#include <windows.h>
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LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
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int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR szCmdLine, int iCmdShow)
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...{
static TCHAR szAppName[] = TEXT("Bezier");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
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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;
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if(!RegisterClass(&wndclass))
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...{
MessageBox(NULL, TEXT("Program requires Windows NT!"), szAppName, MB_ICONERROR);
return 0;
}
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hwnd = CreateWindow(szAppName, TEXT("Bezier Splines"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL);
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
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while(GetMessage(&msg, NULL, 0, 0))
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...{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
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LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
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...{
static HDC hdc;
static HPEN hPen1, hPen2;
int cxClient, cyClient;
static int nCount = 0;
static int crColor = RGB(255, 0, 0);
static POINT apt[256];
PAINTSTRUCT ps;
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switch(message)
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...{
case WM_SIZE:
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cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);
hdc = GetDC(hwnd);
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crColor = RGB(0, 0, 255);
hPen1 = CreatePen(PS_SOLID, 5, crColor);
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crColor = RGB(255, 0, 0);
hPen2 = CreatePen(PS_SOLID, 1, crColor);
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return 0;
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case WM_LBUTTONDOWN:
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apt[nCount].x = LOWORD(lParam);
apt[nCount].y = HIWORD(lParam);
nCount++;
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SelectObject(hdc, (HGDIOBJ) hPen1);
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MoveToEx(hdc, LOWORD(lParam), HIWORD(lParam), NULL);
LineTo(hdc, LOWORD(lParam), HIWORD(lParam));
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return 0;
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case WM_RBUTTONDOWN:
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SelectObject(hdc, (HGDIOBJ) hPen2);
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apt[nCount].x = apt[0].x;
apt[nCount].y = apt[0].y;
Polyline(hdc, apt, nCount + 1);
nCount = 0;
return 0;
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/**//*case WM_PAINT:
InvalidateRect(hwnd, NULL, TRUE);
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hdc = BeginPaint(hwnd, &ps);
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SetPixel(hdc, mx, my, crColor);
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EndPaint(hwnd, &ps);
return 0;*/
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case WM_DESTROY:
ReleaseDC(hwnd, hdc);
DeleteObject(hPen1);
DeleteObject(hPen2);
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}一个比较简单的,画线的程序。
先用鼠标左键点画点,然后点一下鼠标右键。就会按顺序将这些点用连起来。
修改自《Windows程序设计》上的一个例子,刚刚学习Win32 SDK编程时做的
代码看起来挺笨拙的。