プログラマ専用SNS ミクプラ

コード:

void SendData()
{
COPYDATASTRUCT cd;
HWND hWnd;
char buffer[500];
 strcpy(buffer, "Hello World!");

cd.dwData = 0;
cd.cbData = strlen(buffer)+1;
cd.lpData = buffer;

hWnd = FindWindow("ReceiveApp", NULL);

SendMessage(hWnd, WM_COPYDATA, (WPARAM)NULL, (LPARAM)&cd);
}

コード:

#include <windows.h>

int main()
{
    HWND hWnd = FindWindow("ReceiveApp", NULL);
    char msg[] = "hello, world";
    COPYDATASTRUCT cd;
    cd.dwData = 0;
    cd.cbData = sizeof msg;
    cd.lpData = msg;
    SendMessage(hWnd, WM_COPYDATA, (WPARAM)NULL, (LPARAM)&cd);
    return 0;
}

コード:

#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int main()
{
    char *className = "ReceiveApp";
    HINSTANCE hInstance = GetModuleHandle(0);
    WNDCLASSEX wcex;
    HWND hWnd;

    MSG msg;
    wcex.cbSize         = sizeof(WNDCLASSEX);
    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = NULL;
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wcex.lpszMenuName   = NULL;
    wcex.lpszClassName  = className;
    wcex.hIconSm        = NULL;

    if (!RegisterClassEx(&wcex)) return FALSE;
    hWnd = CreateWindow(className, "Recv Window",
        WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT,
        320, 240, NULL, NULL, hInstance, NULL);
    ShowWindow(hWnd, SW_SHOW);
    UpdateWindow(hWnd);

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

LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg) {
    case WM_COPYDATA:
        {
            COPYDATASTRUCT *pCD = (COPYDATASTRUCT*)lParam;
            MessageBox(hWnd, (LPCSTR)pCD->lpData, "", MB_OK);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return(DefWindowProc(hWnd, msg, wParam, lParam));
    }
    return 0;
}