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:
\(Ma>E4PNU @b(@`yz.a 一、实现方法
AXbb-GK +$C9@CZM9 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
]xRR/S4 CR [>5/:M #pragma data_seg("shareddata")
\GEz.Vb HHOOK hHook =NULL; //钩子句柄
'Xik2PaO UINT nHookCount =0; //挂接的程序数目
aen% static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
#$UwJ B]_D static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
N82 6xvA static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
kqB# 9 static int KeyCount =0;
?NA$<0 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
NfDS6i.Fqp #pragma data_seg()
!Q\*a-C lw3H
8[ 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。
V7WL Gy., n
n F 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:
q
4Pv\YO $~5H-wJ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
>_j(uw?u cKey,UCHAR cMask)
b_sasZo {
G$,s.MSf BOOL bAdded=FALSE;
dOv\] for(int index=0;index<MAX_KEY;index++){
/ /NV_^$y if(hCallWnd[index]==0){
h1S)B|~8 hCallWnd[index]=hWnd;
w6Gez~8 HotKey[index]=cKey;
O.jm{x!m HotKeyMask[index]=cMask;
L9) gN.# bAdded=TRUE;
g#(+:^3' KeyCount++;
{N]WVp*R break;
k2Cq9kQ q }
eFsl }
2#NnA3l]x% return bAdded;
g7323m1= }
IhzY7U)}T //删除热键
QyCrz{/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
=x+1A)Q {
4Pr^>m BOOL bRemoved=FALSE;
mh4 VQ9 for(int index=0;index<MAX_KEY;index++){
XHv
m{z= if(hCallWnd[index]==hWnd){
qGq]E`O if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$-/-%= hCallWnd[index]=NULL;
g5U, HotKey[index]=0;
XOX$uLm HotKeyMask[index]=0;
`XF[A8@h bRemoved=TRUE;
wdj?T`4 KeyCount--;
9+ Mj$ break;
z:S:[X0 }
$cn8]*Z= }
{
1~]}K2 }
{;Hg1=cm return bRemoved;
xJw"
8V< }
l`~$cK! : F3UJ[V Z42q}Fhm*R DLL中的钩子函数如下:
X"3p/!W.4 CnuM=S: LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
^5MM<73 {
H.M:
cD: BOOL bProcessed=FALSE;
ts&\JbL if(HC_ACTION==nCode)
r;b `@
. {
+s_a{iMVP if((lParam&0xc0000000)==0xc0000000){// 有键松开
d_(;sW"I switch(wParam)
?#c "wA& {
8m
H6?,@6 case VK_MENU:
`6-flc0r MaskBits&=~ALTBIT;
/Q W^v;^ break;
?r=`Kl case VK_CONTROL:
Q65M(x+oy MaskBits&=~CTRLBIT;
%{'[S0 @Z break;
O<wH+k[ case VK_SHIFT:
#k<l5x` MaskBits&=~SHIFTBIT;
Q(x=;wf5r break;
e+#Oj default: //judge the key and send message
Q,9KLi3 break;
iuqJPW^} }
m.6uLaD"!} for(int index=0;index<MAX_KEY;index++){
D]d! lMK/ if(hCallWnd[index]==NULL)
9FC_B+7 continue;
o9ys$vXt* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&
:W6O)uY {
x-@?:P* SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
x!85P\sm bProcessed=TRUE;
;[lLFI }
zI"&g]TV5 }
2N-p97"g }
S\ZCZ0 else if((lParam&0xc000ffff)==1){ //有键按下
EhD% switch(wParam)
,]qc#KDq-1 {
oT:wGBW case VK_MENU:
s%#u)nw19 MaskBits|=ALTBIT;
F*z>B >{) break;
$0{h Uex case VK_CONTROL:
{?w*n_T. MaskBits|=CTRLBIT;
3>5gh8!- break;
i+Ne.h case VK_SHIFT:
1mh7fZgn MaskBits|=SHIFTBIT;
[vBP,_Tjx break;
#mM9^LJ default: //judge the key and send message
~yngH0S$[b break;
Ozulp(8* }
a{;+_J3S for(int index=0;index<MAX_KEY;index++){
.1h\r,
# if(hCallWnd[index]==NULL)
]9<H[5>$R continue;
Vl(id_~ _ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
w4^$@GtN {
,DWq SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
4*n1Xu7^x bProcessed=TRUE;
BB/c5?V }
qbD_ }
^}gZ+!kA }
ok-q9dM if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
RU.MJ
kYQ5 for(int index=0;index<MAX_KEY;index++){
4;jAdWj3 if(hCallWnd[index]==NULL)
%0u5d$b q continue;
/lHs]) , if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
<X5V]f SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
RY,L'GtO //lParam的意义可看MSDN中WM_KEYDOWN部分
2*-qEUl1 }
0|\JbM }
