Programmatically press a button on another application (C, Windows)

Question

I\'m trying to use the following code to press a button on my other application:

HWND ButtonHandle;
if( (wnd = FindWindow(0, \"Do you want to save?\")) )
{   
           


        

Answer 1

//Send digit 4 to the already opened calc.exe

HWND windowHandle;

windowHandle = FindWindowA(NULL,"Calculator");

if(windowHandle != 0)
   ret = EnumChildWindows(windowHandle,GetButtonHandle,0);

BOOL CALLBACK GetButtonHandle(HWND handle, LPARAM)
{
char label[100];
int size = GetWindowTextA(handle,label,sizeof(label));

if(strcmp(label,"4") == 0)
{
PostMessage(handle ,WM_LBUTTONDOWN,(WPARAM)0x0001,0);
PostMessage(handle ,WM_LBUTTONUP,(WPARAM)0x0001,0);

PostMessage(handle ,WM_LBUTTONDOWN,(WPARAM)0x0001,0);
PostMessage(handle ,WM_LBUTTONUP,(WPARAM)0x0001,0);

return false;
}
return true;
}