How to get the last windows active time by windows api

winapi

In general, the Screensaver will run when we do nothing for a period of time.
Now i wanna know how to get the unactive time.
In another word,i want to make a program which would run a function if we do nothing for a period of time.
Now i can use mouse or keyboard hook to solve the problem.
But you know,it needs administrator permissions. In another word,if in win vista or win 7,it is nauseating because of the UAC.
I need an API such to get last windows active time.

Best Answer

The CallNtPowerInformation() API is to get the last power information
I should use GetLastInputInfo()

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C++ – global low level keyboard hook being called when SendInput is made. how to prevent it

If I understood your problem correctly, you should ignore "injected" key events
in your hook procedure like this:

LRESULT CALLBACK
hook_proc( int code, WPARAM wParam, LPARAM lParam )
{
  KBDLLHOOKSTRUCT*  kbd = (KBDLLHOOKSTRUCT*)lParam;

  // Ignore injected events
  if (code < 0 || (kbd->flags & 0x10)) {
    return CallNextHookEx(kbdhook, code, wParam, lParam);
  }
  ...

Update: additionally you have to eat characters and notify some other routine
for a character press through Windows messages.

Example:

...
// Pseudocode
if (kbd->vkCode is character) {
  if (WM_KEYDOWN == wParam) {
    PostMessage(mainwnd, WM_MY_KEYDOWN, kbd->vkCode, 0);
    return 1; // eat the char, ie 'a'
  }
}
return CallNextHookEx(kbdhook, code, wParam, lParam);

And in some other module you handle WM_MY_KEYDOWN

ie, #define WM_MY_KEYDOWN (WM_USER + 1)

and call the appropriate routine that will generate new key events.

Best Answer

Related Solutions

C++ – global low level keyboard hook being called when SendInput is made. how to prevent it

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