H?=[9?1wI5 }
Vn^8nS return CallNextHookEx( hHook, nCode, wParam, lParam );
{j[*:l0Ui }
DM,;W`|6% g]b%<DJ 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:
tuo'Uk) $0M7P5]N*G BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
#)T'a BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
}6__E;h#J sWq}/!@& 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:
)Ps<u- V xnZ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
TYxi&;w {
U|+`Eth8( if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
li` {
WK SWOSJ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
TU| 0I SaveBmp();
JS >"j d# return FALSE;
Nc(A5* }
AUU(fy#< …… //其它处理及默认处理
>ZAn2s }
;[,#VtD M%eTNsbNm /5XdZu6k`h 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。
[}l
1`> 0w$1Yx~C 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
!6+V
%8"Aq 二、编程步骤
I\82_t8 DC$x}1 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";
ZN;fDv cn
;2& 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
jdD`C`w|, T,4REbm^ 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;
HxShNU WZ@$bf}f0 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
I \6^]pi, qUNXT 5、 添加代码,编译运行程序。
tH4+S?PI e0o)Jo.P 三、程序代码
@%As>X<3t p:4oA<V ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
wIQt
f|ZI> #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
4Cf.%f9@ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Y#Pg*C8>8 #if _MSC_VER > 1000
_ Av_jw`m #pragma once
VSm{]Z!x #endif // _MSC_VER > 1000
yLvU@V@~ #ifndef __AFXWIN_H__
n\4sNoFI #error include 'stdafx.h' before including this file for PCH
v}"DW? #endif
KQrG|<J #include "resource.h" // main symbols
%y\ class CHookApp : public CWinApp
, *Z!Bd8 {
4"%LgV`
public:
ohB@ij C! CHookApp();
"[\TL#/ // Overrides
h!]=)7x; // ClassWizard generated virtual function overrides
>VvA&p71b //{{AFX_VIRTUAL(CHookApp)
,y*|f0&"~ public:
P?YcZAJT* virtual BOOL InitInstance();
J?bx<$C@ virtual int ExitInstance();
xAAwH@ + //}}AFX_VIRTUAL
2xpI|+a% //{{AFX_MSG(CHookApp)
q!8aYw+c // NOTE - the ClassWizard will add and remove member functions here.
b(:U]>J // DO NOT EDIT what you see in these blocks of generated code !
FO
xZkU\e= //}}AFX_MSG
XXPpj< c DECLARE_MESSAGE_MAP()
a.s5>:Ct };
,CQg6-[ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
i~EFRI@ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
%pImCpMR BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
rIWQD%Afm BOOL InitHotkey();
:^992]EBEj BOOL UnInit();
'C<4{agS #endif
`-82u :" IkJ-*vI6 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
p u6@X7W" #include "stdafx.h"
59M\uVWR #include "hook.h"
o0F&,|' #include <windowsx.h>
uBfSS\SX| #ifdef _DEBUG
PFPZ]XI%F #define new DEBUG_NEW
5}"9)LT@@w #undef THIS_FILE
AqucP@ static char THIS_FILE[] = __FILE__;
4,qhWe`/ #endif
FWDAG$K@0 #define MAX_KEY 100
&`Ek-b!7 #define CTRLBIT 0x04
RD0=\!w *5 #define ALTBIT 0x02
<K zEn+ #define SHIFTBIT 0x01
ZA6)@Mn #pragma data_seg("shareddata")
)TzQ8YpO} HHOOK hHook =NULL;
R>n=_C UINT nHookCount =0;
{#4F}@Q static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
p5\B0G<m static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
BXB ZX@jVk static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
:"I!$_E' static int KeyCount =0;
cMp#_\B static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
T43Jgk, #pragma data_seg()
.*Ylj2nM HINSTANCE hins;
Z2D^] void VerifyWindow();
![j?/376 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
;HoBLxb P
//{{AFX_MSG_MAP(CHookApp)
`D={l29H // NOTE - the ClassWizard will add and remove mapping macros here.
