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？
不用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
}