这个pinvoke有什么问题吗?
我有这段代码尚未修改,但突然它停止工作了......我可以发誓它曾经工作但不能保证它。它抛出一个异常:
尝试读取或写入受保护的内存。这通常表明其他内存已损坏。
static void Main(string[] args)
{
ErrorMsg(123);
}
[DllImport("kernel32.dll", EntryPoint = "FormatMessageW", CharSet = CharSet.Auto)]
static extern int FormatMessage(int dwFlags, IntPtr lpSource, long dwMessageId, int dwLanguageId, out IntPtr MsgBuffer, int nSize, IntPtr Arguments);
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public static extern int GetThreadLocale();
/// <summary>
/// Gets a Locale specific windows error
/// code specified.
/// </summary>
/// <param name="errorcode">The errorcode.</param>
public static string ErrorMsg(long errorcode)
{
try
{
if (errorcode == 0)
return "No Error";
IntPtr pMessageBuffer;
int dwBufferLength;
string sMsg;
int dwFormatFlags;
//FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS
dwFormatFlags = 0x00000100 | 0x00000200 | 0x00001000;
dwBufferLength = FormatMessage(dwFormatFlags, IntPtr.Zero, errorcode, GetThreadLocale(), out pMessageBuffer, 0, IntPtr.Zero);
if (dwBufferLength == 0)
return "An Unknown Error Has occured.";
sMsg = Marshal.PtrToStringUni(pMessageBuffer);
Marshal.FreeHGlobal(pMessageBuffer);
return sMsg;
}
catch (Exception ex)
{
return "An Unknown Error Has occured.";
}
}
我在这里做错了什么,我似乎找不到任何东西?谢谢!
I have this piece of code that has not been modified but all of a sudden it has stopped working... I could swear that it used to work but can't guarantee it. It throws an exception:
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
static void Main(string[] args)
{
ErrorMsg(123);
}
[DllImport("kernel32.dll", EntryPoint = "FormatMessageW", CharSet = CharSet.Auto)]
static extern int FormatMessage(int dwFlags, IntPtr lpSource, long dwMessageId, int dwLanguageId, out IntPtr MsgBuffer, int nSize, IntPtr Arguments);
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public static extern int GetThreadLocale();
/// <summary>
/// Gets a Locale specific windows error
/// code specified.
/// </summary>
/// <param name="errorcode">The errorcode.</param>
public static string ErrorMsg(long errorcode)
{
try
{
if (errorcode == 0)
return "No Error";
IntPtr pMessageBuffer;
int dwBufferLength;
string sMsg;
int dwFormatFlags;
//FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS
dwFormatFlags = 0x00000100 | 0x00000200 | 0x00001000;
dwBufferLength = FormatMessage(dwFormatFlags, IntPtr.Zero, errorcode, GetThreadLocale(), out pMessageBuffer, 0, IntPtr.Zero);
if (dwBufferLength == 0)
return "An Unknown Error Has occured.";
sMsg = Marshal.PtrToStringUni(pMessageBuffer);
Marshal.FreeHGlobal(pMessageBuffer);
return sMsg;
}
catch (Exception ex)
{
return "An Unknown Error Has occured.";
}
}
What am I doing wrong here, I can't seem to find anything? Thanks!
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当我在我的机器上测试你的代码时,它运行得很好。顺便说一句,您是否有任何理由不喜欢以下方法,该方法稍微短一点并实现了相同的目标:
当然在幕后
Win32Exception
PInvokes intoFormatMessage
但至少应该担心的是 .NET 框架它,不是我们。更新:
以下是
Win32Exception.GetErrorMessage
方法在 .NET 中的实现方式:其中
FormatMessage
声明如下:Your code worked fine when I tested it on my machine. By the way is there any reason you wouldn't prefer the following method which is a little shorter and achieves equivalent goal:
Of course under the covers
Win32Exception
PInvokes intoFormatMessage
but at least it's the .NET framework that should worry about it, not us.UPDATE:
Here's how the
Win32Exception.GetErrorMessage
method is implemented in .NET:where
FormatMessage
is declared like this:尝试 sMsg = Marshal.PtrToStringUni(pMessageBuffer, dwBufferLength);
Try sMsg = Marshal.PtrToStringUni(pMessageBuffer, dwBufferLength);