C#调用WinAPI

[windxx]

请问比如我想调用如下的WinAPI
GetLogicalDriveStrings(DWORD nBufferLength,LPTSTR lpBuffer);
我看GetLogicalDriveStrings的解释，如果调用成功，会返回驱动器名称的若干个字符串,我在C#中进行如下调用：

        [DllImport("Kernel32")]
        public static extern int GetLogicalDriveStrings(int nBufferLength, string lpBuffer);
        string str = "";
        MessageBox.Show(GetLogicalDriveStrings(125, str).ToString());
        MessageBox.Show(str);

结果GetLogicalDriveStrings返回32，str = ""，应该是调用有问题，请问有人知道正确的调用方法么？谢谢

[ivorstar]

没有返回0，说明调用成功，试试out string lpBuffer
或者参考
http://www.pinvoke.net/search.aspx?search=GetLogicalDriveStrings&namespace=[All]

// static extern uint GetLogicalDriveStrings(uint nBufferLength,
static extern uint GetLogicalDriveStrings(uint nBufferLength, [Out] char[] lpBuffer);
static extern uint GetLogicalDriveStrings(uint nBufferLength, [Out] char[] lpBuffer);
uint code = GetLogicalDriveStrings(size, buffer);

[windxx]

谢谢，得到结果了。

[人到中年琐事多]

StringBuilder sb = new StringBuilder(256);//指定容量
GetLogicalDriveStrings(sb.Capacity, sb);
MessageBox.Show(sb.ToString());

这是MSDN推荐的标准方法

[fongye365]

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