求助：VB调用SendMessage导致程序崩溃
我想用SendMessage跨进程获取文本框中的文字，之前我已经获得了正确的句柄。
源代码：

VB code

Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As LongConst WM_GetText As Long = 13Public Function subSendMyMsg(lngHwnd As Long) As String    On Error Resume Next1    Dim strWord As String2    strWord = String(255, Chr(0))3    Call SendMessage(lngHwnd, WM_GetText, 255, strWord)4    subSendMyMsg = Left(strWord, InStr(1, strWord, Chr(0)) - 1)End Function

其中lngHwnd为传入的句柄，WM_GetText已定义为13。
当程序运行到第4行时，如果是IDE调试则系统崩溃，如果是EXE则程序会崩溃退出。
求大家帮忙解决，谢谢！

[解决办法]
首先将你的On Error Resume Next 语句改为On Error GoTo 语句，再使用GetLastError捕获一下错误看看是什么错误？
[解决办法]
第三句修改为

VB code

Call SendMessage(lngHwnd, WM_GetText, 255, Byval strWord)
[解决办法]
http://bbs.bccn.net/thread-309935-1-9.html