DialogBox show nothing

I've got this slice code inside a DLL:

Code:

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DWORD processId;
HWND hwndParent;
BOOL CALLBACK enumWindowsProc(HWND hwnd, LPARAM lParam)
{
        DWORD procid;
        GetWindowThreadProcessId(hwnd, &procid);
        if (procid == processId)
        {
                hwndParent = hwnd;
                return FALSE;
        }
        return TRUE;
}

const char* InputBox(LPCSTR title, const char* message, const char* def_value)
{
        HWND hwnd;
        MSG msg;
        processId = GetCurrentProcessId();
        EnumWindows(enumWindowsProc, 0);
        int ret = DialogBox(GetModuleHandle(NULL), MAKEINTRESOURCE(IDD_IB), hwndParent, InputBox_WndProc);

        return "0";
}

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Why id doesn't show any Dialog?

Thanks a lot.

The best way is to do as they say here http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx i.e. call GetLastError.

Quote:

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Originally Posted by anrapas

I've got this slice code inside a DLL:

Code:

---

...
        EnumWindows(enumWindowsProc, 0);
        int ret = DialogBox(GetModuleHandle(NULL), MAKEINTRESOURCE(IDD_IB), hwndParent, InputBox_WndProc);

---

Why id doesn't show any Dialog?

---

Why should it show anything?

1. Does IDD_IB template exist?
2. What is hwndParent? Is it a valid handle?
3. What is InputBox_WndProc?

You have to debug your code to be sure all the parameters passed in the DialogBox(...) are valid!
And of course you have to use GetLastError (as S_M_A already mentioned) to obtain the extended error information if some error happened.

I've found the error.

I use to call the DialogBox function with GetModuleHandle(NULL) instead of DLL HINSTANCE value (provided as first parameter at APIENTRY DllMain function).

Thanks a lot.