在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
Qh4@Nl#Ncf
*]<M%q!<6 一、实现方法
DnbT<oEL [If%+mHdU 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
-;5WMX6 AE1EZ# #pragma data_seg("shareddata")
cG)i: HHOOK hHook =NULL; //钩子句柄
I9xQ1WJc` UINT nHookCount =0; //挂接的程序数目
K-%x]Fp= static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Ns ?8N": static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
(;RmfE'PX static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
\-XQo static int KeyCount =0;
)%8 ;C]G; static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
c{YBCWA #pragma data_seg()
Up:<NHJT 2Zf}t 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
G}!dm0s$ 8y9oj9
;E] DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
4x.1J c&!EsMsU BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
J$'Q3k cKey,UCHAR cMask)
<m;idfn {
4bV&U= BOOL bAdded=FALSE;
tOn 6 for(int index=0;index<MAX_KEY;index++){
(/x%zmY;/U if(hCallWnd[index]==0){
nE$8-*BZ_ hCallWnd[index]=hWnd;
#\15,!*a= HotKey[index]=cKey;
TqzL] 'NS+ HotKeyMask[index]=cMask;
}$6;g-|HX bAdded=TRUE;
-4
~(* KeyCount++;
TvV_Tz4e break;
gXrPZ|iS }
r_m*$r~f }
x+? P/Ckg return bAdded;
Mf7Z5 }
$
{Y?jJ //删除热键
&NvvaqJ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
dMo456L {
A .]o&S} BOOL bRemoved=FALSE;
CC?L~/gPN for(int index=0;index<MAX_KEY;index++){
{s ]yP_ if(hCallWnd[index]==hWnd){
${(c`X if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
k!9LJ%Xh hCallWnd[index]=NULL;
}n!$)W*? HotKey[index]=0;
+M@,CbqD HotKeyMask[index]=0;
H0!W:cIS;l bRemoved=TRUE;
]yc&ffe% KeyCount--;
|=R@nn
break;
teRK#: .P }
Ancka }
u"WqI[IV }
2n/cqK return bRemoved;
3aD\J_ }
]+C;C XTzz/.T;Z /z'fFl^6O DLL中的钩子函数如下:
*@2+$fgz ,hMdxZJd LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
9j[lr${A {
a]JQZo1$ BOOL bProcessed=FALSE;
lCyBdY9n if(HC_ACTION==nCode)
hUL5V1-j {
R^[b
I; if((lParam&0xc0000000)==0xc0000000){// 有键松开
@-^jbmu^
P switch(wParam)
-SyQ`V)T7N {
$ mH'%YDIl case VK_MENU:
E5>y?N MaskBits&=~ALTBIT;
],!7S"{97 break;
6p=OM=R case VK_CONTROL:
9 E@}@ZV( MaskBits&=~CTRLBIT;
Xs,[Z2_iq break;
{*#}"/:8K case VK_SHIFT:
)GbVgYkk MaskBits&=~SHIFTBIT;
AeQIsrAHE break;
A>0wqT default: //judge the key and send message
$w:7$:k break;
@ V_@r@A }
;v}f7v ' for(int index=0;index<MAX_KEY;index++){
G<dWh.|`= if(hCallWnd[index]==NULL)
z8MKGM continue;
}&E'ox<S if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]]R!MnU:$ {
P~6QRm SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
(x+C=1, bProcessed=TRUE;
h;s~I/e( }
aPELAU- }
ceKR?%8 s }
~~8?|@V else if((lParam&0xc000ffff)==1){ //有键按下
p3e_:5k switch(wParam)
be@\5
{
\J)ffEKIp case VK_MENU:
)MV`(/BC* MaskBits|=ALTBIT;
0 It[Pa qG break;
cx+li4v case VK_CONTROL:
XIS.0]~ MaskBits|=CTRLBIT;
'4T]=s~N break;
,_G((oS40 case VK_SHIFT:
QTy xx MaskBits|=SHIFTBIT;
f@G3,u!]i break;
<'Ppu default: //judge the key and send message
z_gjC%(y break;
Zze(Ik }
e9F\U
for(int index=0;index<MAX_KEY;index++){
a>_Cxsb&` if(hCallWnd[index]==NULL)
|I0O|Zdv continue;
q? 9x0L if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
RV%aFI ) {
Ao2m"ym SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
49e~/YY bProcessed=TRUE;
equ|v~@y }
r[u@[ }
(toN??r }
@,=E[c
8 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
7KB:wsz^ for(int index=0;index<MAX_KEY;index++){
-5&|"YYjr{ if(hCallWnd[index]==NULL)
{9/ayG[98 continue;
U\<8}+x if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
&EZq%Sd SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
W7sx/O9 //lParam的意义可看MSDN中WM_KEYDOWN部分
+"~~;J$ }
}3}{} w0Y }
