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UIGraphicsBeginImageContextWithOptions(pageView.page.bounds.size,YES, zoomScale);

[pageView.page.layerrenderInContext:UIGraphicsGetCurrentContext()];

UIImage*uiImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

2.

[objc]view plaincopy

- (UIImage*) glToUIImage {

DWScrollView*pageView = [selfgetActivePageView];

pageView.page.backgroundColor= [UIColorclearColor];

// self.backgroundColor=[UIColor clearColor];

NSInteger myDataLength =3320*3308*4;

// allocate array and read pixels into it.

GLubyte*buffer = (GLubyte*) malloc(myDataLength);

glReadPixels(0,0,320,308, GL_RGBA, GL_UNSIGNED_BYTE, buffer);

// gl renders "upside down" so swap top to bottom into new array.

// there's gotta be a better way, but this works.

GLubyte*buffer2= (GLubyte*) malloc(myDataLength);

for(inty =0; y <308; y++)

{

for(intx =0; x <3320*4; x++)

{

if(buffer[y*44*320+x]==0)

buffer2[(307- y) *3320*4+x]=1;

else

buffer2[(307- y) *3320*4+x] = buffer[y*44*320+x];

}

}

// make data provider with data.

CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, buffer2, myDataLength,NULL);

// prep the ingredients

intbitsPerComponent =8;

intbitsPerPixel =32;

intbytesPerRow =44*320;

CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();

CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;

CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;

// make the cgimage

CGImageRef

imageRef = CGImageCreate(320,308, bitsPerComponent, bitsPerPixel,

bytesPerRow, colorSpaceRef, bitmapInfo, provider,NULL,NO,

renderingIntent);

// then make the uiimage from that

UIImage*myImage = [UIImageimageWithCGImage:imageRef];

UIImageWriteToSavedPhotosAlbum(myImage,nil,nil,nil);

returnmyImage;

}

3.

[objc]view plaincopy

// get screen

- (void)grabScreen {

unsignedcharbuffer[320*480*4];

glReadPixels(0,0,320,480,GL_RGBA,GL_UNSIGNED_BYTE,&buffer);

CGDataProviderRef ref = CGDataProviderCreateWithData(NULL, &buffer,320*480*4,NULL);

CGImageRefiref =CGImageCreate(320,480,8,32,320*4,CGColorSpaceCreateDeviceRGB(),kCGBitmapByteOrderDefault,ref,NULL,true,kCGRenderingIntentDefault);

CGFloat width = CGImageGetWidth(iref);

CGFloat height = CGImageGetHeight(iref);

size_tlength = width*height*4;

uint32_t*pixels = (uint32_t*)malloc(length);

CGContextRef

context = CGBitmapContextCreate(pixels, width, height,8,320*4,

CGImageGetColorSpace(iref), kCGImageAlphaLast |

kCGBitmapByteOrder32Big);

CGContextTranslateCTM(context,0.0, height);

CGContextScaleCTM(context,1.0, -1.0);

CGContextDrawImage(context, CGRectMake(0.0,0.0, width, height), iref);

CGImageRef outputRef = CGBitmapContextCreateImage(context);

UIImage*outputImage = [UIImageimageWithCGImage:outputRef];

UIImageWriteToSavedPhotosAlbum(outputImage,nil,nil,nil);

CGContextRelease(context);

CGImageRelease(iref);

CGDataProviderRelease(ref);

}

4.

[objc]view plaincopy

CGImageRef UIGetScreenImage();

voidSaveScreenImage(NSString*path)

{

NSAutoreleasePool*pool = [[NSAutoreleasePoolalloc]init];

CGImageRef cgImage = UIGetScreenImage();

voidvoid*imageBytes =NULL;

if(cgImage ==NULL) {

CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();

imageBytes = malloc(3320*4480*4);

CGContextRef

context = CGBitmapContextCreate(imageBytes,320,480,8,3320*4,

colorspace, kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Big);

CGColorSpaceRelease(colorspace);

for(UIWindow*window in [[UIApplicationsharedApplication]windows]) {

CGRect bounds = [windowbounds];

CALayer*layer = [windowlayer];

CGContextSaveGState(context);

if([layercontentsAreFlipped]) {

CGContextTranslateCTM(context,0.0f, bounds.size.height);

CGContextScaleCTM(context,1.0f, -1.0f);

}

[layerrenderInContext:(CGContextRef)context];

CGContextRestoreGState(context);

}

cgImage = CGBitmapContextCreateImage(context);

CGContextRelease(context);

}

NSData*pngData = UIImagePNGRepresentation([UIImageimageWithCGImage:cgImage]);

CGImageRelease(cgImage);

if(imageBytes)

free(imageBytes);

[pngDatawriteToFile:pathatomically:YES];

[poolrelease];

}

5.

[objc]view plaincopy

+ (UIImage*)imageWithScreenContents

{

CGImageRef cgScreen = UIGetScreenImage();

if(cgScreen) {

UIImage*result = [UIImageimageWithCGImage:cgScreen];

CGImageRelease(cgScreen);

returnresult;

}

returnnil;

}

在程序中如何把两张图片合成为一张图片

- (UIImage*)addImage:(UIImage*)image1toImage:(UIImage*)image2{

UIGraphicsBeginImageContext(image1.size);

// Draw image1

[image1drawInRect:CGRectMake(0,0, image1.size.width, image1.size.height)];

// Draw image2

[image2drawInRect:CGRectMake(0,0, image2.size.width, image2.size.height)];

UIImage*resultingImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

returnresultingImage;

}