1.在Resource.h中添加自定义消息
#define WM_COMBOBOX_TEXT_CHANGED WM_USER + 100
2.在test.h中声明消息处理函数
afx_msg LRESULT OnComboBoxTextChanged(WPARAM wParam, LPARAM lParam);
3.在test.cpp中添加消息映射处理
ON_MESSAGE(WM_COMBOBOX_TEXT_CHANGED, &CFileDownload::OnComboBoxTextChanged)
4.在test.cpp中实现自定义消息处理
LRESULT CFileDownload::OnComboBoxTextChanged(WPARAM wParam, LPARAM lParam)
{
m_cbTest.SetWindowText("test");
return 0;
}
5.在CBN_SELCHANGE的消息映射函数中，发送消息WM_COMBOBOX_TEXT_CHANGED
void CFileDownload::OnCbnSelchangeComboTest()
{
PostMessage(WM_COMBOBOX_TEXT_CHANGED, 0, 0);
}