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:
PdJtJqA8h\
v')Fq[H 一、实现方法
|UM':Ec L #p-AK 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:
i NzoDmE* It!%/Y5 #pragma data_seg("shareddata")
L~Epd.,Dt HHOOK hHook =NULL; //钩子句柄
|)i-c`x UINT nHookCount =0; //挂接的程序数目
o`\l&jUNe static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
gKcP\m static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
x;lIw)Ti static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
(L8H.|. static int KeyCount =0;
sN 1x|pkN static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
~\}%6W[2 #pragma data_seg()
J@(=#z8xS Jg3}U j2By 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。
Lie\3W z}yntY]n 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:
EUmQn8 L{Epkay,{ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
md_aD cKey,UCHAR cMask)
6T&6N0y+9 {
[3;J,P=& BOOL bAdded=FALSE;
`4}zB#3 for(int index=0;index<MAX_KEY;index++){
eI; %/6# if(hCallWnd[index]==0){
SQWwxFJ hCallWnd[index]=hWnd;
bSU9sg\ HotKey[index]=cKey;
()v[@"J HotKeyMask[index]=cMask;
}k7@
X bAdded=TRUE;
yPn5l/pDDr KeyCount++;
]pl g@ break;
KnbT2 }
PDvqA{ }
<a2t"rc return bAdded;
Erl"X}P }
Fl]$ql
//删除热键
g&O%qX- BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}E[S%W[ {
5[]7baO)h1 BOOL bRemoved=FALSE;
+dSe"W9 for(int index=0;index<MAX_KEY;index++){
/@lXQM9T if(hCallWnd[index]==hWnd){
z(iB$;M if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
~0>g 4
D. hCallWnd[index]=NULL;
qxG@Zd HotKey[index]=0;
YMj
z,N HotKeyMask[index]=0;
fI`6]?W bRemoved=TRUE;
6Y)'p
.+g KeyCount--;
*J=`"^BO break;
Jj*XnL* }
bT,]=h"0 }
L9Z:>i? }
-wvrc3F return bRemoved;
}ARWR.7Cc }
i*#Gq6qZq M['8zN `22F@JYN DLL中的钩子函数如下:
fMlxtj+5
8GN0487H LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
z^gf@r {
;iy]mPd BOOL bProcessed=FALSE;
m!er"0 if(HC_ACTION==nCode)
~#h@.yW^JN {
^j[>.D if((lParam&0xc0000000)==0xc0000000){// 有键松开
y;keOI! switch(wParam)
$fPf/yQmC {
`][~0\Y3m case VK_MENU:
vo-n9Bj MaskBits&=~ALTBIT;
5O#CdN-S break;
|#^u%#'[2 case VK_CONTROL:
]QJLES MaskBits&=~CTRLBIT;
q*{i /=~ break;
BLgmFE2 case VK_SHIFT:
lfOF]Kiqr MaskBits&=~SHIFTBIT;
1t+]r:{ break;
m4<8v default: //judge the key and send message
k`62&"T break;
B#&U5fSw+0 }
_:x/\8P for(int index=0;index<MAX_KEY;index++){
yd]W',c if(hCallWnd[index]==NULL)
I;qeDCM continue;
TW(rK& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
30-XFl {
O(!J^J3_z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
"G)-:!H bProcessed=TRUE;
IxAKIa[HY }
1y$Bz?4 }
Vl5}m }
,DqI> vx| else if((lParam&0xc000ffff)==1){ //有键按下
3Ew-Ia%A switch(wParam)
@aN<nd`q) {
uhSRl~tn case VK_MENU:
- U!:. MaskBits|=ALTBIT;
)TnxsFC break;
(5]<t&M case VK_CONTROL:
iIA5ylf{E MaskBits|=CTRLBIT;
W&q]bi@C break;
Qv(}*iq] case VK_SHIFT:
dy-m9fc6% MaskBits|=SHIFTBIT;
kIWQ
_2 break;
Li(}_ default: //judge the key and send message
cx_FtD break;
U=\ZeYK. }
"
|[w.` for(int index=0;index<MAX_KEY;index++){
\\AufAkJ if(hCallWnd[index]==NULL)
cod__. continue;
9F845M if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ac0C,*|^ {
Iz*' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Rx<m+= bProcessed=TRUE;
-"YQo }
2>Hl=bX }
v!27q*;8H }
XrS. [ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
L}UJ`U for(int index=0;index<MAX_KEY;index++){
TCYjj:/ if(hCallWnd[index]==NULL)
3?iRf6;n continue;
#n2'N^t if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
=kH7 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Ox7v*[x' //lParam的意义可看MSDN中WM_KEYDOWN部分
~B;kFdcVXn }
<^snS,06 }
,V'+16xW }
-CtLL_ I return CallNextHookEx( hHook, nCode, wParam, lParam );
8,=N~(pd` }
43-mv1>. DP ,owk 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:
bRT1~) ^BIB'/Kh) BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
l5_RG,O0A BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
3>YG @[h)M3DFd 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:
}tA77Cm)45 by!1L1[JTt LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
rOQ@(aUAZ {
ts%XjCN[ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
piKYO+;W' {
#=C!Xx& //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
s ;EwAd( SaveBmp();
11t+
a,fM return FALSE;
lx_jy>$}r }
,rj_P …… //其它处理及默认处理
y|X</3w }
C^9G \s' {R<0'JU dS]TTU1 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
HwfBbWHr' h6J0b_3h4 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
aVkgE> ?.Mw 二、编程步骤
Y3@\uM`2# h0}r#L 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
;[@);-9q mU0j K@^&M 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Nfe Wmri% 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
\AFoxi2h (ndXz 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
~nYp*t C' ^w]N#%k\H 5、 添加代码,编译运行程序。
;Z>u]uK4+ 12l-NWXf 三、程序代码
u\-WArntc 6&,n\EXF ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
+9mE1$C #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
8 KDF*%7' #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
eh4` a<gC #if _MSC_VER > 1000
pc9m,?n #pragma once
0zJT_H+ #endif // _MSC_VER > 1000
st~
1[in #ifndef __AFXWIN_H__
JF{yhx,+p #error include 'stdafx.h' before including this file for PCH
0_nY70B #endif
R(YhVW_l #include "resource.h" // main symbols
+5:Dy,F= class CHookApp : public CWinApp
U|tUX)9O {
Ek' ~i public:
/~sNx CHookApp();
\tv^],^` // Overrides
BY*{j&^ // ClassWizard generated virtual function overrides
Z8vMVo //{{AFX_VIRTUAL(CHookApp)
RP!!6A6: public:
)y~FeKh virtual BOOL InitInstance();
I^}q;L![\ virtual int ExitInstance();
^:krfXT //}}AFX_VIRTUAL
WY>r9+A?W //{{AFX_MSG(CHookApp)
8bf_W3 // NOTE - the ClassWizard will add and remove member functions here.
V$ 8go#5 // DO NOT EDIT what you see in these blocks of generated code !
%E<.\\^% //}}AFX_MSG
l]g
/rs DECLARE_MESSAGE_MAP()
+/"Ws'5E };
ojmF:hR" LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
:? uUh BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
o7:~C] BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
/#<R BOOL InitHotkey();
<@F.qMl BOOL UnInit();
t(~V:+W 9 #endif
$ ,:3I*}be 2OA0rH"v //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
)GT*HJR(vc #include "stdafx.h"
!O*'mX #include "hook.h"
f`;y
"ba #include <windowsx.h>
F.rNh`44 #ifdef _DEBUG
=D>,s)}o3; #define new DEBUG_NEW
>Bw<THx #undef THIS_FILE
kT-dQ32 static char THIS_FILE[] = __FILE__;
@Sr{6g*I #endif
!g`^<y! #define MAX_KEY 100
%#_"Ie #define CTRLBIT 0x04
o[
Je #define ALTBIT 0x02
c*m7'\ #define SHIFTBIT 0x01
,H)v+lI #pragma data_seg("shareddata")
p&s~O,Bw$ HHOOK hHook =NULL;
QLPb5{>KDS UINT nHookCount =0;
w$)NW57[| static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
>P<8E2}* static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
~|:U"w\[= static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
a<NZC static int KeyCount =0;
$q|-9B static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
}OsAO #pragma data_seg()
?lPn{oB9" HINSTANCE hins;
`iQ])C^d void VerifyWindow();
OGR2Y BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
G (3wI} //{{AFX_MSG_MAP(CHookApp)
& FpoMW // NOTE - the ClassWizard will add and remove mapping macros here.
XsEotW // DO NOT EDIT what you see in these blocks of generated code!
/g]NC? //}}AFX_MSG_MAP
w-j^jU><3 END_MESSAGE_MAP()
$eq*@5B 94}y,\S~ CHookApp::CHookApp()
/'l"Us},^! {
&v/>P1Z
G // TODO: add construction code here,
vf@toYc[E // Place all significant initialization in InitInstance
u9*7Buou^ }
aN;c.1TY
Y2TXWl,Jk CHookApp theApp;
W9G1wU LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
6QYHPz {
b{Bef*`/ BOOL bProcessed=FALSE;
:\]qB& if(HC_ACTION==nCode)
6pdek3pOCt {
v8y !zo' if((lParam&0xc0000000)==0xc0000000){// Key up
@s|G18@ switch(wParam)
m7|S'{+! {
[y&uc case VK_MENU:
rNoCmNm MaskBits&=~ALTBIT;
3(,c^F break;
>H,5MM! case VK_CONTROL:
Y_FQB K U MaskBits&=~CTRLBIT;
9]^q!~u break;
=lmelo#m& case VK_SHIFT:
{rzvZ0-j} MaskBits&=~SHIFTBIT;
w
y&yK*w break;
FM"[:&> default: //judge the key and send message
N5b^ break;
8
+mW }
r@c!M|m@ for(int index=0;index<MAX_KEY;index++){
?BRZ){) if(hCallWnd[index]==NULL)
Ov;q]Vn> continue;
C'6c, if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
L>n^Q:M {
G2dPm}s ZG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
pD]2.O bProcessed=TRUE;
XG!^[ZDs }
cp&1yB
}
n( 9$)B_y }
}\QXPU{UVd else if((lParam&0xc000ffff)==1){ //Key down
Ie}7#>S switch(wParam)
}vd72PB {
e8&7W3 m case VK_MENU:
kvN<o-B MaskBits|=ALTBIT;
? CU; break;
2S//5@~_m case VK_CONTROL:
XCT3:db MaskBits|=CTRLBIT;
n]8*yoge break;
`o0ISJeKp case VK_SHIFT:
#V.u[:mO MaskBits|=SHIFTBIT;
[W99}bi$ break;
rAk;8)O$ default: //judge the key and send message
`_x#`%!#2 break;
69 J4p=c, }
+I@2,T(eG for(int index=0;index<MAX_KEY;index++)
v8TNBsEL {
{KSy I# if(hCallWnd[index]==NULL)
g&\;62lV% continue;
3}B-n!|* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
I7C+XUQkQ {
cqp^**s SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Pk5 %lu bProcessed=TRUE;
orFB*{/Z }
p
~)\! }
<bJ~Ol }
+&*>FeJY if(!bProcessed){
2<*Yq8 for(int index=0;index<MAX_KEY;index++){
D=B :tP if(hCallWnd[index]==NULL)
Q'[~$~&` continue;
W$`
WkR if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
r#d]"3tH SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
0Qg%48u }
=H"%{VeC5 }
HS|x }
fN
1:'d return CallNextHookEx( hHook, nCode, wParam, lParam );
qJ$S3B }
:~p_(rE [n +( BOOL InitHotkey()
p+2uK|T9 {
7N0m7SC if(hHook!=NULL){
,88%eX| nHookCount++;
xG(:O@ return TRUE;
F|&mxsL }
VKi3z%kwK else
*T{KpiuP hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
R~bLEo if(hHook!=NULL)
ik0w\* nHookCount++;
l4OPzNc' return (hHook!=NULL);
L~_zR > }
b{W ,wn BOOL UnInit()
[{J1b {
*gI9CVfQl if(nHookCount>1){
-Q!?=JNtQ nHookCount--;
,7e 2M@=
return TRUE;
E}]SGU" }
p-/}@r3Z+ BOOL unhooked = UnhookWindowsHookEx(hHook);
Pv@;)s(- if(unhooked==TRUE){
!" : arK nHookCount=0;
m>b
i$Y hHook=NULL;
s_,&"-> }
UKSI"/8I return unhooked;
yAc}4*;T/ }
OL[_2m*;9p *tT5Zt/&Sr BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
yNQ 9~P2 {
x[%% )[d BOOL bAdded=FALSE;
Jaf=qwZ/` for(int index=0;index<MAX_KEY;index++){
< YuI}d~' if(hCallWnd[index]==0){
}Z\+Qc<< hCallWnd[index]=hWnd;
14\!FCe)! HotKey[index]=cKey;
$E@ke: HotKeyMask[index]=cMask;
q}5&B=2pM bAdded=TRUE;
Q&9& )8- KeyCount++;