}*s`R;B|, // DO NOT EDIT what you see in these blocks of generated code!
G#nZ%qQ:I //}}AFX_MSG_MAP
?]PE!7H END_MESSAGE_MAP()
OV,t|
$u
P'> CHookApp::CHookApp()
6w)a.^yx7 {
`A ^ // TODO: add construction code here,
Bw25+l Px // Place all significant initialization in InitInstance
+Fa!<txn }
JK'FJ}Z4 Yh2[
nF_ CHookApp theApp;
,u_ Z0S M LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
sFV&e->AN\ {
_T\cJcWf BOOL bProcessed=FALSE;
5L\&"[' if(HC_ACTION==nCode)
@jY=b< {
k{ ~0BK if((lParam&0xc0000000)==0xc0000000){// Key up
2xK v; switch(wParam)
p(Ux]_s% {
h yK&)y?~ case VK_MENU:
+^|_vq^XR MaskBits&=~ALTBIT;
E.eUd4XG break;
?/|KM8 case VK_CONTROL:
"."ow| MaskBits&=~CTRLBIT;
K*S3{s%UR break;
yc+pNC)ue_ case VK_SHIFT:
*WaqNMD[% MaskBits&=~SHIFTBIT;
{;vLM*
' break;
5yk#(i7C default: //judge the key and send message
ez<V break;
]p!)8[< }
'S%H"W\ for(int index=0;index<MAX_KEY;index++){
%z~=Jz^ if(hCallWnd[index]==NULL)
L Q0e@5 continue;
"fu:hHq if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
C?j:+ {
f~ wgMp.W0 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
nO+R>8,Q bProcessed=TRUE;
&P7Z_&34Z }
)M><09 }
AVi&cvhs }
lHAWZyO else if((lParam&0xc000ffff)==1){ //Key down
o$Ju\(Y$<+ switch(wParam)
^B:;uyG]M {
-}3nIk<N case VK_MENU:
=;Dj[<mJ45 MaskBits|=ALTBIT;
TJCE6QG break;
f@[qS7ok case VK_CONTROL:
RdBIbm MaskBits|=CTRLBIT;
_&%FGcAS break;
?N^1v&Q case VK_SHIFT:
$*|M+ofQ MaskBits|=SHIFTBIT;
&`oybm-p( break;
~7anj. default: //judge the key and send message
#a9O3C/MP break;
b~qH/A}h }
M|NQoQ8q for(int index=0;index<MAX_KEY;index++)
k/(]1QnW {
te4= if(hCallWnd[index]==NULL)
||?@pn\ continue;
flT6y-d if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.5uqc.i"f {
6$[7hlE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`Qjs{H bProcessed=TRUE;
3)yL#hXg) }
Re&"Q8I.8 }
mRa\ wEg% }
s VHk;:e>x if(!bProcessed){
-We9
FO~ for(int index=0;index<MAX_KEY;index++){
hD=.rDvO if(hCallWnd[index]==NULL)
v2_` iwE continue;
yM~bUmSg if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
1
+[sM SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
C!|LGzs0 }
Nte$cTjX }
:AS`1\ C }
vd)zvI return CallNextHookEx( hHook, nCode, wParam, lParam );
&O^-,n }
{`Gd r!
HXhl BOOL InitHotkey()
xJ2I@*DN {
%IZd-N7i^ if(hHook!=NULL){
yOt#6Vw nHookCount++;
15hqoo9! return TRUE;
mf)+ 5On }
x Ek8oc else
r*]pL< hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
3 ye if(hHook!=NULL)
O`Gq7=X nHookCount++;
J|].h return (hHook!=NULL);
tM^4K r~o, }
(6Od BOOL UnInit()
oFf9KHorW {
6tndC
o; ` if(nHookCount>1){
50j8+xJPV nHookCount--;
[ r8 ZAS return TRUE;
F,{mF2U*$ }
Yu>DgMW BOOL unhooked = UnhookWindowsHookEx(hHook);
8M@'A5] if(unhooked==TRUE){
S.)Jp-&K nHookCount=0;
r]UF<*$ hHook=NULL;
(XQuRL<X }
AoeRoqg return unhooked;
m$kQbPlatN }
b.@a,:" acR|X@\3 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
6FQi=}O 1 {
{@^;Nw%J BOOL bAdded=FALSE;
C=/B\G/.9 for(int index=0;index<MAX_KEY;index++){
m&Mupl if(hCallWnd[index]==0){
dy&UF,l6 hCallWnd[index]=hWnd;
]MV8rC[\ HotKey[index]=cKey;
8~]D!c8; a HotKeyMask[index]=cMask;
67YC;J]n=z bAdded=TRUE;
)&Oc7\J, KeyCount++;
^k;]"NR break;
`x#Ud)g }
|zYOCDFf }
Ve3z5d:^ return bAdded;
|4Q*4s }
B6Vlc{c5SO {P]C> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}OL"38P {
:x)H!z
P BOOL bRemoved=FALSE;
D j&~x
for(int index=0;index<MAX_KEY;index++){
3}0\W.jH if(hCallWnd[index]==hWnd){
G
@..?> if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
]R#:Bq!F hCallWnd[index]=NULL;
_U<fS HotKey[index]=0;
.B#
.
