long WINAPI AutoOpenComPort(long Port, unsigned char *ComAdr, unsigned char * Baud ,long FrmHandle);
以上的api在PB中是这样声明的吗?
FUNCTION long AutoOpenComPort(long Port, ref string ComAdr, ref string Baud ,long FrmHandle) LIBRARY "ZK_RFID105.dll" ALIAS FOR "AutoOpenComPort;Ansi" ;
------解决方案--------------------

貌似是这样的你参考下!