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Intercepting the Open button
#include <windows.h>
#include <shobjidl.h>
#include <stdio.h>
void test_ifiledialog()
{
HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED |
COINIT_DISABLE_OLE1DDE);
if (SUCCEEDED(hr))
{
IFileOpenDialog *pFileOpen;
// Create the FileOpenDialog object.
hr = CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_ALL,
IID_IFileOpenDialog, reinterpret_cast<void**>(&pFileOpen));
if (SUCCEEDED(hr))
{
// Show the Open dialog box.
hr = pFileOpen->Show(NULL);
// Get the file name from the dialog box.
if (SUCCEEDED(hr))
{
IShellItem *pItem;
hr = pFileOpen->GetResult(&pItem);
if (SUCCEEDED(hr))
{
PWSTR pszFilePath;
hr = pItem->GetDisplayName(SIGDN_FILESYSPATH, &pszFilePath);
// Display the file name to the user.
if (SUCCEEDED(hr))
{
wprintf(L"File Path: %ls\n", pszFilePath);
CoTaskMemFree(pszFilePath);
}
pItem->Release();
}
}
pFileOpen->Release();
}
CoUninitialize();
}
}
HWND hDialog;
LRESULT CALLBACK CallWndProc(int code, WPARAM wParam, LPARAM lParam)
{
PCWPSTRUCT data = (PCWPSTRUCT)lParam;
if (data->hwnd == hDialog && /* Open file dialog */
data->message == WM_COMMAND &&
data->wParam == 1 && /* Clicked */
data->lParam == (LPARAM)GetDlgItem(hDialog, 1)) /* Open button */
{
printf("CallWndProc thread id: %x\n", GetCurrentThreadId());
// User clicked the Open button, pressed enter, or used the keyboard shortcut.
char text[2048];
UINT rv = GetDlgItemText(hDialog, 1148, text, 2047);
if (rv > 0)
{
if (strstr(text, "://"))
{
// User has inputted a filename that looks like a URI.
// Wipe the text box before a DNS proxy bypass occurs.
SetDlgItemText(hDialog, 1148, "");
data->message = 0;
data->wParam = 0;
data->lParam = 0;
MessageBox(hDialog, "URIs are not permitted.", "Illegal file name", MB_OK);
}
}
}
return CallNextHookEx(0, code, wParam, lParam);
}
HHOOK hWndProcHook;
VOID CALLBACK WinEventProcCallback(HWINEVENTHOOK hWinEventHook,
DWORD dwEvent, HWND hwnd, LONG idObject, LONG idChild, DWORD dwEventThread, DWORD dwmsEventTime)
{
if (idObject == OBJID_WINDOW && dwEvent == EVENT_OBJECT_CREATE)
{
if (IsWindow(hwnd) && GetDlgCtrlID(hwnd) == 1148)
{
// We have the file dialog's filename text field.
printf("WinEventProcCallback thread id: %x\n", GetCurrentThreadId());
hDialog = GetParent(hwnd);
DWORD threadID = GetWindowThreadProcessId(hDialog, NULL);
// Hook messages to the file dialog.
hWndProcHook = SetWindowsHookEx(WH_CALLWNDPROC, CallWndProc, NULL, threadID);
}
}
}
HWINEVENTHOOK test_wineventhook()
{
// Hook creation of the Open File Dialog.
return SetWinEventHook(
EVENT_OBJECT_CREATE, EVENT_OBJECT_CREATE,
NULL, WinEventProcCallback, GetCurrentProcessId(), 0,
WINEVENT_OUTOFCONTEXT);
}
int main()
{
printf("main thread id: %x\n", GetCurrentThreadId());
HWINEVENTHOOK hHook = test_wineventhook();
test_ifiledialog();
UnhookWinEvent(hHook);
UnhookWindowsHookEx(hWndProcHook);
system("pause");
return 0;
}
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