nenaVFP下更改图像分辨率(DPI)
编程方法：新建立一个位图，接着把新建立的位图设置成需要的分辨率，然后把需要修改的图片写到新文图上，最后保存。
DECLARE Long GdipBitmapSetResolution IN GDIPLUS.DLL Long nBitmap, Single xdpi, Single ydpi
DECLARE INTEGER GdipLoadImageFromFile IN gdiplus.DLL STRING wFilename, INTEGER @nImage
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DECLARE INTEGER GdipSaveImageToFile IN gdiplus.DLL ;general是什么意思
INTEGER nImage, STRING wFilename, STRING qEncoder, INTEGER nEncoderParamsPtr
DECLARE Long GdipDispoImage IN Gdiplus.dll Long nativeImage
DECLARE INTEGER GdipCreateBitmapFromScan0 IN gdiplus.DLL ;
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dorian gray
INTEGER nWidth, INTEGER nHeight, INTEGER nStride,INTEGER nPixelFormat,;
STRING @ cScan0, INTEGER @ nImage
DECLARE INTEGER GdipGetImageHeight IN gdiplus INTEGER img,INTEGER @imgheight
DECLARE INTEGER GdipGetImageWidth IN gdiplus INTEGER img,INTEGER @imgwidth
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DECLARE INTEGER GdipGetImageGraphicsContext IN gdiplus.DLL INTEGER nImage,INTEGER @nGraphics
adulterateDECLARE INTEGER GdipDrawImageRect IN gdiplus.DLL ;
INTEGER nGraphics, INTEGER nImage, SINGLE,SINGLE,SINGLE,SINGLE
STORE 0 TO uHwnd,uHeight,uWidth,nBitmap,nGraphics
lqEncoderClsID_JPG=0h01F47C55041AD3119A730000F81EF32E
GDIPLUS_PIXELFORMAT_32bppARGB=0x0026200A
xdpi=350&&考研准考证号忘了怎么查询水平分辨率
ydpi=350&&垂直分辨率
Sourcefile=”旧图片.toefl考试jpg”
Newfile=”新图片.jpg”
GdipLoadImageFromFile(STRCONV(Sourcefile+0h00,5),@uhwnd)
carryGdipGetImageHeight(uhwnd,@uHeight)
GdipGetImageWidth(uhwnd,@uWidth)
GdipCreateBitmapFromScan0(uWidth,uHeight,0,GDIPLUS_PIXELFORMAT_32bppARGB,0,@nBitmap)
GdipGetImageGraphicsContext(nBitmap,@nGraphics)
GdipBitmapSetResolution(nBitmap,xdpi,ydpi)
GdipDrawImageRect(nGraphics,uHwnd,0,0,uWidth,uHeight)
GdipSaveImageToFile(nBitmap,STRCONV(Newfile +0h00,5),lqEncoderClsID_JPG,0)
GdipDispoImage(uhwnd)
GdipDispoImage(nBitmap)