HotKeyMask[index]=0;
VThr]$2Y bRemoved=TRUE;
tcuwGs>_ KeyCount--;
w +t@G`d break;
XH"+oW }
LH8jT }
CWn\KR }
-{cHp return bRemoved;
<Kd(fFe }
!Rn6x
$_ /o9T [^\ void VerifyWindow()
h[ DNhR {
s[yWBew for(int i=0;i<MAX_KEY;i++){
Wwq:\C if(hCallWnd
!=NULL){ 1F^Q* t{
if(!IsWindow(hCallWnd)){ {^VtD
hCallWnd=NULL; sgX!4wG&Z
HotKey=0; t4WB^dHYp
HotKeyMask=0; 8M,*w6P
KeyCount--; 1i76u!{U
} {PHH1dC{
} zfIo]M`
} L"bOc'GfQ
} :
\+xXb{
I"07x'Ahq3
BOOL CHookApp::InitInstance() {"y/;x/
{ Xn6#q3;^|
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8Bf>
hins=AfxGetInstanceHandle(); ToXWFX
InitHotkey(); f%Q{}fC{*
return CWinApp::InitInstance(); 3o<d=@`r
} -Zt!H%U
u6qK4*eAD
int CHookApp::ExitInstance() "TV'}HH
{ _C?j\Wy
VerifyWindow(); ')X(P>
UnInit(); f98,2I(>`+
return CWinApp::ExitInstance(); ;O"?6d0
} PobX;Z
LK^|JE u
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Hq3|>OqC2Q
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (o^tmH*
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~wvt:E,fC
#if _MSC_VER > 1000 +HK4sA2;
#pragma once '%N?r,x
C
#endif // _MSC_VER > 1000 ~P4C`Q1PT#
^|Ap_!t$;
class CCaptureDlg : public CDialog S*h52li
{ Ma YU%h0
// Construction NVyBEAoh
public: @CMI$}!{V
BOOL bTray; (`x_MTLL
BOOL bRegistered; [GwAm>k
BOOL RegisterHotkey(); xEb>6+-F@
UCHAR cKey; DeO-@4+qKd
UCHAR cMask; ,+=9Rp`md
void DeleteIcon(); ,/;Aew;
void AddIcon(); s\*L5{kiSl
UINT nCount; {15j'Qwm
void SaveBmp(); 48^-]};
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^QK`z@B
// Dialog Data "F
F$Q#)
//{{AFX_DATA(CCaptureDlg) xQoZ[
enum { IDD = IDD_CAPTURE_DIALOG }; YagfCi ?
CComboBox m_Key; <Xf6?nyZ(
BOOL m_bControl; })g<I+]Hf9
BOOL m_bAlt; ^7gGtz2
BOOL m_bShift; @CprC]X
CString m_Path; > I2rj2M#
CString m_Number; c4JV~VS+
//}}AFX_DATA <2$vo
// ClassWizard generated virtual function overrides Ln"wjO,
//{{AFX_VIRTUAL(CCaptureDlg) EX8JlA\-W
public: d?,'$$ aB
virtual BOOL PreTranslateMessage(MSG* pMsg); 7v: XAU
protected: agIqca;
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b--=GY))F
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [FFr}\}bY
//}}AFX_VIRTUAL Q$%apL
// Implementation L%'J]HL-
protected: P/%7kD@5;
HICON m_hIcon; =i/Df?
// Generated message map functions 5`;SI36"
//{{AFX_MSG(CCaptureDlg) a:FU- ^B4~
virtual BOOL OnInitDialog(); q_M N
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); wu
<0or2
afx_msg void OnPaint(); o`T.Zaik,
afx_msg HCURSOR OnQueryDragIcon(); l:HQ@FX
virtual void OnCancel(); VB |?S|<
afx_msg void OnAbout(); uD\R3cY
afx_msg void OnBrowse(); *x36;6~W;
afx_msg void OnChange(); "LBMpgpU
//}}AFX_MSG ,d"T2Hy
DECLARE_MESSAGE_MAP() c%&,(NJ]K
}; ]OAU&t{
#endif ot0teNF
r,5e/X
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $BqiC!~
#include "stdafx.h" Lg:1zC
#include "Capture.h" ^<;W+dWdU
#include "CaptureDlg.h" =RoE=)1&-
#include <windowsx.h> L+t
/
E`
#pragma comment(lib,"hook.lib") ($di]lbsT
#ifdef _DEBUG r~b.tpH
#define new DEBUG_NEW A95f!a
#undef THIS_FILE U/>I! 7oe
static char THIS_FILE[] = __FILE__; /[R=-s ;
#endif x]^d'o:cDP
#define IDM_SHELL WM_USER+1 hf`y_H+\7
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w,%"+tY_
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Agcss20.
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 1k[_DQ=^l1
class CAboutDlg : public CDialog ,!=
sGUQ)
{ .k#PrT1C
public: ?QP>rm
CAboutDlg(); \XDiw~0
// Dialog Data g#S
X$k-O
//{{AFX_DATA(CAboutDlg) Np\NStx2
enum { IDD = IDD_ABOUTBOX }; ib,`0=0= O
//}}AFX_DATA ~WrpJjI[
// ClassWizard generated virtual function overrides b8!oZ~K
//{{AFX_VIRTUAL(CAboutDlg) ko%mZ0Y
protected: 01(U)F\
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <bcf"0A
//}}AFX_VIRTUAL #X(2
// Implementation 2dts}G
protected: '4,?YcZ?S
//{{AFX_MSG(CAboutDlg) !@C-|=9G
//}}AFX_MSG W ?x~"-*
DECLARE_MESSAGE_MAP() f6r!3y
}; aB%.]bi
Tzd#!Lvm:,
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Zma;An6
{ !(*&P
//{{AFX_DATA_INIT(CAboutDlg) C eEhe
//}}AFX_DATA_INIT FM]clC;X?
} b+Q{Z*
W@"Rdc-
void CAboutDlg::DoDataExchange(CDataExchange* pDX) R0t!y3r&N
{ jV%
VN
CDialog::DoDataExchange(pDX); :k9T`Aa]
//{{AFX_DATA_MAP(CAboutDlg) VEV?$R7;
//}}AFX_DATA_MAP }$)~HmZw
} 5K
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#(
.G;e;w
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) " ILF!z
//{{AFX_MSG_MAP(CAboutDlg) W@!qp
// No message handlers mJ%^`mrI
//}}AFX_MSG_MAP 5Q"yn2b4
END_MESSAGE_MAP() >p&"X 2
@
<gPM/4$G
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~,,r\Y+
: CDialog(CCaptureDlg::IDD, pParent) kB+$Kt<]L
{ B9l~Y/3|
//{{AFX_DATA_INIT(CCaptureDlg) 4EYD5
m_bControl = FALSE; auI`'O`/
m_bAlt = FALSE; zE;|MU@|
m_bShift = FALSE; 5$i(f8*
m_Path = _T("c:\\"); i59}6u_f
m_Number = _T("0 picture captured."); F=5+JjrX
nCount=0; YM#'+wl}`
bRegistered=FALSE; 0L;,\&*u
bTray=FALSE; pZ Uy (
//}}AFX_DATA_INIT ESviWCh0Fl
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Cuylozj$&
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); k8G4CFg}wP
} =lv(
yR5XcPoKI
