C # Implementation View text box (e.g., * Password box)

The text box is idle today, try to write the program in C # to view the Password box (not limited to the password box, should be any text control can be)
code see below.
With C + + to achieve a super simple such dongdong. With C # is very complex, I do not want to use unsafe, I always think with unsafe words, why not simply use C + +.

int length=300;
INTPTR Thandle=apis.getlocalwindow ()//Get the control handle where the current mouse is located
int Address=apis.virtualallocex (process.getcurrentprocess (). HANDLE,0,LENGTH,0X1000,0X04);//Allocate Length of memory within this process
Apis.sendmessage (thandle,0x000d,new IntPtr (255), New INTPTR (address))//Send message to target control, 0x000d is Wm_gettext, 255 means to save the returned value, and new IntPtr (address)
Byte[] Buf=new byte[length];
Apis.readprocessmemory (Process.getcurrentprocess (). handle,address,buf,length,0);/Read what you just saved
MessageBox.Show (Encoding.Default.GetString (BUF))//show out to test.

Where the APIs begin with, I write my own API class library, the relevant statement is as follows:
[DllImport ("user32.dll")]
public static extern IntPtr Windowfrompoint (
Point Lppoint
);

[DllImport ("user32.dll")]
public static extern int GetCursorPos (
Out Point Lppoint
);
public static INTPTR Getlocalwindow ()//This just combined the last two.
{
Point Point;
GetCursorPos (out point);
Return Windowfrompoint (point);
}

Without ex. There's no need for the first handle parameter.
[DllImport ("Kernel32.dll")]
public static extern System.Int32 VirtualAllocEx (
System.IntPtr hprocess,
System.Int32 lpaddress,
System.Int32 dwsize,
System.Int16 Flallocationtype,
System.Int16 Flprotect
);

[DllImport ("User32.dll")]
public static extern IntPtr SendMessage (
IntPtr HWnd,
int MSG,
IntPtr WParam,
IntPtr LParam
);

[DllImport ("Kernel32.dll")]
public static extern int ReadProcessMemory (
System.IntPtr hprocess,
System.Int32 Lpbaseaddress,
Byte[] lpbuffer,
Long Nsize,
Long Lpnumberofbyteswritten
);


*******************************************************************
Because the general to see is the external program, with shortcut key without losing a good method.
The implementation of C # is as follows:
Add the code in the initialization window
Keymodifiers modifiers=keymodifiers.windows;//is defined as a win+ shortcut key, or it can be defined as something else.
RegisterHotKey (Handle, 1001,MODIFIERS,KEYS.V)//Assign ID 1001 to Win+v

Override a little bit WndProc
protected override void WndProc (ref message M)
{
const int wm_hotkey = 0x0312;
Switch (m.msg)
{
Case Wm_hotkey:
Switch (M.wparam.toint32 ())
{
Case 1001:
Onhotkeyv ();
Break
Default:break;
}
Break
}
Base. WndProc (ref m);
}
In the ONHOTKEYV function, write the code that I wrote the first time.