c++中 double mst_cost(const int&,const double*,const double*);语句是否正确？？

如题所述

lelistbox
模块：mst1

窗体代码：
Private Sub Dir1_Change()
File1.Path = Dir1.Path
End Sub
'加入一个DriveListBox，Name属性设置为Drive1，在Drive1的Change事件中加入如下
'代码:
Private Sub Drive1_Change()
Dir1.Path = Drive1.Drive
End Sub
'加入一个CommandButton，Name属性设置为cmdCopy，在cmdCopy的Click事件中加入如下
'代码:
Private Sub cmdCopy_Click()
Dim Files() As String
Dim Path As String
Dim i As Long, n As Long

Path = Dir1.Path
If Right(Path, 1) <> "\" Then
Path = Path & "\"
End If

'根据在List1上的选择建立拷贝文件的列表
With File1
For i = 0 To .ListCount - 1
If .Selected(i) Then
ReDim Preserve Files(0 To n) As String
Files(n) = Path & .List(i)
n = n + 1
End If
Next i
End With

'拷贝文件到Clipboard
If clipCopyFiles(Files) Then
MsgBox "拷贝文件成功.", , Success
Else
MsgBox "无法拷贝文件...", , Failure
End If
End Sub
'加入一个CommandButton，Name属性设置为cmdPaste，在cmdPaste的Click事件中加入如
'下代码:
Private Sub cmdPaste_Click()
Dim Files() As String
Dim nRet As Long
Dim i As Long
Dim msg As String

nRet = clipPasteFiles(Files)
If nRet Then
For i = 0 To nRet - 1
msg = msg & Files(i) & vbCrLf
Next i
MsgBox msg, , "共粘贴" & nRet & "个文件"
Else
MsgBox "从剪贴版粘贴文件错误", , Failure
End If
End Sub

' 运行文件，在Windows 资源管理器中，选择文件，再在资源管理器菜单中选 编辑 | 复制
'然后在Form1中点击cmdPaste，从资源管理器中复制的文件就拷贝到Dir1所在的目录中。从
'File1中选择文件，按cmdCopy复制，再在资源管理器中选 编辑 | 粘贴 ，选择的文件就被
'拷贝到Windows 资源管理器的当前目录下?
Private Sub Form_Load()

End Sub

模块代码：
'1、在工程文件中加入一个Module，然后在Module中加入如下代码：
Option Explicit

Private Type POINTAPI
x As Long
y As Long
End Type

Private Type SHFILEOPSTRUCT
hwnd As Long
wFunc As Long
pFrom As String
pTo As String
fFlags As Integer
fAnyOperationsAborted As Long
hNameMappings As Long
lpszProgressTitle As String
End Type

Private Declare Function SHFileOperation Lib "shell32.dll" Alias _
"SHFileOperationA" (lpFileOp As SHFILEOPSTRUCT) As Long

'剪贴版处理函数
Private Declare Function EmptyClipboard Lib "user32" () As Long
Private Declare Function OpenClipboard Lib "user32" (ByVal hwnd _
As Long) As Long
Private Declare Function CloseClipboard Lib "user32" () As Long
Private Declare Function SetClipboardData Lib "user32" (ByVal wFormat _
As Long, ByVal hMem As Long) As Long
Private Declare Function GetClipboardData Lib "user32" (ByVal wFormat _
As Long) As Long
Private Declare Function IsClipboardFormatAvailable Lib "user32" _
(ByVal wFormat As Long) As Long

Private Declare Function DragQueryFile Lib "shell32.dll" Alias _
"DragQueryFileA" (ByVal hDrop As Long, ByVal UINT As Long, _
ByVal lpStr As String, ByVal ch As Long) As Long
Private Declare Function DragQueryPoint Lib "shell32.dll" (ByVal _
hDrop As Long, lpPoint As POINTAPI) As Long
Private Declare Function GlobalAlloc Lib "kernel32" (ByVal wFlags _
As Long, ByVal dwBytes As Long) As Long
Private Declare Function GlobalFree Lib "kernel32" (ByVal hMem As _
Long) As Long
Private Declare Function GlobalLock Lib "kernel32" (ByVal hMem As _
Long) As Long
Private Declare Function GlobalUnlock Lib "kernel32" (ByVal hMem As _
Long) As Long
Private Declare Sub CopyMem Lib "kernel32" Alias "RtlMoveMemory" _
(Destination As Any, Source As Any, ByVal Length As Long)

