Why is SendMessage not working?

Question

C++ / C#

#include <iostream>
#include <Windows.h>
#include <chrono>
#include <thread>

static void action() {
  HWND main = FindWindow(NULL, L"clumsy 0.3");

  if (main == NULL) {
    printf("MAIN IS NULL\n");
    return;
  }

  HWND filt = FindWindowEx(main, 0, 0, L"Filtering");

  if (filt == NULL) {
    printf("FILT IS NULL\n");
    return;
  }

  HWND buttonHandle = FindWindowEx(filt, 0, L"Button", L"Start");

  if (buttonHandle == NULL) {
    printf("BUTTONHANDLE IS NULL\n");
    return;
  }
  
  printf("BUTTON IS PRESSING\n");


  SendMessage(buttonHandle, BN_CLICKED, 0, 0);

  printf("BUTTON IS PRESSED\n");
}

int main()
{
  bool lastKeyIsPressed = false;

  while (true)
  {
    Sleep(50);
    if ((GetKeyState(VK_LMENU) & 0x8000)) {
      if (!lastKeyIsPressed) {
        action();
        lastKeyIsPressed = true;
      }
    }
    else
    {
      lastKeyIsPressed = false;
    }
  }
    
}

no errors, just nothing happens

Answer 1

The problem was in administrator rights, if it doesn't work for you, try running the compiled exe as administrator. And yet, replace BN_CLICKED with BM_CLICK, I did not test BN_CLICKED with admin rights, maybe it will work too. I also want to clarify, if you suddenly cannot find the button in the window, perhaps the button is inside another control, in which case you will first need to get it, the exact hierarchy of objects can be viewed through spy ++

Answer 2

Try BM_CLICK , not BN_CLICKED