从C＃调用C ++ dll函数的问题 [英] Problem in calling a C++ dll function from C#
问题描述
这是我在C＃中遇到一个blowfish问题的第三个线程。尽管事实上我的应用程序中没有实现blowfish，但我决定把它用作一个外部的C ++ DLL。
请注意，我已经尝试过Blowfish.NET和其他任何其他问题是我正在将代码从C ++转换为C＃，而C＃代码必须与C ++代码完全相同。
This is my 3rd thread concerning a blowfish problem in C#.Despite the fact I cannot have blowfish implemented in my application, I decided to use it as an external C++ dll. Please note I've tried Blowfish.NET and any other, the problem is that I'm translating code from C++ to C# and the C# code must do exactly the same as the C++ code does.
到目前为止：
注意，导出的函数在代码末尾
C＃代码（定义）
[DllImport("TestDLL.dll", EntryPoint = "Initkey" ,ExactSpelling = true , CallingConvention = CallingConvention.Cdecl)]
public static unsafe extern void Initkey(byte[] key);
[DllImport("TestDLL.dll", EntryPoint = "encode", ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
public static unsafe extern void encode(UInt32 *stream);
C＃代码（函数调用）
C# code(function calling)
- 初始化blowfish key
-Initialize blowfish key
UInt32[] keyarray = new UInt32[2];
//some code
Extern.Initkey(Misc.ConvertFromUInt32Array(keyarray));
//
//
//Helper function used to convert a UInt32 array into Byte array.
public static byte[] ConvertFromUInt32Array(UInt32[] array)
{
List<byte> results = new List<byte>();
foreach (UInt32 value in array)
{
byte[] converted = BitConverter.GetBytes(value);
results.AddRange(converted);
}
return results.ToArray();
}
- 对数据进行编码。
-Encode the data.
UInt32[] keyarray2 = new UInt32[2];
//some code
unsafe
{
fixed (UInt32* LPBYTE = keyarray2)
{
Extern.encode(LPBYTE);
}
}
在键盘2被Encode功能覆盖后，我检查C ++代码中的值通过解密来确保一切正常。
After keyarray2 is overwritten by the Encode function, I check the values in the C++ code by decrypting them to make sure everything is alright.
嗯，没关系，这是我的问题，这就是为什么我要求你帮忙
Well, It's not alright.That's my problem, That's why I am asking you for your help.
当我解密它们时，值是不同的，但是如果我加密它们并在C ++源码中解密它们是相等的.C ++代码是完全相同的，除了没有DLL，因为代码在C ++中。
The values are different when I decrypt them,but If I encrypt them and decrypt them in the C++ source, they are equal.The C++ code is absolutely the same,except that there's no DLL since the code is in C++.
可能是因为Initialize函数。我已经读了几个月前，C ++中的数组是作为指针传递，我不相信，但即使如此 - 这可能是问题？
Could that be, because of the Initialize function.I had read a couple of months ago that arrays in C++ are passed as Pointers.I don't believe it,but even so - could that be the problem?
我找不到一个线索。我在C＃中浪费了我的生命。至少这个解决方案应该有效，但是它不是 - 为什么？
I can't find a clue. I have wasted my life with that blowfish in C#. At least that solution should work, but it doesn't - Why?
推荐答案
要添加到jachymko所说的内容，还要检查BitConverter的文档 - 您需要确保以您想要的字节顺序传递密钥和数据。
注意 - 从以前的线程，我使用修改的Blowfish.NET加密器成功加密数据，并将其与C ++代码的结果相匹配。
To add to what jachymko has said, also check the documentation for BitConverter - you need to be sure you are passing the key and data in the byte order you intended. Note - from your previous thread, I successfully encrypted data using the modified Blowfish.NET encryptor and got it to match the result of your C++ code.
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