我有做过,是抄别人的,给你看看
VAR
filename:string;
//这里是从系统中取得一个临时文件
function gettemporyfilename:string;
const max_path=144;
var
lppathbuffer
char;
lpbuffer
char;
begin
getmem(lpbuffer,max_path);
getmem(lppathbuffer,max_path);
gettemppath(max_path,lppathbuffer);
gettempfilename(lppathbuffer,'tem',0,lpbuffer);
freemem(lppathbuffer,max_path);
gettempfilename(gettempdrive('c'),'tem',0,lpbuffer);
result:=strpas(lpbuffer);
freemem(lpbuffer,max_path);
end;
//将一个AVI文件写到blob字段中去
procedure tform1,button1click(sender:tobject);
var
filestream:tfilesteam;//to load the avi file
blobstream:tblobstream;//to save to the bolb
begin
application.processmessages;
button1.enabled:=false;
button2.enabled:=false;
filestream:tfilestream.create('ppath',fmopenread);//ppath是这个avi的路径
table1.edit;
//为table1avi字段创建一个blobstream
blobstream:=tblobstream.create(table1avi,bmreadwrite);
//移动到stream的首位
blobstream.seek(0,sofrombeginning);
//清空流数据
blobstream.truncate;
//将filestream的内容拷贝到blobstream
blobstream.copyfrom(filestream,filestream.size);
//释放流
filestream.free;
blobstream.free;
//添加记录
table1.post;
//使buttons可用
button1.enabled:=true;
button2.enabled:=true;
end;
procedure tform1.button2click(sender:tobject);
var
filestream:tfilestream;//a temp file
bolobstream:tblobstream;//the AVI blob
begin
//为AVI字段创建BLOB数据流
bolobstream:=tblobstream.create(table1avi,bmread);
if blobstream.size=0 then
begin
blobstream.free;
exit;
end;
//关闭media player
mediaplayer1.close;
//重值文件名
mediaplayer1.filename:='';
//刷新显示窗口
mediaplayer1.display:=panel1;
panel1.refresh;
//创建前删除同名的临时文件
if filename<>'' then
deletefile(filename);
//设置临时文件名
filename:=gettemporaryfilename;
//为临时文件创建文件流
filestream:=tfilestream.create(filename,fmcreate or fmopenwrite);
//拷贝blob到临时文件中
filestream.copyfrom(blobstream,blobstream.size);
//释放流
filestream.free;
blobstream.free;
//设置media player播放AVI文件
mediaplayer1.filename:=filename;
mediaplayer1.devicetype:=dtavivideo;
mediaplayer1.open;
mediaplayer1.play;
end;
procedure tform1.formdestroy(sender:tobject);
begin
//取消临时文件和media player的关联
mediaplayer1.close;
mediaplayer1.filename:='';
//删除临时文件
if filename<>'' then
deletefile(filename);
end;