23、Windows API 进程间通信，数据复制消息(WM_COPYDATA)

通过WM_COPYDATA进程间通信
**************************************/
/* 头文件 */
#include < windows.h >
#include < commctrl.h >
#include " resource.h "
/* 全局变量 */
HINSTANCE hinst;
HWND hwnd, hwndEdit;
LPSTR lpszCopy = " you can input any text\n then click \'Send\' Item at Menu " ;
/* 函数声明 */
int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int );
LRESULT CALLBACK MainWndProc(HWND, UINT, WPARAM, LPARAM);

/* ************************************
* WinMain
************************************* */
int WINAPI WinMain(
HINSTANCE hinstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
MSG msg;
WNDCLASSEX wcx;

hinst = hinstance; // 保存应用程序实例

// 填充WNDCLASSEX
wcx.cbSize = sizeof (wcx);
wcx.style = CS_HREDRAW | CS_VREDRAW;
wcx.lpfnWndProc = MainWndProc; // 消息处理函数
wcx.cbClsExtra = 0 ;
wcx.cbWndExtra = 0 ;
wcx.hInstance = hinstance;
wcx.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wcx.hCursor = LoadCursor(NULL, IDC_ARROW);
wcx.hbrBackground = (HBRUSH)GetStockObject( WHITE_BRUSH);
wcx.lpszMenuName = MAKEINTRESOURCE(IDR_MENU_COMMAND); // 菜单
wcx.lpszClassName = " copydata " ; // 窗口类名
wcx.hIconSm = NULL;
// 注册窗口类
if (RegisterClassEx( & wcx) == 0 )
{
return 0 ;
}
// 创建窗口
hwnd = CreateWindow(
" copydata " ,
" Sample " ,
WS_TILEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 500 , 400 ,
(HWND) NULL,
(HMENU) NULL,
hinstance,
(LPVOID) NULL);
if ( ! hwnd)
return 0 ;

// 显示、刷新窗口
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
// 消息循环

BOOL fGotMessage;
while ((fGotMessage = GetMessage( & msg, (HWND) NULL, 0 , 0 )) != 0 && fGotMessage != - 1 )
{
TranslateMessage( & msg);
DispatchMessage( & msg);
}
return msg.wParam;
UNREFERENCED_PARAMETER(lpCmdLine);
}

/* ************************************
* 消息处理函数
************************************* */
LONG APIENTRY MainWndProc(HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
{
// 在主窗口创建时，创建一个EDIT控件，用于编辑需要复制的内容
RECT rectMain;
GetClientRect(hwnd, & rectMain);
hwndEdit = CreateWindow( " EDIT " ,
NULL,
WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_BORDER |
ES_LEFT | ES_MULTILINE | ES_AUTOVSCROLL,
0 ., 0 , rectMain.right, rectMain.bottom,
hwnd, NULL,
(HINSTANCE) GetWindowLong(hwnd, GWL_HINSTANCE),
NULL);
if (hwndEdit == NULL)
{
MessageBox(hwnd, " Create Window Error " , " ERROR " ,MB_OK);
ExitProcess( 0 );
}
// 设置EDIT控件的内容
SendMessage(hwndEdit, WM_SETTEXT, 0 , (LPARAM) lpszCopy);
break ;
}
case WM_COMMAND: // 菜单输入
{
// 如果通过菜单点击“send”按钮
if (LOWORD(wParam) == ID_COMMAND_SEND)
{
// 获取EDIT控件中的文本
DWORD dwTextLenth = GetWindowTextLength(hwndEdit);
LPSTR szText = (LPSTR)HeapAlloc(GetProcessHeap(),HEAP_NO_SERIALIZE,dwTextLenth);
GetWindowText(hwndEdit,szText,dwTextLenth);
// 构造 COPYDATASTRUCT
COPYDATASTRUCT cds;
HWND hwnd2 = FindWindow( " copydata2 " , " RECV COPY DATA " );
if (hwnd2 == NULL)
{
MessageBox(hwnd, " can not find window 2 " , " ERROR " ,MB_OK);
break ;
}
cds.dwData = 0x12345678 ; // 自定义的数据
cds.cbData = dwTextLenth; // lpData的长度
cds.lpData = szText; // 需要复制的数据
// 发送消息，COPYDATASTRUCT结构的指针做为lParam
SendMessage(
hwnd2, // 目的窗口
(UINT) WM_COPYDATA, // 消息 ID
(WPARAM) hwnd, // wParam，源窗口句柄
(LPARAM) & cds // lParam，COPYDATASTRUCT
);
// 释放内存
HeapFree(GetProcessHeap(),HEAP_NO_SERIALIZE,szText);
}
break ;
}
case WM_DESTROY: // 退出
PostQuitMessage( 0 );
return 0 ;

