📄 计算机世界网-使用gdi+编程.htm
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<TD class=a14>SelectObject(hdc, hPen); 选入设备描述表</TD></TR></TBODY></TABLE>
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<TD class=a14>MoveToEx(hdc, 20, 10, NULL); 画线</TD></TR></TBODY></TABLE>
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<TD class=a14>LineTo(hdc, 200, 100);</TD></TR></TBODY></TABLE>
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<TD class=a14>EndPaint(hWnd, &ps); 结束绘制</TD></TR></TBODY></TABLE>
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<TD class=a14 height=19><B>GDI+</B></TD></TR></TBODY></TABLE>
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<TD class=a14>HDC hdc;</TD></TR></TBODY></TABLE>
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<TD class=a14>PAINTSTRUCT ps;</TD></TR></TBODY></TABLE>
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<TD class=a14>Pen* myPen;</TD></TR></TBODY></TABLE>
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<TD class=a14>Graphics* myGraphics;</TD></TR></TBODY></TABLE>
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<TD class=a14>…</TD></TR></TBODY></TABLE>
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<TD class=a14>hdc = BeginPaint(hWnd, &ps);</TD></TR></TBODY></TABLE>
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<TD class=a14>myPen = new Pen(0xffff0000, 3);
创建一个笔，宽3，红色</TD></TR></TBODY></TABLE>
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<TD class=a14>myGraphics = new Graphics(hdc);
利用设备句柄创建图形对象</TD></TR></TBODY></TABLE>
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<TD class=a14>myGraphics->DrawLine(myPen, 20, 10, 200,
100);调用图形对象画线的方法</TD></TR></TBODY></TABLE>
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<TD class=a14>EndPaint(hWnd, &ps);</TD></TR></TBODY></TABLE>
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<TD class=a14><FONT size=4><B>四
如何使用GDI+</B></FONT></TD></TR></TBODY></TABLE>
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<TD class=a14>GDI+并不是Windows
XP的专利，它同样可以在其它Windows操作系统下使用（不包括Win3.X），包括64位的Windows版本,按照微软官方的话说，GDI+支持所有基于Windows的应用程序。你只要把GDIPlus.dll拷入Windows的系统目录，即可使用需要GDI+支持的应用程序。Microsoft
Visual C＃全面支持GDI+，Microsoft Visual C++.net</TD></TR></TBODY></TABLE>
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<TD class=a14>使用GDI+有两种方法,一种方法是通过托管（managed
）的应用程序实现，另一种方法是在非托管项目中借助于调用C++面向对象类实现。</TD></TR></TBODY></TABLE>
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<TD class=a14>下面是一个基于Win32
SDK的窗口程序。使用要包含GDIplus.h头文件，连接设置要包含GdiPlus.lib库文件。</TD></TR></TBODY></TABLE>
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<TD class=a14>#define UNICODE</TD></TR></TBODY></TABLE>
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<TD class=a14>#include <WINDOWS.H></TD></TR></TBODY></TABLE>
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<TD class=a14>#include <GDIPLUS.H></TD></TR></TBODY></TABLE>
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<TD class=a14>using namespace Gdiplus;</TD></TR></TBODY></TABLE>
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<TD class=a14></TD></TR></TBODY></TABLE>
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<TD class=a14>void OnPaint(HWND hWnd)</TD></TR></TBODY></TABLE>
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<TD class=a14>{</TD></TR></TBODY></TABLE>
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<TD class=a14>HDC hdc;</TD></TR></TBODY></TABLE>
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<TD class=a14>PAINTSTRUCT ps;</TD></TR></TBODY></TABLE>
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<TD class=a14></TD></TR></TBODY></TABLE>
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<TD class=a14>hdc = BeginPaint(hWnd, &ps);</TD></TR></TBODY></TABLE>
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<TD class=a14></TD></TR></TBODY></TABLE>
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<TD class=a14>Graphics graphics(hdc);</TD></TR></TBODY></TABLE>
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<TD class=a14>Pen pen(Color(255, 0, 0, 255));</TD></TR></TBODY></TABLE>
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<TD class=a14></TD></TR></TBODY></TABLE>
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<TD class=a14>graphics.DrawLine(&pen, 0, 0, 200,
100);</TD></TR></TBODY></TABLE>
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<TD class=a14></TD></TR></TBODY></TABLE>
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<TD class=a14>EndPaint(hWnd, &ps);</TD></TR></TBODY></TABLE>
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<TD class=a14></TD></TR></TBODY></TABLE>
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<TD class=a14>} // OnPaint</TD></TR></TBODY></TABLE>
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<TD class=a14></TD></TR></TBODY></TABLE>
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<TD class=a14>LRESULT CALLBACK WndProc(HWND, UINT, WPARAM,
LPARAM);</TD></TR></TBODY></TABLE>
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<TD class=a14></TD></TR></TBODY></TABLE>
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<TD class=a14>int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE,</TD></TR></TBODY></TABLE>
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<TD class=a14>PSTR szCmdLine, int iCmdShow)</TD></TR></TBODY></TABLE>
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<TD class=a14>{</TD></TR></TBODY></TABLE>
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<TD class=a14>HWND hWnd;</TD></TR></TBODY></TABLE>
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<TD class=a14>MSG msg;</TD></TR></TBODY></TABLE>
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<TD class=a14>WNDCLASS wndClass;</TD></TR></TBODY></TABLE>
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<TD class=a14>GdiplusStartupInput
gdiplusStartupInput;</TD></TR></TBODY></TABLE>
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<TD class=a14>ULONG_PTR gdiplusToken;</TD></TR></TBODY></TABLE>
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<TD class=a14></TD></TR></TBODY></TABLE>
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<TD class=a14>// GDI+ 初始化</TD></TR></TBODY></TABLE>
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<TD class=a14>GdiplusStartup(&gdiplusToken,
&gdiplusStartupInput, NULL);</TD></TR></TBODY></TABLE>
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<TD class=a14></TD></TR></TBODY></TABLE>
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<TD class=a14>wndClass.style = CS_HREDRAW |
CS_VREDRAW;</TD></TR></TBODY></TABLE>
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<TD class=a14>wndClass.lpfnWndProc = WndProc;</TD></TR></TBODY></TABLE>
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<TD class=a14>wndClass.cbClsExtra = 0;</TD></TR></TBODY></TABLE>
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<TD class=a14>wndClass.cbWndExtra = 0;</TD></TR></TBODY></TABLE>
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<TD class=a14>wndClass.hInstance = hInstance;</TD></TR></TBODY></TABLE>
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<TD class=a14>wndClass.hIcon = LoadIcon(NULL,
IDI_APPLICATION);</TD></TR></TBODY></TABLE>
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<TD class=a14>wndClass.hCursor = LoadCursor(NULL,
IDC_ARROW);</TD></TR></TBODY></TABLE>
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<TD class=a14>wndClass.hbrBackground =
(HBRUSH)GetStockObject(WHITE_BRUSH);</TD></TR></TBODY></TABLE>
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<TD class=a14>wndClass.lpszMenuName = NULL;</TD></TR></TBODY></TABLE>
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<TD class=a14>wndClass.lpszClassName =
TEXT("GettingStarted");</TD></TR></TBODY></TABLE>
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<TD class=a14></TD></TR></TBODY></TABLE>
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<TD class=a14>RegisterClass(&wndClass);</TD></TR></TBODY></TABLE>
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<TD class=a14></TD></TR></TBODY></TABLE>
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<TD class=a14>hWnd = CreateWindow(</TD></TR></TBODY></TABLE>
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<TD class=a14>TEXT("GettingStarted"), // window class
name</TD></TR></TBODY></TABLE>
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<TD class=a14>TEXT("Getting Started"), // window
caption</TD></TR></TBODY></TABLE>
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<TD class=a14>WS_OVERLAPPEDWINDOW, // window
style</TD></TR></TBODY></TABLE>
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<TD class=a14>CW_USEDEFAULT, // initial x
position</TD></TR></TBODY></TABLE>
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<TD class=a14>CW_USEDEFAULT, // initial y
position</TD></TR></TBODY></TABLE>
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<TD class=a14>CW_USEDEFAULT, // initial x size</TD></TR></TBODY></TABLE>
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<TD class=a14>CW_USEDEFAULT, // initial y size</TD></TR></TBODY></TABLE>
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