Simulate multimedia key presses in Delphi
delphi, key, multimedia, scancodes, simulate
Solution
It works for me in Delphi XE3:
keybd_event(VK_VOLUME_UP {$AF},0, 0, 0);
keybd_event(VK_VOLUME_UP,0, KEYEVENTF_KEYUP, 0);
If these constants are not declared in your Delphi version, look at the table here
Problem
I need to simulate pressing of multimedia keys (such as play/pause, prev/next track, rewind/forward, etc.) in Delphi. I can simulate 'normal' keys easily using the next code: ``` keybd_event(VK_SPACE,0, 0, 0); keybd_event(VK_SPACE,0, KEYEVENTF_KEYUP, 0); ``` Also, I've found the lists of MAKE/BREAK codes, but what should I do with them? MSDN says: ``` VOID keybd_event( BYTE bVk, // virtual-key code BYTE bScan, // hardware scan code DWORD dwFlags, // flags specifying various function options DWORD dwExtraInfo // additional data associated with keystroke ); bVk - Specifies a virtual-key code. The code must be a value in the range 1 to 254. bScan - Specifies a hardware scan code for the key. dwFlags - A set of flag bits that specify various aspects of function operation. An application can use any combination of the following predefined constant values to set the flags: KEYEVENTF_EXTENDEDKEY - If specified, the scan code was preceded by a prefix byte having the value 0xE0 (224). KEYEVENTF_KEYUP If specified, the key is being released. If not specified, the key is being depressed. dwExtraInfo - Specifies an additional 32-bit value associated with the key stroke. ``` I've found the scan codes for Volume Up: Make Code: E0, 32 Break Code: E0, F0, 32 I tried: ``` keybd_event(0,$32, KEYEVENTF_EXTENDEDKEY, 0); keybd_event(0,$32, KEYEVENTF_EXTENDEDKEY or KEYEVENTF_KEYUP, 0); ``` but with no luck too (this must simulate E0 32 E0 32, without F0). Also MSDN says bVk must be [1..254], and I used 0 because I haven't found anything suitable in key codes list.