在PostMessage中传递CString参数 [英] Passing CString argument in PostMessage

问题描述

如何将CString作为参数传递给PostMessage?再次如何将LPARAM/WPARAM转换回CString?救救我吧！

How to pass CString as argument to the PostMessage? and again how to convert LPARAM/WPARAM back to CString? Help me!

推荐答案

您不知道.
当您发布消息时，您不知道何时会收到该消息.您要传递的字符串已经超出范围后，可以接收它.
如果您要在同一过程中将消息发布到另一个窗口，请使用源/接收器惯用语(又名生产者/消费者):

You don''t.
When you post a message, you don''t know when it will be received. It can be received after the string you want to pass is already out of scope.
If you''re posting a message to another window in the same process, use the source/sink idiom (AKA producer/consumer):

void producer()
{
    wchar_t * wstring = new wchar_t[80];
    wcscpy(wstring, L"HELLO");
    ::PostMessage(HWND, MY_CUSTOM_MESSAGE, 0, (LPARAM) wstring);
    // DO NOT DELETE wstring;
}

class Consumer
{
    LRESULT On_MyCustomMessage(WPARAM /*notused*/, LPARAM lpWstring)
    {
        wchar_t *pString = (wchar_t *) lpWstring;
        // Do something with pString... You can even pass it to a CStringW constructor. 
        delete[] pString; // and don't forget this!
        return 0L;
    }   
};

如果您使用的是CString，请参见AllocSysString()成员函数. BSTR旨在传递.

希望这会有所帮助，
巴勃罗.

If you''re using CString, see the AllocSysString() member function. BSTRs are meant to be passed around.

Hope this helps,
Pablo.

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