bRAf!<3 break;
Eb9M;u }
j8p'B-yS }
Bb/aeLv return bAdded;
gClDVO }
on1mu't_; Xq%!(YD| BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
{EupB? {
';7|H|,F BOOL bRemoved=FALSE;
}~5xlg$B<< for(int index=0;index<MAX_KEY;index++){
z'X_s.9F if(hCallWnd[index]==hWnd){
1')/ BM2 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
kLqFh< hCallWnd[index]=NULL;
9/|i.2& HotKey[index]=0;
HM1y$ej HotKeyMask[index]=0;
VVje|T^{Z bRemoved=TRUE;
Bj7\{x,? KeyCount--;
2jx+q break;
!ZV#~t:) }
am05>c9 }
;7<a0HZ5! }
9tC8|~Q return bRemoved;
Xl*-A|:j }
YKvFZH) |,&!Q$<un void VerifyWindow()
U>x2'B v {
[%nG_np for(int i=0;i<MAX_KEY;i++){
ddHIP`wb if(hCallWnd
!=NULL){ :7>Si%
if(!IsWindow(hCallWnd)){ 2i(|? XJ^
hCallWnd=NULL; Pjb9FCA'
HotKey=0; )SUN+YV^
HotKeyMask=0; D&9j$#9Rh
KeyCount--; p r0V) C6
} ,n!xzoX_
} v
V^ GIWK
} iK%Rq
} Nyqm0C6m^
?s"v0cg+
BOOL CHookApp::InitInstance() UXk8nH
{ '/
&"
AFX_MANAGE_STATE(AfxGetStaticModuleState()); =OZ_\vO
hins=AfxGetInstanceHandle(); {M~!?#<K
InitHotkey(); wD,F=O
return CWinApp::InitInstance(); D[#\Y+N
} !d0@^JbM"
-% fDfjP
int CHookApp::ExitInstance() I3x}F$^
{ 0\~Zg
VerifyWindow(); eXaDx%mM
UnInit(); *-Yw0Y[E
return CWinApp::ExitInstance(); `(a^=e5
} M{4_BQ4$
6kuSkd$.
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0?h .X=G
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1a!h&!$9
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ v1lj /A
#if _MSC_VER > 1000 `cv:p|s
#pragma once -)I _+N
#endif // _MSC_VER > 1000 mDmWTq\
t]o gn(
class CCaptureDlg : public CDialog )yK!qu
{ ]1[;A$7
// Construction r/T DU[`&
public: HY:@=%R
BOOL bTray; C/Z"W@7#;
BOOL bRegistered; qpeK><o
BOOL RegisterHotkey(); -ur]k]R
UCHAR cKey; DRIv<=Bt
UCHAR cMask; <XagkD
void DeleteIcon(); !jW32$YTR
void AddIcon(); eBV{B70k
UINT nCount; w8i!Qi#y5D
void SaveBmp(); v8IL[g6"
CCaptureDlg(CWnd* pParent = NULL); // standard constructor e`rY]X
// Dialog Data ^hgAgP{{
//{{AFX_DATA(CCaptureDlg) {EUH#':
enum { IDD = IDD_CAPTURE_DIALOG }; ;R!H\
CComboBox m_Key; bsry([N>w
BOOL m_bControl; |@ HdTGD
BOOL m_bAlt; GXRjR\Ch
BOOL m_bShift; K?je(t^
CString m_Path; c" 7pf
T
CString m_Number; zOOX>3^
//}}AFX_DATA ka3Z5
// ClassWizard generated virtual function overrides b9N4Gr
//{{AFX_VIRTUAL(CCaptureDlg) "/fs%F
public: bZXNo
virtual BOOL PreTranslateMessage(MSG* pMsg); j#f&!&G5<&
protected: FudD
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3>" h*U#
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ODEXQl}R
//}}AFX_VIRTUAL Ag6
(
// Implementation eeZysCy+DY
protected: @RIEO%S
HICON m_hIcon; RKkI/ Z0
// Generated message map functions
,<^HB+{Wo
//{{AFX_MSG(CCaptureDlg) J#DcT@
virtual BOOL OnInitDialog(); H@ms43v\
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %},G(>
afx_msg void OnPaint(); )<F\IM
afx_msg HCURSOR OnQueryDragIcon(); l%(`<a]VIB
virtual void OnCancel(); ~bTae =FP
afx_msg void OnAbout(); EiN)TB^]
afx_msg void OnBrowse(); 3{:<z4>{
afx_msg void OnChange(); y
UAn~!s
//}}AFX_MSG A'1AU:d
DECLARE_MESSAGE_MAP() +~Ay h[V
}; |S:!+[
#endif c/Yi0Rl)
y9li<u<PF
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file f<:U"E.