\!]Zq#*kH }
4R;6u[a]u return CallNextHookEx( hHook, nCode, wParam, lParam );
``Yw-|&:Ae }
]>:LHW Q5!"tF p 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
qGH
s2Og ,(D:cRN BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
=P,h5J BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
XBTtfl
& {H\(H_X 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
gG>|5R0 hwon^? LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Msk^H7 {
|=xK-;qs if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
g_T[m* {
tB,1+I= //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
t%B ,ATW SaveBmp();
yv2&K=rZp return FALSE;
=9LeFrz }
Ah|,`0dw …… //其它处理及默认处理
8/tvS8I#y }
zG[GyyAQ vv9=g*"j =Nc}XFq 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
G#|`Bjv"aP L#\!0YW/@ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
0-N"_1k|? b }^ylm 二、编程步骤
*8a8Ng ne~=^IRB 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
B\tP{}P8{ xDJs0P4 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
SF7p/gG @Yl&Jg2l' 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
:X66[V&eH RCgn\ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
R cz;|h8 Cq<a|t 5、 添加代码,编译运行程序。
a$7}41F[~s 9"#,X36 三、程序代码
o'`:$
( ipIexv1/S ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
8}Qmhm`_j= #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
IpRdGT02 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
]P5|V4FXo #if _MSC_VER > 1000
NDmTxW#g #pragma once
t/3t69 \x #endif // _MSC_VER > 1000
YpGG^;M$ #ifndef __AFXWIN_H__
tbNIl cAWS #error include 'stdafx.h' before including this file for PCH
3~r>G #endif
NJe^5>4` #include "resource.h" // main symbols
G(;C~kHX class CHookApp : public CWinApp
h VQj$TA {
\?|FB~.Ry public:
sXpA^pT"T CHookApp();
65~X!90k // Overrides
$v6`5;#u // ClassWizard generated virtual function overrides
X=W.{? //{{AFX_VIRTUAL(CHookApp)
#cZ<[K q6 public:
[5iBXOmpS= virtual BOOL InitInstance();
;mi+[`E virtual int ExitInstance();
2brxV'tk //}}AFX_VIRTUAL
|#)S`Ua1 //{{AFX_MSG(CHookApp)
{FrcpcrQa // NOTE - the ClassWizard will add and remove member functions here.
DO^K8~] // DO NOT EDIT what you see in these blocks of generated code !
$?e_l
//}}AFX_MSG
E &wz0d;gf DECLARE_MESSAGE_MAP()
JF+E.-fy$ };
y\xa<!:g LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
^e1Ux BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
w<0F-0:8 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Avc9W[4 BOOL InitHotkey();
\'BA}v
&/ BOOL UnInit();
"SV#e4C. #endif
zFq8xw Hl3%+f //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
B9&$sTAB #include "stdafx.h"
q0>@!1Wb #include "hook.h"
P>i!f!o*I #include <windowsx.h>
%#zqZ|q #ifdef _DEBUG
D=0^"7K #define new DEBUG_NEW
m"r=p #undef THIS_FILE
?_ V oO static char THIS_FILE[] = __FILE__;
4$wn8!x2| #endif
^`MGlI} #define MAX_KEY 100
f\{ynC2m #define CTRLBIT 0x04
-%g$~MZ?' #define ALTBIT 0x02
5g$]ou #define SHIFTBIT 0x01
}%@q; "9` #pragma data_seg("shareddata")
8}^R jMgI HHOOK hHook =NULL;
d
hp-XIA; UINT nHookCount =0;
9S y |:J0 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
h3<L,Olp static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
-!C9x?gNY static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
n'42CE static int KeyCount =0;
5N_w(B static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
zD9gE #pragma data_seg()
$r'PYGn HINSTANCE hins;
<uYeev% void VerifyWindow();
8vK$]e36 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
3Aqw)B'"_ //{{AFX_MSG_MAP(CHookApp)
^qro0]"LD // NOTE - the ClassWizard will add and remove mapping macros here.
L2j7w006 // DO NOT EDIT what you see in these blocks of generated code!
G%RL8HU //}}AFX_MSG_MAP
,8Yc@P_O END_MESSAGE_MAP()
3om_Z/k +'@j~\>^yJ CHookApp::CHookApp()
nc.(bb), {
2j UEL=+Y // TODO: add construction code here,
FD+y?UF // Place all significant initialization in InitInstance
\?VNr2 }
.:nV^+) C~r(*nr CHookApp theApp;
NhgzU+)+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
TGxmc37? {
)yj:P BOOL bProcessed=FALSE;
fGz++;b<S if(HC_ACTION==nCode)
xX5EhVR {
)v+R+3< if((lParam&0xc0000000)==0xc0000000){// Key up
_?YP0GpU switch(wParam)
#3h~Z)+y {
I=DvP;! case VK_MENU:
3`mM0,fY MaskBits&=~ALTBIT;
G""L1? break;
BS@x&DB case VK_CONTROL:
vK10p)ZV MaskBits&=~CTRLBIT;
]DO~7p[ break;
e-`=?tct case VK_SHIFT:
m,"N4a@ MaskBits&=~SHIFTBIT;
@N% /v* break;
dh~ cj5 default: //judge the key and send message
;GjZvo break;
L#}HeOEi[ }
8=Z]?D= for(int index=0;index<MAX_KEY;index++){
6M/*]jLq4 if(hCallWnd[index]==NULL)
UgBD|~zu continue;
@_L:W1[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
q"uP%TN {
v[*&@aW0n SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
g:yUZ;U bProcessed=TRUE;
2l YA% n }
U^@8ebv }
^G*zFqa+` }
9td[^EB#(h else if((lParam&0xc000ffff)==1){ //Key down
#@v$`Df< switch(wParam)
GcpAj9 {
5J1q]^ case VK_MENU:
!idQ-& MaskBits|=ALTBIT;
(3[Lz+W.u break;
\(.])I>)eh case VK_CONTROL:
@8jc|X<A MaskBits|=CTRLBIT;
IcDAl~uG break;
="<S1}. case VK_SHIFT:
$X;wj5oj MaskBits|=SHIFTBIT;
&|%F=/VU break;
j0eGg:: default: //judge the key and send message
rRK^vfoJ` break;
v6$ }saTX }
OfAh?^R for(int index=0;index<MAX_KEY;index++)
d ~`_;.z {
rF*L@HI if(hCallWnd[index]==NULL)
D|lm, continue;
|rhCQ"H if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
)=:gO`"D {
@ a$HJ: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
TSp;VrOP bProcessed=TRUE;
bTrQ(qp }
-2\%?A6L }
KkF3E*q\H }
\dG#hH4ZD if(!bProcessed){
M.loG4r! for(int index=0;index<MAX_KEY;index++){
V.f'Cw if(hCallWnd[index]==NULL)
}Efz+>F02 continue;
G9_M~N%a if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
&E{i#r)'T SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
>.fN@8[ }
>@T(^=Q }
uQYBq)p| }
xwm-)~L4T return CallNextHookEx( hHook, nCode, wParam, lParam );
QSNLo_z }
YdT-E ndY1j5 BOOL InitHotkey()
*a2y {
82q_"y>6 if(hHook!=NULL){
F[65)"^ nHookCount++;
FV1!IE-}- return TRUE;
[HV9KAoA }
q7VpKfA:M else
Du*O| hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
EXrOP]Kl if(hHook!=NULL)
AVx 0aj nHookCount++;
(ru9Ke%Dx return (hHook!=NULL);
?Ww\D8yV& }
5ZPe=SQ{ BOOL UnInit()
;44?`[oP {
,Z"l3~0\ if(nHookCount>1){
7LB#\2 nHookCount--;
}"{NW!RfP return TRUE;
UhX`BGpM{ }
ti)4J2c,8 BOOL unhooked = UnhookWindowsHookEx(hHook);
bN',-[E if(unhooked==TRUE){
.).*6{_ nHookCount=0;
!N::1c@C hHook=NULL;
3XeCaq'N }
%~ ROV>& return unhooked;
ST^@7f_ }
