Windows開發的常識
1)窗口
2)句柄
Syntax
DWORD WINAPI SuspendThread(
__in HANDLE hThread
);
又比如,你想讀一個文件,其函數ReadFile的原型如下:(第一個參數就是一個文件的句柄。)BOOL WINAPI ReadFile( __in HANDLE hFile, __out LPVOID lpBuffer, __in DWORD nNumberOfBytesToRead, __out_opt LPDWORD lpNumberOfBytesRead, __inout_opt LPOVERLAPPED lpOverlapped );…………類似的例子還有很多,基本上想操作Windows對象都需要指向它們的句柄,句柄在語義上與C中的指針一樣,但是,語法上是完全不一樣的。
3)進程
4)線程
基本的正常的Windows程序
代碼
#include <windows.h>
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("BossJue");
HWND hwnd;
MSG msg;
WNDCLASSEX wndclassex = {0};
wndclassex.cbSize = sizeof(WNDCLASSEX);
wndclassex.style = CS_HREDRAW | CS_VREDRAW;
wndclassex.lpfnWndProc = WndProc;
wndclassex.cbClsExtra = 0;
wndclassex.cbWndExtra = 0;
wndclassex.hInstance = hInstance;
wndclassex.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wndclassex.hCursor = LoadCursor (NULL, IDC_ARROW);
wndclassex.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
wndclassex.lpszMenuName = NULL;
wndclassex.lpszClassName = szAppName;
wndclassex.hIconSm = wndclassex.hIcon;
if (!RegisterClassEx (&wndclassex))
{
MessageBox (NULL, TEXT ("RegisterClassEx failed!"), szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindowEx (WS_EX_OVERLAPPEDWINDOW,
szAppName,
TEXT ("WindowTitle"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);
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)
{
static const LPTSTR text = TEXT("Hello,World");
HDC hdc;
PAINTSTRUCT ps;
switch (message)
{
case WM_CREATE:
return (0);
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps);
TextOut (hdc, 0, 0, text, lstrlen(text));
EndPaint (hwnd, &ps);
return (0);
case WM_DESTROY:
PostQuitMessage (0);
return (0);
}
return DefWindowProc (hwnd, message, wParam, lParam);
}
運行
按下Ctrl + F5,你可能會碰到如下的鏈接錯誤:代碼解釋
編寫Windows程序的過程
szAppName,
TEXT ("WindowTitle"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL); 其實就是創建窗口,LRESULT CALLBACK WndProc (HWND hwnd, UINT message,WPARAM wParam, LPARAM lParam)其實就是那個消息處理函數,只不過,這個消息處理函數不需要我們自己調用,當有消息的時候,Windows會自己調用這個函數來處理,我們只需要編寫處理代碼,但是,編寫的代碼不需要我們自己手動調用(這也許就是Callback函數的原因)。