一个恢复BMP图片的程序代码，求大神解释下！

Question

#include "windows.h"
#include "stdio.h"
int main(int argc, char* argv[])
{
struct BMPHEADER{
WORD ND;
WORD TYPE;
int size;
WORD r1;
WORD r2;
}bh;
HANDLE f,fout;
DWORD Num;
int filesize;
char fname[20];
LPCTSTR lpstrtmp = "C:" ; 打开磁盘C,创建句柄
char str[MAX_PATH] = "\\\\.\\";
strcat(str, lpstrtmp);
f=::CreateFile(str,GENERIC_READ,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
if(f==INVALID_HANDLE_VALUE){return 0;}
filesize=::GetFileSize(f,NULL); 这里是得到磁盘的大小？还是获取BMP文件的大小
for (int i=0;i<filesize;i+=512)
{
::SetFilePointer(f,i,NULL,FILE_BEGIN);
::ReadFile(f,&(bh.TYPE),10,&Num,NULL);
if(bh.TYPE==MAKEWORD('B','M')&&bh.r1==0&&bh.r2==0)
{
::SetFilePointer(f,i,NULL,FILE_BEGIN);
char *dout=new char[bh.size];
::ReadFile(f,dout,bh.size,&Num,NULL);
sprintf(fname,"%d.bmp",i);这里屏幕没有显示？
fout=::CreateFile(fname,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
::WriteFile(fout,dout,bh.size,&Num,NULL);
delete [] dout;
CloseHandle(fout);
i=((i+bh.size)/512)*512;
}
}
CloseHandle(f);
return 0;
}

Answer 1

class WildMatch {
public:
bool chkWildMatch(string A, int lena, string B, int lenb) {
const char * p1 = A.c_str();
const char * p2 = B.c_str();
return match(p2, p1);

}

int matchstar(int c,const char *regexp,const char *text) {// matchstar: search for c*regexp at beginning of text
do {// a * matches zero or more instances
if (matchhere(regexp, text)) return 1;
} while (*text != '\0' && (*text++ == c || c == '.'));
return 0;
}
int matchhere( const char *regexp, const char *text) {// matchhere: search for regexp at beginning of text
if (regexp[0] == '\0') return 1;
if (regexp[1] == '*') return matchstar(regexp[0], regexp + 2, text);
if (regexp[0] == '$' && regexp[1] == '\0') return *text == '\0';
if (*text != '\0' && (regexp[0] == '.' || regexp[0] == *text)) return matchhere(regexp + 1, text + 1);
return 0;
}

int match(const char *regexp,const char *text) {// match: search for regexp anywhere in text
if (regexp[0] == '^') return matchhere(regexp + 1, text);
do {// must look even if string is empty
if (matchhere(regexp, text)) return 1;
} while (*text++ != '\0');
return 0;
}
};

追问

高手你好厉害啊，完全看不懂代码！您可以给我点提示吗？
或者给您的代码加点注释！