d:x=g i! }&o*ZY-1 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
"E><:_,\ {
t\p_QWnF BOOL bAdded=FALSE;
ua'dm6",: for(int index=0;index<MAX_KEY;index++){
dE_I=v if(hCallWnd[index]==0){
DJF-J# hCallWnd[index]=hWnd;
6J\Yi)v< HotKey[index]=cKey;
>;ucwLi HotKeyMask[index]=cMask;
c20'{kH bAdded=TRUE;
?b&~(,A{ KeyCount++;
,uFdhA(i@' break;
E7*z.3 }
_*.Wo"[%[X }
hgz7dF return bAdded;
:h|nV
~ }
>#MGGCGL Ef}rMkv BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
rdL>yT/A {
cX64 X BOOL bRemoved=FALSE;
Ux2pqPb for(int index=0;index<MAX_KEY;index++){
gda3{g7<) if(hCallWnd[index]==hWnd){
lIN`1vX( if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
(aO+7ykRuJ hCallWnd[index]=NULL;
.-:R mYGR HotKey[index]=0;
`GG PkTN HotKeyMask[index]=0;
nsq7,%5 bRemoved=TRUE;
y?|JBf KeyCount--;
D/jS4'$vA break;
@'K+ }
e:BKdZGW }
6^L4wd7) }
L;},1
\ return bRemoved;
);$L#XpB }
*(~=L%s uQ;b'6Jcp void VerifyWindow()
<3!jra,h {
)32BM+f"77 for(int i=0;i<MAX_KEY;i++){
iG[an*#X if(hCallWnd
!=NULL){ JvHGu&Nr!
if(!IsWindow(hCallWnd)){ y`~[R7E
hCallWnd=NULL; @Y#{[@Hp%
HotKey=0; ypuW}H%`
HotKeyMask=0; $=j}JX}z
KeyCount--; A@@Z?t.
} | Wrf|%p
} !/w<F{cl
} S*o%#ZJN
} p& > z=Z*
ak?XE4-N
BOOL CHookApp::InitInstance() /lQGFLZL
{ ~PT(/L
AFX_MANAGE_STATE(AfxGetStaticModuleState()); crJyk #_
hins=AfxGetInstanceHandle(); OG_2k3v
InitHotkey(); zl:
5_u=T
return CWinApp::InitInstance(); W*hRYgaX3
} c%uX+\-$
`]^JOw5o
int CHookApp::ExitInstance() eeuTf
{ %#rH~E
VerifyWindow(); 3N) bJ
UnInit(); 3B(6^iS
return CWinApp::ExitInstance(); Og`6>?>97
} zL@ZNH
pZ/aZg1Ld
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file S-"OfWg<
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +_8*;k@F'
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ bP`.teO\
#if _MSC_VER > 1000 mis
cmD
#pragma once /\-qz$
#endif // _MSC_VER > 1000 -Fodqq@,
_u^ S[
class CCaptureDlg : public CDialog 05zBB
{ i;1aobG
// Construction
R1YRqk
public: \e5bxc
BOOL bTray; `0tzQ>ZQq
BOOL bRegistered; TR8<=
BOOL RegisterHotkey(); {XMF26C#
UCHAR cKey; /++CwRz@Gm
UCHAR cMask; @)>9l&
void DeleteIcon(); m<>3GF,5bP
void AddIcon(); 2$^n@<uZ@
UINT nCount; s%nx8"
void SaveBmp(); 8_MR7'C1hi
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~+{OSx<S
// Dialog Data 7m6@]S6
//{{AFX_DATA(CCaptureDlg) 'AX/?Srd
enum { IDD = IDD_CAPTURE_DIALOG }; +$:bzo_u
CComboBox m_Key; CT@JNG$<"
BOOL m_bControl; .kSx>3
BOOL m_bAlt; 6@-VLO))O
BOOL m_bShift; Kr!(<i
CString m_Path; 0x Vue[ep
CString m_Number; s[|sfqB1`
//}}AFX_DATA vMsb@@O\ \
// ClassWizard generated virtual function overrides \gRX:i#n
//{{AFX_VIRTUAL(CCaptureDlg) (
w(GJ/g
public: 3T$gT
virtual BOOL PreTranslateMessage(MSG* pMsg); i0ax`37
protected: p4;A[2Ot`:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W8Z&J18AU
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9 veq