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) e@c8Ce|0
{ e"1mdw"
CDialog::DoDataExchange(pDX); '!$QI@@
//{{AFX_DATA_MAP(CCaptureDlg) '*[7O2\%/
DDX_Control(pDX, IDC_KEY, m_Key); 6Takx%U
DDX_Check(pDX, IDC_CONTROL, m_bControl); <Z[Z&^
DDX_Check(pDX, IDC_ALT, m_bAlt); aGWO3Nk
DDX_Check(pDX, IDC_SHIFT, m_bShift); -qpvVLR,
DDX_Text(pDX, IDC_PATH, m_Path); ;{8 X+H
DDX_Text(pDX, IDC_NUMBER, m_Number); RrLj5 Jq
//}}AFX_DATA_MAP `D3q!e
} */~|IbZ`o
3N]ushMO
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) lB2F09`
//{{AFX_MSG_MAP(CCaptureDlg) "r`2V-E
ON_WM_SYSCOMMAND() ,or;8aYc#
ON_WM_PAINT() YS4"TOFw
ON_WM_QUERYDRAGICON() t(<k4 ji,
ON_BN_CLICKED(ID_ABOUT, OnAbout) A99;bf}"
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) qAp<OJ
ON_BN_CLICKED(ID_CHANGE, OnChange) ,aWI&ve6
//}}AFX_MSG_MAP
H.hKh
END_MESSAGE_MAP() Z9H2! Cp
ZC$u8$+P
BOOL CCaptureDlg::OnInitDialog() Mmgm6{
{ uJ|,-"~F
CDialog::OnInitDialog(); ,nog6\
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); GQ85ykky
ASSERT(IDM_ABOUTBOX < 0xF000); U4Zx1ieCKH
CMenu* pSysMenu = GetSystemMenu(FALSE); %/)z!}{
if (pSysMenu != NULL) XiV*d06{
{ (7_ezWSl>
CString strAboutMenu; H [M:iV
strAboutMenu.LoadString(IDS_ABOUTBOX); c.Izm+9k
if (!strAboutMenu.IsEmpty()) jn]l!nm
{ ;
p+C0!B2
pSysMenu->AppendMenu(MF_SEPARATOR); xn=mS!"1Zo
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); &]f8Xd
} "1dpv\
} 0LGHSDb
SetIcon(m_hIcon, TRUE); // Set big icon sw$JY}Q8x
SetIcon(m_hIcon, FALSE); // Set small icon R0w~ Z
m_Key.SetCurSel(0); bTx4}>=5l
RegisterHotkey(); 3]\'Q}
CMenu* pMenu=GetSystemMenu(FALSE); (RUc>Qi
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]Gj%-5G
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \HMuVg'Q
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); NUBzc'qb
return TRUE; // return TRUE unless you set the focus to a control *Qngx
} ?iaO+G&|
EnMc9FN(y
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9e;{o,r@
{ =%77~q-HL
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3nq4Y'
{ C-:|A* z
CAboutDlg dlgAbout; mmC MsBfL
dlgAbout.DoModal(); {6}$XLV3l
} OK@yMGz1I
else SQ/}K8uZ
{ kT^`j^Jr
CDialog::OnSysCommand(nID, lParam); W$}2
$}r0U
} s2tNQtq0W
} %@I= $8j
)Zvn{
void CCaptureDlg::OnPaint() *TL3-S?
{ 7&dF=/:X@
if (IsIconic()) JFRbWQ0
{ C]zG@O!
CPaintDC dc(this); // device context for painting .%\R L/
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Z'wGZ(
// Center icon in client rectangle [7{cf`C
int cxIcon = GetSystemMetrics(SM_CXICON); 0sq?>$~Kc*
int cyIcon = GetSystemMetrics(SM_CYICON);
" v'%M({
CRect rect; {FNCC*=
GetClientRect(&rect); e9F+R@8
int x = (rect.Width() - cxIcon + 1) / 2; _bCIVf`
int y = (rect.Height() - cyIcon + 1) / 2; On;7
// Draw the icon ;A?86o'?
dc.DrawIcon(x, y, m_hIcon); [Z[ p@Ux
} {ZUgyGE{
else fo;^Jg.
