我必须访问ms windows xp下的POS终端。我正在使用python 2.7。 我负载的DLL中的关键功能是支付接受两个结构指针,但它崩溃返回1(通信错误)但没有进一步的消息。 请注意,调用支付函数时,并非POSData结构的所有元素都会收到值。我尝试的其他功能(GetVersion)确实有效。 这里的规格和我的代码:
typedef struct
{
char IPAddress[16]; //xxx.xxx.xxx.xxx
int Port;
} TETHParameters;
typedef struct
{
char TerminalId[8+1];
char AcquirerId[11+1];
char TransactionType[3+1];
char TransactionResult[2+1];
char KODescription[24+1];
char CardType[1+1];
char STAN[6+1];
char PAN[19+1];
char AuthorizationCode[6+1];
char OperationNumber[6+1];
char DataTrs[7+1];
} TPOSData;
typedef struct
{
char Amount[8+1];
char ECRId[8+1];
char PaymentType[1+1];
char TerminalId[8+1];
} TECRData;
__declspec(dllexport) void IAE17_GetVersion(char *Version);
__declspec(dllexport) void IAE17_InitEth(TETHParameters *ETHParameters);
__declspec(dllexport) void IAE17_Free(void);
__declspec(dllexport) int IAE17_Payment(TECRData *ECRData, TPOSData *POSData);
from ctypes import *
#da python 3.x sara' configparser
import ConfigParser
import logging
from time import localtime, strftime
#STRUTTURE DATI
class TETHParameters(Structure):
_fields_ = [("IPAddress" , c_char_p), ("Port" , c_int )]
class TECRData(Structure):
_fields_ = [("Amount" , c_char_p),
("ECRId", c_char_p),
("PaymentType", c_char_p),
("TerminalId", c_char_p),
("Contract", c_char_p),
("PreauthorizationCode", c_char_p),
("STAN", c_char_p),
("Ticket2Ecr", c_char_p)]
class TPOSData(Structure):
_fields_ = [
("TerminalId" , c_char_p),
("AcquirerId" , c_char_p),
("TransactionType" , c_char_p),
("TransactionResult" , c_char_p),
("KODescription" , c_char_p),
("CardType" , c_char_p),
("STAN" , c_char_p),
("POSBalance" , c_char_p),
("BankBalance" , c_char_p),
("PAN" , c_char_p),
("AuthorizationCode" , c_char_p),
("OperationNumber" , c_char_p),
("AmountAuth" , c_char_p),
("PreauthorizationCode" , c_char_p),
("ActionCode" , c_char_p),
("DataTrs" , c_char_p),
("AmountEcho" , c_char_p),
("Ticket" , c_char_p)
]
ECRData = TECRData( ECRId = c_char_p( '012345678' ),
Amount = c_char_p( '00000000') ,
TerminalID = c_char_p( '01234567' ),
PaymentType = c_char_p ("0")
)
POSData = TPOSData( KODescription = c_char_p(' '),
TerminalId = c_char_p(' '),
AcquirerId = c_char_p(' '),
TransactionType = c_char_p(' '),
TransactionResult = c_char_p(' '),
CardType = c_char_p(' '),
STAN = c_char_p(' '),
PAN = c_char_p(' '),
AuthorizationCode = c_char_p(' '),
OperationNumber = c_char_p(' '),
DataTrs = c_char_p(' ')
)
ETHParameters = TETHParameters( IPAddress = c_char_p( '192.168.127.190' ) , Port = c_int(45119))
iae17 = windll.LoadLibrary('iae17')
iae17.IAE17_InitEth( byref( ETHParameters) )
result = iae17.IAE17_Payment( byref(ECRData), byref(POSData))
print result
答案 0 :(得分:5)
c_char_p
是C char *
的直接翻译。所以,在我看来,你的C结构是
typedef struct
{
char TerminalId[8+1];
char AcquirerId[11+1];
char TransactionType[3+1];
&c
相反,你在ctypes中所谓的相应的一个相当于
typedef struct
{
char* TerminalId;
char* AcquirerId;
char* TransactionType;
&c
这当然是一个截然不同的事情。为什么使用“指针”代替ctypes'arrays?我不明白 - 提前谢谢澄清!