C#动态获取鼠标位置的颜色代码,CSharp代码库,德仔网

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【CSharp】 C#动态获取鼠标位置的颜色
作者:Dezai.CN / 发布于2011/9/28/ 1135
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<strong>API声明：</strong>
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<pre class="code"><span style="color: gray">/// <summary>
/// </span><span style="color: green">获取指定窗口的设备场景
</span><span style="color: gray">/// </summary>
/// <param name="hwnd"></span><span style="color: green">将获取其设备场景的窗口的句柄。若为0，则要获取整个屏幕的DC</span><span style="color: gray"></param>
/// <returns></span><span style="color: green">指定窗口的设备场景句柄，出错则为0</span><span style="color: gray"></returns>
</span><span>[</span><span style="color: #2b91af">DllImport</span><span>(</span><span style="color: #a31515">"user32.dll"</span><span>)]
</span><span style="color: blue">public static extern </span><span style="color: #2b91af">IntPtr </span><span>GetDC(</span><span style="color: #2b91af">IntPtr </span><span>hwnd);

</span><span style="color: gray">/// <summary>
/// </span><span style="color: green">释放由调用GetDC函数获取的指定设备场景
</span><span style="color: gray">/// </summary>
/// <param name="hwnd"></span><span style="color: green">要释放的设备场景相关的窗口句柄</span><span style="color: gray"></param>
/// <param name="hdc"></span><span style="color: green">要释放的设备场景句柄</span><span style="color: gray"></param>
/// <returns></span><span style="color: green">执行成功为1，否则为0</span><span style="color: gray"></returns>
</span><span>[</span><span style="color: #2b91af">DllImport</span><span>(</span><span style="color: #a31515">"user32.dll"</span><span>)]
</span><span style="color: blue">public static extern </span><span style="color: #2b91af">Int32 </span><span>ReleaseDC(</span><span style="color: #2b91af">IntPtr </span><span>hwnd, </span><span style="color: #2b91af">IntPtr </span><span>hdc);

</span><span style="color: gray">/// <summary>
/// </span><span style="color: green">在指定的设备场景中取得一个像素的RGB值
</span><span style="color: gray">/// </summary>
/// <param name="hdc"></span><span style="color: green">一个设备场景的句柄</span><span style="color: gray"></param>
/// <param name="nXPos"></span><span style="color: green">逻辑坐标中要检查的横坐标</span><span style="color: gray"></param>
/// <param name="nYPos"></span><span style="color: green">逻辑坐标中要检查的纵坐标</span><span style="color: gray"></param>
/// <returns></span><span style="color: green">指定点的颜色</span><span style="color: gray"></returns>
</span><span>[</span><span style="color: #2b91af">DllImport</span><span>(</span><span style="color: #a31515">"gdi32.dll"</span><span>)]
</span><span style="color: blue">public static extern uint </span><span>GetPixel(</span><span style="color: #2b91af">IntPtr </span><span>hdc, </span><span style="color: blue">int </span><span>nXPos, </span><span style="color: blue">int </span><span>nYPos);</span></pre>
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<span style="color: blue"><strong>使用：</strong>
public </span><span style="color: #2b91af">Color </span><span>GetColor(</span><span style="color: blue">int </span><span>x, </span><span style="color: blue">int </span><span>y)
{
</span><span style="color: #2b91af">IntPtr </span><span>hdc </span><span style="color: #0f7906">= </span><span>GetDC(</span><span style="color: #2b91af">IntPtr</span><span style="color: #0f7906">.</span><span>Zero); </span><span style="color: blue">uint </span><span>pixel </span><span style="color: #0f7906">= </span><span>GetPixel(hdc, x, y);
ReleaseDC(</span><span style="color: #2b91af">IntPtr</span><span style="color: #0f7906">.</span><span>Zero, hdc);
</span><span style="color: #2b91af">Color </span><span>color </span><span style="color: #0f7906">= </span><span style="color: #2b91af">Color</span><span style="color: #0f7906">.</span><span>FromArgb((</span><span style="color: blue">int</span><span>)(pixel </span><span style="color: #0f7906">& </span><span>0x000000FF), (</span><span style="color: blue">int</span><span>)(pixel </span><span style="color: #0f7906">& </span><span>0x0000FF00) </span><span style="color: #0f7906">>> </span><span>8, (</span><span style="color: blue">int</span><span>)(pixel </span><span style="color: #0f7906">& </span><span>0x00FF0000) </span><span style="color: #0f7906">>> </span><span>16);
</span><span style="color: blue">return </span><span>color;
}</span></div>
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