{ |pT[ZT|}G
CDialog::OnPaint(); 9 b&HqkXX
} aqP"Y9l
} . N5$s2t
Z(ToemF)hi
HCURSOR CCaptureDlg::OnQueryDragIcon() S2V+%Z
_J
{ T#YJ5Xw
return (HCURSOR) m_hIcon; _nIt4l7
} <a(739IF
e1H2w?
s
void CCaptureDlg::OnCancel() iT~ gt/K
{ %G,d&%f
if(bTray) K!tM "`a
DeleteIcon(); p+F>+OQ*
CDialog::OnCancel(); za5E{<0
} E`q)vk
d?[8VfAnh
void CCaptureDlg::OnAbout() 'Y5l3xQk
{ l Ztw[c
CAboutDlg dlg; P7qzZ
dlg.DoModal(); qc/)l~]?g{
} ^B'N\[
t|59/R
void CCaptureDlg::OnBrowse() xtd1>|
{ ?fvK<0S`
CString str; &bwI7cO
BROWSEINFO bi; ?,UO$#Xm
char name[MAX_PATH]; o=Kd9I#
ZeroMemory(&bi,sizeof(BROWSEINFO)); i=`@)E
bi.hwndOwner=GetSafeHwnd(); O<+x=>_
bi.pszDisplayName=name; $_u)~O4$
bi.lpszTitle="Select folder"; 0PJ7o#}_{@
bi.ulFlags=BIF_RETURNONLYFSDIRS; M~*o =t
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Dp;6CGYl?
if(idl==NULL) B"Ttr+
return; =BgQSs/^c
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6;}W)S
str.ReleaseBuffer(); aq]bF%7
m_Path=str; fsV_>5I6
if(str.GetAt(str.GetLength()-1)!='\\') (x8D ]a
m_Path+="\\"; d6g^>}-!t
UpdateData(FALSE); \r&9PkHWo
} HhT6gJWrU
6iJ\7
void CCaptureDlg::SaveBmp() :cE~\BS&
{ &&|c-mD+*
CDC dc; f>ilk Q`
dc.CreateDC("DISPLAY",NULL,NULL,NULL); pa6-3c
CBitmap bm; LX;" Mz>
int Width=GetSystemMetrics(SM_CXSCREEN); ),U>AiF]
int Height=GetSystemMetrics(SM_CYSCREEN); cy( WD#^
bm.CreateCompatibleBitmap(&dc,Width,Height); E3 aj
CDC tdc; gP>`DPgb^
tdc.CreateCompatibleDC(&dc); ? VHOh9|AT
CBitmap*pOld=tdc.SelectObject(&bm); 4w(#`'I>
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7\Wq :<JL
tdc.SelectObject(pOld); e'5sT#T9 l
BITMAP btm; ,&rHBNS
bm.GetBitmap(&btm); r(
8!SVX
DWORD size=btm.bmWidthBytes*btm.bmHeight; ]"-c?%L
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7\ kixfEg
BITMAPINFOHEADER bih; s92SN F}g
bih.biBitCount=btm.bmBitsPixel; 629#t`W\
bih.biClrImportant=0; ])$Rw$`w
bih.biClrUsed=0; ^Z:qlYZ
bih.biCompression=0; FKk.BA957h
bih.biHeight=btm.bmHeight; N Uo
bih.biPlanes=1; #'oGtFCd`
bih.biSize=sizeof(BITMAPINFOHEADER); gSXidh}^
bih.biSizeImage=size; ^z}$'<D9
bih.biWidth=btm.bmWidth; \[W)[mH_
bih.biXPelsPerMeter=0; NmZowh$M
bih.biYPelsPerMeter=0;
@1O.;
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); W60C$*h
static int filecount=0; I2<5#|CXpZ
CString name; hScC<=W
name.Format("pict%04d.bmp",filecount++); s|o+
Im
name=m_Path+name; 3.<E{E!F
BITMAPFILEHEADER bfh; gP:H_nVh
bfh.bfReserved1=bfh.bfReserved2=0; _/@u[dWeL
bfh.bfType=((WORD)('M'<< 8)|'B'); b[`fQv$G
bfh.bfSize=54+size; clO9l=g
bfh.bfOffBits=54; ?S~j2 J]
CFile bf; O#B2XoZa+
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ M5T4{^i
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); D:vX/mf;7
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); VJ()sbl{k
bf.WriteHuge(lpData,size); $I:&5 o i
bf.Close(); .<kbYo:MV
nCount++; 9KGi%UIFvn
} !pAb+6~T
GlobalFreePtr(lpData); .p$tb2%r
if(nCount==1) x4%1P w
m_Number.Format("%d picture captured.",nCount); ?$Jj^/luD
else M
sQ>eSk
m_Number.Format("%d pictures captured.",nCount); {'$+?V"&
UpdateData(FALSE); o%sx(g=q6
} Gx/kel[Y}
e]q(fPK
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \:D"#s%x
{ _fE$KaP
if(pMsg -> message == WM_KEYDOWN) "z9 p(|oZ
{ {?hpW+1,#
if(pMsg -> wParam == VK_ESCAPE) |cIv&\ x
return TRUE; /YHAU5N/}
if(pMsg -> wParam == VK_RETURN) QP:|D_k
return TRUE; "1|\V.>>;
} qEajT"?
