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编组字符数组。C#pinvoke C字符数组
的风格函数的C类型定义是:
typedef bool (*get_VariableInfoFunc)(int *, char * *, int *, int *);
它`用法是这样的:
pnVariableIdArray = new (nothrow) int[numVars];
pcVariableName = new (nothrow) char*[numVars];
for (int i = 0; i < numVars; i++)
{
pcVariableName[i] = new char[100];
}
pnUnVariableIdArray = new (nothrow) int[numVars];
pnVariableType = new (nothrow) int[numVars];
res = get_VariableInfo(pnVariableIdArray, pcVariableName, pnUnVariableIdArray, pnVariableType);
我的C#签名是:
[DllImport(AUTODYNResultsApiDll, EntryPoint = "get_VariableInfo", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetVariableInfo(
int[] pnVariableIdArray,
IntPtr[] pcVariableName,
int[] pnUnVariableIdArray,
int[] pnVariableType);
我用它喜欢:
var stringPointers= new IntPtr[numVars];
for (int i = 0; i < numVars; i++)
{
by[i] = Marshal.AllocHGlobal(100);
}
GetVariableInfo(pnVariableIdArray, stringPointers, pnUnVariableIdArray, pnVariableType);
,然后回到字符串:
var strings = new string[numVars];
for (int i = 0; i < numVars; i++)
{
strings[i] = Marshal.PtrToStringAnsi(by[i]);
}
有没有一种更好的方式做这个而不释放指针的内存。只需将字符串数组作为字符串数组复制?