MFC SendMessage()函数传递数据

比如：想使用其传递字符串

CString cstr1 = _T("123");
CString cstr2 = _T("hello");
::SendMessage(hWnd, WM_XXX, (WPARAM)(LPCTSTR)cstr1, (LPARAM)(LPCTSTR)cstr2);
 
1、.h头文件添加
#define WM_XXX (WM_USER+1001)
afx_msg LRESULT OnXXX(WPARAM wParam, LPARAM lParam);

2、.cpp文件中

// 加入映射宏
BEGIN_MESSAGE_MAP(CXXXDlg, CDialogEx)
...
ON_MESSAGE(WM_XXX, OnXXX)
...
END_MESSAGE_MAP()

//对应的消息处理函数体

LRESULT CXXXDlg::OnXXX(WPARAM wParam, LPARAM lParam)
{
// 在消息处理函数里接收字符串 
CString cstr1 = (LPCTSTR)wParam;
CString cstr2 = (LPCTSTR)lParam;
}