c# - 将字符指针从 C# 传递到 C++ 函数

Question

我被困在 C# 实现方面，因为我对它还很陌生。问题是，我想从 c# 代码传递一个“指针”(具有内存)，以便我的 c++ 应用程序可以将 pchListSoftwares 缓冲区复制到 pchInstalledSoftwares。我无法弄清楚如何从 C# 端传递指针。

原生c++代码(MyNativeC++DLL.dll)

void GetInstalledSoftwares(char* pchInstalledSoftwares){
    char* pchListSoftwares = NULL; 
    .....
    .....
    pchListSoftwares = (char*) malloc(255);

    /* code to fill pchListSoftwares buffer*/

    memcpy(pchInstalledSoftwares, pchListSoftwares, 255);

    free(pchListSoftwares );

}

传递简单的“字符串”是行不通的...

C#实现

[DllImport("MyNativeC++DLL.dll")]
private static extern int GetInstalledSoftwares(string pchInstalledSoftwares);


static void Main(string[] args)
{
.........
.........
        string b = "";
        GetInstalledSoftwares(0, b);
        MessageBox.Show(b.ToString());
}

非常感谢任何形式的帮助...

Answer 1

尝试使用 StringBuilder

[DllImport("MyNativeC++DLL.dll")]
private static extern int GetInstalledSoftwares(StringBuilder pchInstalledSoftwares);


static void Main(string[] args)
{
.........
.........
        StringBuilder b = new StringBuilder(255);
        GetInstalledSoftwares(0, b);
        MessageBox.Show(b.ToString());
}