From my old assembly projects, this is a source code that take an screenshot of your display.
format PE GUI 4.0
include 'INCLUDE\win32w.inc'
struct GdiplusStartupInput
GdiplusVersion dd ?
DebugEventCallback dd ?
SuppressBackgroundThread dd ?
SuppressExternalCodecs dd ?
ends
struct ImageCodecInfo
Clsid db 16 dup ?
FormatID db 16 dup ?
CodecName dd ?
DllName dd ?
FormatDescription dd ?
FilenameExtension dd ?
MimeType dd ?
Flags dd ?
Version dd ?
SigCount dd ?
SizeSize dd ?
SigPattern dd ?
SigMask dd ?
ends
section '.text' code readable executable
entry $
invoke GdiplusStartup,token,input,NULL
test eax,eax
jnz exit
invoke GdipGetImageEncodersSize,encoders_count,encoders_size
test eax,eax
jnz gdiplus_shutdown
invoke VirtualAlloc,0,[encoders_size],MEM_COMMIT,PAGE_READWRITE
test eax,eax
jz gdiplus_shutdown
mov ebx,eax
invoke GdipGetImageEncoders,[encoders_count],[encoders_size],ebx
test eax,eax
jnz gdiplus_shutdown
scan_encoders:
mov esi,[ebx+ImageCodecInfo.MimeType]
mov edi,encoder_mimetype
mov ecx,(encoder_clsid-encoder_mimetype) shr 1
repe cmpsw
je encoder_found
add ebx,sizeof.ImageCodecInfo
dec [encoders_count]
jnz scan_encoders
; no encoder found
jmp gdiplus_shutdown
encoder_found:
lea esi,[ebx+ImageCodecInfo.Clsid]
mov edi,encoder_clsid
mov ecx,4
rep movsd
invoke VirtualFree,ebx,0,MEM_RELEASE
invoke GetDC,HWND_DESKTOP
test eax,eax
jz gdiplus_shutdown
mov esi,eax
invoke GetSystemMetrics,SM_CYSCREEN
mov [screen_height],eax
invoke GetSystemMetrics,SM_CXSCREEN
mov [screen_width],eax
invoke CreateCompatibleBitmap,esi,[screen_width],[screen_height]
test eax,eax
jz release_desktop_dc
mov ebx,eax
invoke CreateCompatibleDC,esi
test eax,eax
jz delete_bitmap
mov edi,eax
invoke SelectObject,edi,ebx
test eax,eax
jz delete_dc
invoke BitBlt,edi,0,0,[screen_width],[screen_height],esi,0,0,SRCCOPY
test eax,eax
jz delete_dc
invoke GdipCreateBitmapFromHBITMAP,ebx,NULL,gdip_bitmap
test eax,eax
jnz delete_dc
invoke GdipSaveImageToFile,[gdip_bitmap],file_name,encoder_clsid,NULL
invoke GdipDisposeImage,[gdip_bitmap]
delete_dc:
invoke DeleteObject,edi
delete_bitmap:
invoke DeleteObject,ebx
release_desktop_dc:
invoke ReleaseDC,HWND_DESKTOP,esi
gdiplus_shutdown:
invoke GdiplusShutdown,[token]
exit:
invoke ExitProcess,0
section '.data' data readable writeable
file_name du 'test.jpg',0
encoder_mimetype du 'image/jpeg',0
.length = $ - encoder_mimetype
encoder_clsid db 16 dup ?
input GdiplusStartupInput 1
token dd ?
memdc dd ?
gdip_bitmap dd ?
encoders_count dd ?
encoders_size dd ?
screen_width dd ?
screen_height dd ?
section '.rdata' data readable
data import
library kernel32,'KERNEL32.DLL',\
user32,'USER32.DLL',\
gdi32,'GDI32.DLL',\
gdiplus, 'GDIPLUS.DLL'
include 'INCLUDE\API\kernel32.inc'
include 'INCLUDE\API\user32.inc'
include 'INCLUDE\API\gdi32.inc'
import gdiplus,\
GdiplusStartup,'GdiplusStartup',\
GdiplusShutdown,'GdiplusShutdown',\
GdipGetImageEncodersSize,'GdipGetImageEncodersSize',\
GdipGetImageEncoders,'GdipGetImageEncoders',\
GdipSaveImageToFile,'GdipSaveImageToFile',\
GdipDisposeImage,'GdipDisposeImage',\
GdipCreateBitmapFromHBITMAP,'GdipCreateBitmapFromHBITMAP'
end data
