要让VB.net相应外部托拽来的文件,需处理WM_DROPFILES消息。
Private Declare Sub DragAcceptFiles Lib "shell32.dll" (ByVal hWnd As Int32, ByVal fAccept As Int32) Private Declare Sub DragFinish Lib "shell32.dll" (ByVal hDrop As Int32) Private Declare Function DragQueryFile Lib "shell32.dll" Alias "DragQueryFileA" (ByVal hDrop As Int32, ByVal UINT As Int32, ByVal lpStr As
String, ByVal ch As Int32) As Int32
Private Const WM_DROPFILES = &H233 Private Const MAX_LENGTH = 255
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message) If m.Msg = WM_DROPFILES Then DragFiles(m.WParam.ToInt32) Exit Sub End If MyBase.WndProc(m) End Sub
Private Sub DragFiles(ByVal hDrop As Int32) Dim iReturn As Int32 Dim sFile As String sFile = Space(MAX_LENGTH) iReturn = DragQueryFile(hDrop, 0, sFile, MAX_LENGTH) If iReturn Then TextBox3.Text = sFile PictureBox1.Image = Image.FromFile(Trim(TextBox3.Text)) DragFinish(hDrop) End If End Sub
我的代码只是适用于.Net的PictureBox能用的图像文件噢! 
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