c++ fopen fstream 打开中文路径 获取文件大小

c++ fopen fstream 打开中文路径 获取文件大小

环境需求

需要有iconv的支持

在windows上我用的msys2，安装了mingw，gcc，iconv

若是使用的clion，那么在clionCmakelist中需要添加:

test 为项目名称，改为你的项目名称

target_link_libraries(test iconv)

代码

#include <iostream>
#include <stdio.h>
#include <iconv.h>
#include <string>
#include <string.h>
#include <fstream>

using namespace std;

int UTF8ToGBK(char* input, size_t charInPutLen, char* output, size_t charOutPutLen)
{
    int ret =0;
    iconv_t cd;
    cd = iconv_open("GBK","utf-8");
    ret = iconv(cd, &input, &charInPutLen, &output, &charOutPutLen);
    iconv_close(cd);
    return ret;
}

int UTF8ToGBK(const string& input, string& output)
{
    int ret =0;
    size_t charInPutLen = input.length();
    if( charInPutLen == 0)
        return 0;
    char *pSource =(char *)input.c_str();
    size_t charOutPutLen = 2*charInPutLen;
    char *pTemp = new char[charOutPutLen];
    memset(pTemp,0,2*charInPutLen);

    iconv_t cd;
    char *pOut = pTemp ;
    cd = iconv_open("utf-8", "GBK");
    ret = iconv(cd, &pSource, &charInPutLen, &pTemp, &charOutPutLen);
    iconv_close(cd);
    output = pOut;
    delete []pOut;//注意这里，不能使用delete []pTemp, iconv函数会改变指针pTemp的值
    return ret;
}

int GBKToUTF8(char* input, size_t charInPutLen, char* output, size_t charOutPutLen)
{
    int ret = 0;
    iconv_t cd;
    cd = iconv_open("utf-8", "GBK");
    ret = iconv(cd, &input, &charInPutLen, &output, &charOutPutLen);
    iconv_close(cd);
    return ret;
}


int GBKToUTF8(const string& input, string& output)
{
    int ret = 0;
    size_t charInPutLen = input.length();
    if( charInPutLen == 0)
        return 0;

    size_t charOutPutLen = 2*charInPutLen+1;
    char *pTemp = new char[charOutPutLen];
    memset(pTemp,0,charOutPutLen);
    iconv_t cd;
    char *pSource =(char *)input.c_str();
    char *pOut = pTemp;
    cd = iconv_open("utf-8", "GBK");
    ret = iconv(cd, &pSource, &charInPutLen, &pTemp, &charOutPutLen);
    iconv_close(cd);
    output= pOut;
    delete []pOut; //注意这里，不能使用delete []pTemp, iconv函数会改变指针pTemp的值
    return ret;
}

long get_file_size(string path)
{
    long file_size = 0;
    const int max_path_len = 1000;
    if(path.size()>=1000)return file_size;
    char path1[max_path_len], path2[max_path_len];
    memset(path1, 0, sizeof(path1));
    memset(path2, 0, sizeof(path2));
    memcpy(path1, path.c_str(), path.size());
    UTF8ToGBK(path1, max_path_len, path2, max_path_len);

    fstream infile;
    infile.open(path2, ios::in|ios::binary);
    if(infile.is_open())
    {
        infile.seekg(0, ios::end);
        file_size = infile.tellg();
    }
    infile.close();
    return file_size;
}

long get_file_size2(string path)
{
    long file_size = 0;
    const int max_path_len = 1000;
    if(path.size()>=1000)return file_size;
    char path1[max_path_len], path2[max_path_len];
    memset(path1, 0, sizeof(path1));
    memset(path2, 0, sizeof(path2));
    memcpy(path1, path.c_str(), path.size());
    UTF8ToGBK(path1, max_path_len, path2, max_path_len);

    FILE *fp = fopen(path2, "rb");
    if(fp!= nullptr)
    {
        fseek(fp, 0, SEEK_END);
        file_size = ftell(fp);
    }
    fclose(fp);
    return file_size;
}

int main()
{
    string path = "C:\\Users\\Amazing\\Pictures\\图片\\201001110256-3_1.jpg";
    long size = get_file_size(path);
    cout<<size<<endl;
    return 0;
}