VC++实现内存共享（两个EXE通过内存共享传递信息通信）
共享内存通信演示vc6.0 c++
演示步骤：
1. 启动smserver
2. <创建共享内存>
3. 启动smclient
4. 在smserver中，输入要写入的内容，然后点击“写入数据”
5. 在smclient可以看到smserver中写入的数据
smserver端可以反复写入数据，则在smclient端会可见随着改变
此演示非常简单，只是演示如何使用，没有考虑性能、方式等，如果需要拿到真正的代码中使用，则需要考虑其它额外的工作，比如方式、效率等
创建内存void CSmserverDlg::OnBtnopensm()
{
// TODO: Add your control notification handler code here
if ( m_hShareMem == NULL )
{
SECURITY_ATTRIBUTES sa;
memset( &sa, 0, sizeof(sa) );
sa.nLength = sizeof(sa);
m_hShareMem = CreateFileMapping( (HANDLE)0xFFFFFFFF, &sa, PAGE_READWRITE, 0, m_dwSMLen, TEXT("rm_test_share_memory_trans_20100601") );
if ( m_hShareMem == NULL )
{
m_StStatus.SetWindowText( TEXT("创建共享内存失败！") );
}
else
{
m_lpVoidSM = MapViewOfFile( m_hShareMem, FILE_MAP_ALL_ACCESS, 0, 0, 0 );
if ( m_lpVoidSM == NULL )
{
CString strErr;
strErr.Format( TEXT("创建共享内存地址失败！error = %d"), GetLastError() );
m_StStatus.SetWindowText( strErr );
CloseHandle( m_hShareMem );
m_hShareMem = NULL;
}
else
{
m_StStatus.SetWindowText( TEXT("创建共享内存成功---") );
// 清空第一个字节
memcpy( m_lpVoidSM, TEXT("\0"), 1 );
}
}
}
}
写入数据
void CSmserverDlg::OnBtnwrite()
{
// TODO: Add your control notification handler code here
if ( m_lpVoidSM == NULL )
{
AfxMessageBox( TEXT("先创建共享内存!"), MB_ICONSTOP );
return;
}
CString strText;
m_EdWrite.GetWindowText( strText );
if ( strText.GetLength() == 0 )
{
AfxMessageBox( TEXT("必需输入要写入的内容!"), MB_ICONSTOP );
return;
}
strcpy( (char*)m_lpVoidSM, strText.GetBuffer(0) );
}
另一个EXE-读取数据。。。如下
void CSmclientDlg::OnBtnopensm()
{
// TODO: Add your control notification handler code here
if ( m_hShareMem == NULL )
{
SECURITY_ATTRIBUTES sa;
memset( &sa, 0, sizeof(sa) );
sa.nLength = sizeof(sa);
m_hShareMem = CreateFileMapping( (HANDLE)0xFFFFFFFF, &sa, PAGE_READWRITE, 0, m_dwSMLen, TEXT("rm_test_share_memory_trans_20100601") );
if ( m_hShareMem == NULL )
{
AfxMessageBox( TEXT("打开共享内存失败！"), MB_ICONSTOP );
}
else
{
m_lpVoidSM = MapViewOfFile( m_hShareMem, FILE_MAP_ALL_ACCESS, 0, 0, 0 );
if ( m_lpVoidSM == NULL )
{
AfxMessageBox( TEXT("打开共享内存地址失败！"), MB_ICONSTOP );
CloseHandle( m_hShareMem );
m_hShareMem = NULL;
}
else
{
SetTimer( 1, 100, NULL );
m_BtnOpenSM.SetWindowText( TEXT("正在监视...") );
m_BtnOpenSM.EnableWindow( FALSE );
}
}
}
}
void CSmclientDlg::OnTimer(UINT nIDEvent)
{
// TODO: Add your message handler code here and/or call default
if ( strlen((char*)m_lpVoidSM) > 0 )
{
m_StRead.SetWindowText( (char*)m_lpVoidSM );
memcpy( m_lpVoidSM, TEXT("\0"), 1 );
}
CDialog::OnTimer(nIDEvent);
}
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