如何将获胜形式保存为图像/pdf?

问题描述：

大家好，我确实有一个获胜表格，它类似于售票机.我有一个页面，我将在其中获取所有用户信息，然后单击名为 Generate Bill 的按钮将显示一个带有一些图像作为 ht 背景的 winform(例如公司徽标名称等)，标签控件放置在适当的位置，将显示上一个表格中的信息.如何保存新表格(票)?

HI All, I do have a win form, its something like a ticket machine. i have one page where i will be getting all the user information and then click of a button called Generate Bill will show a winform with some image as ht background(say company logo name etc.) with label controls placed in position which will display the information from the previous form. How to save the new form(ticket)?

我该怎么做?

答

我的 CC.Utilities 添加了一个 Control 类的 code>DrawToImage() 扩展方法可能会对您有所帮助.我稍后会发布一些代码片段.

My CC.Utilities adds a DrawToImage() extension method to the Control class that might help you. I'll post some code snippets in a sec.

辅助方法:

/// <summary>
/// Captures an <see cref="Image"/> of the specified window
/// </summary>
/// <param name="handle">The handle of the window to capture</param>
/// <returns>An <see cref="Image"/> of the specified window</returns>
public static Image CaptureWindow(IntPtr handle)
{

    IntPtr hdcSrc = User32.GetWindowDC(handle);

    RECT windowRect = new RECT();
    User32.GetWindowRect(handle, windowRect);

    int width = windowRect.right - windowRect.left;
    int height = windowRect.bottom - windowRect.top;

    IntPtr hdcDest = Gdi32.CreateCompatibleDC(hdcSrc);
    IntPtr hBitmap = Gdi32.CreateCompatibleBitmap(hdcSrc, width, height);

    IntPtr hOld = Gdi32.SelectObject(hdcDest, hBitmap);
    Gdi32.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, InteropConstants.SRCCOPY);
    Gdi32.SelectObject(hdcDest, hOld);
    Gdi32.DeleteDC(hdcDest);
    User32.ReleaseDC(handle, hdcSrc);

    Image image = Image.FromHbitmap(hBitmap);
    Gdi32.DeleteObject(hBitmap);

    return image;
}

P/调用:

[DllImport("user32.dll")]
public static extern IntPtr GetWindowDC(IntPtr hWnd);

[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr GetWindowRect(IntPtr hWnd, [Out] RECT rect);

[DllImport("gdi32.dll")]
public static extern bool BitBlt(IntPtr hObject, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hObjectSource, int nXSrc, int nYSrc, int dwRop);

[DllImport("gdi32.dll")]
public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC, int nWidth, int nHeight);

[DllImport("gdi32.dll")]
public static extern IntPtr CreateCompatibleDC(IntPtr hDC);

[DllImport("gdi32.dll")]
public static extern bool DeleteDC(IntPtr hDC);

[DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);

[DllImport("gdi32.dll")]
public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);

[StructLayout(LayoutKind.Sequential, Pack = 4, CharSet = CharSet.Auto)]
public class RECT
{
    public int left;
    public int top;
    public int right;
    public int bottom;
}

扩展方法:

/// <summary>
/// Draws the <see cref="Control"/> to an <see cref="Image"/>
/// </summary>
/// <param name="control">The <see cref="Control"/> to draw.</param>
/// <returns>An <see cref="Image"/> of the <see cref="Control"/></returns>
public static Image DrawToImage(this Control control)
{
    return Utilities.CaptureWindow(control.Handle);
}

复制/粘贴的命名空间有点混乱，但如果您需要更多，您可以查看完整的项目，或者这可能足以为您指明正确的方向.

The namespace is a little messed up from the copy/paste but you can look at the full project if you need more or this might be enough to point you in the right direction.

如何将获胜形式保存为图像/pdf?

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