进程之间使用共享内存通信....

AKULAKK

于 2010-04-27 10:33:00 发布

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分类专栏： .NET 文章标签： textbox file string dst

本文链接：https://blog.youkuaiyun.com/kkun/article/details/5532925

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本文介绍了一个使用C#实现内存映射文件的基本示例。通过创建和映射内存文件来实现数据的写入与读取过程，具体包括CreateFileMapping、MapViewOfFile和memcpy等API函数的应用。

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[DllImport( "ntdll.dll ", CharSet = CharSet.Auto)]
public static extern IntPtr memcpy(
IntPtr dst,
string src,
int count);

......

写:

IntPtr memFileHandle = CreateFileMapping(INVALID_HANDLE_VALUE, IntPtr.Zero, PAGE_READWRITE, 0, (uint)1024, "mWeightData1 ");
if (memFileHandle == IntPtr.Zero)
{
MessageBox.Show( "建立共享失败 ");
}
else
{
///IntPtr h_pmw = MapViewOfFile(memFileHandle, FILE_MAP_WRITE, 0, 0, (uint)100);
IntPtr h_pmw = MapViewOfFile(memFileHandle, FILE_MAP_WRITE, 0, 0, 0);
int s = Marshal.SizeOf(mwd);
if (h_pmw == IntPtr.Zero)
{
MessageBox.Show( "建立映射失败 ");
}
else
{

memcpy(h_pmw,textBox1.Text, textBox1.Text.Length*2);

}
}

.......

读:

IntPtr mMapHandle = OpenFileMapping( FILE_MAP_READ,false, "mWeightData1 ");
if(mMapHandle == IntPtr.Zero)
{
MessageBox.Show( "打开共享失败,请确认服务已启动 ");
}

else
{
WeightData mrw = new WeightData();
IntPtr h_rw = MapViewOfFile(mMapHandle,FILE_MAP_READ,0,0,0);//(uint)100

textBox2.Text =(string) Marshal.PtrToStringAuto(h_rw);//PtrToStringAnsi(h_rw,256);

}