//}}AFX_VIRTUAL 7hq*+e
// Implementation 66x>*
protected: +A 6xY
HICON m_hIcon; hPhNDmL#3
// Generated message map functions `MAluu+b
//{{AFX_MSG(CCaptureDlg) >-YPCW
virtual BOOL OnInitDialog(); CwQgA%)!i
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); d]0.6T1[K
afx_msg void OnPaint(); )6#dxb9
afx_msg HCURSOR OnQueryDragIcon(); e%w>QN`
virtual void OnCancel(); ~ y%8uHL:
afx_msg void OnAbout(); <N11$t&_
afx_msg void OnBrowse(); "q(#,,_
afx_msg void OnChange(); klduJT
>
//}}AFX_MSG ID"'`DKxe
DECLARE_MESSAGE_MAP() wSHE~Xx
}; )A9K9pZj
#endif D.H$4[u;j
UH1AT#?!W
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file @~0kSA7
#include "stdafx.h" 9"g=it2Rh6
#include "Capture.h"
,vEwck#
#include "CaptureDlg.h" .7TQae%
#include <windowsx.h> > $0eRVL
#pragma comment(lib,"hook.lib") "ZDc$v:Qa
#ifdef _DEBUG N.OC _H&
#define new DEBUG_NEW o0b}:`
#undef THIS_FILE /238pg~Cw5
static char THIS_FILE[] = __FILE__;
RKsr}-18
#endif ?y82S*sb#
#define IDM_SHELL WM_USER+1 PDaHY
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); eOa:%{Kj
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l/,O9ur-
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; U`_(Lq%5W
class CAboutDlg : public CDialog ,.tv#j|A
{ YB/A0 J
public: ooY2"\o
CAboutDlg(); Tx%6whd/'
// Dialog Data &K5wCNX1
//{{AFX_DATA(CAboutDlg) 1\:puC\)
enum { IDD = IDD_ABOUTBOX }; R{.5Z/Vp6E
//}}AFX_DATA Fx2z lM&
// ClassWizard generated virtual function overrides >VnkgY
//{{AFX_VIRTUAL(CAboutDlg) _Z'j%/-4@D
protected: })O^xF~
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W!pLk/|ls
//}}AFX_VIRTUAL <Y9vc:S
// Implementation 0UeDM*
protected: SovK|b&
//{{AFX_MSG(CAboutDlg) YRF%].A%2
//}}AFX_MSG '+1<7jl&I
DECLARE_MESSAGE_MAP() s0"S;{_#
}; r+fR^hv
=D.M}xqo
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :nYl]Rm
{ #W,BUN}
//{{AFX_DATA_INIT(CAboutDlg) ^& ZlV
//}}AFX_DATA_INIT ab8uY.j
} *[jG^w0z8~
VyH'7_aU
void CAboutDlg::DoDataExchange(CDataExchange* pDX) y6ntGrZ}$
{ ^OKCvdS
CDialog::DoDataExchange(pDX); Ql sMMIax
//{{AFX_DATA_MAP(CAboutDlg) xg %EQ
//}}AFX_DATA_MAP M7BCBA
} XYIZ^_My
[8AGW7_
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |i'V\"
hW
//{{AFX_MSG_MAP(CAboutDlg) ''S*B|:
// No message handlers 4`5 jq)
//}}AFX_MSG_MAP Jr
m<ut
END_MESSAGE_MAP() AVyO5>w
vR<Y1<j
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) I`kaAOe
: CDialog(CCaptureDlg::IDD, pParent) BsiHVr
{ Xk%92Pto
//{{AFX_DATA_INIT(CCaptureDlg) VH7VJ [
m_bControl = FALSE; #y13(u,dN
m_bAlt = FALSE; iLw O4i
m_bShift = FALSE; $6w[h7
m_Path = _T("c:\\"); !qPVC\l
m_Number = _T("0 picture captured."); YlDui8.N
nCount=0; /gT$ d2{
bRegistered=FALSE; 44 ,:@
bTray=FALSE; mw)KyU#l,:
//}}AFX_DATA_INIT s@sRdoTdF
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !K^.r_0H.
