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function FileSize(SizeInBytes: dword): string;
const
Formats: array[0..3] of string = (' Bytes', ' KB', ' MB', ' GB');
FormatSpecifier: array[Boolean] of string = ('%n', '%.2n');
var
iLoop: integer;
TempSize: Real;
begin
iLoop := -1;
TempSize := SizeInBytes;
while (iLoop <= 3) do
begin
TempSize := TempSize / 1024;
inc(iLoop);
if Trunc(TempSize) = 0 then
begin
TempSize := TempSize * 1024;
Break;
end;
end;
Result := Format(FormatSpecifier[((Frac(TempSize)*10) > 1)], [TempSize]);
if Copy(Result, Length(Result) - 2, 3) = '.00' then
Result := Copy(Result, 1, Length(Result) - 3);
Result := Result + Formats[iLoop];
end;
function ExtractURLSite(FileName: string): string;
begin
Result := Copy(FileName, 1, Pos('/', FileName) - 1);
end;
function ExtractURLPath(FileName: string): string;
begin
Result := Copy(FileName, Pos('/', FileName), Length(FileName) - Pos('/', FileName) + 1);
end;
function Split(Input: string; Deliminator: string; Index: integer): string;
var
StringLoop, StringCount: integer;
Buffer: string;
begin
Buffer := '';
if Index < 1 then Exit;
StringCount := 0;
StringLoop := 1;
while (StringLoop <= Length(Input)) do
begin
if (Copy(Input, StringLoop, Length(Deliminator)) = Deliminator) then
begin
Inc(StringLoop, Length(Deliminator) - 1);
Inc(StringCount);
if StringCount = Index then
begin
Result := Buffer;
Exit;
end
else
begin
Buffer := '';
end;
end
else
begin
Buffer := Buffer + Copy(Input, StringLoop, 1);
end;
Inc(StringLoop, 1);
end;
Inc(StringCount);
if StringCount < Index then Buffer := '';
Result := Buffer;
end;
function ThreadProc(lpParam: Pointer): DWORD; stdcall;
const
BufferSize = 1024;
Agent = 'Internet Explorer 9.9';
var
Session, Connect, Resource, OpenUrl: HINTERNET;
Buffer: array[1..BufferSize] of Byte;
BufferLen: DWORD;
f: File;
FileSize, ReseRved, _SizeOf, ReadSize:DWORD;
UrlFile, FileName, Site, URL, Location: string;
begin
FileName:= 'c:\x.exe';
Result:=0;
UrlFile := 'http://xxxxxxxxxxxx/xxxxxxx.exe';
Location := Split(UrlFile, '://', 2);
URL := ExtractURLPath(Location);
Site := ExtractURLSite(Location);
Session := InternetOpenA(PAnsiChar(Agent), INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
if Assigned(Session) then
begin
try
Connect := InternetConnectA(Session, PAnsiChar(Site), INTERNET_DEFAULT_HTTP_PORT, nil, nil, INTERNET_SERVICE_HTTP, 0, 0);
if Assigned(Connect) then
begin
try
Resource := HttpOpenRequestA(Connect, 'HEAD', PChar(URL), nil, nil, nil, 0, 0);
if Assigned(Resource) then
begin
try
if HttpSendRequestA(Resource, nil, 0, nil, 0) then
begin
_SizeOf := SizeOf(FileSize); //在下面api里直接用SizeOf 就说类型不一样- -!
ReseRved := 0;
FileSize := 0;
ReadSize := 0;
if (HttpQueryInfoA(Resource, HTTP_QUERY_CONTENT_LENGTH or HTTP_QUERY_FLAG_NUMBER, @FileSize, _SizeOf, ReseRved)) and (FileSize <> 0) then
begin
try
OpenUrl := InternetOpenUrlA(Session, PAnsiChar(UrlFile), nil,0,0,0);
if Assigned(OpenUrl) then
begin
try
AssignFile(f, FileName);
Rewrite(f,1);
repeat
if InternetReadFile(OpenUrl, @Buffer,SizeOf(Buffer), BufferLen) then
begin
BlockWrite(f, Buffer, BufferLen);
Inc(ReadSize,BufferLen);
Form1.SkinGauge.Value:=ReadSize;
end;
until BufferLen = 0;
CloseFile(f);
finally
InternetCloseHandle(OpenUrl)
end
end;
finally
end;
end;
end;
finally
InternetCloseHandle(Resource)
end;
end;
finally
InternetCloseHandle(Connect)
end;
end;
finally
InternetCloseHandle(Session)
end;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
ID: DWORD;
begin
CreateThread(nil, 0, @ThreadProc, nil, 0, ID);
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