用SDK创建一个简单带滚动条的窗口
//=====================================================================================================
//TITLE:
// 用SDK创建一个简单带滚动条的窗口
//AUTHOR:
// norains
//DATE:
// Friday 25-July-2006
//=====================================================================================================
代码比较简单,思路是先创建一个主窗口framewindow,然后创建一个子窗口clientwindow,子窗口带有滚动条,可以随意滚动.
在创建的时候,必须要遵循如下步骤:
1.注册主窗口;注册子窗口
2.用CreateWindow()函数创建主窗口
3.在主窗口的WM_CREAT消息时创建子窗口,否则子窗口将无法显示
还有一点要注意的是,采用CreateWindow创建子窗口时hMenu参数不能为空,并且创建完毕后需要设置子窗口位置,否则滚动条在如下代码中不会显示.
/************************************************************************/
FullWnd.h
/************************************************************************/
// Generic defines used by application
#define IDC_CLIENT 2 // Client window ID
#define FRAME_TITLE TEXT("ImageFrame") //Full displayed frame window title
#define FRAME_CLASS_NAME TEXT("ImageFrame") //Full displayed frame class name
#define CLIENT_TITLE TEXT("") //Full displayed client window title
#define CLIENT_CLASS_NAME TEXT("ImageClient") //Full displayed client window class name
//----------------------------------------------------------------------
//Client Window
int RegisterClient (HINSTANCE);
HWND InitClientInstance (HWND hWnd,HINSTANCE hInstance);
LRESULT CALLBACK ClientWndProc (HWND, UINT, WPARAM, LPARAM);
//----------------------------------------------------------------------
// Frame Window
//
BOOL RegisterFrame (HINSTANCE);
HWND InitFrameInstance (HINSTANCE, LPWSTR, int);
int TermFrameInstance (HINSTANCE, int);
// Window procedures
LRESULT CALLBACK FrameWndProc (HWND, UINT, WPARAM, LPARAM);
// Message handlers
LRESULT DoCreateFrame (HWND, UINT, WPARAM, LPARAM);
LRESULT DoSizeFrame (HWND, UINT, WPARAM, LPARAM);
LRESULT DoDestroyFrame (HWND, UINT, WPARAM, LPARAM);
/************************************************************************/
FullWndFrame.cpp
/************************************************************************/
#include "stdafx.h"
#include <windows.h> // For all that Windows stuff
#include "FullWnd.h" // Program-specific stuff
//----------------------------------------------------------------------
// Global data
//
HINSTANCE hInst; // Program instance handle
//=====================================================================
//======================================================================
// Program entry point
//
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPWSTR lpCmdLine, int nCmdShow) {
MSG msg;
int rc = 0;
HWND hwndFrame;
// Initialize application.
rc = RegisterFrame (hInstance);
if (rc) return rc;
// Initialize this instance.
hwndFrame = InitFrameInstance (hInstance, lpCmdLine, nCmdShow);
if (hwndFrame == 0)
return 0x10;
// Application message loop
while (GetMessage (&msg, NULL, 0, 0)) {
TranslateMessage (&msg);
DispatchMessage (&msg);
}
// Instance cleanup
return TermInstance (hInstance, msg.wParam);
}
//=====================================================================
// Register Frame window
BOOL RegisterFrame (HINSTANCE hInstance) {
WNDCLASS wc;
// Register application frame window class.
wc.style = 0; // Window style
wc.lpfnWndProc = FrameWndProc; // Callback function
wc.cbClsExtra = 0; // Extra class data
wc.cbWndExtra = 0; // Extra window data
wc.hInstance = hInstance; // Owner handle
wc.hIcon = NULL, // Application icon
wc.hCursor = NULL; // Default cursor
wc.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
wc.lpszMenuName = NULL; // Menu name
wc.lpszClassName = FRAME_CLASS_NAME; // Window class name
if (RegisterClass (&wc) == 0)
{
return FALSE;
}
// Initialize client window class.
if (RegisterClient (hInstance) != 0)
{
return FALSE;
}
return TRUE;
}
//=====================================================================
// Instance initialization for frame
//
HWND InitFrameInstance (HINSTANCE hInstance, LPWSTR lpCmdLine, int nCmdShow) {
HWND hWnd;
// Save program instance handle in global variable.
