Question

我正在尝试导入一个C函数，它返回缓冲区地址（unsgined char *）。 Python是否可以采用POINTER（c_ubyte）来访问dll中分配的内存没有在Python中执行任何额外的内存复制或分配移动？似乎没有必要通过Python重新分配这样的内存空间，因为它已经存在由导入的* .dll。

创建

以下是dll文件中的简化C代码：

static char gp_huge_buffer[1024][1024];
unsigned char *GetBufferAddress(void){
     //This function will modify gp_huge_buffer data for Python
     return (unsigned char *)gp_huge_buffer;
}

我的Python脚本：

import ctypes
mydll = ctypes.cdll.LoadLibrary('my dll path')
mydll.GetBufferAddress.argtypes = []
mydll.GetBufferAddress.restype = ctypes.POINTER(ctypes.c_ubyte)

# Maybe doing something as blow .... I don't know ???
p_ubyte = mydll.GetBufferAddress() 
bytes_from_dll = byte_array.from_address(p_ubyte)  

# No additional memory allocation by Python, just transform bytes_from_dll to data_from_dll?

data_from_dll = SomeTypeCast(bytes_from_dll)

with open('file.dat', 'r') as fd
    data_from_fd = fd.Read()

    if data_from_dll == data_from_fd :
        print("I need to compare the two group of huge binary data")
        print("Especially one is in file.dat and the other is in *.dll")

ctypes是否可以访问在* .dll中分配的缓冲区地址（例如，POINTER（c_ubyte）中的C函数返回地址？）

0 个答案: