学徒送分贴！VK_SHIFT 判断shift是否按下（问题解决马上结贴）！！！

[hahuma]

case WM_KEYDOWN:
{
int virtual_key = (int)wparam;
int key_state = (int)lparam;

hdc = GetDC(hwnd);
SetTextColor(hdc,RGB(0,0,255));
SetBkColor(hdc,RGB(0,0,0));
SetBkMode(hdc,OPAQUE);

switch(virtual_key)
{
case VK_LEFT:
{

if(key_state == VK_SHIFT)
{
TextOut(hdc,30,140,"Run",strlen"Run"));

}else
TextOut(hdc,30,140,"Go",strlen("Go"));
}break;

各位大虾我是新手,用这个方法判断shift是否按下怎么不行呢?应该怎么弄呢?我这么做错在哪里呢？还请大家不吝赐教！谢谢！！

[hyamw]

用GetKeyState就可以了

[goodboyws]

GetKeyState(VK_SHIFT) & 0x8000

[hahuma]

谢谢两位，那我这么写的问题是什么呢？为什么判断不了呢？WM_KEYDOWN 的消息参数lparam在这里用不上么？

[hahuma]

刚开始接触vc，c++基础也不好很多概念还比较模糊， lparam 这个参数 不就是用来判断其他的特殊控制的么？ 应该怎么用呢？

[hyamw]

WM_KEYDOWN消息的lParam参数：

lParam
Specifies the repeat count, scan code, extended-key flag, context code, previous key-state flag, and transition-state flag, as shown in the following table.
0-15
Specifies the repeat count for the current message. The value is the number of times the keystroke is autorepeated as a result of the user holding down the key. If the keystroke is held long enough, multiple messages are sent. However, the repeat count is not cumulative.
16-23
Specifies the scan code. The value depends on the OEM.
24
Specifies whether the key is an extended key, such as the right-hand ALT and CTRL keys that appear on an enhanced 101- or 102-key keyboard. The value is 1 if it is an extended key; otherwise, it is 0.
25-28
Reserved; do not use.
29
Specifies the context code. The value is always 0 for a WM_KEYDOWN message.
30
Specifies the previous key state. The value is 1 if the key is down before the message is sent, or it is zero if the key is up.
31
Specifies the transition state. The value is always zero for a WM_KEYDOWN message.