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:
R V!o4"\]
`HUf v@5 一、实现方法
!v!N>f4S$ iUr xJh 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:
dDKqq(9(` L)-*,$#<oW #pragma data_seg("shareddata")
za,2r^ HHOOK hHook =NULL; //钩子句柄
Nm8w/Q5D` UINT nHookCount =0; //挂接的程序数目
0^]t"z5f0 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
~,}s(`~ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
LCQkgRs}~{ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
^i<}]c_|f static int KeyCount =0;
;mO,3dV static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
L(WOet( ' #pragma data_seg()
Goj4`Hc j$eCe<.3 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。
gJ\%>r7h 7dD.G/' 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:
Xyv8LB Ku3!*n_\ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Kj*m r%IaU cKey,UCHAR cMask)
4`mO+.za1 {
wL<j:>Ke[3 BOOL bAdded=FALSE;
~4s-S3YzaM for(int index=0;index<MAX_KEY;index++){
Um
;kd if(hCallWnd[index]==0){
KR3-Hb4 hCallWnd[index]=hWnd;
:'w?ye[e HotKey[index]=cKey;
K[?R[ HotKeyMask[index]=cMask;
KCXw n bAdded=TRUE;
r`]7S_t5T KeyCount++;
XUsy.l/ break;
oofFrAaT }
@
t@|q }
>rwYDT#m] return bAdded;
^`&HWp }
PN\V[#nS //删除热键
\:sk9k BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\o9@[t>&2 {
{v+a!#{c7 BOOL bRemoved=FALSE;
i=Kvz4h for(int index=0;index<MAX_KEY;index++){
u[t>Tg2R if(hCallWnd[index]==hWnd){
y<r44a_! if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
onzA7Gre hCallWnd[index]=NULL;
q[boWW HotKey[index]=0;
ZA.fa0n HotKeyMask[index]=0;
aBCOGtf bRemoved=TRUE;
q<}PM KeyCount--;
d5, FM break;
7l}~4dm2J }
n.;3X }
#J.u }
R+^z y"~ return bRemoved;
@+0V& jc }
T` ;k!F46 3Vu8F" CTU9~~Xk DLL中的钩子函数如下:
s<{GpWT8 zMU68vwM LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
pSrsp r {
{@\/a BOOL bProcessed=FALSE;
A}eOR=E if(HC_ACTION==nCode)
)tPl<lb {
?W<cB`J if((lParam&0xc0000000)==0xc0000000){// 有键松开
Y?.gfEXSQo switch(wParam)
>'0lw+a {
<W|1<=z( case VK_MENU:
,$i<@2/=m MaskBits&=~ALTBIT;
Qrz*Lvle h break;
SbJh(V-pr case VK_CONTROL:
]1Qi=2' MaskBits&=~CTRLBIT;
;5RIwD break;
y(a}IM3~ case VK_SHIFT:
9R:(^8P8 MaskBits&=~SHIFTBIT;
VLd=" ~ break;
O<iI default: //judge the key and send message
3AP YO break;
6+#,=!hF{ }
tAt;bYjb\ for(int index=0;index<MAX_KEY;index++){
Eb7}$Ji\ if(hCallWnd[index]==NULL)
67
O<*M continue;
MZiF];OY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|bvGYsn_#= {
W["HDR SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
jrdtd6b} bProcessed=TRUE;
HtS#_y%( }
M[vCpa }
_pW'n=}R }
G%`cJdM else if((lParam&0xc000ffff)==1){ //有键按下
V"U~Q=`K switch(wParam)
]Qy,#p'~&H {
q\G{]dz?R case VK_MENU:
j>g9\i0O1 MaskBits|=ALTBIT;
DUPmq!A break;
`~KAk case VK_CONTROL:
tJG (* MaskBits|=CTRLBIT;
hf[IEK break;
"#J}A0 case VK_SHIFT:
^1vq{/ X MaskBits|=SHIFTBIT;
L`JY4JM" break;
;lk f+,; default: //judge the key and send message
6%z`)d break;
rOhA*_EG }
nO%<;-=u\ for(int index=0;index<MAX_KEY;index++){
kz|[*%10 if(hCallWnd[index]==NULL)
)rS^F<C continue;
2PI #ie4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
B4 <_"0 {
OT"lP(, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
~CJYQFt bProcessed=TRUE;
cxk=|
?l }
"vvFq ,c }
s~#?9vW }
>d)|r if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
_qk9o for(int index=0;index<MAX_KEY;index++){
~v,!n/(' if(hCallWnd[index]==NULL)
hXBqz9 continue;
?~]>H A: if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
}"g@E-]N SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
dfXV1B5 //lParam的意义可看MSDN中WM_KEYDOWN部分
2voNgY }
Z^C!RSQ }
@D2`*C9 }
