iOS检查和创建文件夹的C++代码

要在iOS上检查和创建文件夹，可以使用Objective-C来调用C++代码。下面是一个示例：

首先，创建一个名为"FileManagerWrapper.h"的头文件，内容如下：

#import <Foundation/Foundation.h>

@interface FileManagerWrapper : NSObject

+ (BOOL)checkAndCreateFolder:(NSString *)folderPath;

@end

接下来，创建一个名为"FileManagerWrapper.mm"的实现文件，内容如下：

#import "FileManagerWrapper.h"

@implementation FileManagerWrapper

+ (BOOL)checkAndCreateFolder:(NSString *)folderPath {
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isDirectory;
    BOOL folderExists = [fileManager fileExistsAtPath:folderPath isDirectory:&isDirectory];
    
    if (!folderExists || !isDirectory) {
        NSError *error;
        BOOL success = [fileManager createDirectoryAtPath:folderPath withIntermediateDirectories:YES attributes:nil error:&error];
        if (!success) {
            NSLog(@"Failed to create folder: %@", error.localizedDescription);
        }
        return success;
    }
    
    return YES;
}

@end

现在，你可以在你的C++代码中调用这个Objective-C++的封装类，以检查和创建文件夹。下面是一个示例：

#include <iostream>
#include <objc/objc.h>
#include <objc/runtime.h>

extern "C" {
    BOOL checkAndCreateFolder(const char *folderPath) {
        Class FileManagerWrapperClass = objc_getClass("FileManagerWrapper");
        SEL checkAndCreateFolderSelector = sel_registerName("checkAndCreateFolder:");
        
        if (!FileManagerWrapperClass || !checkAndCreateFolderSelector) {
            std::cout << "Failed to find FileManagerWrapper class or checkAndCreateFolder selector" << std::endl;
            return false;
        }
        
        id fileManagerWrapper = [FileManagerWrapperClass new];
        NSString *nsFolderPath = [NSString stringWithUTF8String:folderPath];
        
        NSMethodSignature *signature = [FileManagerWrapperClass methodSignatureForSelector:checkAndCreateFolderSelector];
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
        [invocation setSelector:checkAndCreateFolderSelector];
        [invocation setArgument:&nsFolderPath atIndex:2];
        [invocation invokeWithTarget:fileManagerWrapper];
        
        BOOL result;
        [invocation getReturnValue:&result];
        
        return result;
    }
}

int main() {
    const char *folderPath = "/path/to/folder";
    bool success = checkAndCreateFolder(folderPath);
    
    if (success) {
        std::cout << "Folder created successfully" << std::endl;
    } else {
        std::cout << "Failed to create folder" << std::endl;
    }
    
    return 0;
}

注意，在C++代码中，我们使用Objective-C的运行时库来获取封装类和选择器，然后使用NSInvocation来调用封装类的方法。

这样，你就可以在iOS上使用C++代码来检查和创建文件夹了。