Question

我需要在Delphi中模拟按多媒体键（如播放/暂停，上一首/下一首曲目，快退/前进等）。我可以使用下一个代码轻松模拟“普通”键：

keybd_event(VK_SPACE,0, 0, 0);
keybd_event(VK_SPACE,0, KEYEVENTF_KEYUP, 0);

另外，我找到了MAKE / BREAK代码列表，但我该怎么办？

MSDN说：

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.

我找到了Volume Up的扫描码：

制作代码：E0,32 中断代码：E0，F0,32

我试过了：

keybd_event(0,$32, KEYEVENTF_EXTENDEDKEY, 0);
keybd_event(0,$32, KEYEVENTF_EXTENDEDKEY or KEYEVENTF_KEYUP, 0);

但也没有运气（这必须模拟E0 32 E0 32，没有F0）。 MSDN也说bVk必须是[1..254]，我用了0，因为我没找到任何合适的密钥代码列表。

Answer 1

在Delphi XE3中它适用于我：

keybd_event(VK_VOLUME_UP {$AF},0, 0, 0);
keybd_event(VK_VOLUME_UP,0, KEYEVENTF_KEYUP, 0);

如果未在Delphi版本中声明这些常量，请查看the table here

在Delphi中模拟多媒体按键

1 个答案: