win32

仅适用于同一台电脑的两个进程聊天，对于不同电脑之前的聊天需要依靠tcp/ip协议。

两个进程是通过发送WM_COPYDATA 消息来传输字节的。

代码如下：

Server.cpp

#include <Windows.h>
#include <stdio.h>
#include <iostream>
#include <thread>

using namespace std;

DWORD dwWritten;
DWORD num;
DWORD dwRead;
char strMessage[256];
HWND h_client;
void td1();
COORD coord;
SHORT i = 0;
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
    HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
    HANDLE hStdIn = GetStdHandle(STD_INPUT_HANDLE);
    if (message == WM_DESTROY) {

        PostQuitMessage(0);
    }
    if (message == WM_COPYDATA)
    {        
        COPYDATASTRUCT* pcds = (COPYDATASTRUCT*)lParam;
        if (pcds->dwData == 1)
        {
            CHAR* lpszString = (CHAR*)(pcds->lpData);
            WriteConsoleOutputCharacterA(hStdOut, lpszString, strlen(lpszString)-2, { 0,i++ }, &dwWritten); 
        }
        if (i > 24)
        {
            system("cls");
            i = 0;
            coord.X = 0;
            coord.Y = 25;
            SetConsoleCursorPosition(hStdOut, coord);
            printf("----------------------------------------------------------------------------------------------------------
");
        }
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
};

HINSTANCE hinst;

int main() {
    HWND hwnd;

    hinst = GetModuleHandle(NULL);
    // create a window class:
    WNDCLASS wc = {};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hinst;
    wc.lpszClassName = L"win32";

    // register class with operating system:
    RegisterClass(&wc);

    // create and show window:
    hwnd = CreateWindow(L"win32", L"Server", 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, NULL, NULL);
    std::thread t1(td1);
    if (hwnd == NULL) {
        return 0;
    }

    ShowWindow(hwnd, SW_SHOW);


    MSG msg = {};

    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

}

void td1()
{
    HANDLE hStdIn = GetStdHandle(STD_INPUT_HANDLE);
    HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
    while (1)
    {
        h_client = FindWindow(L"win32", L"Client");
        if (h_client)
        {
            break;
        }
    }  
    coord.X = 0;
    coord.Y = 25;
    SetConsoleCursorPosition(hStdOut, coord);
    printf("----------------------------------------------------------------------------------------------------------");
    while (1)
    {
        coord.X = 0;
        coord.Y = 26;
        SetConsoleCursorPosition(hStdOut, coord);
        memset(strMessage, 0, 256);
        ReadFile(hStdIn, strMessage, 256, &dwRead, NULL); 
        SetConsoleCursorPosition(hStdOut, coord);
        for (int i = strlen(strMessage); i > 0; i--)
        {
            putchar(32);
        }  
        COPYDATASTRUCT cds;
        cds.dwData = 1; // can be anything
        cds.cbData = sizeof(CHAR) * strlen(strMessage);
        cds.lpData = strMessage;
        SendMessage(h_client, WM_COPYDATA, (WPARAM)h_client, (LPARAM)(LPVOID)&cds);        
    }
}

Client.cpp

#include <Windows.h>
#include <stdio.h>
#include <iostream>
#include <thread>

using namespace std;

DWORD dwWritten;
DWORD dwRead;
char strMessage[256];
HWND h_server;
SHORT i = 0;
COORD coord;
void td1();

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
    HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
    HANDLE hStdIn = GetStdHandle(STD_INPUT_HANDLE);
    if (message == WM_DESTROY) {

        PostQuitMessage(0);
    }
    if (message == WM_COPYDATA)
    {       
        COPYDATASTRUCT* pcds = (COPYDATASTRUCT*)lParam;
        if (pcds->dwData == 1)
        {
            CHAR* lpszString = (CHAR*)(pcds->lpData);
            int len = pcds->cbData;
            WriteConsoleOutputCharacterA(hStdOut, lpszString, len - 2, { 0,i++ }, &dwWritten);
        }
        if (i > 24)
        {
            system("cls");
            i = 0;        
            coord.X = 0;
            coord.Y = 25;
            SetConsoleCursorPosition(hStdOut, coord);
            printf("----------------------------------------------------------------------------------------------------------
");
        }
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}

HINSTANCE hinst;

int main() {
    HWND hwnd;

    hinst = GetModuleHandle(NULL);
    // create a window class:
    WNDCLASS wc = {};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hinst;
    wc.lpszClassName = L"win32";

    // register class with operating system:
    RegisterClass(&wc);

    // create and show window:
    hwnd = CreateWindow(L"win32", L"Client", 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, NULL, NULL);
    std::thread t1(td1);

    if (hwnd == NULL) {
        return 0;
    }

    ShowWindow(hwnd, SW_SHOW);


    MSG msg = {};

    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

}

void td1()
{
    HANDLE hStdIn = GetStdHandle(STD_INPUT_HANDLE);
    HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);  
    while (1)
    {
        h_server = FindWindow(L"win32", L"Server");
        if (h_server)
        {
            break;
        }
    }
    coord.X = 0;
    coord.Y = 25;
    SetConsoleCursorPosition(hStdOut, coord);
    printf("----------------------------------------------------------------------------------------------------------");
    while (1)
    {              
        coord.X = 0;
        coord.Y = 26;
        SetConsoleCursorPosition(hStdOut, coord);
        memset(strMessage, 0, 256);
        ReadFile(hStdIn, strMessage, 256, &dwRead, NULL);  
        SetConsoleCursorPosition(hStdOut, coord);
        for (int i = strlen(strMessage); i > 0; i--)
        {
            putchar(32);
        }
        COPYDATASTRUCT cds;
        cds.dwData = 1; // can be anything
        cds.cbData = sizeof(CHAR) * (strlen(strMessage) + 1);
        cds.lpData = strMessage;
        SendMessage(h_server, WM_COPYDATA, (WPARAM)h_server, (LPARAM)(LPVOID)&cds);
    }
}

实现效果：