<,#rtVO$ return CallNextHookEx( hHook, nCode, wParam, lParam );
5@""_n&FV }
8F.(]@NY o^N%;d1%E 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:
!fif8kf Yr Preuh BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
R2 'C s BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
g9! dpP %9cqJ]S 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:
r]xdhR5 s'_$j$1 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
"F04c|oR<X {
FUH*]U if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Pm'.,?" {
sCuQB Z h //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
a'c9XG} SaveBmp();
\"{/yjO|4 return FALSE;
aj%
`x4eA }
'[0
3L9 …… //其它处理及默认处理
%Tk}s fx }
I*%&)Hj~ gDgP;id CA'hvXb. 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。
ZD
iW72&Q }P7xdQ6 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。
+*]SP@|IYI R?i-"JhW 二、编程步骤
bkJn}Al; ?yda.<"g9Y 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";
>!CH7wX )yfOrsM 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
>0[qi1 &L2`L) 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;
T749@! v`z 9p!d Q x 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;
5LnB]dW Au%Wrk3j 5、 添加代码,编译运行程序。
m mw)C" t(Cq(.u`: 三、程序代码
\v B9fA:* \["1N-q b ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
fte!Ll' #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
\L&qfMjW"Z #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
ZfF`kD\ #if _MSC_VER > 1000
rl_1),J\qG #pragma once
+X4ttv #endif // _MSC_VER > 1000
#0#V$AA> #ifndef __AFXWIN_H__
.oB'ttF1 #error include 'stdafx.h' before including this file for PCH
y$"~^8"z #endif
C: TuC5Sr #include "resource.h" // main symbols
jp\JwE class CHookApp : public CWinApp
oQKcGUZ {
[7CH(o1a& public:
j.e`ip CHookApp();
D
z]}@Z*jK // Overrides
C[HE4xF6 // ClassWizard generated virtual function overrides
VbY>l' rY //{{AFX_VIRTUAL(CHookApp)
=iPd@f"$ public:
j8F~j?%! virtual BOOL InitInstance();
u/K)y:ZZ virtual int ExitInstance();
BBZ)H6TzL //}}AFX_VIRTUAL
cviN$oL //{{AFX_MSG(CHookApp)
'{1W)X // NOTE - the ClassWizard will add and remove member functions here.
;FIMCJS // DO NOT EDIT what you see in these blocks of generated code !
FlM.D u //}}AFX_MSG
"Hsq<oV8 DECLARE_MESSAGE_MAP()
+;4AG::GN };
'bQs_ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
;nHo%`Zt BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
_dB0rsCnU% BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
3L\s8O BOOL InitHotkey();
O=9V X BOOL UnInit();
p>w~T#17 #endif
\5v=pDd4g cfQh //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
}r\SP3 #include "stdafx.h"
,T1XX2?: #include "hook.h"
~P_d0A~T #include <windowsx.h>
/(z0I.yE #ifdef _DEBUG
EUYa =- #define new DEBUG_NEW
lFzQG:k@ #undef THIS_FILE
3IRRFIiO static char THIS_FILE[] = __FILE__;
cC(ubUR #endif
B "s8i{Vm #define MAX_KEY 100
@[Jt~v #define CTRLBIT 0x04
Xk7$?8r4& #define ALTBIT 0x02
1&>nL`E[3 #define SHIFTBIT 0x01
~6Ee=NaLzP #pragma data_seg("shareddata")
S]e~)IgO HHOOK hHook =NULL;
+A&IxsTq5= UINT nHookCount =0;
8[{0X4y3 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
<o"D/<XnB3 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
U+3PqWB static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
xN":2qy#T static int KeyCount =0;
'AlSq:gZ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
.w*{=x0k #pragma data_seg()
oW\7q{l2) HINSTANCE hins;
;zxlwdfcr' void VerifyWindow();
=G3J.S*Riy BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
=6 q*w^ET //{{AFX_MSG_MAP(CHookApp)
5IB:4zx^h // NOTE - the ClassWizard will add and remove mapping macros here.
