C/C++ 文件读写操作

 

标准C++ 读写文件内容：

//标准C++ 读文件内容  ( 仿PHP ) 2012-8-12 by Dewei
//用法：string s = file_get_contents("C:\\LICENSE.txt"); 
string file_get_contents(const string &filename)  
{  
	string contents = "";
	fstream in;
	in.open(filename.c_str(), fstream::in|fstream::binary|fstream::ate);
	if (in.good()) {  
		fstream::pos_type end_pos = in.tellg();
		long num_size = end_pos; 
		++num_size;
		in.seekg (0, fstream::beg);  
		char *buffer = new char[num_size];
		memset(buffer, 0, num_size);
		in.read(buffer, end_pos);  
		in.close();  
		contents = buffer;
		if (buffer != NULL)
			delete[] buffer;
	}
	return contents;  
}  

//标准C++ 写入文件内容 ( 仿PHP )  2012-8-12 by Dewei
//用法：file_put_contents("C:\\LICENSE.txt", "写入内容");
bool file_put_contents(const string &filename, const string contents)
{
	fstream out;
	out.open(filename.c_str(), fstream::out|fstream::binary);
	if (out.good()) {
		out.write(contents.c_str(), contents.length());
		out.close();
	}
	return true;
}

 

 

C 语言实现 读写文件内容：

 

//C 语言实现 读取文件内容 ( 仿PHP ) 2012-6-25 by Dewei
//用法：string s = file_get_contents("C:\\LICENSE.txt");
string file_get_contents(const string &filename)  
{  
	string contents;  
	FILE *fp;  
	fp = fopen(filename.c_str() , "rb");  
	if (fp == NULL) {  
		return "";  
	}  
	fseek(fp, 0, SEEK_END);  

	int file_size = ftell(fp);  

	char *tmp;  
	fseek(fp, 0, SEEK_SET);  
	tmp =  (char *)malloc(file_size+1);  
	memset(tmp, 0, file_size+1);  
	fread(tmp, sizeof(char), file_size, fp);  
	if (ferror(fp)) {  
		/* now, it is an error on fp */   
	}  
	fclose(fp);  
	contents = tmp;  
	free(tmp);  
	return contents;  
}  

//C 语言实现 写入文件内容 ( 仿PHP ) 2012-6-25 by Dewei
//用法：file_put_contents("C:\\LICENSE.txt", "写入内容");
bool file_put_contents(const string &filename, const string contents)
{
	FILE *fp;
	fp = fopen(filename.c_str() , "wb");
	if (fp == NULL) {
		return false;
	}
	fwrite(contents.c_str(), contents.length(), 1, fp);
	fclose(fp);
	return true;
}