#include "stdafx.h" vfUfrk@D~
#include "Capture.h" YB~t|m65
#include "CaptureDlg.h" F^t?*
#include <windowsx.h> MW~B[%/
#pragma comment(lib,"hook.lib") N"RYM~c7
#ifdef _DEBUG iv+jv2ZF%
#define new DEBUG_NEW G5#}Ed4
#undef THIS_FILE UX`DZb+^
static char THIS_FILE[] = __FILE__; qmeml_(W
#endif |p -R9A*>h
#define IDM_SHELL WM_USER+1 MlK`sH6
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); asN
}
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |;9 A{#zM
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 0nn]]B@l
class CAboutDlg : public CDialog nQ17E{^pR
{ ioNa~F&
public: (}1v^~FXj
CAboutDlg(); rk,1am:cg
// Dialog Data V<2fPDZ
//{{AFX_DATA(CAboutDlg) j'Y"/<
enum { IDD = IDD_ABOUTBOX }; cYM~IA
//}}AFX_DATA Lv5X 'yM
// ClassWizard generated virtual function overrides n_aNs]C9R
//{{AFX_VIRTUAL(CAboutDlg) M2E87w
protected: 3V
Mh)
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support BU:Ecchbr
//}}AFX_VIRTUAL s"',370
// Implementation )@bH"
protected: 6~F#F)C'
//{{AFX_MSG(CAboutDlg) 9c^skNbS
//}}AFX_MSG lIVxW+
DECLARE_MESSAGE_MAP() 5`"*y iv
}; dxn0HXU
1Y"35)CR)
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) f']sU/c=
{ ?S@R~y0K
//{{AFX_DATA_INIT(CAboutDlg) K 5qLBz@U
//}}AFX_DATA_INIT ~+<xFi
} 1rv$?=Z
Xvu)
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Q&upxE4-~
{ q)?p$\
CDialog::DoDataExchange(pDX); A3"1D
//{{AFX_DATA_MAP(CAboutDlg) Qb?y@>-[
//}}AFX_DATA_MAP ~)wwX:;B_
} hg&w=l
?..i 4
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ]M~8@K
//{{AFX_MSG_MAP(CAboutDlg) oE!hF }O
// No message handlers &gWMl`3^*!
