PostMessage LPARAM trouble

I am trying to send a keystroke to another window via PostMessage. I can successfully run WM_KEYDOWN without my program crashing, but the other 3 messages fail.

As of now I'm sending 'a' to the other program. (0x00021e0*)

Code:

#define SETBITS(var,mask)   (var |= mask)
#define CLEARBITS(var,mask) (var &= ~mask)
#define CHKBITS(var,mask)   ((var&mask) == mask)

...

void SendKey(char input)
{
	LPARAM lParam;
	short key = VkKeyScan(input);
	UINT scancode = MapVirtualKey(key, 0);
	SETBITS(lParam,0x00021e00);
	PostMessage(lWnd, WM_KEYDOWN, key, lParam);
	Sleep(10);
	SETBITS(lParam,0x00021e02);
	PostMessage(lWnd, WM_CHAR, key, lParam);
	Sleep(10);
	SETBITS(lParam,0x00021e03);
	PostMessage(lWnd, WM_KEYUP, key, lParam);
	Sleep(10);
}

I created 0x00021e0* from the API documentation, but like I said the last 3 are failing.

Code:

29
    Specifies the context code. The value is 1 if the ALT key is held down while the key is pressed; otherwise, the value is 0.
30
    Specifies the previous key state. The value is 1 if the key is down before the message is sent, or it is 0 if the key is up.
31
    Specifies the transition state. The value is 1 if the key is being released, or it is 0 if the key is being pressed.

So the first PostMessage() is obviously 0000. The second one that is not working is 0010, and the third is 0011.

Help?

> SETBITS(lParam,0x00021e00);
How about a nice simple
lParam = 0x00021e00;

That works too! I'm new to bit manipulation so I thought everything had to be or'ed to be set. that's why my macro or's the mask. But unfortunately it still crashes, so I'm guessing it's still the lparam.


EDIT: I found the solution...lparam doesn't really matter at all either >_>. I forgot to initialize scancode = 0x0; My program now doesn't crash!