imageWithContentsOfFile,
2) 如何將解碼後的RGB24數據顯示到UIImage上
#define SCREEN_METRIC_WIDTH 176
#define SCREEN_METRIC_HEIGHT 144
int i = 0;
int bitsPerComponent = 8;
int bitsPerPixel = 24;
int bytesPerRow = 3 * SCREEN_METRIC_WIDTH;
NSInteger myLCDDataLength =
SCREEN_METRIC_WIDTH * SCREEN_METRIC_HEIGHT * 3;
CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
CGBitmapInfo bmpInof = kCGBitmapByteOrderDefault;
CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;
CGDataProviderRef provider = nil;
//rgb_image = malloc(SCREEN_METRIC_WIDTH*SCREEN_METRIC_HEIGHT*3)
provider = CGDataProviderCreateWithData(NULL, rgb_image, myLCDDataLength, NULL);
CGImageRef cgImage= CGImageCreate(SCREEN_METRIC_WIDTH,SCREEN_METRIC_HEIGHT,
bitsPerComponent,
bitsPerPixel,
bytesPerRow,
colorSpaceRef,
bmpInof,
provider,
NULL,
NO,
renderingIntent);
CGColorSpaceRelease(colorSpaceRef);
UIImage *image = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
CGDataProviderRelease(provider);
3) 把UIImage數據保存文件
//get now time
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy_MMdd_HHMMSS"];
NSString *dateTime = [formatter stringFromDate:[NSDate date]];
NSString* filepath = [Utilities documentsPath:[NSString stringWithFormat:@"snapshot%@.png", dateTime]];
NSLog(@"save png, time:%@", filepath);
[formatter release];
//save UIImage to file in PNG format
NSData *imageData = NULL;
imageData = UIImagePNGRepresentation(cur_uiImage);
if ((imageData == nil) || ([imageData length] <= 0))
return 0;
[imageData writeToFile:filepath atomically:YES];
//直接保存圖片到相冊
//UIImageWriteToSavedPhotosAlbum(cur_uiImage, nil, nil, nil);
4) 截取整個UIView並保存文件
UIView *view = [[[[[UIApplication sharedApplication] windows] objectAtIndex:1] subviews] lastObject];//獲得某個window的某個subView
NSInteger index = 0;//用來給保存的png命名
for (UIView *subView in [view subviews]) {//遍歷這個view的subViews
if ([subView isKindOfClass:NSClassFromString(@"UIImageView")] || [subView isKindOfClass:NSClassFromString(@"UIThreePartButton")]) {//找到自己需要的subView
//支持retina高分的關鍵
if(UIGraphicsBeginImageContextWithOpti***** != NULL)
{
UIGraphicsBeginImageContextWithOpti*****(subView.frame.size, NO, 0.0);
} else {
UIGraphicsBeginImageContext(subView.frame.size);
}
//獲取圖像
[subView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//保存圖像
NSString *path = [NSHomeDirectory() stringByAppendingFormat:@"/%d.png",index];
if ([UIImagePNGRepresentation(image) writeToFile:path atomically:YES]) {
index += 1;
NSLog(@"Succeeded!");
}
else {
NSLog(@"Failed!");
}
}
}