cannot convert from 'unsigned char [3000]' to 'char *'

#include <stdio.h>int main(void) {     int nRead=0;    FILE *fp_in = NULL;FILE *fp_out = NULL;char *ptr=NULL;unsigned char DataBuffer[3000] = {0};ptr=DataBuffer;    fp_in=fopen("video-H264-1","rb");fp_out=fopen("video-out","wb");    do {if((nRead = fread(DataBuffer,sizeof(char),3000,fp_in))!=3000)break;fwrite(ptr,3000,1,fp_out);} while (nRead>0);return 0;}

--------------------Configuration: test - Win32 Debug--------------------
Compiling...
2.cpp
E:\workspace\test\2.cpp(10) : error C2440: '=' : cannot convert from 'unsigned char [3000]' to 'char *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
执行 cl.exe 时出错.

test.exe - 1 error(s), 0 warning(s)

出这样的错误，后来才知道unsigned char数组名不能直接赋给指针，得加上（char *）强制转换