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); IBWUXG;
} s 7re
K.c6n,'
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 8<ZxE(v
{ q
y73
CDialog::DoDataExchange(pDX); 57IAH$n8o
//{{AFX_DATA_MAP(CCaptureDlg) ^c3~CD5H
3
DDX_Control(pDX, IDC_KEY, m_Key); 6KPM4#61o
DDX_Check(pDX, IDC_CONTROL, m_bControl); :5hKE(3Q
DDX_Check(pDX, IDC_ALT, m_bAlt);
'&,$"QXwE
DDX_Check(pDX, IDC_SHIFT, m_bShift); eeb`Ao
DDX_Text(pDX, IDC_PATH, m_Path); ,R/HT@
DDX_Text(pDX, IDC_NUMBER, m_Number); r4/G&m[V
//}}AFX_DATA_MAP p
x1y#Q
} 0FmYM@Wc
3Z#k9c_b
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) WGFp<R
//{{AFX_MSG_MAP(CCaptureDlg) {pMbkAQ@
ON_WM_SYSCOMMAND() hI*gw3V
ON_WM_PAINT() j|"#S4IX)F
ON_WM_QUERYDRAGICON() |Fz/9+I
ON_BN_CLICKED(ID_ABOUT, OnAbout) fH?e9E4l
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 5BnO-[3
ON_BN_CLICKED(ID_CHANGE, OnChange) (@*[^@ipV
//}}AFX_MSG_MAP >2l1t}"\
END_MESSAGE_MAP()
5Z/x Y&
c'n EbelE
BOOL CCaptureDlg::OnInitDialog() /tI8JXcUK
{ O@r%G0Jge
CDialog::OnInitDialog(); UN#XP$utY
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); .g71?^?(
ASSERT(IDM_ABOUTBOX < 0xF000); lPyGL-Q
CMenu* pSysMenu = GetSystemMenu(FALSE); .&dW?HS
if (pSysMenu != NULL) oLK-~[p
{ f tW-
CString strAboutMenu; )8]O|Z-CU
strAboutMenu.LoadString(IDS_ABOUTBOX); ]vRte!QJ;
if (!strAboutMenu.IsEmpty()) rC.z772y%
{ {/`iZzPg
pSysMenu->AppendMenu(MF_SEPARATOR); I$!rNfrs
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `>&V_^y+
} a;JB8
} (A(7?eq
SetIcon(m_hIcon, TRUE); // Set big icon !_CBf#0
SetIcon(m_hIcon, FALSE); // Set small icon 3Ob"R%Yo
m_Key.SetCurSel(0); vI3L <[W
RegisterHotkey(); i"mN0%
CMenu* pMenu=GetSystemMenu(FALSE); i[1K~yXq:
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); a^_\ #,}
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); %suSZw`
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6L[ Yn?;
return TRUE; // return TRUE unless you set the focus to a control UFBggT\
} SV#$Cf g
734)s
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) d_s=5+Yj
{ X!Ag7^E
if ((nID & 0xFFF0) == IDM_ABOUTBOX) P{j2'gg3
{ g&eIfm
CAboutDlg dlgAbout; ~t7?5b?*\
dlgAbout.DoModal(); `|?K4<5|
} )90 Q
else C3q}Dh+]
{ Qgx9JJ>
CDialog::OnSysCommand(nID, lParam); 9IJBK
} R6l`IlG`
} A;ip
V :)
5(RFkZn4[
void CCaptureDlg::OnPaint() jMv qKJ(<
{ -|;{/ s5
if (IsIconic()) -xs@rV`
{ q5C(/@)^
CPaintDC dc(this); // device context for painting <QbD ; (%
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Kn-cwz5
// Center icon in client rectangle "ee:Z_Sz
int cxIcon = GetSystemMetrics(SM_CXICON); ybLl[K(D=
int cyIcon = GetSystemMetrics(SM_CYICON); 2F*spu
CRect rect; 278:5yC
GetClientRect(&rect); 3cfJ(%'X
int x = (rect.Width() - cxIcon + 1) / 2; 4/UY*Us&
int y = (rect.Height() - cyIcon + 1) / 2; Wno{&I63
// Draw the icon (;DnL|"'8
dc.DrawIcon(x, y, m_hIcon); lId}sf
} }ie O
else `{w.OK
{ #1fT\aP
CDialog::OnPaint(); j}9][Fm1*
} {l$DNnS
} /)RyRS8c
ILi{5L
HCURSOR CCaptureDlg::OnQueryDragIcon() FW* k O
{ =rSJ6'2("
return (HCURSOR) m_hIcon; SFhi]48&V
} |@'/F #T
5cj]Y)I-~
void CCaptureDlg::OnCancel() }AfX0[!O
{ qw^kA?
