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如何在C#中拍摄Winforms控件/窗体的屏幕截图?_C#_.net_Winforms_Listview - Fatal编程技术网

如何在C#中拍摄Winforms控件/窗体的屏幕截图?

如何在C#中拍摄Winforms控件/窗体的屏幕截图?,c#,.net,winforms,listview,C#,.net,Winforms,Listview,我有一个listview控件,它位于winforms窗体上。它填满了整个屏幕,但屏幕上显示的项目比屏幕上显示的项目还多 如何拍摄整个控件的屏幕截图,就好像我可以在屏幕上显示listview的全部内容一样?因此,如果整个listview需要1000 x 4000像素,那么我需要一个这样大小的图像/位图 我该怎么做?当我尝试printscreen时,它只返回屏幕上的内容,而屏幕外的任何内容都显示为灰色。表单是控件,因此您应该能够使用以下内容将整个内容保存到位图中: var bm = new Bitm

我有一个
listview
控件,它位于winforms窗体上。它填满了整个屏幕,但屏幕上显示的项目比屏幕上显示的项目还多

如何拍摄整个控件的屏幕截图,就好像我可以在屏幕上显示
listview
的全部内容一样?因此,如果整个
listview
需要1000 x 4000像素,那么我需要一个这样大小的图像/位图


我该怎么做?当我尝试printscreen时,它只返回屏幕上的内容,而屏幕外的任何内容都显示为灰色。

表单是控件,因此您应该能够使用以下内容将整个内容保存到位图中:

var bm = new Bitmap(yourForm.Width, yourForm.Height);
yourForm.DrawToBitmap(bm, bm.Size);
bm.Save(@"c:\whatever.gif", ImageFormat.Gif);
var f = yourControl.Font;
var lineHeight = f.GetHeight();

// Find size of canvas
var s = new SizeF();
using (var g = yourControl.CreateGraphics())
{
    foreach (var item in yourListBox.Items)
    {
        s.Height += lineHeight ;
        var itemWidth = g.MeasureString(item.Text, f).Width;
        if (s.Width < itemWidth)
            s.Width = itemWidth;
    }

    if (s.Width < yourControl.Width)
         s.Width = yourControl.Width;
}

using( var canvas = new Bitmap(s) )
using( var g = Graphics.FromImage(canvas) )
{
    var pt = new PointF();
    foreach (var item in yourListBox.Items)
    {
        pt.Y += lineHeight ;
        g.DrawString(item.Text, f, Brushes.Black, pt);
    }

    canvas.Save(wherever);
}
更新
DrawToBitmap
只绘制屏幕上的内容。如果要绘制列表的全部内容,则必须遍历列表以查找内容的大小,然后绘制每个项目。比如:

var bm = new Bitmap(yourForm.Width, yourForm.Height);
yourForm.DrawToBitmap(bm, bm.Size);
bm.Save(@"c:\whatever.gif", ImageFormat.Gif);
var f = yourControl.Font;
var lineHeight = f.GetHeight();

// Find size of canvas
var s = new SizeF();
using (var g = yourControl.CreateGraphics())
{
    foreach (var item in yourListBox.Items)
    {
        s.Height += lineHeight ;
        var itemWidth = g.MeasureString(item.Text, f).Width;
        if (s.Width < itemWidth)
            s.Width = itemWidth;
    }

    if (s.Width < yourControl.Width)
         s.Width = yourControl.Width;
}

using( var canvas = new Bitmap(s) )
using( var g = Graphics.FromImage(canvas) )
{
    var pt = new PointF();
    foreach (var item in yourListBox.Items)
    {
        pt.Y += lineHeight ;
        g.DrawString(item.Text, f, Brushes.Black, pt);
    }

    canvas.Save(wherever);
}
var f=yourControl.Font;
var lineHeight=f.GetHeight();
//找到画布的大小
var s=新的SizeF();
使用(var g=yourControl.CreateGraphics())
{
foreach(列表框中的var项。项)
{
s、 高度+=线宽;
var itemWidth=g.MeasureString(item.Text,f).Width;
如果(s.Width}
除非你不喜欢比特爆炸

Private Declare Function BitBlt Lib "gdi32" _
    (ByVal hDCDest As IntPtr, ByVal XDest As IntPtr, _
    ByVal YDest As IntPtr, ByVal nWidth As IntPtr, _
    ByVal nHeight As IntPtr, ByVal hDCSrc As IntPtr, _
    ByVal XSrc As IntPtr, ByVal YSrc As IntPtr, _
    ByVal dwRop As IntPtr) As IntPtr

Private Declare Function GetWindowDC Lib "user32" _
  (ByVal hWnd As IntPtr) As IntPtr

Private Declare Function ReleaseDC Lib "user32" _
  (ByVal hWnd As IntPtr, ByVal hdc As IntPtr) As IntPtr
Private Sub Blast()
    Dim dc As IntPtr
    dc = GetWindowDC(Me.Handle)
    Dim bm As Bitmap = New Bitmap(Me.Width, Me.Height)
    Dim g As Graphics = Graphics.FromImage(bm)
    Const vbSrcCopy = &HCC0020
    Dim gdc = g.GetHdc()
    BitBlt(gdc, 0, 0, Me.Width, Me.Height, dc, 0, 0, vbSrcCopy)
    g.ReleaseHdc()
    bm.Save("C:\yourfile.bmp", System.Drawing.Imaging.ImageFormat.Bmp)
    ReleaseDC(Me.Handle, dc)
End Sub

您是想用代码还是通过某种屏幕捕获工具来实现这一点?在代码中…………谢谢,我试过了,但位图显示为蓝色。我在listview上尝试了它,而不是表单,因为表单是固定的,但是listview有一个滚动条。DrawToBitmap绘制屏幕上的内容。您是否试图在没有滚动条的情况下打印ListView的内容?你必须分别画每个项目。我明白了,现在我正试图打印整个项目,就像你有一个无限大的显示器一样。我不在乎位图是否包含滚动条或其他内容,只要它将整个控件显示为位图即可。