C#:将数组的字符串传递给C ++ DLL [英] C#: passing array of strings to a C++ DLL

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问题描述

我正在尝试将一个数组中的一些字符串传递给我的C ++ DLL。



C ++ DLL的功能是:

  externC_declspec(dllexport)void printnames(char ** ppNames,int iNbOfNames)
{
for(int iName = 0; iName< iNbOfNames; iName ++)
{
OutputDebugStringA(ppNames [iName]);
}
}

在C#中,我加载了这样的功能:

  [DllImport(MyDLL.dll,CallingConvention = CallingConvention.StdCall)] 
static extern void printnames(StringBuilder [] astr,int size);< br>

然后我设置/调用这样的功能:

 列表< string> names = new List< string>(); 
names.Add(first);
names.Add(second);
names.Add(third);

StringBuilder [] astr = new StringBuilder [20];
astr [0] = new StringBuilder();
astr [1] = new StringBuilder();
astr [2] = new StringBuilder();
astr [0] .Append(names [0]);
astr [1] .Append(names [1]);
astr [2] .Append(names [2]);

printnames(astr,3);

使用DbgView,我可以看到一些数据被传递给DLL,但它正在打印出垃圾第一,第二和第三。



任何线索?

解决方案

使用String []代替StringBuilder []:

  [DllImport(MyDLL.dll ,CallingConvention = CallingConvention.StdCall)] 
static extern void printnames(String [] astr,int size);

列表< string> names = new List< string>();
names.Add(first);
names.Add(second);
names.Add(third);

printnames(names.ToArray(),names.Count);

MSDN有更多信息在封送阵列上。


I'm trying to pass some strings in an array to my C++ DLL.

The C++ DLL's function is:

extern "C" _declspec(dllexport) void printnames(char** ppNames, int iNbOfNames)
{
    for(int iName=0; iName < iNbOfNames; iName++)
    {
        OutputDebugStringA(ppNames[iName]);
    }
}

And in C#, I load the function like this:

[DllImport("MyDLL.dll", CallingConvention = CallingConvention.StdCall)]
static extern void printnames(StringBuilder[] astr, int size);<br>

Then I setup/call the function like so:

List<string> names = new List<string>();
names.Add("first");
names.Add("second");
names.Add("third");

StringBuilder[] astr = new StringBuilder[20];
astr[0] = new StringBuilder();
astr[1] = new StringBuilder();
astr[2] = new StringBuilder();
astr[0].Append(names[0]);
astr[1].Append(names[1]);
astr[2].Append(names[2]);

printnames(astr, 3);

Using DbgView, I can see that some data is passed to the DLL, but it's printing out garbage instead of "first", "second" and "third".

Any clues?

解决方案

Use String[] instead of StringBuilder[]:

[DllImport("MyDLL.dll", CallingConvention = CallingConvention.StdCall)]
static extern void printnames(String[] astr, int size);

List<string> names = new List<string>();
names.Add("first");
names.Add("second");
names.Add("third");

printnames(names.ToArray(), names.Count);

MSDN has more info on marshaling arrays.

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