if(bTray) cGF_|1`
DeleteIcon(); 7#/->Y
CDialog::OnCancel(); a#3+PB#
} Ws;S=|9,7~
(gW#T\Eln
void CCaptureDlg::OnAbout() wW2b?b{*Z
{ "&h{+DHS
CAboutDlg dlg; co!o+jP
dlg.DoModal(); l0Rjq*5hJ
} aumWU{j=
}%e"A4v
void CCaptureDlg::OnBrowse() \S#Mc
{ &1nZ%J9
CString str; z+3GzDLy
BROWSEINFO bi; HURrk~[
char name[MAX_PATH]; iCd$gwA>F
ZeroMemory(&bi,sizeof(BROWSEINFO)); ^a+W!
bi.hwndOwner=GetSafeHwnd(); MnToL@
bi.pszDisplayName=name; F)fCj^zL
bi.lpszTitle="Select folder"; K4w %XVaH
bi.ulFlags=BIF_RETURNONLYFSDIRS; FPAy.cljJ
LPITEMIDLIST idl=SHBrowseForFolder(&bi); `FS)i7-o6
if(idl==NULL) ?\Fo|__
return; yFt$L'#
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >O0z+tj
str.ReleaseBuffer(); N
RB>X
m_Path=str; T''PzY!Qf
if(str.GetAt(str.GetLength()-1)!='\\') wXUP%i]i=
m_Path+="\\"; O*qSc^ 9q
UpdateData(FALSE); Ml-GAkgG
} +]?/c>M
\iN3/J4
void CCaptureDlg::SaveBmp() Buxn!s
{ ?a)X)#lQ
CDC dc; aTi2=HL=S
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,orq*Wd
CBitmap bm; kT7x
!7C
int Width=GetSystemMetrics(SM_CXSCREEN); YoC{ t&rY
int Height=GetSystemMetrics(SM_CYSCREEN); Cn\5Vyrl
bm.CreateCompatibleBitmap(&dc,Width,Height); h>0R!Rl8
CDC tdc; op!ft/Yyb
tdc.CreateCompatibleDC(&dc); :vsBobiJ
CBitmap*pOld=tdc.SelectObject(&bm); |:qaF
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Tt^PiaS!
tdc.SelectObject(pOld); o 8fB
BITMAP btm; XFj\H(D
bm.GetBitmap(&btm); 3)D' Yx
DWORD size=btm.bmWidthBytes*btm.bmHeight; o`tOnwt
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FE'|wf
BITMAPINFOHEADER bih; .>X0 $#
bih.biBitCount=btm.bmBitsPixel; @^q|C&j
bih.biClrImportant=0; ;i;2cq
bih.biClrUsed=0; ucP"<,a
bih.biCompression=0; <H; z4
bih.biHeight=btm.bmHeight; tr[(,kX
bih.biPlanes=1; mBAI";L3
bih.biSize=sizeof(BITMAPINFOHEADER); aL)}S%5o?
bih.biSizeImage=size; [nSlkl
bih.biWidth=btm.bmWidth; B7'rbc'
bih.biXPelsPerMeter=0; f{i~hVF
bih.biYPelsPerMeter=0; 2Ra}&ie
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5Q/&,NP
static int filecount=0; !UzMuGj
CString name; p*'%<3ml
name.Format("pict%04d.bmp",filecount++); Wi;wu*
name=m_Path+name; )Bz2-|\
BITMAPFILEHEADER bfh; /5**2Kgv1
bfh.bfReserved1=bfh.bfReserved2=0; DJWm7 t
bfh.bfType=((WORD)('M'<< 8)|'B'); k4HE'WY
bfh.bfSize=54+size; S*aMUV&
bfh.bfOffBits=54; \r.{Ru
CFile bf; 0fOx&"UAB
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ DfPC@`
k
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); h4iz(*
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Y5dt/8Jo
bf.WriteHuge(lpData,size); \OzPDN
bf.Close(); [ClDKswq
nCount++; 2`Dqu"TWh
} H$@5\pP>
GlobalFreePtr(lpData); E%.w6-
if(nCount==1) i(Xz3L#(
m_Number.Format("%d picture captured.",nCount); v0aV>-v
else wI0NotC
m_Number.Format("%d pictures captured.",nCount); "r+ v^
UpdateData(FALSE); tfAO#h tq
} R>C^duos.