//}}AFX_MSG_MAP q8?=*1g
END_MESSAGE_MAP() z [qdmx^
K}PvrcO1
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]{|fYt_-
: CDialog(CCaptureDlg::IDD, pParent) n9kd2[s|
{ [_
M6/
//{{AFX_DATA_INIT(CCaptureDlg) Z[#I"-Q~:
m_bControl = FALSE; QT1:>k
m_bAlt = FALSE; !K3i-zY
m_bShift = FALSE; 3`&VRF8
m_Path = _T("c:\\"); #)_J)/h
m_Number = _T("0 picture captured."); M5']sdR(l
nCount=0; c8#T:HM|`
bRegistered=FALSE; b
A)b`1lI
bTray=FALSE; xw4ey<"I
//}}AFX_DATA_INIT cP*c(k~N
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *nYB o\@g
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @+?+6sS
} PM~bM3Ei
!Z
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void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $42Au2Jg
{ A#Xj]^-*
CDialog::DoDataExchange(pDX);
*-9# /Cp
//{{AFX_DATA_MAP(CCaptureDlg) 'rS'B.D
DDX_Control(pDX, IDC_KEY, m_Key); 3AvVU]@&Z@
DDX_Check(pDX, IDC_CONTROL, m_bControl); KU+( YF$1
DDX_Check(pDX, IDC_ALT, m_bAlt); <9@&oN+T
DDX_Check(pDX, IDC_SHIFT, m_bShift); G$cxDGo
DDX_Text(pDX, IDC_PATH, m_Path); :~t<L%tYF
DDX_Text(pDX, IDC_NUMBER, m_Number); o*%3[HmV
//}}AFX_DATA_MAP TT|-aS0l(u
} $!a?i@
G3H#XK D
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 1 h<fJzh
//{{AFX_MSG_MAP(CCaptureDlg) jZrY=f
ON_WM_SYSCOMMAND() j: <t
ON_WM_PAINT() -{!&/;Z
ON_WM_QUERYDRAGICON() ha_@Yqgh
ON_BN_CLICKED(ID_ABOUT, OnAbout) Nt HbwU,
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) DZJeup?Z
ON_BN_CLICKED(ID_CHANGE, OnChange) N%O[
//}}AFX_MSG_MAP }g}6qCv7
END_MESSAGE_MAP() )j\r,9<K+5
w]n4KR4
BOOL CCaptureDlg::OnInitDialog() !{IC[g n
{ :ezA+=ENg
CDialog::OnInitDialog(); 9QX4R<"wUg
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _~ v-:w
ASSERT(IDM_ABOUTBOX < 0xF000); otU@X 3<_
CMenu* pSysMenu = GetSystemMenu(FALSE); ?3[tJreVj
if (pSysMenu != NULL) 9KXym }
{ -zprNQW
CString strAboutMenu; ?F1wh2oq
strAboutMenu.LoadString(IDS_ABOUTBOX); hPcS,
p{%
if (!strAboutMenu.IsEmpty()) ?J<T
{ C+`xx('N9
pSysMenu->AppendMenu(MF_SEPARATOR); g+.0c=G(
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6?O}Q7G
} oK)[p!D?0{
} &1=g A.ZR
SetIcon(m_hIcon, TRUE); // Set big icon 1XCmMZ
SetIcon(m_hIcon, FALSE); // Set small icon 97!H`|u <
m_Key.SetCurSel(0); A&NqQ
V,
RegisterHotkey(); =w6}\ 'X
CMenu* pMenu=GetSystemMenu(FALSE); ]s_@n!
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {f-XyF1`
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); u-kZW1wrQ
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); /0
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return TRUE; // return TRUE unless you set the focus to a control w m19T7*L
} )Xp Vu
;t|,nz4kJ
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) dKb ^x^
{ ]Ym=+lgi
if ((nID & 0xFFF0) == IDM_ABOUTBOX) -rO*7HO
{ |e:rYLxm:
CAboutDlg dlgAbout; l/M[am
dlgAbout.DoModal(); 4Ppop
} u7[pLtOwN
else s047"Q
{ 4j^bpfb,
CDialog::OnSysCommand(nID, lParam); i$["aP~G
} w]F!2b!
} 8]HY. $E
w]}f6VlEl
void CCaptureDlg::OnPaint() ;7L ;
{ 5~Q Tg
if (IsIconic()) /eb-'m
{ Gp8psH
CPaintDC dc(this); // device context for painting nn'Af,ko/
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :s]\k%"
// Center icon in client rectangle |*ReqM|_C
