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Polyline 函数
通过连接数组中标识的点，画出一串线段。Polyline函数不会使用及修改当前位置。
如果需要使用和修改当前位置，可使用 PolylineTo 函数。
函数原型：
BOOL Polyline (
HDC hdc,POINT * lppt,int cPoints );
参数
返回值
类型：BOOL
如果成功，返回非0。
如果失败，返回0。
如果失败，返回0。
备注
不同于 LineTo 或 PolylineTo 函数，Polyline函数不会使用及修改当前位置。
支持
| 最低桌面系统支持 | Windows 2000 Professional |
| 头文件 | Wingdi.h (已包含在Windows.h中) |
| 库 | Gdi32.lib |
| DLL | Gdi32.dll |
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