在C#中使用GDI的简单总结

IntPtrpTarget=e.Graphics.GetHdc();

IntPtrpSource=CreateCompatibleDC(pTarget);

IntPtrpOrig=SelectObject(pSource,drawBmp.GetHbitmap());

GDIApi.StretchBlt(pTarget,0,0,this.Width,this.Height,pSource,0,0,drawWidth,drawHeight,TernaryRasterOperations.SRCCOPY);

IntPtrpNew=SelectObject(pSource,pOrig);

DeleteObject(pNew);

DeleteDC(pSource);

e.Graphics.ReleaseHdc(pTarget);

[DllImport("gdi32.dll")]

publicstaticexternintSetBkMode(IntPtrhdc,intiBkMode);

publicconstintTRANSPARENT=1;

publicconstintOPAQUE=2;

[DllImport("gdi32.dll",CharSet=CharSet.Auto)]

publicstaticexternboolGetTextExtentPoint(IntPtrhdc,stringlpString,

intcbString,refSizelpSize);

[DllImport("Gdi32.dll",CharSet=CharSet.Auto)]

publicstaticexternboolGetTextMetrics(IntPtrhdc,outTEXTMETRIClptm);

[DllImport("gdi32.dll")]

publicstaticexternboolGetCharABCWidthsFloatW(IntPtrhdc,uintiFirstChar,uintiLastChar,[Out]ABCFloat[]lpABCF);

[DllImport("gdi32.dll",CharSet=CharSet.Auto)]

publicstaticexternboolGetCharWidth32(IntPtrhdc,uintiFirstChar,uintiLastChar,

[Out]int[]lpBuffer);

[DllImport("gdi32.dll",CharSet=CharSet.Auto)]

publicstaticexternboolTextOutW(IntPtrhdc,intnXStart,intnYStart,

stringlpString,intcbString);

[DllImport("user32.dll",CharSet=CharSet.Unicode)]

publicstaticexternintDrawText(IntPtrhdc,stringlpStr,intnCount,refRectlpRect,dwDTFormatwFormat);

privateInt32EnumFontCallBack(refENUMLOGFONTEXlpelfe,IntPtrlpntme,intFontType,intlParam)

{

//Debug.WriteLine(lpelfe.elfFullName);

if(lpelfe.elfFullName.Substring(0,1)!="@")

{

if(!sysFontList.Contains(lpelfe.elfFullName))

{

sysFontList.Add(lpelfe.elfFullName);

}

}

return1;

}

LOGFONTlogfont=newLOGFONT();

logfont.lfCharSet=FontCharSet.DEFAULT_CHARSET;

Bitmapbmp=newBitmap(10,10);

Graphicsg=Graphics.FromImage(bmp);

IntPtrhDC=g.GetHdc();

EnumFontFamilies.EnumFontFamiliesEx(hDC,logfont,EnumFontCallBack,IntPtr.Zero,0);

g.ReleaseHdc(hDC);

g.Dispose();

bmp.Dispose();

publicclassEnumFontFamilies

{

publicconstintLF_FACESIZE=32;

publicdelegateintEnumFontExDelegate(refENUMLOGFONTEXlpelfe,IntPtrlpntme,intFontType,intlParam);

[DllImport("gdi32.dll",EntryPoint="EnumFontFamiliesEx",CharSet=CharSet.Unicode)]

publicstaticexternintEnumFontFamiliesEx(IntPtrhDC,[In]LOGFONTlogFont,EnumFontExDelegateenumFontExCallback,

IntPtrlParam,uintdwFlags);

}

[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Auto)]

publicstructENUMLOGFONTEX
{

publicLOGFONTelfLogFont;

[MarshalAs(UnmanagedType.ByValTStr,SizeConst=32)]

publicstringelfFullName;

[MarshalAs(UnmanagedType.ByValTStr,SizeConst=32)]

publicstringelfStyle;

[MarshalAs(UnmanagedType.ByValTStr,SizeConst=32)]

publicstringelfScript;

