windows遍历文件,查找文件

遍历文件可以用 _findfirst, _findnext, _findclose

long _findfirst( char *filespec, struct _finddata_t *fileinfo );

返回值: 
如果查找成功的话,将返回一个long型的唯一的查找用的句柄。这个句柄将在_findnext函数中被使用。若失败,则返回-1。 
参数: 
filespec:标明文件的字符串,可支持通配符。 
fileinfo :这里就是用来存放文件信息的结构体的指针。
函数成功后,函数会把找到的文件的信息放入这个结构体中。

int _findnext( long handle, struct _finddata_t *fileinfo );

返回值: 
若成功返回0,否则返回-1。 
参数: 
handle:即由_findfirst函数返回回来的句柄。 
fileinfo:文件信息结构体的指针。

int _findclose( long handle );

返回值:成功返回0,失败返回-1。 
参数: handle :_findfirst函数返回回来的句柄。

用到的结构体 struct _finddata_t 定义如下

struct _finddata64i32_t
{
    unsigned    attrib;           //    文件属性
    __time64_t  time_create;    // -1 for FAT file systems    创建文件时间
    __time64_t  time_access;    // -1 for FAT file systems    最后访问时间
    __time64_t  time_write;     //                            最后修改时间
    _fsize_t    size;            //    文件大小            
    char        name[260];        //    文件名
};

流程就是  通过_findfirst获取一个句柄,然后通过_findnext挨个获取文件,类似单向链表的遍历过程

直接上代码

#include 
#include 
#include 
#include 
#include 
#include 


int file_list(const char *path)
{
	char file[MAX_PATH] = "";
	sprintf_s(file, MAX_PATH, "%s\\*", path);

	long handle;
	struct _finddata_t fileinfo;
	handle = _findfirst(file, &fileinfo);
	if (-1 == handle) {
		return -1;
	}

	if (!(fileinfo.attrib & _A_SUBDIR))
	{
		char file[MAX_PATH] = "";
		sprintf_s(file, MAX_PATH, "%s\\%s", path, fileinfo.name);

		printf("[%s]\n", file);
	}

	while (!_findnext(handle, &fileinfo)) 
	{
        //    去除.和..,如果是文件夹,就递归遍历
		if (strcmp(fileinfo.name, ".") != 0 && strcmp(fileinfo.name, "..") != 0 && (fileinfo.attrib&_A_SUBDIR))
		{
			char dir[MAX_PATH] = "";
			sprintf_s(dir, MAX_PATH, "%s\\%s", path, fileinfo.name);

			file_list(dir);
		}
/*
#define _A_NORMAL 0x00 // Normal file - No read/write restrictions
#define _A_RDONLY 0x01 // Read only file
#define _A_HIDDEN 0x02 // Hidden file
#define _A_SYSTEM 0x04 // System file
#define _A_SUBDIR 0x10 // Subdirectory
#define _A_ARCH   0x20 // Archive file
*/
        //    不是文件夹,就输出文件名
		if (!(fileinfo.attrib & _A_SUBDIR))
		{
			char file[MAX_PATH] = "";
			sprintf_s(file, MAX_PATH, "%s\\%s", path, fileinfo.name);

			printf("[%s]\n", file);
		}
	}
	_findclose(handle);

	return 0;
}

//    获取当前系统的磁盘盘符
char *get_disk_volume()
{
	char *volume = (char *)malloc(sizeof(char) * 26);
	DWORD drive = GetLogicalDrives();

	unsigned int i = 0;
	unsigned int j = 0;

	for (i = 0; i < 26; i++)
	{
		if (drive & (1 << i))
		{
			volume[j++] = i + 'A';
		}
	}
	volume[j] = '\0';

	return volume;
}

//    获取当前系统的磁盘盘符
char *get_disk_volume2()
{
	char *volume = (char *)malloc(26);
	unsigned int i = 0;
	char buff[1024] = "";
	DWORD len = 26 * 4;
	len = GetLogicalDriveStringsA(len, buff);
	for (i = 0; i < len / 4; i++)
	{
		volume[i] = buff[4 * i];
	}
	volume[i] = '\0';

	return volume;
}


int main(int argc, char *argv[]) {
	
	DWORD starttime = GetTickCount();

	char *volume = get_disk_volume();

	for (unsigned int i = 0; i < strlen(volume); i++)
	{
		char drive[3] = "";
		sprintf_s(drive, 3, "%c:", volume[i]);

		file_list(drive);

	}
	free(volume);

	printf("search time=[%f] seconds\n", (GetTickCount() - starttime) / 1000.0f);
	system("pause");

	return 0;
}

最后的结果大概是这样

windows遍历文件,查找文件_第1张图片

系统文件比较多,花了83秒多才遍历完

 

用这一套东西,也可以查找文件,代码也许类似这样

//    查到返回true,查不到返回false

bool find_file(const char *path, const char *filename)
{
	bool bret = false;
	char file[MAX_PATH] = "";
	sprintf_s(file, MAX_PATH, "%s\\*", path);

	long handle;
	struct _finddata_t fileinfo;
	handle = _findfirst(file, &fileinfo);
	if (-1 == handle) {
		return false;
	}

	if (strcmp(fileinfo.name, filename) == 0)
	{
		char name[MAX_PATH] = "";
		sprintf_s(name, MAX_PATH, "%s\\%s", path, fileinfo.name);

		printf("[%s]\n", name);

		bret = true;
	}

	while (!_findnext(handle, &fileinfo)) 
	{
		if (strcmp(fileinfo.name, ".") != 0 && strcmp(fileinfo.name, "..") != 0 && (fileinfo.attrib&_A_SUBDIR))
		{
			char dir[MAX_PATH] = "";
			sprintf_s(dir, MAX_PATH, "%s\\%s", path, fileinfo.name);

            //    这里可以做路径过滤,比如C:\Windows一些系统目录也许就不用查了
			//	C盘只查 C:\\Program Files和 C:\Program Files (x86)
			if (path[0] == 'C' && strncmp(dir, "C:\\Program Files", 16) != 0)
			{
				continue;
			}

			if (find_file(dir, filename))
			{
				bret = true;
			}
		}

		if (strcmp(fileinfo.name, filename) == 0)
		{
			char name[MAX_PATH] = "";
			sprintf_s(name, MAX_PATH, "%s\\%s", path, fileinfo.name);

			printf("[%s]\n", name);

			bret = true;
		}
	}
	_findclose(handle);

	return bret;
}

这样调用,find_file(drive, "iexplore.exe");如果需要查找所有word文档,第二个参数可以传入*.doc

输出结果是这样

windows遍历文件,查找文件_第2张图片

 

你可能感兴趣的:(windows开发)