这两个参数都是32位， WPARAM定义为UINT， LPARAM定义为LONG， 从字面上基本可以看出来的， 当然WPARAM可不是WORD呢， 这是16位WINDOWS遗留下来的坏点， 在不同的消息中这两个参数的意义会不同， 有时看多了， 就有糊涂之感， 不如总结下：（时常更新的）
WM_SIZE:
cxClient = LOWORD(LPARAM);
cyClient = HIWORD(LPARAM);
LPARAM
低16位代表客户窗口的宽度
高16位代表客户窗口的高度
WPARAM
没有特别的意义
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case WM_VSCROLL, WM_HSCROLL:
switch(LOWORD(WPARAM)) {
case SB_LINEUP:
case SB_LINEDOWN:
.
.
.
case SB_THUMBTRACK:
case SB_THUMBPOSITION:
iVscrollPos = HIWORD(WPARAM);
}
WPARAM
低16位代表滚动条消息
高16位代表在SB_THUMBTRACK和SB_THUMBPOSITION下滚动条目前的位置
LPARAM
目前还没有特别的意义
}
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WM_KEYDOWN
WPARAM：代表虚拟键，virtual-key code,
请参看：
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WM_CHAR
wParam
Specifies the character code of the key.
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.
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WM_LBUTTON
WPARAM
Parameters
wParam
Indicates whether various virtual keys are down. This parameter can be one or more of the following values.
MK_CONTROL
The CTRL key is down.
MK_LBUTTON
The left mouse button is down.
MK_MBUTTON
The middle mouse button is down.
MK_RBUTTON
The right mouse button is down.
MK_SHIFT
The SHIFT key is down.
MK_XBUTTON1
Windows 2000/XP: The first X button is down.
MK_XBUTTON2
Windows 2000/XP: The second X button is down.
lParam
The low-order word specifies the x-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area.
The high-order word specifies the y-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area.
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WM_LBUTTONUP
WPARAM wParam
LPARAM lParam;
Parameters
wParam
Indicates whether various virtual keys are down. This parameter can be one or more of the following values.
MK_CONTROL
The CTRL key is down.
MK_MBUTTON
The middle mouse button is down.
MK_RBUTTON
The right mouse button is down.
MK_SHIFT
The SHIFT key is down.
MK_XBUTTON1
Windows 2000/XP: The first X button is down.
MK_XBUTTON2
Windows 2000/XP: The second X button is down.
lParam
The low-order word specifies the x-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area.
The high-order word specifies the y-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area.
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WM_MOUSEMOVE
WPARAM wParam
LPARAM lParam;
Parameters
wParam
Indicates whether various virtual keys are down. This parameter can be one or more of the following values.
MK_CONTROL
The CTRL key is down.
MK_LBUTTON
The left mouse button is down.
MK_MBUTTON
The middle mouse button is down.
MK_RBUTTON
The right mouse button is down.
MK_SHIFT
The SHIFT key is down.
MK_XBUTTON1
Windows 2000/XP: The first X button is down.
MK_XBUTTON2
Windows 2000/XP: The second X button is down.
lParam
The low-order word specifies the x-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area.
The high-order word specifies the y-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area
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