如何将 C# 数组传递给 C++并将其返回给 C# 并附加其他项目？
我有一个使用 C++ dll 的 C# 项目。 （在 Visual Studio 2010 中）
我必须将一个 int 数组从 C# 代码传递给 C++ 函数，C++ 函数将在数组中添加一些元素，当控制权返回到 C# 代码时，C# 代码也会在同一数组中添加元素。
最初我在 C# 代码中声明了一个数组（大小为 10000），C++ 代码能够添加元素（因为它只是一个 int 数组，内存分配是相同的），但问题是由于访问而出现运行时错误数组之外。
我可以将大小增加到 100000，但我再次不知道 C++ 代码将添加多少元素（即使它可以只是 1 个元素）。
那么是否有一个通用的数据结构（动态数组）可供两者或其他方式使用？我正在使用 Visual studio 2010。
我想做这样的事情。
PS：不是编译的代码，这里我使用 char 数组而不是 int 数组。
C# 代码
[DllImport("example1.dll")]
private static extern int fnCPP (StringBuilder a,int size)
...
private void fnCSHARP(){
StringBuilder buff = new StringBuilder(10000);
int size=0;
size = fnCPP (buff,size);
int x = someCSHARP_fu();
for ( int i=size; i < x+size; i++) buff[i]='x';// possibility of run time error
}
C++ 代码
int fnCPP (char *a,int size){
int x = someOtherCpp_Function();
for( int i=size; i < x+size ; i++) a[ i ] = 'x'; //possibility of run time error
return size+x;
}
I have a C# project which is using a C++ dll. (in visual studio 2010)
I have to pass a array of int from C# code to C++ function and C++ function will add few elements in array, when control comes back to C# code, C# code will also add elements in same array.
Initially i declared a array(of size 10000) in C# code and C++ code is able to add elements (because it was just an array of int, memory allocation is same), but the problems is i have got run time error due to accessing out side of array.
I can increase size to 100000 but again i don't know how much elements C++ code will add( even it can be just 1 element).
So is there a common data structure (dynamic array) exist for both or other way to do? I am using Visual studio 2010.
Something like this i want to do.
PS: not compiled code, and here i used char array instead of int array.
C# code
[DllImport("example1.dll")]
private static extern int fnCPP (StringBuilder a,int size)
...
private void fnCSHARP(){
StringBuilder buff = new StringBuilder(10000);
int size=0;
size = fnCPP (buff,size);
int x = someCSHARP_fu();
for ( int i=size; i < x+size; i++) buff[i]='x';// possibility of run time error
}
C++ code
int fnCPP (char *a,int size){
int x = someOtherCpp_Function();
for( int i=size; i < x+size ; i++) a[ i ] = 'x'; //possibility of run time error
return size+x;
}
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此处有一篇关于在托管和非托管代码之间传递数组的很好的 MSDN 文章。问题是，为什么首先需要将数组从 C# 传递到 C++？为什么不能在 C++ 端（在 fnCPP 方法中）进行分配，并返回指向 C# 代码的指针，而不仅仅是使用
Marshal.Copy( source, destination, 0, size )如另一个 Stackoverflow 问题 ？与 fnCSHARP 方法相比，您可以将数组的内容复制到某些可变长度的数据结构（例如列表）。There's a good MSDN article about passing arrays between managed and unmanaged code Here. The question is, why would you need to pass the array from C# to C++ in the first place? Why can't you do the allocation on the C++ side (in your fnCPP method), and return a pointer to the C# code, and than just use
Marshal.Copy( source, destination, 0, size )as in yet another Stackoverflow question? Than in your fnCSHARP method you could copy the contents of the array to some varaiable length data structure (e.g. List).