快速访问C Struct [英] Swift access to C Struct

问题描述

我正在开发一个OS X Swift应用程序，用于解析cvs文件.它在Objective-C中成功运行.然后我改用Swift，为了提高性能，我用C开发了解析/导入引擎.它的速度是Swift或Objective-C的5倍-很好.但是我很难在C和Swift之间交换数据-尤其是使用Struct:

I am developing a OS X Swift app for parsing cvs files. It runs successfully in Objective-C. Then I changed to Swift and for performance improvements I developed the parse/import engine in C. It is 5 times faster as in Swift or Objective-C - nice. But I have trouble to exchange the data between C and Swift - especially with Struct:

BridgingHeader:

#include "ToolBoxC.h"

ToolBoxC.h:

void loadFile(const char *fileName, const char *delimiters, const char *xRegex, int xRegexColumn, int xColumn, int yColumn, int xRow, int yRowShift, bool collectStrings);

typedef struct {

                    char **headerArray;
                    int numberHeaderRows;
                    char **dateArray;
                    int numberDateRows;
                    int **valueArray;
                    char ***stringArray;
                    int numberValueRows;
                    int numberValueColums;
        } FileStruct;

typedef struct {

                    FileStruct fileContent[10000];
} FilesStruct;

struct FilesStruct filesContent;

ToolBoxC.c:

struct FileStruct {

    char **headerArray;
    int numberHeaderRows;
    char **dateArray;
    int numberDateRows;
    int **valueArray;
    char ***stringArray;
    int numberValueRows;
    int numberValueColums;
};

struct FilesStruct {

    struct FileStruct fileContent[10000];
};

void loadFile(const char *fileName, const char *delimiters, const char *xRegex, int xRegexColumn, int xColumn, int yColumn, int xRow, int yRowShift, bool collectStrings) {

// some stuff

    struct FileStruct fileContent;

    fileContent.headerArray = headerArray;
    fileContent.numberHeaderRows = numberHeaderRows;
    fileContent.dateArray = dateArray;
    fileContent.numberDateRows = numberDateRows;
    fileContent.valueArray = valueArray;
    fileContent.stringArray = stringArray;
    fileContent.numberValueRows = numberValueRows;
    fileContent.numberValueColums = numberValueColumns;

    filesContent.fileContent[numberFiles] = fileContent;

return;
}

所有解析的数据都存储在 struct FilesStruct filesContent 中.通过使用Swift的参数调用函数loadFile()来开始解析.很好解析也可以.但是如何从Swift访问 struct FilesStruct filesContent 中的数据?

All the parsed data are stored in struct FilesStruct filesContent. The parsing is started by calling the function loadFile() with parameters from Swift. That works fine. Also the parsing is OK. But how can I access to the data in struct FilesStruct filesContent from Swift?

谢谢，马蒂亚斯.

推荐答案

尝试一下:

ToolBoxC.h

#include <stdbool.h>

struct FileStruct {
    char **headerArray;
    int numberHeaderRows;
    char **dateArray;
    int numberDateRows;
    int **valueArray;
    char ***stringArray;
    int numberValueRows;
    int numberValueColums;
};

extern struct FileStruct **loadedFiles;

void loadFile(const char *fileName, const char *delimiters, const char *xRegex, int xRegexColumn, int xColumn, int yColumn, int xRow, int yRowShift, bool collectStrings);

ToolBoxC.c

#include <stdlib.h>
#include "ToolBoxC.h"

#define MaxFiles 10000

struct FileStruct **loadedFiles;

void loadFile(const char *fileName, const char *delimiters, const char *xRegex, int xRegexColumn, int xColumn, int yColumn, int xRow, int yRowShift, bool collectStrings) {

    static int nextIndex = 0;

    if (loadedFiles == 0)
        loadedFiles = malloc(MaxFiles * sizeof(*loadedFiles));

    struct FileStruct *file = malloc(sizeof(struct FileStruct));
    file->numberDateRows = xRow;

    loadedFiles[nextIndex++] = file;
}

快速测试方法

func loadFilesTest() -> Void {
    for var i:Int32 = 0; i < 10; ++i {
        loadFile("", "", "", 0, 0, 0, i, 0, true)
    }
    for var j = 0; j < 10; ++j {
        let pointer = UnsafePointer<FileStruct>(loadedFiles[j])
        print("Number of date rows = \(pointer.memory.numberDateRows)")
    }
}

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