C++转换C#后如何使用

[qilinzd]

Get Barcode data and type from system buffer.

BOOL PT_GetBarcodeData
{
UINT * uiBarType, 
Char * pBuffer, 
UINT * uiMaxBufferLen
}

Parameters:
uiBarType [out] barcode type.
pBuffer [out] buffer for storing scanned data.
uiMaxBufferLen [in/out] The max buffer size Return Values Return TRUE if the operation is successful, otherwise return FALSE.

Remarks If the buffer size is less than scan data, function return 0 and the parameter uiMaxBufferLen return the size of barcode data.

Example:

if(PT_CheckBarcodeData())
{
if(PT_GetBarcodeData(&uiBarType, pBarData, &uiMaxLen))
{
for(i = 0 ; i < strlen(pBarData) ; i++)
m_strScanData += *(pBarData + i);
}
else m_strScanData = _T("Can't get scan data");
}
else m_strScanData = _T("No Scan Data"); 

关于PT60扫描枪C++代码，网上查了资料转，有个换成C#代码的版本：

[DllImport("scanapiax.dll", EntryPoint = "PT_GetBarcodeData")]
public static extern bool PT_GetBarcodeData(ref uint uiBarType, byte[] pBuffer, ref uint uiMaxBufferLen);

应该是返回扫描枪扫描的数据，不知道怎么用，怎么调用。
ref uint uiBarType, byte[] pBuffer, ref uint uiMaxBufferLen 这参数也看不明白，是如何返回值的。
求各位高手帮忙。

[qilinzd]

PT_GetBarcodeData(ref uint uiBarType, byte[] pBuffer, ref uint uiMaxBufferLen);
该怎么用啊？

[CqCoder]

http://www.cnblogs.com/hwh_/archive/2010/11/16/1878341.html

[WAN]

            uint uiBarType = uint.MaxValue;
            byte[] buffer = new byte[50];
            uint uiMaxBufferLen = (uint)buffer.Length;

            bool bSuccess = PT_GetBarcodeData(ref uiBarType, buffer, ref uiMaxBufferLen);

            if (bSuccess)
            {
                Console.Write("成功！条码类型为：{0}，扫描数据为：", uiBarType);
                foreach (byte ch in buffer)
                {
                    if (ch == 0)    //零表示结束
                        break;
                    Console.Write(" {0}", ch);
                }
            }
            else
            {
                Console.Write("失败！需要的缓冲区长度为：{0}字节", uiMaxBufferLen);
            }

[bdmh]

ref就是引用传递，函数中可以对这个参数进行修改的，这样后续代码可以继续访问新的值

[EnForGrass]

[Quote=引用楼主 的回复:]
Get Barcode data and type from system buffer.
C/C++ code

BOOL PT_GetBarcodeData
{
UINT * uiBarType,
Char * pBuffer,
UINT * uiMaxBufferLen
}



Parameters:
uiBarType [out] barcode type.
pBuff……
[/Quote]
自己看啊，C#调用C++dll的参数对应以及转换
http://blog.csdn.net/sunboyljp/article/details/5110639