'剪贴版数据格式定义
Private Const CF_TEXT = 1
Private Const CF_BITMAP = 2
Private Const CF_METAFILEPICT = 3
Private Const CF_SYLK = 4
Private Const CF_DIF = 5
Private Const CF_TIFF = 6
Private Const CF_OEMTEXT = 7
Private Const CF_DIB = 8
Private Const CF_PALETTE = 9
Private Const CF_PENDATA = 10
Private Const CF_RIFF = 11
Private Const CF_WAVE = 12
Private Const CF_UNICODETEXT = 13
Private Const CF_ENHMETAFILE = 14
Private Const CF_HDROP = 15
Private Const CF_LOCALE = 16
Private Const CF_MAX = 17

'内存操作定义
Private Const GMEM_FIXED = &H0
Private Const GMEM_MOVEABLE = &H2
Private Const GMEM_NOCOMPACT = &H10
Private Const GMEM_NODISCARD = &H20
Private Const GMEM_ZEROINIT = &H40
Private Const GMEM_MODIFY = &H80
Private Const GMEM_DISCARDABLE = &H100
Private Const GMEM_NOT_BANKED = &H1000
Private Const GMEM_SHARE = &H2000
Private Const GMEM_DDESHARE = &H2000
Private Const GMEM_NOTIFY = &H4000
Private Const GMEM_LOWER = GMEM_NOT_BANKED
Private Const GMEM_VALID_FLAGS = &H7F72
Private Const GMEM_INVALID_HANDLE = &H8000
Private Const GHND = (GMEM_MOVEABLE Or GMEM_ZEROINIT)
Private Const GPTR = (GMEM_FIXED Or GMEM_ZEROINIT)

Private Const FO_COPY = &H2

Private Type DROPFILES
pFiles As Long
pt As POINTAPI
fNC As Long
fWide As Long
End Type

Public Function clipCopyFiles(Files() As String) As Boolean
Dim data As String
Dim df As DROPFILES
Dim hGlobal As Long
Dim lpGlobal As Long
Dim i As Long

'清除剪贴版中现存的数据
If OpenClipboard(0&) Then
Call EmptyClipboard

For i = LBound(Files) To UBound(Files)
data = data & Files(i) & vbNullChar
Next i
data = data & vbNullChar

'为剪贴版拷贝操作分配相应大小的内存
hGlobal = GlobalAlloc(GHND, Len(df) + Len(data))
If hGlobal Then
lpGlobal = GlobalLock(hGlobal)

df.pFiles = Len(df)
'将DropFiles结构拷贝到内存中
Call CopyMem(ByVal lpGlobal, df, Len(df))
'将文件全路径名拷贝到分配的内存中?
Call CopyMem(ByVal (lpGlobal + Len(df)), ByVal data, _
Len(data))
Call GlobalUnlock(hGlobal)

'将数据拷贝到剪贴版上
If SetClipboardData(CF_HDROP, hGlobal) Then
clipCopyFiles = True
End If
End If
Call CloseClipboard
End If
End Function

Public Function clipPasteFiles(Files() As String) As Long
Dim hDrop As Long
Dim nFiles As Long
Dim i As Long
Dim desc As String
Dim filename As String
Dim pt As POINTAPI
Dim tfStr As SHFILEOPSTRUCT
Const MAX_PATH As Long = 260

'确定剪贴版的数据格式是文件，并打开剪贴版
If IsClipboardFormatAvailable(CF_HDROP) Then
If OpenClipboard(0&) Then
hDrop = GetClipboardData(CF_HDROP)
'获得文件数
nFiles = DragQueryFile(hDrop, -1&, , 0)

ReDim Files(0 To nFiles - 1) As String
filename = Space(MAX_PATH)

'确定执行的操作类型为拷贝操作
tfStr.wFunc = FO_COPY
'目的路径设置为File1指定的路径
tfStr.pTo = Form1.File1.Path

For i = 0 To nFiles - 1
'根据获取的每一个文件执行文件拷贝操作
Call DragQueryFile(hDrop, i, filename, Len(filename))
Files(i) = TrimNull(filename)
tfStr.pFrom = Files(i)
SHFileOperation tfStr
Next i
Form1.File1.Refresh
Form1.Dir1.Refresh

Call CloseClipboard
End If
clipPasteFiles = nFiles
End If
End Function

Private Function TrimNull(ByVal StrIn As String) As String
Dim nul As Long

nul = InStr(StrIn, vbNullChar)
Select Case nul
Case Is > 1
TrimNull = Left(StrIn, nul - 1)
Case 1
TrimNull =
Case 0
TrimNull = Trim(StrIn)
End Select
End Function

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