c文件合并

C 文件合并

问题描述

同类型文件进行合并，如下图对文件夹中的文件按文件名称顺序依次合并；

解决方法

1. 后缀匹配

void ForeachFile(const string path, const string &type, vector<string> &files)
{
    _finddata_t data;
    auto handle = _findfirst((path + "/*.*").c_str(), &data);
    if (handle == -1) {
    	PRINTF("can not read file!");
        return;
    }
    do {
        string s = data.name;
        if (data.attrib & _A_SUBDIR) {
            //PRINTF("dir: %s\n", s.c_str());
        }
        else {
            string s1 = "." + type;
            if (s.rfind(s1) == s.size() - s1.size()) {
                files.push_back(path + "/" + s);
            }
        }
    } while (_findnext(handle, &data) == 0);
    _findclose(handle);
}

2. 文件排序

string SplitPath(string fullPath)
{
    char szDrive[MAX_PATH] = {0};
    char szDir[MAX_PATH] = {0};
    char szFileName[MAX_PATH] = {0};
    char szExt[MAX_PATH] = {0};
    _splitpath(fullPath.c_str(), szDrive, szDir, szFileName, szExt);
    return string(szFileName);
}

bool SortEx(string x,  string y)
{
    int s1, s2;
    s1 = atoi(SplitPath(x).c_str());
    s2 = atoi(SplitPath(y).c_str());
    return s1 < s2;
}

3. 文件合并

  int makeOut(void) {
    char type[10] = "txt";
	char curPath[128];
	vector<string> fileNames;
	static char s_cBuf[1024*1024];
	
	getcwd(curPath, sizeof(curPath));

	/* search file */
    ForeachFile(curPath, type, fileNames);
    sort(fileNames.begin(),fileNames.end(), SortEx);

    /* make output */
	if (fileNames.size() > 0) {
	    FILE *fOut;
		fOut = fopen("Out.txt","wb");
		/* Find files of the same type */
	    for (auto f : fileNames) {
	    	FILE *fIn;
	    	if (fopen(f.c_str(), "wb") == NULL) {
				PRINTF("Open input file failed, aborting...\n");
			}

	    	fseek(fIn, 0L, SEEK_END);
	    	fread(s_cBuf, sizeof(char), ftell(fIn), fIn );
			fwrite(s_cBuf, sizeof(char), 1, fOut);

			fclose(fIn);
			PRINTF("%s\n", f.c_str());
		}
		fclose(fOut);
	}
	return 0;
}

4. 测试脚本

# -*- coding:utf-8 -*-
import os

fileSize = int(input('Input file size(MB):'))
fileNum  = int(input('Input file number:'))

for n in range(fileNum):        
    filename = str(n) + '.bin'
    f = open('.\\' + filename, 'w')

    for i in range(fileSize):
        for j in range(1024):
            try:
                f.write('01' * 512)
            except KeyboardInterrupt:
                print('\n KeyboardInterrupt')
                f.close()
                exit(-1)
    f.close()

5. 注意事项：

• 文件合并只针对二进制文件，其他文件类型可根据实际情况调整代码；
• 如果文件大小超过2G，合并文件的操作并不使用，还需使用另外的操作)；
• 完整代码请参考文件合并