C++常用程序记录

C++常用程序记录

1.读取文件，替换指定字符串为另一字符串。

稍微改改，就可以变成替换指定字节数组了

朴实无华的操作，只能替换等长的内容

代码：

#include
#include
using namespace std;
int main()
{
	string oldStr = "helloworld";
	string newStr = "xxhhaabbcc";
	
	int length = oldStr.length();
	unsigned char* oldBytes = (unsigned char*)oldStr.c_str();
	unsigned char* newBytes = (unsigned char*)newStr.c_str();
	
	string filename = "";
	cout<<"请输入文件名"<>filename;
	FILE* fp = fopen(filename.c_str(),"rb");
	fseek(fp,0,SEEK_END);
	int len = ftell(fp);
	fseek(fp,0,SEEK_SET);
	unsigned char data[len];
	fread(data,1,len,fp);
	fclose(fp);
	int count = 0;
	for(int i;i>filename;
	fp = fopen(filename.c_str(),"wb");
	fwrite(data,1,len,fp);
	fclose(fp); 
}

后续有用到其他的，再更新吧。