int cxIcon = GetSystemMetrics(SM_CXICON); ]=|P<F
int cyIcon = GetSystemMetrics(SM_CYICON); {l@WCR
CRect rect; <n\i>A3`,S
GetClientRect(&rect); [EruyWK
int x = (rect.Width() - cxIcon + 1) / 2; tJAnuhX
int y = (rect.Height() - cyIcon + 1) / 2; k/@Tr
:
// Draw the icon Ok,HD7
dc.DrawIcon(x, y, m_hIcon); >9MS"t
} {pC\\}
else ?^. Pt
{ &}E:jt}
CDialog::OnPaint(); ,WGc7NN`
} 6<PW./rk:
} ;P8(Zf3wJb
b Ob
Nc
HCURSOR CCaptureDlg::OnQueryDragIcon() ^obC4(
{ vzG ABP
return (HCURSOR) m_hIcon; \FXp*FbQ
} T0Q51Q
hJLT!33:
void CCaptureDlg::OnCancel() hX3@f;[B2
{ 8jNOEM(0Y+
if(bTray) w&5/Zh[~~L
DeleteIcon(); #QS?s8IrW
CDialog::OnCancel(); Mt=R*M}D0
} }jiK3?e
*Dc@CmBr
void CCaptureDlg::OnAbout() 1mix+.d
{ _*n)mlLln
CAboutDlg dlg; \447]<u
dlg.DoModal(); A%n?}
} 6n,xH!7
Y;eoTJ
void CCaptureDlg::OnBrowse() | k}e&Q_/G
{ g}Mi9Kp
CString str; shzG
Eb
BROWSEINFO bi; \4QH/e
char name[MAX_PATH]; vpV$$=Qwp
ZeroMemory(&bi,sizeof(BROWSEINFO)); Q.E_:=*H
bi.hwndOwner=GetSafeHwnd(); 7>&1nBh. f
bi.pszDisplayName=name; '$6PTa
bi.lpszTitle="Select folder"; O5OXw]
bi.ulFlags=BIF_RETURNONLYFSDIRS; .<.#aY;N
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Bq{]Eh0%
if(idl==NULL) & g$rrpTzv
return; AK;^9b-}q:
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); z<h|#@\
str.ReleaseBuffer(); 1daL y
m_Path=str; DJ|BM+
if(str.GetAt(str.GetLength()-1)!='\\') y@aKNWy}$
m_Path+="\\"; --A&TV
UpdateData(FALSE); gmDR{loX
} Xb0!( (A
sZwZWD'
void CCaptureDlg::SaveBmp() 5zVQ;;9
{ {#9,j]<
CDC dc; KC]tY9 FK
dc.CreateDC("DISPLAY",NULL,NULL,NULL); tvT4S
CBitmap bm; .:[`j3s )Y
int Width=GetSystemMetrics(SM_CXSCREEN); vcM~i^24)
int Height=GetSystemMetrics(SM_CYSCREEN); Ko+al {2
bm.CreateCompatibleBitmap(&dc,Width,Height); vnZ4(
CDC tdc; zb?kpd}r
tdc.CreateCompatibleDC(&dc); wonYm27f
CBitmap*pOld=tdc.SelectObject(&bm); :G0+;[?N
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )$h-ZYc
tdc.SelectObject(pOld); UO1$UF!
QC
BITMAP btm; {(!)P
bm.GetBitmap(&btm); AA2ui%
DWORD size=btm.bmWidthBytes*btm.bmHeight; rmQ\RP W
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #4N >d~
BITMAPINFOHEADER bih; L^)qe^%3
bih.biBitCount=btm.bmBitsPixel; K-6p'|
bih.biClrImportant=0; >Fp&8p`am
bih.biClrUsed=0; -[Y:?lA
bih.biCompression=0; o6|"J%9GX
bih.biHeight=btm.bmHeight; {KsVK4\r
bih.biPlanes=1; *W%'Di
bih.biSize=sizeof(BITMAPINFOHEADER); wx./"m.M
bih.biSizeImage=size; 0$l&i=L
bih.biWidth=btm.bmWidth; Lrlk*
bih.biXPelsPerMeter=0; R}hlDJ/m-
bih.biYPelsPerMeter=0; U1jSUkqb
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5!8-)J-H
static int filecount=0; 2]3G1idB
CString name; [NjajA~z>F
name.Format("pict%04d.bmp",filecount++); %]!?{U\*k
name=m_Path+name; ?;fv!'?%
BITMAPFILEHEADER bfh; )%BT*)x
bfh.bfReserved1=bfh.bfReserved2=0; ]o `4Z"
bfh.bfType=((WORD)('M'<< 8)|'B'); 7>
)l{7
bfh.bfSize=54+size; dX0x
Kk%#
bfh.bfOffBits=54; 4L!e=>as"1
CFile bf; Rd0?zEKV
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ f@L\E>t
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); TtZrttCE6
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); cmae&Atotw
bf.WriteHuge(lpData,size); [:B W+6
bf.Close(); IQ#So]9~Y
nCount++; aC4m{F[
} h ;jsH!
