程序结构概述
#include <windows.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT("HelloWin");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground= (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName= szAppName;
if(!RegisterClass(&wndclass))
{
MessageBox(NULL, TEXT("This program requires Windows NT!"), szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow(szAppName, // window class name
TEXT("The Hello Win Program"), // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT,// initial x position
CW_USEDEFAULT,// initial y position
CW_USEDEFAULT,// initial x size
CW_USEDEFAULT,// initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL); // creation parameters
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
switch (message)
{
case WM_CREATE:
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
GetClientRect(hwnd, &rect);
DrawText(hdc, TEXT("Hello, Windows!"), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
EndPaint(hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
程序结构可拆分为以下几个步骤(部分)：
窗口类别：创建窗口类别(定义WNDCLASS对象)&注册窗口类别(RegisterClass)窗口：创建窗口(CreateWindow)&显示窗口(ShowWindow)&更新窗口(UpdateWindow)消息循环：获取消息(GetMessage)&转换消息(TranslateMessage)&分发消息(DispatchMessage)窗口消息处理程序：处理各类窗口消息，WM_CREATE，WM_PAINT，WM_DESTROY等
windows程序的基本流程为：
注册窗口类别建立窗口显示窗口消息循环消息处理(窗口消息处理程序)
