VB6 / C ++ WINAPI到C＃

Question

我正在使用一些具有DLL的硬件。 我相信它有两种方法来调用该功能（通过使用DLL间谍应用程序）。

目前，它可以在VB6中使用

Public Type Versions
   Pname As Long
   Manuf As Long
   VMajor As Long
   VMinor As Long
   VState As Long
End Type

Public Declare Function FLASH_GetVersion Lib "C:\flash_cntrl.dll" (ByVal fxc_Versions As Long) As Integer

Dim vVers As Versions
Dim strProdName As String
Dim strManuf As String

strProdName = "                                                                                              "
strManuf = "                                                                                              "

vVers.Manuf = StrPtr(strManuf)
vVers.Pname = StrPtr(strProdName)

iReturn = FLASH_GetVersion(VarPtr(vVers))

我被迫转到C＃2008/2010，以便能够使用VB6不支持的其他一些硬件。

因此，我试图使用以上内容并AccessViolationException错误。 我足够“幸运”，可以拥有带有WinAPI定义的C ++头文件，但仍然很费劲。 任何帮助将非常感激。

 typedef struct {
 LPWSTR productname;
 LPWSTR manufacturer;
 unsigned Vers_Major;
 unsigned Vers_Minor;
 unsigned Vers_State;      // = 0 released, > 0 internal use only
} FLASH_INFO;

int WINAPI FLASH_GetVersion  (FLASH_INFO *fxc_Version);

到目前为止，我的C＃是

static class NativeMethods
{
    [DllImport("C:\\flash_cntrl.dll")]
    public static extern short FLASH_GetVersion(FLASH_INFO vVers);
}

public class FLASH_INFO
{
    public string productname;
    public string manufacturer;
    public int Vers_Major;
    public int Vers_Minor;
    public int Vers_State;
}

        FLASH_INFO vers = new FLASH_INFO();

        string strManuf = "                                ";
        string strProdName = "                                ";

        vers.productname = strProdName;
        vers.manufacturer = strManuf;
        vers.Vers_Major = 0;
        vers.Vers_Minor = 0;
        vers.Vers_State = 0;

        short sRet = NativeMethods.FLASH_GetVersion(vers);

        Console.WriteLine("{0}|{1}", "sRet", sRet.ToString());

这可能很简单，但是我对C＃语言还是比较陌生（只做过一些桌面编程和Silverlight）。

先感谢您

Answer 1

字符串strManuf =“”; 字符串strProdName =“”;

vers.productname = strProdName; 
vers.manufacturer = strManuf; 

问题出在那些方面。 它们的c ++结构类型是LPWSTR，它转换为.net中的IntPtr，后者是指向对象的指针。

Answer 2

字符串的默认封送处理为8位字符，但是LPWSTR是Unicode字符串。 返回类型也不正确。 固定：

[DllImport("C:\\flash_cntrl.dll")]
public static extern int FLASH_GetVersion(ref FLASH_INFO vVers);

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)
public struct FLASH_INFO
{
    public string productname;
    public string manufacturer;
    public int Vers_Major;
    public int Vers_Minor;
    public int Vers_State;
}