Firstly, i want know if the PByte
type is equivalent to a BYTE*
(byte pointer) in C++. In negative case, what's could be on Delphi that more near to BYTE*
of C++?
Well, suppose that i'm right about that PByte
is BYTE*
(C++), then based on following C++ code, how send()
this data type (PByte
) correctly using native WinSock?
See:
C++:
SOCKET sock;
BITMAPINFO bmpInfo;
BYTE *bytes = NULL;
BYTE *temp_bytes = NULL;
DWORD workSpaceSize, fragmntWorkSpaceSize, size;
RtlGetCompressionWorkSpaceSize(COMPRESSION_FORMAT_LZNT1, &workSpaceSize, &fragmntWorkSpaceSize);
bytes = (BYTE *) Alloc(bmpInfo.bmiHeader.biSizeImage);
temp_bytes = (BYTE *) Alloc(bmpInfo.bmiHeader.biSizeImage);
BYTE *memory = (BYTE *) Alloc(workSpaceSize);
RtlCompressBuffer(COMPRESSION_FORMAT_LZNT1,
bytes,
bmpInfo.bmiHeader.biSizeImage,
temp_bytes,
bmpInfo.bmiHeader.biSizeImage,
2048,
&size,
memory);
free(bytes);
free(memory);
if(Send(sock, (char *) temp_bytes, size, 0) <= 0) return;
free(temp_bytes);
Delphi:
var
Sock: TSocket;
bmpInfo: TBitMapInfo;
bytes: PByte = nil;
temp_bytes: PByte = nil;
memory: PByte;
workSpaceSize, fragmntWorkSpaceSize, Size: Cardinal;
//...
RtlGetCompressionWorkSpaceSize(COMPRESSION_FORMAT_LZNT1, @workSpaceSize, @fragmntWorkSpaceSize);
bytes := AllocMem(bmpInfo.bmiHeader.biSizeImage);
temp_bytes := AllocMem(bmpInfo.bmiHeader.biSizeImage);
memory := AllocMem(workSpaceSize);
RtlCompressBuffer(COMPRESSION_FORMAT_LZNT1, bytes, bmpInfo.bmiHeader.biSizeImage,
temp_bytes, bmpInfo.bmiHeader.biSizeImage, 2048, @Size, memory);
FreeMem(bytes);
FreeMem(memory);
if send(Sock, temp_bytes^, Size, 0) <= 0 then Exit;
FreeMem(temp_bytes);
- Reference to
RtlGetCompressionWorkSpaceSize()
andRtlCompressBuffer()
functions in C++. - Reference to
RtlGetCompressionWorkSpaceSize()
andRtlCompressBuffer()
functions in Delphi.