python调用c++传递数组

INPUT = c_int * 4
# 实例化一个长度为2的整型数组
input = INPUT()
# 为数组赋值（input这个数组是不支持迭代的）
input[0] = 11
input[1] = 2
input[2] = 3
input[3] = 4
dll.teststring.restype = c_char_p
# bytes(aaaa, encoding="utf-8")
a = dll.teststring(input,4)

MYLIBDLL char* teststring(int* plus1, int len);

char* teststring(int* plus1,int len) {


for (int i = 0; i < len; i++) {
printf("%d \n", plus1[i]);
} 




Mat mat;
//加载图片  
mat = imread("bgs.jpg", CV_LOAD_IMAGE_COLOR);
printf("a %d %d", mat.rows, mat.cols);
//if (!mat.empty()) {


int m, n;
n = mat.cols * 3;
m = mat.rows;
unsigned char *data = (unsigned char*)malloc(sizeof(unsigned char) * m * n);
int p = 0;
for (int i = 0; i < m; i++)
{
for (int j = 0; j < n; j++)
{
data[p] = mat.at(i, j);
p++;
}
}
*plus1 = p;
return (char*)data;
}