Question

我正在编写自己的DIB / BMP解码器（我知道已有其他人，但我正在学习图像处理）并且我已设法将像素存储在指针中并获得用于编写hBitmap的相关尺寸，但是这个错误不断出现：

Generic Error Occured in GDI+.

下面是堆栈跟踪和代码：

at System.Drawing.Image.FromHbitmap(IntPtr hbitmap, IntPtr hpalette)
at System.Drawing.Image.FromHbitmap(IntPtr hbitmap)
at pcx_reader.bmp.BitmapFromPCXBits(Int32 height, Int32 width, Int32 numplanes, Int32 bpp, IntPtr pixels)
at pcx_reader.MainWindow.button1_Click(Object sender, RoutedEventArgs e)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
at System.Windows.Controls.MenuItem.InvokeClickAfterRender(Object arg)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
at System.Threading.ExecutionContext.runTryCode(Object userData)
at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.Run()
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at System.Windows.Application.Run()
at pcx_reader.App.Main()
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

代码：

    public Bitmap BitmapFromPCXBits(int height, int width, int numplanes, int bpp, IntPtr pixels)
    {
        IntPtr hDc = CreateCompatibleDC(IntPtr.Zero);
        IntPtr hBitmap = IntPtr.Zero;
        IntPtr hOldBitmap = IntPtr.Zero;

        hBitmap = CreateBitmap(width, height, (uint)numplanes, (uint)bpp, pixels);
        hOldBitmap = SelectObject(hDc, hBitmap);

        System.Drawing.Bitmap bmp = System.Drawing.Bitmap.FromHbitmap(hBitmap);
        //Bitmap bmp = new Bitmap(width, height, stride, System.Drawing.Imaging.PixelFormat.Format1bppIndexed, pixels);

        DeleteObject(SelectObject(hDc, hOldBitmap));

        DeleteDC(hDc);

        return bmp;
    }

我不知道出了什么问题，但是我对PCX文件使用了类似的功能，但是除了单色图像外，它们都会失败，渲染效果很好。如果有人可以提供帮助，我会非常感激。

Answer 1

如果不知道你的通话中有哪些输入参数，很难分辨出来......

无论如何要尝试几件事：

检查CreateBitmap（）的返回值！
确保位面数量正确
改为使用Bitmap构造函数（对于Bitmap格式使用GDI +枚举，如果已知平面数，则可能不需要将其作为参数传递）

//这适用于C ++

HDC hOff = :: CreateCompatibleDC（NULL）;

位图oDaBigOne（g_iWidth，g_iHeight，PixelFormat32bppARGB）;

HBITMAP hBMit = NULL;

颜色oCol（0,0,0,0）;

oDaBigOne.GetHBITMAP（oCol，＆amp; hBMit）;

HGDIOBJ hSave = :: SelectObject（hOff，hBMit）;

将hBitmap保存为位图时的通用GDI +错误

1 个答案: