WinApi:计算ListView高度
我有一个在细节模式下的VB6列表视图,显示X个项目数。我想创建某种自动高度函数,根据指定的宽度和项目数计算高度 以下代码不起作用:WinApi:计算ListView高度,winapi,listview,vb6,Winapi,Listview,Vb6,我有一个在细节模式下的VB6列表视图,显示X个项目数。我想创建某种自动高度函数,根据指定的宽度和项目数计算高度 以下代码不起作用: Public Declare Function MessageSend Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long Public Const LVM_FIRST As L
Public Declare Function MessageSend Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Public Const LVM_FIRST As Long = &H1000
Public Const LVM_APPROXIMATEVIEWRECT As Long = (LVM_FIRST + 64)
Public Sub GetAutoWidth(lvw as ListView)
result = MakeLPAram(-1, 0)
MessageSend lvw.hWnd, LVM_APPROXIMATEVIEWRECT, -1&, result
lvw.height = loWord(result) * Screen.TwipsPerPixelX
End Sub
Public Function LoWord(value As Long) As Long
LoWord = (value And &HFFFF&)
End Function
Public Function MakeLPAram(wLow As Long, wHigh As Long) As Long
MakeLPAram = MakeLong(wLow, wHigh)
End Function
Public Function MakeLong(wLow As Long, wHigh As Long) As Long
MakeLong = LoWord(wLow) Or (&H10000 * LoWord(wHigh))
End Function
有人能帮我吗?首先,您不在此处保存消息的返回值:
MessageSend lvw.hWnd, LVM_APPROXIMATEVIEWRECT, -1&, result
您应该这样做,因为返回值正是您首先发送消息的原因:
返回值
返回保留近似宽度的DWORD值(以低位表示)
以及显示项目所需的高度(在HIWORD中),以像素为单位
其次,您的命名(GetAutoWidth
)、问题标题(“计算ListView高度”)和代码(lvw.height=loWord(result)*Screen.twipperpixelx
)非常不一致
第三,请阅读以下MSDN文章,因为您的打包/解包单词代码和双字代码也有缺陷:
返回65535表示低位词,0表示高位词。请根据变量值重申您的评论。