hALT! PostMessage Question

[Joey_k29]

Okay, I have one simple problem. I am trying to use PostMessage with wm_keydown. I want to be able to send the alt key. Please don't refer me to the msdn article. I do not know how to construct the parameter so that I can turn the 29 bit to 1. If someone can please give me the code that does this, I would be grateful. Go to http://msdn.microsoft.com/library/de...wm_keydown.asp for the article on wm_keydown. Thank you very much.

Joe

[CornedBee]

/* C-syntax */
#define SETBIT(num, bit) \
    ((num) |= (1 << (bit)))   // could also be bit - 1, not sure, try

#define RESETBIT(num, bit) \
    ((num) &= (^(1 << (bit))))   // could also be bit - 1, not sure, try


// C++ syntax
template<class T>
inline void SETBIT(T& num, int bit)
{
    num |= 1 << bit;    // same here
}

template<class T>
inline void RESETBIT(T& num, int bit)
{
    num &= ^(1 << bit);    // same here
}

That should work.

[Joey_k29]

what does the actual Postmessage look like??? I am not very well acquainted with c++ so I am not sure what that code means. How would I make the call? Thank you for the help.

Joe

[CornedBee]

You would declare a LPARAM variable, set the things you want, set bit 29 by using my functions/macros and then do a PostMessage supplying the LPARAM as parameter:

int vKey = VK_A;
LPARAM lParam = repCount; // the amount of key repeats that occurred until this message was retrieved
lParam |= (scanCode << 16);  // the keyboard scan code. Most apps don't care about this, so you can set it to 0
SETBIT(lParam, 29);  // alt is pressed
RESETBIT(lParam, 30); // the key was not already pressed before this message was sent
RESETBIT(lParam, 31); // the key is pressed, not released

PostMessage(hwndDestination, WM_KEYDOWN, (WPARAM)vKey, lParam);