return CDialog::PreTranslateMessage(pMsg); Zj5B}[,l\
} s5
($b
E)z=85;_p
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \k>1q/T0V
{ $~r_&1
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ SBh"^q
SaveBmp(); +\)a p
return FALSE; @M&qH[tK-A
} 2 pmqP-pKd
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~>B`T%=H
CMenu pop; g#b9xTGJ^
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Wf:LYL
CMenu*pMenu=pop.GetSubMenu(0); ^\C Fke=
pMenu->SetDefaultItem(ID_EXITICON); lFZl}x
CPoint pt; rBUWzpE"
GetCursorPos(&pt); fprP$MbI
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CRs@x` 5ue
if(id==ID_EXITICON) 7^W(e s
DeleteIcon(); pj#l s
else if(id==ID_EXIT) yV?qX\~*
OnCancel(); ToX--w4
return FALSE; vo>i36
} TX).*%f[r
LRESULT res= CDialog::WindowProc(message, wParam, lParam); C2C1 @=w
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) UU*v5&
AddIcon(); 3nnoXc'
return res; w0^}c8%WR
} H*HL:o-[
wDDNB1_E
void CCaptureDlg::AddIcon() W5,&*mo
{ r1[c+Hy
NOTIFYICONDATA data; <S3s==Cg
data.cbSize=sizeof(NOTIFYICONDATA); %ty`Oa2
CString tip; 7j8lhrM}^
tip.LoadString(IDS_ICONTIP); .t7ME{
data.hIcon=GetIcon(0); ?azcWf z0
data.hWnd=GetSafeHwnd(); Y.kgJ #2
strcpy(data.szTip,tip); *Gul|Lp$<I
data.uCallbackMessage=IDM_SHELL; o 3JSh=
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >R}G
data.uID=98; mgMa)yc!dp
Shell_NotifyIcon(NIM_ADD,&data); ksf6O$
ShowWindow(SW_HIDE); 9,[AfI
bTray=TRUE; 3,?LpdTS
} b/?)_pg
0.)q5B`
void CCaptureDlg::DeleteIcon() gI!d*]{BP
{ W*B=j[w
NOTIFYICONDATA data; >t{-_4Yv?
data.cbSize=sizeof(NOTIFYICONDATA); @FZbp
data.hWnd=GetSafeHwnd(); R@){=8%z
data.uID=98; ,b4oV
Shell_NotifyIcon(NIM_DELETE,&data); _L+j6N.h1
ShowWindow(SW_SHOW); C8x9 Jrc
SetForegroundWindow(); lffw
"
ShowWindow(SW_SHOWNORMAL); V*DD U]0k
bTray=FALSE; q%LjOPE
V
} 3Ak'Ue
QBh*x/J
void CCaptureDlg::OnChange() k~F;G=P
{ Dt!
<
RegisterHotkey(); )"Z6Q5k^
} j
WSgO(y
P=PeWX*L<Z
BOOL CCaptureDlg::RegisterHotkey() v: veKA
{
T%Bz >K
UpdateData(); D|*yeS4>
UCHAR mask=0; y^z
c@f
UCHAR key=0; =X9fn
if(m_bControl) ZZ L@UO>:
mask|=4; AGm=0Om
if(m_bAlt) TOhWfl;
mask|=2; \~g,;>%7Y
if(m_bShift) Si@6'sw
mask|=1; \t5_V)P
key=Key_Table[m_Key.GetCurSel()]; OAD W;fj
if(bRegistered){ r@/@b{=
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Kv2S&P|jXM
bRegistered=FALSE; >bd@2au9!
} 9)t[YE:U3!
cMask=mask; &Q#*Nnb3
cKey=key; &>B"/z
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); I\x9xJ4x
return bRegistered; 8t. QFze?
} 9ln=f=
y$9! rbL
四、小结 &=MVX>[
;>L8&m)R5
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。