如何使用sendmessage更新datetimepicker

本文介绍了如何使用sendmessage更新datetimepicker的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 限时删除！！ 我正在尝试编写一个程序，使用SendMessage将信息发送到第三方程序。到目前为止，我已经成功使用了组合框和文本框，但是在更新DateTimePicker控件时遇到了困境。 使用SendMessage时对于DateTimePicker，它似乎不会更改日期/数据。有没有其他人遇到这个问题？ 我确实希望你知道我已经在这方面工作了几天而且我用各种方式用Google搜索我知道怎么但没有拿出来一个办法。基本上，我打电话给： 我尝试了什么： 声明 功能 SendMessage Lib user32.dll 别名 SendMessageA（ ByRef hwnd As Int32 ， ByRef wMsg 作为 Int32 ， ByRef wParam 作为 Int32 ， ByRef lParam 正如 SYSTEMTIME） As Int32 < StructLayout（LayoutKind.Sequential）> 结构 SYSTEMTIME 公共 wYear As Int16 公共 wMonth As Int16 公开 wDayOfWeek As Int16 公开 wDay As Int16 公开 wHour As Int16 公共 wMinute As Int16 公共 wSecond As Int16 公开 wMilliseconds 作为 Int16 结束 结构 公共 Const DTM_FIRST As Int32 =& H1000 公开 Const DTM_GETSYSTEMTIME As Int32 =（DTM_FIRST + 1 ） 公共 Const DTM_SETSYSTEMTIME 作为 Int32 =（DTM_FIRST + 2 ） 公开 共享 Sub SendMessageDateToControl（ControlHandle As 整数，消息作为 日期 ） Dim hwnd，datehwnd As 整数 Dim gettime 作为 新 SYSTEMTIME Dim changetime 作为 新 SYSTEMTIME changetime.wDay = Message.Day changetime.wMonth = Message.Month changetime.wYear = Message.Year SendMessage（ControlHandle， DTM_GETSYSTEMTIME， 0 ，gettime） SendMess age（ControlHandle，DTM_SETSYSTEMTIME， 0 ，更改时间） 结束 Sub 公开 共享 功能 GetChildWindows（ ByVal ParentHandle As IntPtr ） As IntPtr （） Dim ChildrenList As 新列表（ IntPtr ） Dim ListHandle As GCHandle = GCHandle.Alloc（ChildrenList） 尝试 EnumChildWindows（ ParentHandle， AddressOf EnumWindow，GCHandle.ToIntPtr（ListHandle）） 最后 如果 ListHandle.IsAllocated 那么 ListHandle.Free（） 结束 尝试 返回 ChildrenList.ToArray 结束 功能 公开 共享 功能 GetWindowHandle（WindowCaption As 字符串） 整数 返回 FindWindow（ Nothing ，WindowCaption） 结束 功能 私有 Sub GetControlInfo（） ' 获取窗口句柄 Dim hWnd = WindowControlHandleInfo.GetWindowHandle（TextBoxWindowName.Text） 如果（hWnd = 0 ）那么 MessageBox.Show（ 找不到控制窗口，Application.ProductName， MessageBoxButtons.OK，MessageBoxIcon.Information） 返回 结束 如果 ' 获取表单子项的所有控制句柄 Dim rtnChildWindows As IntPtr （）= WindowControlHandleInfo.GetChildWindows（hWnd） 如果 rtnChildWindows。长度= 0 然后 返回 ' 未找到任何控件 myControlInfo = 新列表（ WindowControlInfo） Dim zOrder As 整数 = 0 ' 遍历每个子窗口并将其添加到myControlInfo 对于 每个 i As 整数 在 rtnChildWindows ' 获取类名 Dim strClassName 作为 字符串 = CStr （WindowControlHandleInfo.GetClassName（i）） ' 获取控件标题 Dim ControlText As String = WindowControlHandleInfo.GetMesasgeFromControl（i） myControlInfo.Add（ New WindowControlInfo（strClassName，zOrder，i ，ControlText）） zOrder + = 1 下一页 结束 Sub 私有 Sub ButtonSendDateToDateTimePicker_Click（发件人 As 对象，e As EventArgs）句柄 ButtonSendDateToDateTimePicker.Click WindowControlHandleInfo .SendMessageDateToControl（TextBoxHandelDateTimePicker.Text， 02/01/1991） 结束 Sub 我也尝试过： 公共 声明 功能 SendMessage Lib user32.dll 别名 SendMessageA（ ByVal hwnd As Int32 ， ByVal wMsg 作为 Int32 ， ByVal wParam 作为 Int32 ， ByVal lParam As String ） As Int32 Public Const WM_SETTEXT 作为 Int32 =& HC 公共 Const WM_GETTEXT As Int32 =& HD SendMessage（chwnd，WM_SETTEXT， 0 ， 02 / 01/1991） 两者都没有改变DateTimePicker的值。解决方案 公共 Const WM_GETTEXT As Int32 =& HD SendMessage（chwnd，WM_SETTEXT， 0 ， 02/01/1991） 假设上面有拼写错误，WM_SETTEXT的值为x0C。 这是一个错字。