAX_PATH];
// Set the initial path of the folder browser
int CALLBACK BrowseCallbackProc(HWND hWnd, UINT uMsg, LPARAM lParam, LPARAM lpData)
{
// Look for BFFM_INITIALIZED
if (uMsg == BFFM_INITIALIZED)
{
SendMessage(hWnd, BFFM_SETSELECTION, TRUE, (LPARAM)szInitialDir);
}
return 0;
}