[英]Python ctypes - dll function accepting structures crashes
I have to access a POS terminal under ms windows xp.我必须在 ms windows xp 下访问 POS 终端。 I am using python 2.7.我正在使用 python 2.7。 The crucial function in the DLL I load that does the payment accepts two pointer to structures, but it crashes returning 1 (Communication error) but without further messages.我加载的 DLL 中执行支付的关键函数接受两个指向结构的指针,但它崩溃返回 1(通信错误)但没有进一步的消息。 Please note that when the payment function is called, not all the elements of POSData structure receive a value.请注意,调用支付功能时,并非 POSData 结构的所有元素都会收到一个值。 Other function I tried (GetVersion) does work.我试过的其他功能 (GetVersion) 确实有效。 Here specifications and my code: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
c_char_p
is a direct translation of a C's char *
. c_char_p
是 C 的char *
的直接翻译。 So, it seems to me that while your C structure is所以,在我看来,虽然你的 C 结构是
typedef struct
{
char TerminalId[8+1];
char AcquirerId[11+1];
char TransactionType[3+1];
&c
the allegedly-corresponding one you're making in ctypes is, instead, equivalent to您在 ctypes 中制作的据称对应的对应于
typedef struct
{
char* TerminalId;
char* AcquirerId;
char* TransactionType;
&c
which is of course a drastically different thing.这当然是完全不同的事情。 Why are you using "pointers" instead of ctypes' arrays ?你为什么使用“指针”而不是 ctypes 的数组?
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