利用自定义消息（MFC界面）实现进程间通讯

来源：互联网发布：linux下sleep 的用法编辑：程序博客网时间：2024/05/22 13:26

使用了操作系统的消息队列，所以可以做到进程32位，64位通用！但是同样受限于此，只能做到四个字节（或者八个字节）的数字数据通讯！

//server.cpp#include <windows.h>#include "resource.h"INT_PTR CALLBACK DialogProcedure(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam);BOOL OnInitDialog(HWND DlgHwnd);#define  UM_IPC WM_USER+1HWND __DlgHwnd = NULL;HWND __EditHwnd = NULL;char __BufferData[4] = { 0 };int APIENTRY wWinMain(_In_ HINSTANCE hInstance,_In_opt_ HINSTANCE hPrevInstance,_In_ LPWSTR    lpCmdLine,_In_ int       nCmdShow){//入口函数DialogBox(hInstance,MAKEINTRESOURCE(IDD_DIALOG_MAIN),NULL,DialogProcedure);return 0;}INT_PTR CALLBACK DialogProcedure(HWND hwndDlg,UINT uMsg,WPARAM wParam, LPARAM lParam){switch (uMsg){case WM_COMMAND:{switch (LOWORD(wParam)){case IDOK:{GetWindowTextA(__EditHwnd, __BufferData, 5);//从__EditHwnd向__BufferData上最多拷贝5个字节including the null character！ULONG32 ParameterData = 0;ParameterData = atoi(__BufferData);SendMessage(__DlgHwnd, UM_IPC, (WPARAM)ParameterData, NULL);break;}default:break;}break;}case WM_INITDIALOG:{OnInitDialog(hwndDlg);break;}case WM_CLOSE:{EndDialog(hwndDlg, 0);break;}default:break;}return 0;}BOOL OnInitDialog(HWND DlgHwnd){__DlgHwnd = FindWindow(NULL, L"Client");if (__DlgHwnd==NULL){return FALSE;}__EditHwnd = GetDlgItem(DlgHwnd, IDC_EDIT_MAIN);if (__EditHwnd==NULL){return FALSE;}return TRUE;}

//client.cpp#include <windows.h>#include "resource.h"//(能成功是因为server都向Clent只传四个字节)INT_PTR CALLBACK DialogProcedure(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam);BOOL OnInitDialog(HWND DlgHwnd);#define UM_IPC WM_USER+1HWND __EditHwnd = NULL;char __BufferData[4] = { 0 };int APIENTRY wWinMain(_In_ HINSTANCE hInstance,_In_opt_ HINSTANCE hPrevInstance,_In_ LPWSTR    lpCmdLine,_In_ int       nCmdShow){DialogBox(hInstance,MAKEINTRESOURCE(IDD_DIALOG_MAIN),NULL,DialogProcedure);return 0;}INT_PTR CALLBACK DialogProcedure(HWND hwndDlg,  UINT uMsg,WPARAM wParam, LPARAM lParam){switch (uMsg){case WM_INITDIALOG:{OnInitDialog(hwndDlg);break;}case WM_COMMAND:{switch (LOWORD(wParam)){case IDOK:{int a = 0;break;}default:break;}break;}case WM_CLOSE:{EndDialog(hwndDlg, 0);break;}case UM_IPC:{itoa((int)wParam, __BufferData, 10);SetWindowTextA(__EditHwnd, __BufferData);break;}default:break;}return 0;}BOOL OnInitDialog(HWND DlgHwnd){__EditHwnd = GetDlgItem(DlgHwnd, IDC_EDIT_MAIN);if (__EditHwnd == NULL){return FALSE;}return TRUE;}

注:

1.由于Server中需要使用FindWindow函数来找到Client的窗口，所以需要先启动Client段端程序！

2.本程序只是用了W参传递，只能传递4个字节的数字数据！（支持负数）

3.最后的程序在32位，64位间可以互相通讯!

4.程序使用的界面只是两个editMFC控件,

如果Server传递非数字数据，Client会显示0:这是由于转换函数itoa失败时返回0.

如果Server传递数据多于四个，Client只会显示前四个数据而不会崩溃，这是因为GetWindowTextA函数只会拷贝前四个数据。

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