python调用dll

调用CALLBACK标记的dll方法要用dll = ctypes.windll.LoadLibrary( 'test.dll' )

没有CALLBACK的方法用dll = ctypes.cdll.LoadLibrary( 'test.dll' )

例子：

from ctypes import *
d2d = cdll.LoadLibrary("Direct2dDll.dll")
print(d2d.DCreateWindow)

CALLBACK = CFUNCTYPE(c_int,c_int)

def py_cmp_func(a):
print(str(a))
return 0;

callBackFunc = CALLBACK(py_cmp_func)

d2d.SetCallBack(callBackFunc)
d2d.DCreateWindow()

// Direct2dDll.cpp : 定义 DLL 应用程序的导出函数。
//

#include "stdafx.h"
#include <Windows.h>
#include <stdio.h>
#include "Draw.h"

int (*CallBack)(int);

void SetCallBack(int (*fun)(int))
{
(*fun)(0);
CallBack = fun;
}

//
//  函数: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  目的: 处理主窗口的消息。
//
//  WM_COMMAND    - 处理应用程序菜单
//  WM_PAINT    - 绘制主窗口
//  WM_DESTROY    - 发送退出消息并返回
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
(*CallBack)((int)message);
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;

switch (message)
{
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// TODO: 在此添加任意绘图代码...
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

HWND DCreateWindow()
{
HINSTANCE instance = GetModuleHandle(0);

TCHAR szWindowClass[] = L"pw";            // 主窗口类名

WNDCLASSEX wcex;

wcex.cbSize = sizeof(WNDCLASSEX);
printf("2");
wcex.style            = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc    = WndProc;
wcex.cbClsExtra        = 0;
wcex.cbWndExtra        = 0;
wcex.hInstance        = instance;
wcex.hIcon            = 0;//LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WIN32PROJECT1));
wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground    = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName    = 0;//MAKEINTRESOURCE(IDC_WIN32PROJECT1);
wcex.lpszClassName    = szWindowClass;
wcex.hIconSm        = 0;//LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

RegisterClassEx(&wcex);
printf("3");
HWND hWnd = CreateWindow(szWindowClass, L"title", WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, instance, NULL);
printf("4");
ShowWindow(hWnd, SW_MAXIMIZE);
UpdateWindow(hWnd);

MSG msg;
// 主消息循环:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, 0, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

return hWnd;
}