}

[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Auto)]

publicclassLOGFONT
{

publicintlfHeight;

publicintlfWidth;

publicintlfEscapement;

publicintlfOrientation;

publicFontWeightlfWeight;

[MarshalAs(UnmanagedType.U1)]

publicboollfItalic;

[MarshalAs(UnmanagedType.U1)]

publicboollfUnderline;

[MarshalAs(UnmanagedType.U1)]

publicboollfStrikeOut;

publicFontCharSetlfCharSet;

publicFontPrecisionlfOutPrecision;

publicFontClipPrecisionlfClipPrecision;

publicFontQualitylfQuality;

publicFontPitchAndFamilylfPitchAndFamily;

[MarshalAs(UnmanagedType.ByValTStr,SizeConst=32)]

publicstringlfFaceName;

publicoverridestringToString()
{

StringBuildersb=newStringBuilder();

sb.Append("LOGFONT\n");

sb.AppendFormat("lfHeight:{0}\n",lfHeight);

sb.AppendFormat("lfWidth:{0}\n",lfWidth);

sb.AppendFormat("lfEscapement:{0}\n",lfEscapement);

sb.AppendFormat("lfOrientation:{0}\n",lfOrientation);

sb.AppendFormat("lfWeight:{0}\n",lfWeight);

sb.AppendFormat("lfItalic:{0}\n",lfItalic);

sb.AppendFormat("lfUnderline:{0}\n",lfUnderline);

sb.AppendFormat("lfStrikeOut:{0}\n",lfStrikeOut);

sb.AppendFormat("lfCharSet:{0}\n",lfCharSet);

sb.AppendFormat("lfOutPrecision:{0}\n",lfOutPrecision);

sb.AppendFormat("lfClipPrecision:{0}\n",lfClipPrecision);

sb.AppendFormat("lfQuality:{0}\n",lfQuality);

sb.AppendFormat("lfPitchAndFamily:{0}\n",lfPitchAndFamily);

sb.AppendFormat("lfFaceName:{0}\n",lfFaceName);

returnsb.ToString();

}

}

publicenumFontWeight:int
{

FW_DONTCARE=0,

FW_THIN=100,

FW_EXTRALIGHT=200,

FW_LIGHT=300,

FW_NORMAL=400,

FW_MEDIUM=500,

FW_SEMIBOLD=600,

FW_BOLD=700,

FW_EXTRABOLD=800,

FW_HEAVY=900,

}

publicenumFontCharSet:byte
{

ANSI_CHARSET=0,

DEFAULT_CHARSET=1,

SYMBOL_CHARSET=2,

SHIFTJIS_CHARSET=128,

HANGEUL_CHARSET=129,

HANGUL_CHARSET=129,

GB2312_CHARSET=134,

CHINESEBIG5_CHARSET=136,

OEM_CHARSET=255,

JOHAB_CHARSET=130,

HEBREW_CHARSET=177,

ARABIC_CHARSET=178,

GREEK_CHARSET=161,

TURKISH_CHARSET=162,

VIETNAMESE_CHARSET=163,

THAI_CHARSET=222,

EASTEUROPE_CHARSET=238,

RUSSIAN_CHARSET=204,

MAC_CHARSET=77,

BALTIC_CHARSET=186,

}

publicenumFontPrecision:byte
{

OUT_DEFAULT_PRECIS=0,

OUT_STRING_PRECIS=1,

OUT_CHARACTER_PRECIS=2,

OUT_STROKE_PRECIS=3,

OUT_TT_PRECIS=4,

OUT_DEVICE_PRECIS=5,

OUT_RASTER_PRECIS=6,

OUT_TT_ONLY_PRECIS=7,

OUT_OUTLINE_PRECIS=8,

OUT_SCREEN_OUTLINE_PRECIS=9,

OUT_PS_ONLY_PRECIS=10,

}

publicenumFontClipPrecision:byte
{

CLIP_DEFAULT_PRECIS=0,

CLIP_CHARACTER_PRECIS=1,

CLIP_STROKE_PRECIS=2,

CLIP_MASK=0xf,

CLIP_LH_ANGLES=(1<<4),

CLIP_TT_ALWAYS=(2<<4),

CLIP_DFA_DISABLE=(4<<4),

CLIP_EMBEDDED=(8<<4),

}

publicenumFontQuality:byte
{

DEFAULT_QUALITY=0,

DRAFT_QUALITY=1,

PROOF_QUALITY=2,

NONANTIALIASED_QUALITY=3,

ANTIALIASED_QUALITY=4,

CLEARTYPE_QUALITY=5,

CLEARTYPE_NATURAL_QUALITY=6,

}

[Flags]

