[英]IPC between a C DLL and Python application to process data
我想將消息結構從 DLL 回調函數發送到 python 應用程序,以便我可以記錄消息。
為此,我想使用 ZeroMQ。 遺憾的是,我無法使用 ZeroMQ 提供的示例將消息發送到 python。
動態鏈接庫:
// dllmain.cpp : Defines the entry point for the DLL application.
#include "pch.h"
#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <zmq.h>
HHOOK tHook;
HMODULE hinstDLL;
void* requester;
void* context;
LRESULT CALLBACK meconnect(int code, WPARAM wParam, LPARAM lParam) {
if (code == HC_ACTION) {
LPMSG data = (LPMSG)lParam;
UINT message = data->message;
switch (message)
{
case WM_POINTERUPDATE:
if (!IS_POINTER_INCONTACT_WPARAM(wParam))
break;
case WM_POINTERDOWN:
case WM_POINTERUP:
POINTER_INFO pointerInfo = {};
GetPointerInfo(GET_POINTERID_WPARAM(wParam), &pointerInfo);
int request_nbr;
for (request_nbr = 0; request_nbr != 10; request_nbr++) {
char buffer[10];
printf("Sending Hello %d…\n", request_nbr);
zmq_send(requester, data, 5, 0);
zmq_recv(requester, buffer, 10, 0);
printf("Received World %d\n", request_nbr);
}
}
}
return(CallNextHookEx(tHook, code, wParam, lParam));
}
extern "C" __declspec(dllexport) BOOL ConnectServer() {
printf("Connecting to hello world server…\n");
static void* context = zmq_ctx_new();
static void* requester = zmq_socket(context, ZMQ_REQ);
zmq_connect(requester, "tcp://127.0.0.1:5555");
printf("connected");
return TRUE;
}
extern "C" __declspec(dllexport) BOOL DisconnectServer() {
zmq_close(requester);
zmq_ctx_destroy(context);
return TRUE;
}
extern "C" __declspec(dllexport) BOOL SetHook()
{
tHook = SetWindowsHookEx(WH_GETMESSAGE, meconnect, hinstDLL, 0);
if (tHook == NULL)
return FALSE;
else
return TRUE;
}
extern "C" __declspec(dllexport) BOOL UnHook()
{
return UnhookWindowsHookEx(tHook);
}
BOOL APIENTRY DllMain(HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
hinstDLL = hModule;
break;
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
Python:
context = zmq.Context()
socket = context.socket(zmq.REP)
socket.bind("tcp://127.0.0.1:5555")
def message_msg_loop():
while True:
# Wait for next request from client
message = socket.recv()
print("Received request: %s" % message)
# Do some 'work'
time.sleep(1)
# Send reply back to client
socket.send(b"World")
def pointer_msg_loop():
global lib
lib = cdll.LoadLibrary(r'C:\Users\Braun\Documents\BA_Thesis\ba-oliver-braun-logging-tool-code\MessagesDll\x64\Release\HOOKDLL.dll')
print(lib)
res = lib.ConnectServer()
res = lib.SetHook()
pythoncom.PumpMessages()
res = lib.UnHook()
基本上我的計划是通過 Windows 消息檢測某個事件,並將消息結構從 DLL 回調傳遞到 Python 中的服務器,這樣我就可以處理那里的數據並將它們放入日志文件中。 雖然它似乎不起作用。
如果從未使用過 ZeroMQ,
在這里可以先看看“不到五秒的ZeroMQ原則”
在深入了解更多細節之前
最好避免所有的復雜性:
- set .setsockopt( zmq.LINGER, 0 ) # ALWAYS
,永遠不知道哪個版本會嘗試加入俱樂部
- 帶有PUSH/PULL
原型(它 a)符合規范。+b)不會像所有REQ/REP
那樣阻塞在相互死鎖中) -從不共享套接字(是的, requester
應該是一個私有的、非共享的實例)
-始終讀入和assert
-評估來自 ZeroMQ API 調用的返回碼(現場檢測許多問題)
你能 POSACK/證明這兩個模塊級聲明嗎
...
void* requester;
void* context;
LRESULT CALLBACK meconnect(...) {...}
...
實際上按預期工作,還是ConnectServer(){...}
的內部范圍內聲明屏蔽了這兩個全局變量?
extern "C" __declspec(dllexport) BOOL ConnectServer() {
printf("Connecting to hello world server…\n");
static void* context = zmq_ctx_new(); // shadows out void* context
static void* requester = zmq_socket(context, ZMQ_REQ); // shadows out void* requester
zmq_connect(requester, "tcp://127.0.0.1:5555");
printf("connected");
return TRUE;
}
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