如何从C＃传递管理位图裹非托管的OpenCV的垫 [英] How to pass managed Bitmap from C# to wrapped unmanaged OpenCV's Mat
问题描述
我有3个部分项目：
-
有一个回调，给了我一个位图托管C＃项目（它应该具有的PixelFormat = Format24bppRgb）。我试过几种方法的位图到的东西我能传递给第2部分转换，这是我试过的最后一件事：
Managed C# project with a callback which gives me a Bitmap (it should have PixelFormat = Format24bppRgb). I've tried several ways to convert the Bitmap into something I could pass to part 2, that's the last thing I've tried:
public int BufferCB(IntPtr pBuffer, int BufferLen)
{
byte[] aux = new byte[BufferLen];
Marshal.Copy(pBuffer, aux, 0, BufferLen);
String s_aux = System.Text.Encoding.Default.GetString(aux);
wrappedClassInstance.GetBitmap(s_aux);
}
托管C ++ / CLI包装项目3：
Managed C++/CLI to wrap item 3:
int WrappedClass::GetBitmap(array<System::Byte>^ s_in) {
pin_ptr<unsigned char> pin = &s_in[0];
unsigned char* p = pin;
return privateImplementation->GetBitmap(p);
}
非托管C，它使用了OpenCV ++应用程序。我想这个数据加载到凉席：
Unmanaged C++ application that uses OpenCV. I want to load this data into a Mat with:
Mat myMat;
int NativeClass::GetBitmap(unsigned char *s_in) {
// If there's no input:
if (!s_in) {
return -1;
}
/* h and w are defined elsewhere */
myMat = Mat(h, w, CV_8UC3, (void *)s_in, Mat::AUTO_STEP));
imwrite("test.bmp", myMat);
return 0;
}
当达到一个异常的imwrite功能被抛出：System.Runtime.InteropServices.SEHException（0X80004005）。它没有说太多，但我猜当我整理它，我传递到垫中的数据被损坏了。
When the the imwrite function is reached an exception is thrown: "System.Runtime.InteropServices.SEHException (0x80004005)". It doesn't say much, but I'm guessing the data I passed into the Mat got corrupted when I've marshalled it.
之前，我是想传递数据，而无需一个包装：
Before, I was trying to pass the data without a wrapper:
[DllImport("mydll.dll", ...)]
static extern void GetBitmap(IntPtr pBuffer, int h, int w);
void TestMethod(IntPtr pBuffer, int BufferLen)
{
// h and w defined elsewhere
// GetBitmap is essentially the same as in item 3.
GetBitmap(pBuffer, BufferLen, h, w);
}
和起作用的（它保存了位图到文件），但因为DLL保持连接直到我杀的过程，解决方案是不是对我不够好。我也不想镜子的垫类到我的项目，因为我知道应该垫一些字符接收数据*。
and that worked (it saved the Bitmap into the file), but because the DLL stays attached until I kill the process that solution is not good enough for me. I also don't want to "mirror" the Mat class into my project, as I know Mat should accept data from some char*.
请帮帮忙，我该怎么办呢？我做错了类型转换？
Please help, how can I do this? Am I doing wrong type conversions?
感谢您。
推荐答案
我已经改变了部分2到memcpy的非托管内存到本机内存，只是要确定。但随着我的code，真正的问题是，每次我想要得到一个新的垫子，我会打电话给垫的构造函数：
I've changed part 2 to memcpy unmanaged memory into native memory, just to be sure. But the real problem with my code was that everytime I wanted to get a new Mat, I'd call Mat constructor:
Mat myMat;
int MyClass::GetBitmap(unsigned char* s_in) {
myMat = Mat(...)
}
相反，我所做的：
Instead, I did:
Mat myMat;
int MyClass::GetBitmap(unsigned char* s_in) {
Mat aux;
aux = Mat(...)
aux.copyTo(myMat);
aux.release();
}
...现在我的code为正常使用。
... and now my code is working perfectly.
编辑：
删除，这使用了一些部件新垫（...），这是一个错字，它不会编译，因为我使用的垫子，不是太*。
Removed some parts which used new Mat(...), it was a typo and it wouldn't compile because I'm using Mat, not Mat*.
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