hInst = hInstance;
// Create frame window.
hWnd = CreateWindow (FRAME_CLASS_NAME, // Window class
FRAME_TITLE, // Window title
WS_VISIBLE, // Style flags
CW_USEDEFAULT, // x position
CW_USEDEFAULT, // y position
CW_USEDEFAULT, // Initial width
CW_USEDEFAULT, // Initial height
NULL, // Parent
NULL, // Menu, must be null
hInstance, // Application instance
NULL); // Pointer to create
// parameters
// Return fail code if window not created.
if (!IsWindow (hWnd)) return 0;
// Standard show and update calls
ShowWindow (hWnd, nCmdShow);
UpdateWindow (hWnd);
return hWnd;
}
//=====================================================================
// TermInstance - Program cleanup
//
int TermFrameInstance (HINSTANCE hInstance, int nDefRC) {
return nDefRC;
}
//======================================================================
// Callback function for application window
//
LRESULT CALLBACK FrameWndProc (HWND hWnd, UINT wMsg, WPARAM wParam,
LPARAM lParam) {
switch(wMsg)
{
case WM_CREATE:
return DoCreateFrame(hWnd, wMsg, wParam, lParam);
case WM_SIZE:
return DoSizeFrame(hWnd, wMsg, wParam, lParam);
case WM_DESTROY:
return DoDestroyFrame(hWnd, wMsg, wParam, lParam);
}
return DefWindowProc (hWnd, wMsg, wParam, lParam);
}
//=====================================================================
// Process WM_CREATE message for window.
//
LRESULT DoCreateFrame (HWND hWnd, UINT wMsg, WPARAM wParam,
LPARAM lParam) {
HWND hWndClient;
hWndClient=InitClientInstance(hWnd,hInst);
if(hWndClient==NULL)
{
DestroyWindow(hWnd);
}
return 0;
}
//=====================================================================
// Process WM_SIZE message for window.
//
LRESULT DoSizeFrame (HWND hWnd, UINT wMsg, WPARAM wParam, LPARAM lParam) {
RECT rect;
GetClientRect (hWnd, &rect);
SetWindowPos (GetDlgItem (hWnd, IDC_CLIENT), NULL, rect.left, rect.top,
rect.right - rect.left, rect.bottom - rect.top,
SWP_NOZORDER);
return 0;
}
//=====================================================================
// Process WM_DESTROY message for window.
//
LRESULT DoDestroyFrame (HWND hWnd, UINT wMsg, WPARAM wParam,
LPARAM lParam) {
PostQuitMessage (0);
return 0;
}
/************************************************************************/
FullWndClient.cpp
/************************************************************************/
#include "stdafx.h"
#include <windows.h> // For all that Windows stuff
#include "FullWnd.h" // Program-specific stuff
//----------------------------------------------------------------------
// Resister client window
//
int RegisterClient (HINSTANCE hInstance) {
WNDCLASS wc;
// Register application client window class.
wc.style = 0; // Window style
wc.lpfnWndProc = ClientWndProc; // Callback function
wc.cbClsExtra = 0; // Extra class data
wc.cbWndExtra = 0; // Extra window data
wc.hInstance = hInstance; // Owner handle
wc.hIcon = NULL, // Application icon
wc.hCursor = NULL; // Default cursor
wc.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
wc.lpszMenuName = NULL; // Menu name
wc.lpszClassName = CLIENT_CLASS_NAME; // Window class name
if (RegisterClass (&wc) == 0) return 1;
return 0;
}
//======================================================================
// Callback function for application window
LRESULT CALLBACK ClientWndProc (HWND hWnd, UINT wMsg, WPARAM wParam,
LPARAM lParam) {
return DefWindowProc (hWnd, wMsg, wParam, lParam);
}
//=======================================================================
//Instance initialization for client
HWND InitClientInstance (HWND hWnd,HINSTANCE hInstance)
{
HWND hWndClient;
hWndClient=CreateWindow (CLIENT_CLASS_NAME,
CLIENT_TITLE,
WS_VISIBLE | WS_CHILD | WS_VSCROLL | WS_HSCROLL,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
hWnd,
(HMENU)IDC_CLIENT,
hInstance,
NULL);
// Destroy frame if client window not created.
if (!IsWindow (hWndClient))
{
return 0;
}
return hWndClient;
}
