如何将图像保存为图像/ pdf？

Question

HI全部， 我确实有一个胜利的形式，它像一个售票机。 我有一个页面，我将获得所有的用户信息，然后点击一个名为Generate Bill的按钮，将会显示一个带有标签控件的ht背景（如公司徽标名称等）来自以前表单的信息。如何保存新表单（票证）？

我该怎么做？

Answer 1

我的CC.Utilities增加了一个DrawToImage()扩展方法到Control类可能会帮助你。我会在一秒内发布一些代码片段。

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; 
} 

的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); 
} 

的命名空间是一点点从复制/粘贴搞砸但是如果您需要更多的东西，您可以查看完整的项目，或者这可能足以让您指向正确的方向。