应该是 公共 Const WM_SETTEXT 作为 Int32 =& HC 我已更新原始问题 I am attempting to write a program that will send information to a third-party program using SendMessage. I have been successful so far with the Combo Boxes and Text Boxes, but I am running into a brick wall when it comes to updating a DateTimePicker control.When using SendMessage to a DateTimePicker, it does not appear to change the date/data whatsoever. Has anyone else run into this problem?I do want you to know that I have been working on this for a couple of days and I have Googled every way that I know how but have not come up with a solution. Basically, I call:What I have tried:Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" (ByRef hwnd As Int32, ByRef wMsg As Int32, ByRef wParam As Int32, ByRef lParam As SYSTEMTIME) As Int32 <StructLayout(LayoutKind.Sequential)> Structure SYSTEMTIME Public wYear As Int16 Public wMonth As Int16 Public wDayOfWeek As Int16 Public wDay As Int16 Public wHour As Int16 Public wMinute As Int16 Public wSecond As Int16 Public wMilliseconds As Int16 End Structure Public Const DTM_FIRST As Int32 = &H1000 Public Const DTM_GETSYSTEMTIME As Int32 = (DTM_FIRST + 1) Public Const DTM_SETSYSTEMTIME As Int32 = (DTM_FIRST + 2) Public Shared Sub SendMessageDateToControl(ControlHandle As Integer, Message As Date) Dim hwnd, datehwnd As Integer Dim gettime As New SYSTEMTIME Dim changetime As New SYSTEMTIME changetime.wDay = Message.Day changetime.wMonth = Message.Month changetime.wYear = Message.Year SendMessage(ControlHandle, DTM_GETSYSTEMTIME, 0, gettime) SendMessage(ControlHandle, DTM_SETSYSTEMTIME, 0, changetime) End Sub Public Shared Function GetChildWindows(ByVal ParentHandle As IntPtr) As IntPtr() Dim ChildrenList As New List(Of IntPtr) Dim ListHandle As GCHandle = GCHandle.Alloc(ChildrenList) Try EnumChildWindows(ParentHandle, AddressOf EnumWindow, GCHandle.ToIntPtr(ListHandle)) Finally If ListHandle.IsAllocated Then ListHandle.Free() End Try Return ChildrenList.ToArray End Function Public Shared Function GetWindowHandle(WindowCaption As String) As Integer Return FindWindow(Nothing, WindowCaption) End Function Private Sub GetControlInfo() ' Get a Window's Handle Dim hWnd = WindowControlHandleInfo.GetWindowHandle(TextBoxWindowName.Text) If (hWnd = 0) Then MessageBox.Show("Control Window Was Not Found", Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Information) Return End If ' Get all the Control Handles for the Forms Child Dim rtnChildWindows As IntPtr() = WindowControlHandleInfo.GetChildWindows(hWnd) If rtnChildWindows.Length = 0 Then Return ' No Controls were Found myControlInfo = New List(Of WindowControlInfo) Dim zOrder As Integer = 0 ' Loop Through Each Child Window and add it to the myControlInfo For Each i As Integer In rtnChildWindows ' Get the Class Name Dim strClassName As String = CStr(WindowControlHandleInfo.GetClassName(i)) ' Get the Controls Caption Dim ControlText As String = WindowControlHandleInfo.GetMesasgeFromControl(i) myControlInfo.Add(New WindowControlInfo(strClassName, zOrder, i, ControlText)) zOrder += 1 Next End Sub Private Sub ButtonSendDateToDateTimePicker_Click(sender As Object, e As EventArgs) Handles ButtonSendDateToDateTimePicker.Click WindowControlHandleInfo.SendMessageDateToControl(TextBoxHandelDateTimePicker.Text, "02/01/1991") End SubI have also tried: Public Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" (ByVal hwnd As Int32, ByVal wMsg As Int32, ByVal wParam As Int32, ByVal lParam As String) As Int32Public Const WM_SETTEXT As Int32 = &HCPublic Const WM_GETTEXT As Int32 = &HDSendMessage(chwnd, WM_SETTEXT, 0, "02/01/1991")Neither is changing the value of the DateTimePicker. 解决方案 Public Const WM_GETTEXT As Int32 = &HDSendMessage(chwnd, WM_SETTEXT, 0, "02/01/1991")Assuming there is a typo in the above, WM_SETTEXT has the value x0C.That is a typo. It should have beenPublic Const WM_SETTEXT As Int32 = &HCI have updated my original question 这篇关于如何使用sendmessage更新datetimepicker的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 1403页，肝出来的..