?? sendmessagecallback.htm
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<title>SendMessageCallback</title>
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<td width="100%" height="16">SendMessageCallback</td>
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<td width="100%" colspan="2">VB聲明</td>
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<td width="100%" colspan="2">Declare Function SendMessageCallback Lib "user32"
Alias "SendMessageCallbackA" (ByVal hwnd As Long, ByVal msg As Long, ByVal
wParam As Long, ByVal lParam As Long, ByVal lpResultCallBack As Long, ByVal dwData As
Long) As Long</td>
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<td width="100%" colspan="2">說明</td>
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<td width="100%" colspan="2">將一條消息發給窗口。該函數最大的特定是可以立即返回。目標窗口函數執行完畢后，會用回調函數的形式將結果返回</td>
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<td width="100%" colspan="2">返回值</td>
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<td width="100%" colspan="2">Long，TRUE表示成功，FALSE表示失敗。會設置<a
href="GetLastError.htm" tppabs="http://www.gxbcts.com/airfly/api/papi/GetLastError.htm">GetLastError</a></td>
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<td width="100%" colspan="2">參數表</td>
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<td width="25%">參數</td>
<td width="75%">類型及說明</td>
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<td width="25%">hwnd</td>
<td width="75%">Long，要接收消息的那個窗口的句柄</td>
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<td width="25%">msg</td>
<td width="75%">Long，消息的標識符</td>
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<td width="25%">wParam</td>
<td width="75%">Long，取決于消息</td>
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<td width="25%">lParam</td>
<td width="75%">Long，取決于消息</td>
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<td width="25%">lpResultCallBack</td>
<td width="75%">Long，指定函數地址。在vb5中可用AddressOf操作符獲得</td>
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<td width="25%">dwData</td>
<td width="75%">Long，用戶自定義值</td>
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<td width="100%" colspan="2">注解</td>
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<td width="100%" colspan="2"><p align="left">回調函數聲明如下：<br>
Public Function WndProc(ByVal hwnd&, ByVal msg&, ByVal wp&, ByVal lp&) As
Long<br>
其中，wp參數是作為dwData參數傳遞的值。lp參數包含了來自窗口函數的結果</td>
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<td width="100%"><p align="right">Top</td>
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