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分享求教DllImport和DllImportAttribute用法上的区别
DllImport和DllImportAttribute都能引入dll文件，他们在用法上有什么区别吗？
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mote 2003-03-26
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以下是我在书上看见的一段代码，如果两者相同，为何作者要在同一段代码中应用两种不同的编程风格？都用DllImport不是简单多呢？
[DllImport("gdi32.dll")]
private static extern bool BitBlt(
IntPtr hdcDest, // hanlde to destination Dc (device context)
int nXDest, // x-coord of destination upper-left corner
int nYDest, // y-coord of destination upper-left corner
int nWidth, // width of destination rectangle
int nHeight, // height of destination rectangle
HDC hdcSrc, // handle to source DC
int nXSrc, // x-coordinate of source upper-left corner
int nYSrc, // y-coordinate of source upper-left corner
System.Int32 dwRop // raster operation code
);
[DllImport("gdi32.dll")]
private static extern IntPtr CreateDC(
String DriverName, // driver name
String DeviceName, // device name
String Output, // not used; should be NULL
IntPtr lpInitData // optional printer data
);
[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
private static extern bool DeleteDC(
IntPtr dc
);
[System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
private static extern unsafe bool ClientToScreen(
IntPtr hWnd, // handle to window
Point* lpPoint // screen coordinates
);
[DllImport("gdi32.dll")]
private static extern bool BitBlt(
IntPtr hdcDest, // hanlde to destination Dc (device context)
int nXDest, // x-coord of destination upper-left corner
int nYDest, // y-coord of destination upper-left corner
int nWidth, // width of destination rectangle
int nHeight, // height of destination rectangle
HDC hdcSrc, // handle to source DC
int nXSrc, // x-coordinate of source upper-left corner
int nYSrc, // y-coordinate of source upper-left corner
System.Int32 dwRop // raster operation code
);
[DllImport("gdi32.dll")]
private static extern IntPtr CreateDC(
String DriverName, // driver name
String DeviceName, // device name
String Output, // not used; should be NULL
IntPtr lpInitData // optional printer data
);
[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
private static extern bool DeleteDC(
IntPtr dc
);
[System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
private static extern unsafe bool ClientToScreen(
IntPtr hWnd, // handle to window
Point* lpPoint // screen coordinates
);
Knight94 2003-03-25
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我觉得DllImport是关键字，而引入DLL需要写明其它属性，例如如下所示，DllImport后面括号中间都是DllImportAttribute
[DllImport("KERNEL32.DLL", EntryPoint="MoveFileW", SetLastError=true,
CharSet=CharSet.Unicode, ExactSpelling=true,
CallingConvention=CallingConvention.StdCall)]
public static extern bool MoveFile(String src, String dst);
[DllImport("KERNEL32.DLL", EntryPoint="MoveFileW", SetLastError=true,
CharSet=CharSet.Unicode, ExactSpelling=true,
CallingConvention=CallingConvention.StdCall)]
public static extern bool MoveFile(String src, String dst);
robosmart 2003-03-25
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DllImport = DllImportAttribute，Attribute在使用时可以省略不写
yarshray 2003-03-25
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一样的东西
DllImportAttribute是这个特性的类
[DllImport]是这特性的描述。
DllImportAttribute是这个特性的类
[DllImport]是这特性的描述。