publicenumFontPitchAndFamily:byte
{

DEFAULT_PITCH=0,

FIXED_PITCH=1,

VARIABLE_PITCH=2,

FF_DONTCARE=(0<<4),

FF_ROMAN=(1<<4),

FF_SWISS=(2<<4),

FF_MODERN=(3<<4),

FF_SCRIPT=(4<<4),

FF_DECORATIVE=(5<<4),

}

///<summary>

///EnumerationfortherasteroperationsusedinBitBlt.

///InC++theseareactually#define.Buttousethese

///constantswithC#,anewenumerationtypeisdefined.

///</summary>

publicenumTernaryRasterOperations
{

SRCCOPY=0x00CC0020,/*dest=source*/

SRCPAINT=0x00EE0086,/*dest=sourceORdest*/

SRCAND=0x008800C6,/*dest=sourceANDdest*/

SRCINVERT=0x00660046,/*dest=sourceXORdest*/

SRCERASE=0x00440328,/*dest=sourceAND(NOTdest)*/

NOTSRCCOPY=0x00330008,/*dest=(NOTsource)*/

NOTSRCERASE=0x001100A6,/*dest=(NOTsrc)AND(NOTdest)*/

MERGECOPY=0x00C000CA,/*dest=(sourceANDpattern)*/

MERGEPAINT=0x00BB0226,/*dest=(NOTsource)ORdest*/

PATCOPY=0x00F00021,/*dest=pattern*/

PATPAINT=0x00FB0A09,/*dest=DPSnoo*/

PATINVERT=0x005A0049,/*dest=patternXORdest*/

DSTINVERT=0x00550009,/*dest=(NOTdest)*/

BLACKNESS=0x00000042,/*dest=BLACK*/

WHITENESS=0x00FF0062,/*dest=WHITE*/

};

[Flags]

publicenumdwDTFormat:int
{

DT_TOP=0,DT_LEFT=0x00000000,DT_CENTER=0x00000001,DT_RIGHT=0x00000002,

DT_VCENTER=0x00000004,DT_BOTTOM=0x00000008,DT_WORDBREAK=0x00000010,DT_SINGLELINE=0x00000020,

DT_EXPANDTABS=0x00000040,DT_TABSTOP=0x00000080,DT_NOCLIP=0x00000100,DT_EXTERNALLEADING=0x00000200,

DT_CALCRECT=0x00000400,DT_NOPREFIX=0x00000800,DT_INTERNAL=0x00001000

};

publicstructRect
{

publicintLeft,Top,Right,Bottom;

publicRect(Rectangler)
{

this.Left=r.Left;

this.Top=r.Top;

this.Bottom=r.Bottom;

this.Right=r.Right;

}

}

[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Auto)]

publicstructTEXTMETRIC
{

publicInt32tmHeight;

publicInt32tmAscent;

publicInt32tmDescent;

publicInt32tmInternalLeading;

publicInt32tmExternalLeading;

publicInt32tmAveCharWidth;

publicInt32tmMaxCharWidth;

publicInt32tmWeight;

publicInt32tmOverhang;

publicInt32tmDigitizedAspectX;

publicInt32tmDigitizedAspectY;

publicchartmFirstChar;

publicchartmLastChar;

publicchartmDefaultChar;

publicchartmBreakChar;

publicbytetmItalic;

publicbytetmUnderlined;

publicbytetmStruckOut;

publicbytetmPitchAndFamily;

publicbytetmCharSet;

}