Ctypes调用DLL

Ctypes调用DLL Ctypes调用DLL 0、dll的加载

class testDll(object):
    def __init__(self):
		self.dll = CDLL("testa.dll")

1、python传入指针,DLL将指针赋值,传回python: 1.1python部分代码:

def transToHexFromBytearray(dataarray):
    '''从bytearray转换成HEX'''
    return "".join(["%.2X" % c for c in dataarray])


def transToBytearrayFromHex(hexStr, length=None):
    '''从HEX字符串转换成bytearray'''
    return bytes.fromhex(hexStr)

def testa(self,testInt, testStr):
     testStr = transToBytearrayFromHex(testStr)#输入
     returnInt = c_int()  #返回
     returnData = create_string_buffer(256) #创建返回固定大小的字符缓存
     ret = self.dll.TransferChannel(testStr, testInt, byref(returnInt),byref(returnData))
     return ret, returnInt, transToHexFromBytearray(returnData.raw)

1.2C语言接口代码:

extern "C" testa int testa(char *testStr, int testInt, int &returnInt, char *returnData);

1.3调用:

#1.加载dll
testDll=testDll()
#调用方法
ret, returnInt,returnData=tstDll.testa(1,"AABBCC")

2.传入空结构体并返回

2.1python部分代码:

	class OemInfo(Structure):
    _fields_ = [("oemId", c_char * 21),
                ("carType", c_char * 2)]
    
    def getOemList(self):
        msg = create_string_buffer(128)
        lens = c_int(1)
        oemInfo1 = OemInfo()  # 初始化结构体
        ret = self.dll.testStructure(byref(oemInfo1), byref(lens), byref(msg))
        if (ret != 0):
            print(str(msg.value))
            return ret, None, None, None
        return ret, oemInfo1, lens, msg

2.2C语言接口代码:

typedef struct	_tag_OEM_INFO
{ 
	char oemId[21];
	char carType[2];
}OemInfo;

extern  "C" testa int testStructure(OemInfo  *arrOem,   int &len, char* msg);