How can I get EnumWindows to list all windows?

It's (as I assumed) not a problem with EnumWindows at all. The problem is with the output stream.

While debugging, I noticed that enumWindowsProc is called just fine for every window, but that some iterations are simply not generating output.

For the time being, I switched to using _tprintf, but I don't understand what the problem with the original code is. Calling wcout.flush() had no desirable effect either.

Well, wcout.flush() never works, however wcout.clear() fixes your code, at least for me.

wcout << hWnd << TEXT( ": " ) << windowTitle << std::endl;
wcout.clear();
return TRUE;

And I know that this question is already one year old, however it's never too late to answer.

Here is a callback function that lists all open windows:

#include <string>
#include <iostream>
#include <Windows.h>

static BOOL CALLBACK enumWindowCallback(HWND hWnd, LPARAM lparam) {
    int length = GetWindowTextLength(hWnd);
    char* buffer = new char[length + 1];
    GetWindowText(hWnd, buffer, length + 1);
    std::string windowTitle(buffer);

    // List visible windows with a non-empty title
    if (IsWindowVisible(hWnd) && length != 0) {
        std::cout << hWnd << ":  " << windowTitle << std::endl;
    }
    return TRUE;
}

int main() {
    std::cout << "Enmumerating windows..." << std::endl;
    EnumWindows(enumWindowCallback, NULL);
    std::cin.ignore();
    return 0;
}

If you want to check if the window is minimized, you can use IsIconic().

See Also:

• Microsoft: EnumWindows function
• Stack Overflow: Getting a list of all open windows in c++ and storing them