C#根据进程名称获取进程的句柄？

C#根据进程名称获取进程的句柄或C#如何获取其他进程的句柄？

有时候标题名是动态变化的，所以不使用FindWindow方法！

[StructLayout(LayoutKind.Sequential)]

public struct ProcessEntry32

{

public uint dwSize;

public uint cntUsage;

public uint th32ProcessID;

public IntPtr th32DefaultHeapID;

public uint th32ModuleID;

public uint cntThreads;

public uint th32ParentProcessID;

public int pcPriClassBase;

public uint dwFlags;

[MarshalAs(UnmanagedType.ByValTStr,SizeConst=260)]

public string szExeFile;

}

[DllImport("KERNEL32.DLL ")]

public static extern IntPtr CreateToolhelp32Snapshot(uint flags,uint processid);

[DllImport("KERNEL32.DLL ")]

public static extern int CloseHandle(IntPtr handle);

[DllImport("KERNEL32.DLL ")]

public static extern int Process32First(IntPtr handle,ref ProcessEntry32 pe);

[DllImport("KERNEL32.DLL ")]

public static extern int Process32Next(IntPtr handle,ref ProcessEntry32 pe);

[DllImport("User32.dll",EntryPoint="SendMessage")]

private static extern int SendMessage(int hWnd,int Msg,int wParam,string lParam);

public IntPtr GetHandleByProcessName(string ProcessName)

{

List<ProcessEntry32> list=new List<ProcessEntry32>();

IntPtr handle=CreateToolhelp32Snapshot(0x2,0);

IntPtr hh=IntPtr.Zero;

if((int)handle>0)

{

ProcessEntry32 pe32=new ProcessEntry32();

pe32.dwSize=(uint)Marshal.SizeOf(pe32);

int bMore=Process32First(handle,ref pe32);

while(bMore==1)

{

IntPtr temp=Marshal.AllocHGlobal((int)pe32.dwSize);

Marshal.StructureToPtr(pe32,temp,true);

ProcessEntry32 pe=(ProcessEntry32)Marshal.PtrToStructure(temp,typeof(ProcessEntry32));

Marshal.FreeHGlobal(temp);

list.Add(pe);

if(pe.szExeFile==ProcessName)

{

bMore=2;

hh=GetCurrentWindowHandle(pe.th32ProcessID);

break;

}

bMore=Process32Next(handle,ref pe32);

}

}

return hh;

}

public static IntPtr GetCurrentWindowHandle(uint proid)

{

IntPtr ptrWnd=IntPtr.Zero;

uint uiPid=proid;

object objWnd=processWnd[uiPid];

if(objWnd!=null)

{

ptrWnd=(IntPtr)objWnd;

if(ptrWnd!=IntPtr.Zero&&IsWindow(ptrWnd)) // 从缓存中获取句柄

{

return ptrWnd;

}

else

{

ptrWnd=IntPtr.Zero;

}

}

bool bResult=EnumWindows(new WNDENUMPROC(EnumWindowsProc),uiPid);

// 枚举窗口返回 false 并且没有错误号时表明获取成功

if(!bResult&&Marshal.GetLastWin32Error()==0)

{

objWnd=processWnd[uiPid];

if(objWnd!=null)

{

ptrWnd=(IntPtr)objWnd;

}

}

return ptrWnd;

}

private static bool EnumWindowsProc(IntPtr hwnd,uint lParam)

{

uint uiPid=0;

if(GetParent(hwnd)==IntPtr.Zero)

{

GetWindowThreadProcessId(hwnd,ref uiPid);

if(uiPid==lParam) // 找到进程对应的主窗口句柄

{

processWnd.Add(uiPid,hwnd); // 把句柄缓存起来

SetLastError(0); // 设置无错误

return false; // 返回 false 以终止枚举窗口

}

}

return true;

}

调用：

IntPtr hh=GetHandleByProcessName("notepad.exe");

if(hh!=IntPtr.Zero)

{

SendMessage((int)hh,0x000C,0,"A"); //打开记事本，发送字母A

}