default : // 其他消息的处理
return DefWindowProc(hwnd, message, wParam, lParam);
}
return 0 ;
}

通过WM_COPYDATA进程间通信
**************************************/
/* 头文件 */
#include < windows.h >
#include < commctrl.h >
/* 全局变量 */
HINSTANCE hinst;
HWND hwnd,hwndEdit;
/* 函数声明 */
int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int );
LRESULT CALLBACK MainWndProc(HWND, UINT, WPARAM, LPARAM);

/* ************************************
* void main()
* 功能 进程间mailslot通信客户端
************************************* */
int WINAPI WinMain(
HINSTANCE hinstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
MSG msg;
WNDCLASSEX wcx;
// 填充WNDCLASSEX
wcx.cbSize = sizeof (wcx);
wcx.style = CS_HREDRAW | CS_VREDRAW;
wcx.lpfnWndProc = MainWndProc;
wcx.cbClsExtra = 0 ;
wcx.cbWndExtra = 0 ;
wcx.hInstance = hinstance;
wcx.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wcx.hCursor = LoadCursor(NULL, IDC_ARROW);
wcx.hbrBackground = (HBRUSH)GetStockObject( WHITE_BRUSH);
wcx.lpszMenuName = NULL;
wcx.lpszClassName = " copydata2 " ;
wcx.hIconSm = NULL;
// 注册窗口类
if (RegisterClassEx( & wcx) == 0 )
{
return 0 ;
}
// 创建窗口
hwnd = CreateWindow(
" copydata2 " ,
" RECV COPY DATA " ,
WS_TILEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 500 , 400 ,
(HWND) NULL, (HMENU) NULL, hinstance, (LPVOID) NULL
);

if ( ! hwnd)
return 0 ;
// 显示刷新窗口
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
// 消息
BOOL fGotMessage;
while ((fGotMessage = GetMessage( & msg, (HWND) NULL, 0 , 0 )) != 0 && fGotMessage != - 1 )
{
TranslateMessage( & msg);
DispatchMessage( & msg);
}
return msg.wParam;
UNREFERENCED_PARAMETER(lpCmdLine);
return 0 ;
}

// 消息处理函数
LONG APIENTRY MainWndProc(HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
{
// 创建主窗口时，创建一个EDIT控件
RECT rectMain;
GetClientRect(hwnd, & rectMain);
hwndEdit = CreateWindow( " EDIT " ,
NULL,
WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_BORDER |
ES_LEFT | ES_MULTILINE | ES_AUTOVSCROLL,
0 ., 0 , rectMain.right, rectMain.bottom,
hwnd,
NULL,
(HINSTANCE) GetWindowLong(hwnd, GWL_HINSTANCE),
NULL);
if (hwndEdit == NULL)
{
MessageBox(hwnd, " Create Window Error " , " ERROR " ,MB_OK);
ExitProcess( 0 );
}
break ;
case WM_COPYDATA:
{
// 当收到WM_COPYDATA消息时，从lParam中提取出
// COPYDATASTRUCT
PCOPYDATASTRUCT lpcds = (PCOPYDATASTRUCT)lParam;
// 将复制的数据在界面上显示
SetWindowText(hwndEdit,(LPSTR)lpcds -> lpData);
break ;
}

case WM_DESTROY: // 退出
PostQuitMessage( 0 );
return 0 ;

default : // 其他消息处理
break ;
}
}
return DefWindowProc(hwnd, message, wParam, lParam);
}