keybd_event显示奇怪的行为

Question

I am trying to simulate enter key press using following code:

keybd_event(VK_RETURN , 0, 0, 0);
keybd_event(VK_RETURN , 0, KEYEVENTF_KEYUP, 0);

It works well in my 32 bit Windows XP OS but when I try in Windows 8 x64 machine, spacebar key press is simulated instead of enter key.

What should I do to get correct result?

I also tried using SendInput as shown below but i face the same problem.

void typeKey(short virtualKey)
{

 INPUT ip;
 ip.type = INPUT_KEYBOARD;
 ip.ki.wScan = 0; 
 ip.ki.time = 0;
 ip.ki.dwExtraInfo = 0;
 ip.ki.wVk = virtualKey; // virtual-key code for the character
 ip.ki.dwFlags = 0;
 SendInput(1, &ip, sizeof(INPUT));
 ip.ki.dwFlags = KEYEVENTF_KEYUP; // KEYEVENTF_KEYUP for key release
 SendInput(1, &ip, sizeof(INPUT));
}

//function call
typeKey(VK_RETURN);

Note: I am compiling a 32 bit executable on XP machine and using the same executable on Windows 8.

Answer 1

This is just an educated guess, but your old function uses argument types that differ in length from x86 to x64. That may be a problem. Listen to the documentation that says:

Note This function has been superseded. Use SendInput instead.

Answer 2

I confirm your observation on 64-bit Windows 8.1. For some reason, VK_RETURN does not work correctly with SendInput() .

The solution seems to be to supply the scan code as well like this:

ip.ki.wScan = MapVirtualKey(virtualKey, MAPVK_VK_TO_VSC);