如何用石英搜索pdf文档中的文本 [英] How to search text in pdf document with quartz

问题描述

我正在使用石英来显示pdf。我需要获取搜索文本存在的页面索引。有人可以帮帮我吗？谢谢。

I'm using quartz to display pdf. I need to get the indexes of pages where my searching text exists. Anyone can help me? Thanks.

解决方案：
有一个代码示例从页面中提取文本并检查序列。

Solution: There is a sample of code that extracts a text from the page and check it for the sequences.

#import <Foundation/Foundation.h>

@interface PDFSearcher : NSObject {
    CGPDFOperatorTableRef table;
    NSMutableString *currentData;
}

@property (nonatomic, retain) NSMutableString * currentData;
-(id)init;
-(BOOL)page:(CGPDFPageRef)inPage containsString:(NSString *)inSearchString;

@end

#import "PDFSearcher.h"

@implementation PDFSearcher
@synthesize currentData;
void arrayCallback(CGPDFScannerRef inScanner, void *userInfo)
{
    PDFSearcher * searcher = (PDFSearcher *)userInfo;

    CGPDFArrayRef array;

    bool success = CGPDFScannerPopArray(inScanner, &array);

    for(size_t n = 0; n < CGPDFArrayGetCount(array); n += 2)
    {
        if(n >= CGPDFArrayGetCount(array))
            continue;

        CGPDFStringRef string;
        success = CGPDFArrayGetString(array, n, &string);
        if(success)
        {
            NSString *data = (NSString *)CGPDFStringCopyTextString(string);
            [searcher.currentData appendFormat:@"%@", data];
            [data release];
        }
    }
}

void stringCallback(CGPDFScannerRef inScanner, void *userInfo)
{
    PDFSearcher *searcher = (PDFSearcher *)userInfo;

    CGPDFStringRef string;

    bool success = CGPDFScannerPopString(inScanner, &string);

    if(success)
    {
        NSString *data = (NSString *)CGPDFStringCopyTextString(string);
        [searcher.currentData appendFormat:@"%@", data];
        [data release];

    }
}

-(id)init
{
    if(self = [super init])
    {
        table = CGPDFOperatorTableCreate();
        CGPDFOperatorTableSetCallback(table, "TJ", arrayCallback);
        CGPDFOperatorTableSetCallback(table, "Tj", stringCallback);
    }
    return self;
}

-(BOOL)page:(CGPDFPageRef)inPage containsString:(NSString *)inSearchString
{
    [self setCurrentData:[NSMutableString string]];
    CGPDFContentStreamRef contentStream = CGPDFContentStreamCreateWithPage(inPage);
    CGPDFScannerRef scanner = CGPDFScannerCreate(contentStream, table, self);
    bool ret = CGPDFScannerScan(scanner);
    CGPDFScannerRelease(scanner);
    CGPDFContentStreamRelease(contentStream);
    //NSLog(@"%u, %@", [self.currentData length], self.currentData);
    return ([[self.currentData uppercaseString] 
             rangeOfString:[inSearchString uppercaseString]].location != NSNotFound);
}
@end

推荐答案

使用CGPDFDocument，CGPDFPage和CGPDFScanner扫描并将页面内容解析为NSString。
然后使用NSString函数查找该页面上的文本。如果存在，则将相应的pagenumber存储在某个数组中。重复此扫描并解析pdf

Use CGPDFDocument, CGPDFPage and CGPDFScanner to scan and parse the contents of the page into NSString. Then use NSString function to find the text on that page. If it exists store the corresponding pagenumber in some array. Repeat this scanning and parsing in for loop for number of pages in the pdf

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