VB.net SendMessage waiting problem
I am using the following code to click a button for displaying another form to click on:
Dim hwnd As Integer = FindWindow(vbNullString, "Virtual CDRom Control Panel")
Dim x As Integer = FindWindowEx(hwnd, 0, vbNullString, "Driver Control ...")
SendMessage(x, BM_CLICK, 0&, 0&)
Thread.Sleep(200)
hwnd = FindWindow(vbNullString, "Virtual CD-ROM Driver Control")
Debug.Print(hwnd)
Problems is that when it gets to
SendMessage(x, BM_CLICK, 0&, 0&)
to click the button, it stops the code there until i exit out of the box that pops up. I want to be able to continue without having to exit the box since the next line
hwnd = FindWindow(vbNullString, "Virtual CD-ROM Driver Control")
finds the pop up window and will click on a button inside that box.
Any help would be great! :o)
David
SOLVED
Private Declare Function FindWindow Lib "user32.dll" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
Private Declare Function FindWindowEx Lib "user32.dll" Alias "FindWindowE开发者_运维百科xA" (ByVal hWndParent As IntPtr, ByVal hWndChildAfter As Integer, ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
Private Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" (ByVal hWnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As IntPtr) As IntPtr
Private Declare Function PostMessage Lib "user32.dll" Alias "PostMessageA" (ByVal hwnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As IntPtr) As IntPtr
Dim hwnd As IntPtr = FindWindow(vbNullString, "Virtual CDRom Control Panel")
Dim x As IntPtr = FindWindowEx(hwnd, 0, vbNullString, "Driver Control ...")
PostMessage(x, BM_CLICK, 0&, 0&)
Thread.Sleep(200)
hwnd = FindWindow(vbNullString, "Virtual CD-ROM Driver Control")
Debug.Print(hwnd)
Try changing SendMessage
to PostMessage
.
Also please note all HWND
s must be declared as IntPtr
.
Also wParam
and lParam
for SendMessage
and PostMessage
are IntPtr
s.
This will make you code compatible with x64 environment.
精彩评论