<2.87:
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) DqH?:`G
{ d*B^pDf
if(pMsg -> message == WM_KEYDOWN) *UerLpf
{ W{El^')F
if(pMsg -> wParam == VK_ESCAPE) ^Rpy5/d
return TRUE; 4uX|2nJ2!;
if(pMsg -> wParam == VK_RETURN) 8\lRP,-
return TRUE; mJ #|~I*Z-
} /#FU"
return CDialog::PreTranslateMessage(pMsg); NMy+=GZu^
} -%G}T}"_
t| cL!
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) If*+yr|
{ qH=<8Iu
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )0 1,3J>#
SaveBmp();
^ UDNp.6k
return FALSE; u4KP;_,m
} #$dEg
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ !T|q/ri
CMenu pop; X]1Q# $b
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); }Sx+: N*
CMenu*pMenu=pop.GetSubMenu(0); uHQf <R$:
pMenu->SetDefaultItem(ID_EXITICON); u3k{s
CPoint pt; W"meH~[Cp
GetCursorPos(&pt); Gi+ZI{)
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <i$ud&D
if(id==ID_EXITICON) ob_*fP
DeleteIcon(); pYBY"r
else if(id==ID_EXIT) c e\|eN[
OnCancel(); 6Trtulm
return FALSE; !H^e$BA
} T?4I\SG
LRESULT res= CDialog::WindowProc(message, wParam, lParam); LkwjEJQf
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) sX
c|++
AddIcon(); h>:eu#
return res; 3UNmUDl[~
} dI%#cf1
S|Yz5)*
void CCaptureDlg::AddIcon() =>mx>R`S
{ ~Qm<w3oy
NOTIFYICONDATA data; nYb{?{_ca8
data.cbSize=sizeof(NOTIFYICONDATA); eh6\y79g
CString tip; v1`*}.#
tip.LoadString(IDS_ICONTIP); +t
JEG:
data.hIcon=GetIcon(0); /@O$jlX5I
data.hWnd=GetSafeHwnd(); -tH ^Deo
strcpy(data.szTip,tip); GF/!@N
data.uCallbackMessage=IDM_SHELL; i.5?b/l0
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8q/3}AnI
data.uID=98; S)\Yc=~h
Shell_NotifyIcon(NIM_ADD,&data); L#~z#
ShowWindow(SW_HIDE); w|G4c^KH
bTray=TRUE; 4Q?3gA1
} ?.~hex#M@
= lMs1}S9
void CCaptureDlg::DeleteIcon() T*"*##c
{ LcW:vV|'K
NOTIFYICONDATA data; 7Ap==J{a
data.cbSize=sizeof(NOTIFYICONDATA); xV\mS+#
data.hWnd=GetSafeHwnd(); 50R&;+b
data.uID=98; O?OG`{k
Shell_NotifyIcon(NIM_DELETE,&data); U?e.)G
ShowWindow(SW_SHOW); $v\o14v
SetForegroundWindow(); !?aL_{7J
ShowWindow(SW_SHOWNORMAL); K?]c
bTray=FALSE; @x[Arx^?}
} :$f9(f&
nsjrzO79L8
void CCaptureDlg::OnChange() 2_C&p6VGj
{ n:P++^ j
RegisterHotkey(); Ap)pOD7
} =}1m.
OaF[t*]D3
BOOL CCaptureDlg::RegisterHotkey() s;Sv@=\
{ EHlkt,h*
UpdateData(); W&s@2y?rF
UCHAR mask=0; wqE+hKs,
UCHAR key=0; _!C M
if(m_bControl) (>
VD#n
mask|=4; 5tUN'KEbN
if(m_bAlt) ,xOOR
mask|=2; 2od9Q=v~
if(m_bShift) vD91t/_+
mask|=1; iZ;y(
key=Key_Table[m_Key.GetCurSel()]; m[$pj~<\
if(bRegistered){ %<yH6h*u
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 1MYA/l$
bRegistered=FALSE; TO]7 %aB
} +AkMU|6
cMask=mask; bPMkBm
cKey=key; gbr-C
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);
-P>up)p
return bRegistered; VI(2/**
} *U:0c
;h
!wr2OxK*
四、小结 H+?@LPV*N
ykBq?Vr
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。