Attempted to read or write protected memory.

[flyaqiao]

Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
我的程序经常出这个错误.
有大侠指点呀.

[真相重于对错]

调用 win32 dll ??

[flyaqiao]

代码是这样的:
IntPtr pi = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(StructDevMode)));
if (pi == IntPtr.Zero)
return;
try
{
settings.CopyToHdevmode(pi);
StructDevMode devmode = (StructDevMode)Marshal.PtrToStructure(pi, typeof(StructDevMode));
devmode.dmSize = (short)Marshal.SizeOf(typeof(StructDevMode));
devmode.dmPaperSize = 0x100;
devmode.dmPaperWidth = (short)(size.Width * 10); // 以0.1mm为单位的宽度
devmode.dmPaperLength = (short)(size.Height * 10); // 以0.1mm为单位的高度
devmode.dmFields = 14; // DM_PAPERSIZE ¦ DM_PAPERLENGTH ¦ DM_PAPERWIDTH;
Marshal.StructureToPtr(devmode, pi, false);
settings.SetHdevmode(pi);
}
catch { }
finally
{
Marshal.FreeHGlobal(pi);
}

这段代码经常报表"内存无效的错误",导致程序自动退出.无法Catch,有哪位大侠能帮我.

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
internal struct StructDevMode
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public String dmDeviceName;
[MarshalAs(UnmanagedType.U2)]
public short dmSpecVersion;
[MarshalAs(UnmanagedType.U2)]
public short dmDriverVersion;
[MarshalAs(UnmanagedType.U2)]
public short dmSize;
[MarshalAs(UnmanagedType.U2)]
public short dmDriverExtra;
[MarshalAs(UnmanagedType.U4)]
public int dmFields;
[MarshalAs(UnmanagedType.I2)]
public short dmOrientation;
[MarshalAs(UnmanagedType.I2)]
public short dmPaperSize;
[MarshalAs(UnmanagedType.I2)]
public short dmPaperLength;
[MarshalAs(UnmanagedType.I2)]
public short dmPaperWidth;
[MarshalAs(UnmanagedType.I2)]
public short dmScale;
[MarshalAs(UnmanagedType.I2)]
public short dmCopies;
[MarshalAs(UnmanagedType.I2)]
public short dmDefaultSource;
[MarshalAs(UnmanagedType.I2)]
public short dmPrintQuality;
[MarshalAs(UnmanagedType.I2)]
public short dmColor;
[MarshalAs(UnmanagedType.I2)]
public short dmDuplex;
[MarshalAs(UnmanagedType.I2)]
public short dmYResolution;
[MarshalAs(UnmanagedType.I2)]
public short dmTTOption;
[MarshalAs(UnmanagedType.I2)]
public short dmCollate;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public String dmFormName;
[MarshalAs(UnmanagedType.U2)]
public short dmLogPixels;
[MarshalAs(UnmanagedType.U4)]
public int dmBitsPerPel;
[MarshalAs(UnmanagedType.U4)]
public int dmPelsWidth;
[MarshalAs(UnmanagedType.U4)]
public int dmPelsHeight;
[MarshalAs(UnmanagedType.U4)]
public int dmNup;
[MarshalAs(UnmanagedType.U4)]
public int dmDisplayFrequency;
//[MarshalAs(UnmanagedType.U4)]
//public int dmICMMethod;
//[MarshalAs(UnmanagedType.U4)]
//public int dmICMIntent;
//[MarshalAs(UnmanagedType.U4)]
//public int dmMediaType;
//[MarshalAs(UnmanagedType.U4)]
//public int dmDitherType;
//[MarshalAs(UnmanagedType.U4)]
//public int dmReserved1;
//[MarshalAs(UnmanagedType.U4)]
//public int dmReserved2;
//[MarshalAs(UnmanagedType.U4)]
//public int dmPanningWidth;
//[MarshalAs(UnmanagedType.U4)]
//public int dmPanningHeight;
}

[y740504]

我也想知道呀,请高手回答呀!别让他沉下去呀

[ttbo88]

up

[glboy12]

是版本问题吗?
这类问题没有遇到过,等待答案

[flyaqiao]

.Net 2.0

[flyaqiao]

有时能得到这个Call Stack
at System.Drawing.SafeNativeMethods.Gdip.IntGdipDisposeImage(HandleRef image)
at System.Drawing.SafeNativeMethods.Gdip.GdipDisposeImage(HandleRef image)
at System.Drawing.Image.Dispose(Boolean disposing)
at System.Drawing.Image.Finalize()

[cyy1981]

遇到过，用过的没有释放掉，你在需要释放的地方用using，调了win32的话要实现idisposal接口

[chen_f_z]

期待更详细的解答！

[lmj_1111]

没有实例化造成的，指针的值不确定

[ziliaobeifun]

仁兄，这个问题解决了吗？我也遇到这样的问题。

[HelloCattt]

我新建一个工程也还是这样的问题！帖子别沉啊！
昨天一切正常，今天想改点代码的时候，大绝form1的UI出不来，点击就是这个报错提示，但是在WinCE上的仿真仍旧正常啊。