[英]Typecasting to a struct after python embedding
I have a small python script embedded in a C++ program. 我在C ++程序中嵌入了一个小的python脚本。 After exposing the python object to C++ program and copying the value to a C++ variable, i try to typecast it to a struct, but i do not get the expected value.
将python对象暴露给C ++程序并将值复制到C ++变量后,我尝试将其类型转换为结构,但是我没有获得预期的值。 What is wrong here?] I am using python for socket programming to send data from one system to another.
这里出了什么问题?]我正在使用python进行套接字编程,以将数据从一个系统发送到另一个系统。
The code looks like this. 代码看起来像这样。
#include
#include
struct overhead{
uchar8 flags;
uint16 seqNo, timeDiff, threshold, length;
};
struct payload{
float forceX,forceY,forceZ,positionX,positionY,positionZ;
};
struct packet{
overhead fields;
payload data;
};
const char * msg;
int main(){
packet pack;
/* assign values to members of packet
pack.fields.threshold =
pack.data.forceZ = */
msg = (const char *) &pack;
PyObject *PyMain = PyImport_AddModule("__main__");
PyObject *globals = PyModule_GetDict(PyMain);
PyObject *string = PyString_FromString(msg);
PyDict_SetItemString(globals, "send", string);
const char* sendPy = "UDPSock.sendto(send,('10.107.35.167',2000))";
PyRun_SimpleString(sendPy);
PyObject *temp = PyDict_GetItemString(globals, "send");
const char* x = PyString_AsString(temp);
packet *pa = (packet *) x;
cout << pa->data.forceZ << endl;
}
But the output is not the same as the value assigned. 但是输出与分配的值不同。 Can anybody explain what is wrong?
谁能解释什么是错的?
Thanks in advance. 提前致谢。
PyString_FromString
assumes the passed string is terminated with a null byte like any normal C string. PyString_FromString
假定传递的字符串以空字节结尾,就像任何普通的C字符串一样。 Your struct probably contains a null byte in it somewhere. 您的结构可能在某处包含一个空字节。 Use
PyString_FromStringAndSize
instead, which does not have that assumption. 请改用
PyString_FromStringAndSize
,它没有该假设。
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