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我是IOS開發新手,但是我面對的這個問題對我來說似乎不合邏輯。我在ViewController.h和ViewController.mm(更改爲.mm,因爲我使用C++)中聲明瞭一個函數,但是當我在ViewController.mm中調用它時,我得到了use of undeclared identifier
錯誤。函數在目標中未被識別-C
下面是在頭文件中的聲明:
#import <UIKit/UIKit.h>
#import <opencv2/highgui/cap_ios.h>
using namespace cv;
@interface ViewController : UIViewController<CvVideoCameraDelegate>
{
IBOutlet UIImageView* imageview;
CvVideoCamera* videoCamera;
IBOutlet UILabel *label;
}
- (UIImage *) CVMatToImage:(cv::Mat) matrice;
@property (nonatomic, retain) CvVideoCamera* videoCamera;
-(IBAction)cameraStart:(id)sender;
-(IBAction)cameraStop:(id)sender;
@end
,並在.mm文件中的定義:
- (UIImage *) CVMatToImage:(cv::Mat) matrice
{
NSData *data = [NSData dataWithBytes:matrice.data length:matrice.elemSize()*matrice.total()];
CGColorSpaceRef colorSpace;
CGBitmapInfo bitmapInfo;
if (matrice.elemSize() == 1) {
colorSpace = CGColorSpaceCreateDeviceGray();
bitmapInfo = kCGImageAlphaNone | kCGBitmapByteOrderDefault;
} else {
colorSpace = CGColorSpaceCreateDeviceRGB();
bitmapInfo = kCGBitmapByteOrder32Little | (
matrice.elemSize() == 3? kCGImageAlphaNone : kCGImageAlphaNoneSkipFirst
);
}
CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)data);
// Creating CGImage from cv::Mat
CGImageRef imageRef = CGImageCreate(
matrice.cols, //width
matrice.rows, //height
8, //bits per component
8 * matrice.elemSize(), //bits per pixel
matrice.step[0], //bytesPerRow
colorSpace, //colorspace
bitmapInfo, // bitmap info
provider, //CGDataProviderRef
NULL, //decode
false, //should interpolate
kCGRenderingIntentDefault //intent
);
// Getting UIImage from CGImage
UIImage *finalImage = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpace);
return finalImage;
}
但是,當我把它稱爲一個IBAction爲內我得到一個錯誤
-(IBAction)cameraStop:(id)sender
{
[self.videoCamera stop];
//////////////////////
// Don't forget to process image here
//////////////////////
UIImage *finalImageToOCR = CVMatToImage(cvMatrice);
[imageview setImage:finalImageToOCR];
G8Tesseract *tesseract = [[G8Tesseract alloc] initWithLanguage:@"fra"];
[tesseract setImage:finalImageToOCR];
[tesseract recognize];
NSLog(@"%@", [tesseract recognizedText]);
label.text = [NSString stringWithFormat:[tesseract recognizedText]];
}
是的,我只是爲自己的問題寫了一個答案。我用一個ViewController的實例解決了這個問題。 現在我已經把它改成了一個你建議的功能,並且它完美地工作。非常感謝你! – user3491634