fread 读取mp3文件并网络发送出去

[sms88]

这些代码对txt文件是没有问题的，而要传送mp3文件时却客户端部分pend=strstr(pbegin,"Server:Current\r\n");永远返回NULL，使得无法读取出mp3文件的数据
我觉得是mp3里有些特殊字符的原因

//...客户端代码
		int block=0;
		char temp[100];
		char buffer[1056];
	while (true)
		{
			ZeroMemory(temp,sizeof(temp));
			sprintf(temp,"Range:bytes=%d-%d\r\n",block*900,(block+1)*900);
			ZeroMemory(buffer,sizeof(buffer));
			strcpy(buffer,"Get 金莎-平行线.mp3\r\n");
			strcpy(buffer+strlen(buffer),temp);
			if (send(client,buffer,strlen(buffer),0)==SOCKET_ERROR)
			{
				 printf("send error:%d\r\n",GetLastError());
			};
			Sleep(100);
			ZeroMemory(buffer,sizeof(buffer));
			int recvcount=recv(client,buffer,sizeof(buffer),NULL);
			printf("recvcount=%d\r\n",recvcount);
			char* pbegin=strstr(buffer,"PPVOD:200 OK\r\n");
			if (pbegin!=NULL)
			{
				pbegin+=strlen("PPVOD:200 OK\r\n");
				FILE *file=NULL;
				file=fopen("金莎-平行线.mp3","abr");
			//	fseek(file,0,SEEK_END);
				char *pend=strstr(buffer,"Server:File End\r\n");
				if (pend!=NULL)
				{
					int number=fwrite(pbegin,sizeof(char),pend-pbegin,file);
					printf("number=%d\r\n",number);
					fflush(file);
					fclose(file);
					break;
				}
				pend=NULL;
				pend=strstr(pbegin,"Server:Current\r\n");
				if (pend!=NULL)
				{
					int number=fwrite(pbegin,sizeof(char),pend-pbegin,file);
					printf("number=%d\r\n",number);
					fflush(file);
					fclose(file);
				}
				fclose(file);
			}
			++block;
				
		}

//服务器端部分代码
//Parse the message which comes from client ,and set response message to client
int  ParseMessage(char *szbuffer,char *response)
{//szbuffer为从客户端收到的消息，response准备send给客户端的内容
	int len=0;
	char filename[MAX_PATH];
	ZeroMemory(filename,sizeof(filename));
	char *pbegin=strstr(szbuffer,"Get ");
	pbegin+=strlen("Get ");
	char *pend=strstr(szbuffer,"\r\n");
	strncpy(filename,pbegin,pend-pbegin);
	FILE *file=NULL;
	int startpos=0;
	int endpos=0;
	if ( ( file=fopen(filename,"rb") )==NULL )
	{
		strcpy(response,"PPVOD:204\r\n");//未找到文件
		strcpy(response+strlen(response),"Server:No Find File\r\n");
		len=strlen(response);
		return len;
	}
	else
	{
		pbegin=strstr(szbuffer,"Range:bytes=");
		int result=sscanf(pbegin,"Range:bytes=%d-%d\r\n",&startpos,&endpos);

		if (result!=2 || startpos>=endpos)
		{
			strcpy(response,"PPVOD:205\r\n");//格式错误
			strcpy(response+strlen(response),"Server:Range Error\r\n");
			fclose(file);
			len=strlen(response);
			return len;
		}

		result=fseek(file,startpos,SEEK_SET);
		if (result)
		{
			strcpy(response,"PPVOD:206\r\n");//块头超出文件
			strcpy(response+strlen(response),"Server:Range Error\r\n");
			cout<<response<<endl;
			fclose(file);
			len=strlen(response);
			return len;
		}
		else
		{
			strcpy(response,"PPVOD:200 OK\r\n");
		}
		len=strlen(response);
		int number=fread(response+len,sizeof(char),endpos-startpos,file);
		if (number<endpos-startpos)
		{
			len+=number;
			strcpy(response+len,"Server:File End\r\n");//文件结束
			
			len+=strlen("Server:File End\r\n");
		}
		else
		{
			len+=number;
			strcpy(response+len,"Server:Current\r\n");//
			
			len+=strlen("Server:Current\r\n");
		}
		fclose(file);
		return len;
	}
	
}

[SoftBomb]

pend=strstr(pbegin,"Server:Current\r\n");

很可能是遇到0，提前结束查找了
可以使用strlen(pbegin)来验证看看

[sms88]

内存空间是够的，当number小于900时(既到了文件的尾端了）就会进入
if (number<endpos-startpos)
{
len+=number;
strcpy(response+len,"Server:File End\r\n");//文件结束

len+=strlen("Server:File End\r\n");
}

[zh1369]

mp3 != txt

[sms88]

原来发现mp3文件里有终止符'\0'
搞得strstr走到'\0'就会退出

[sms88]

up

[Supper_Jerry]

pend=strstr(pbegin,"Server:Current\r\n");
这句话本身没有问题的。很可能pbegin里面就没有后面的字符串。

[sms88]

我希望服务器端每次读取900大小的数据

        int number=fread(response+len,sizeof(char),endpos-startpos,file);//这里是没错的number返回900
        if (number<endpos-startpos)
        {
            len+=number;
            strcpy(response+len,"Server:File End\r\n");//文件结束
            
            len+=strlen("Server:File End\r\n");
        }
        else
        {
            len+=number;
            strcpy(response+len,"Server:Current\r\n");//到了这里就是拷贝不进"Server:Current\r\n");若是对文本txt文件操作的话就可以拷贝进去
            
            len+=strlen("Server:Current\r\n");
        }

[sms88]

服务器向客户端发送这样的格式消息:
PPVOD:200 OK\r\n
//900大小的文件数据
Server:Current\r\n 或者Server:File End\r\n

客户端就使用

strstr(pbegin,"Server:Current\r\n");

等类似strstr查找文件数据的起点位置和结束位置。再

fwrite(pbegin,sizeof(char),pend-pbegin,file);

写入硬盘文件

[Supper_Jerry]

//到了这里就是拷贝不进"Server:Current\r\n");
response会不会内存不够了？进入这个else的时候number正确吗？