[DllImport("user32.dll", EntryPoint = "GetDC")]
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public static extern IntPtr GetDC(IntPtr hWnd);
[DllImport("user32.dll", EntryPoint = "ReleaseDC")]
public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
先找到你要截图的那个窗体的 句柄 然后根据这个句柄得到改窗体的DC 创建一个bitmap 然后填充 得到的bitmap后 显示到picturebox里面
'以下代码放模块，否则必须适当修改函数权限
Private Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, ByVal hdc As Long) As Long
Private Declare Function OpenClipboard Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function EmptyClipboard Lib "user32" () As Long
Private Declare Function SetClipboardData Lib "user32" (ByVal wFormat As Long, ByVal hMem As Long) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal X As Long, ByVal Y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Private Declare Function CreateDC Lib "gdi32" Alias "CreateDCA" (ByVal lpDriverName As String, ByVal lpDeviceName As String, ByVal lpOutput As String, lpInitData As Long) As Long
Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Private Declare Function CloseClipboard Lib "user32" () As Long
Public Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Public Declare Function ClientToScreen Lib "user32" (ByVal hwnd As Long, lpPoint As POINTAPI) As Long
Private Type POINTAPI
X As Long
Y As Long
End Type
Public pt1 As POINTAPI, pt2 As POINTAPI
Public pt As POINTAPI
'函数提供指定区域截图，置入剪切板
Public Sub ScrnCap(Lt As Long, top As Long, Rt As Long, Bot As Long)
Dim rWidth, rHeight, SourceDC, DestDC, BHandle, Wnd, DHandle
rWidth = Rt - Lt
rHeight = Bot - top
SourceDC = CreateDC("DISPLAY", 0, 0, 0)
DestDC = CreateCompatibleDC(SourceDC)
BHandle = CreateCompatibleBitmap(SourceDC, rWidth, rHeight)
SelectObject DestDC, BHandle
BitBlt DestDC, 0, 0, rWidth, rHeight, SourceDC, Lt, top, HCC0020
Wnd = Screen.ActiveForm.hwnd
OpenClipboard Wnd
EmptyClipboard
SetClipboardData 2, BHandle
CloseClipboard
DeleteDC DestDC
ReleaseDC DHandle, SourceDC
End Sub
'**********************************************************************************
'以下代码应该放窗体，单击执行
Private Sub Form_Click()
Dim Image1 As Object
Set Image1 = Controls.Add("VB.Image", "Image1") '添加控件用于显示
Image1.Visible = True: Image1.BorderStyle = 1 '样式
pt1.X = 100 / Screen.TwipsPerPixelX '单位转换
pt1.Y = 100 / Screen.TwipsPerPixelY
pt2.X = 1200 / Screen.TwipsPerPixelX
pt2.Y = 1200 / Screen.TwipsPerPixelY
ClientToScreen Me.hwnd, pt1 '转屏幕坐标
ClientToScreen Me.hwnd, pt2
Call ScrnCap(pt1.X, pt1.Y, pt2.X, pt2.Y) '调用函数，参数为左上，右下坐标