GlobalFreePtr(lpData); hl}dgp((
if(nCount==1) XGL"gD
m_Number.Format("%d picture captured.",nCount); ^,>}%1\
else iKY-;YK
m_Number.Format("%d pictures captured.",nCount); %$^$'6\77
UpdateData(FALSE); 6B
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} uz8nRS s
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) "1AjCHZ
{ W%w82@'
if(pMsg -> message == WM_KEYDOWN) *SWv*sD
{ ]D?oQ$q7
if(pMsg -> wParam == VK_ESCAPE) qgh]@JJh
return TRUE; 2zwuvgiZ
if(pMsg -> wParam == VK_RETURN) 3$;J0{&[i
return TRUE; &MBOAHhze
} /\Jc:v#Q
return CDialog::PreTranslateMessage(pMsg); )_WH#-}
} +HYN$>
zv>ZrFl*
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zR_9D}
{ 9[B<rz
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ L>eQ*311
SaveBmp(); @:I\\S@bN
return FALSE; j@s=ER
} NWaI[P
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "~B~{ _<j
CMenu pop; 9*"[pt+tA
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Be'?#Qe
CMenu*pMenu=pop.GetSubMenu(0); \nn56o@eN
pMenu->SetDefaultItem(ID_EXITICON); 3XM Bu*
CPoint pt; =lw4 H_
GetCursorPos(&pt); \>&@lA
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); _gis+f/8h
if(id==ID_EXITICON) qQ3]E][/
DeleteIcon(); 17?NR\Q
else if(id==ID_EXIT) 6yV5Yjs
OnCancel(); yL^M~lws
return FALSE; qen44;\L
} OLhWkN,qA
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 5M/%%Ox
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) qJe&jLZa
AddIcon(); ZdJVs/33Vn
return res; v]UU&Jq8U
} 5x93+DkO\
TZvBcNi
void CCaptureDlg::AddIcon() xF\}.OfWG
{ Jv '3](
NOTIFYICONDATA data; N?Z+zN&P
data.cbSize=sizeof(NOTIFYICONDATA); oRtY?6^$
CString tip; "RR./e)h
tip.LoadString(IDS_ICONTIP); n]kQtjJ
data.hIcon=GetIcon(0); sWqPw}/3>
data.hWnd=GetSafeHwnd(); k}+MvGq
strcpy(data.szTip,tip); `Lb _J
data.uCallbackMessage=IDM_SHELL; 9g<_JcN
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *IjdN,wox
data.uID=98; Ynk><0g6
Shell_NotifyIcon(NIM_ADD,&data); [5}cU{M
ShowWindow(SW_HIDE); \6nQ-S_
bTray=TRUE; 8H$@Xts
} oK(W)[u
Y_aP:+
void CCaptureDlg::DeleteIcon() 9>}(]T
{ ajcPt]f
NOTIFYICONDATA data; l72ie
data.cbSize=sizeof(NOTIFYICONDATA); MFCbx>#
data.hWnd=GetSafeHwnd(); wKeSPs{x
data.uID=98; i85+p2i7
Shell_NotifyIcon(NIM_DELETE,&data); ux/[d6To
ShowWindow(SW_SHOW); 8gu7f;H/k
SetForegroundWindow(); %3@RZe
ShowWindow(SW_SHOWNORMAL); [4+a 1/^
bTray=FALSE; 2C
8L\
} JVIcNK)
=c5 /cpZ^
void CCaptureDlg::OnChange() jT wM<?
{ G+\~rl
RegisterHotkey(); .-1{,o/&Q
} !A ydhe
=>9.@`.
BOOL CCaptureDlg::RegisterHotkey() tr67ofld|
{ /n<Ncf
UpdateData(); a_#eGe>
UCHAR mask=0; Z:o'
+oh
UCHAR key=0; szM=U$jKq
if(m_bControl) ED =BZR
mask|=4; ]aMa*fF
if(m_bAlt) A?{aUQB~|
mask|=2; qT-nD}
if(m_bShift) WTy8 N
mask|=1; OHa{!SaL
key=Key_Table[m_Key.GetCurSel()]; *MyS7<
if(bRegistered){ %onAlf<$:^
DeleteHotkey(GetSafeHwnd(),cKey,cMask); TQxc?o
bRegistered=FALSE; iTBhLg,
} b\uB
cMask=mask; iRr&'k
cKey=key; =ym~=
S
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); HDXjH|of
return bRegistered; mYs->mg1
} J;]@?(
d-S'y-V?d
四、小结 %cjGeS6}
cd%g]T)#1
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。