Image1.Picture = Clipboard.GetData() '图像显示
On Error Resume Next
Sleep 500
SavePicture Clipboard.GetData, "C:\图片1.bmp" '保存图像
End Sub
’测试通过，
'注：自定义函数ScrnCap()是核心截图函数，Form_Click()里有窗口坐标客户区转屏幕的实例代码，很明了，一看就懂
'模块中
Declare Function GetDC Lib "user32" (ByVal hwnd As Long) _
As Long
Public Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, ByVal hdc As Long) As Long
Declare Function BitBlt Lib "gdi32" _
(ByVal hDestDC As Long, ByVal x As Long, _
ByVal y As Long, ByVal nWidth As Long, _
ByVal nHeight As Long, ByVal hSrcDC As Long, _
ByVal xSrc As Long, ByVal ySrc As Long, _
ByVal dwRop As Long) As Long
'form1中
Private Sub Command1_Click()
Dim hDCtmp As Long, picWidth As Double, picHeight As Double
Dim x As Double
Dim y As Double
x = Val(Text2.Text)
y = Val(Text3.Text)
picWidth = Val(Text3.Text)
picHeight = Val(Text4.Text)
hDCtmp = GetDC(0)
BitBlt Picture1.hdc, 0, 0, picWidth, picHeight, hDCtmp, x, y, vbSrcCopy
ReleaseDC 0, hDCtmp
End Sub
目的: 将屏幕按照指定坐标和大小进行截取成图,在picture1显示
问题: 大小是相同了,为什么截取的坐标不对,只是屏幕上的左上
相信大家都用过QQ截图功能。不过很多人并没有真正掌握好它的用法。将QQ截图与其它截屏和制图软件配合使用，会有意想不到的效果。
获取颜色的RGB值
我们在编辑图片或网页的时候，经常需要获取某种颜色的“RGB值”，所以很多人都安装了第三方的颜色吸取工具。其时用QQ截图键即可获取屏幕上任意颜色的RGB值。
当按下“Ctrl+Shift+A”弹出“截图”提示框时，提示框中的“当前像素RGB”即为当前鼠标屏幕位置的颜色RGB值，将鼠标移动到你想查看的屏幕颜色上即可获得相应的RGB值（如图1）。
图1精确截取图片大小
有时我们对要使用的截图尺寸有严格要求，比如论坛签名或QQ头像等。用QQ截图键可以按尺寸精确截取，一步到位无需再进行后期裁剪了。
按下QQ截图键，按住鼠标不放选取截取范围时，在鼠标上方会有一个信息框显示当前范围的详细信息，其中“矩形大小”就是以像素来表示的图片的尺寸大小，括号内的数字分别表示的是长和高（如图2）。松开鼠标调整截图框时，对照“矩形大小”就可以按需要的尺寸来精确截图范围，然后用鼠标点住截图框将截图框拖到要截取的图片上，双击即可获得所需尺寸的图片了。
图2图片拼贴好帮手
大部分的截图软件一次只能截取一张图片，当要截取多张图片并进行拼贴组合时，就需要一张一张截取全部保存后再进行拼贴操作，非常麻烦。
我们知道用QQ截图键截取的图片可以在任一个可以粘贴图片的程序中使用，这样只需用截图软件进行一次截图操作，剩下的图片用QQ截图键来截取，然后依次粘贴到截图软件的窗口中即可快速进行拼贴操作了，是不是很方便啊。
小提示：QQ截图键无需打开聊天窗口即可使用，截取的图片在任一可粘贴图片的程序窗口中如画图、Word等，使用“粘贴”命令即可使用
Me.Refresh()
Dim memory As Image = New Bitmap(Me.Width, Me.Height)
Dim g As Graphics = Graphics.FromImage(memory)
g.CopyFromScreen(Me.Left, Me.Top, 0, 0, New Size(Me.Width, Me.Height)) '这里是截屏核心代码
Dim FilePath As String = ""
Dim d As New SaveFileDialog
d.Filter = "JPEG图像|*.JPEG"
If d.ShowDialog = Windows.Forms.DialogResult.OK Then
FilePath = d.FileName
If FilePath = "" Then Exit Sub
'If FilePath.Substring(FilePath.Length - 1, 1) "\" Then FilePath = FilePath "\"
Else
Exit Sub
End If
d.Dispose()
memory.Save(FilePath)
MessageBox.Show("图像已经保存到： " FilePath, "截图成功", MessageBoxButtons.OK, MessageBoxIcon.Information)
INTOUCH自带的就有，打印屏幕的命令
自己写个时间条件运行那命令就可以了
PRINTSCREEN这个命令 具体怎么用 看下帮助
希望我的回答对你有所帮助
如有其他问题，可以继续追问，您的采纳是我前进的动力！