, T%pGku // DO NOT EDIT what you see in these blocks of generated code!
`Mh<S+/ //}}AFX_MSG_MAP
Wcay'#K, END_MESSAGE_MAP()
$dWl A<u (B~V:Yt CHookApp::CHookApp()
VHY<(4@ {
vGMOXbq4& // TODO: add construction code here,
8b#Yd
// Place all significant initialization in InitInstance
<LA`PbQa }
h0EGhJs m6ZbYF-7W CHookApp theApp;
ZJJl944 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
wx?{| {
G5e Ls BOOL bProcessed=FALSE;
7>e~i, if(HC_ACTION==nCode)
Y=wP3q {
@_weMz8} if((lParam&0xc0000000)==0xc0000000){// Key up
S.)8& switch(wParam)
-QNMB4 {
c75vAKZ2 case VK_MENU:
3YNkT"~T MaskBits&=~ALTBIT;
Y.hH
fSp break;
\gW\Sa ^ case VK_CONTROL:
/;(%Xd&: MaskBits&=~CTRLBIT;
zR/p}Wu|! break;
MZ+IorZl case VK_SHIFT:
'[ddE!ta MaskBits&=~SHIFTBIT;
0?*I_[Y break;
m^s2kB4A[ default: //judge the key and send message
-gX2{dW break;
g>oYEFFJ }
mWFZg.#? for(int index=0;index<MAX_KEY;index++){
Q*J ~wuE2 if(hCallWnd[index]==NULL)
TH}ycue continue;
B7jlJqV if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|&pz,"( {
$@f3=NJ4k SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
rp[oH=& bProcessed=TRUE;
$T%<'=u|E }
zSM7x }
m$UT4,Ol }
_"t.1+-K else if((lParam&0xc000ffff)==1){ //Key down
%TggNU, switch(wParam)
}oxaB9r {
";Xbr;N case VK_MENU:
?b' ' MaskBits|=ALTBIT;
7VZ JGRnn break;
t 6IaRD case VK_CONTROL:
gB{R6
\<O MaskBits|=CTRLBIT;
T_B.p*\BM break;
tMk>Bx9[ case VK_SHIFT:
7G=P|T\ MaskBits|=SHIFTBIT;
Da[X
HUk break;
Xm[r#IA default: //judge the key and send message
<!nWiwv break;
->25$5# }
>^ 1S26 for(int index=0;index<MAX_KEY;index++)
KI QBY!N+ {
e/#&5ISk if(hCallWnd[index]==NULL)
_"Ke=v_5 continue;
XI(@O) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=gv/9ce)3 {
cj_?*
SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
*A9{H>Vq bProcessed=TRUE;
}AfPBfgC1z }
#CP, \G }
\gQ+@O&+ }
_89G2)U=C if(!bProcessed){
l@F
e(^5E for(int index=0;index<MAX_KEY;index++){
umrI4.1c if(hCallWnd[index]==NULL)
2o5<nGn continue;
t-'GRme if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
|0!97*H5 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
bQQ/7KM }
>!p K94 }
\ozy_s[ }
jmzvp6N$8 return CallNextHookEx( hHook, nCode, wParam, lParam );
;=
@-j@? }
a^/20UFq Br^b%12ZRS BOOL InitHotkey()
*TI6Z$b|6 {
e Em0c]]9 if(hHook!=NULL){
n#'',4f nHookCount++;
R[-:-8 return TRUE;
)Nd:PnA }
0P/LW|16 else
? bg pUv hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
T.dO0$,Q@$ if(hHook!=NULL)
0J-ux"kfI nHookCount++;
WbzL!zLd! return (hHook!=NULL);
rbS=Ewk }
;-Dd\\)p BOOL UnInit()
S^n4aBm\+ {
}4MG114j if(nHookCount>1){
+!Ag n) nHookCount--;
?6]ZQ\, return TRUE;
|OT%,QT| }
eh(]'%![/ BOOL unhooked = UnhookWindowsHookEx(hHook);
_[tBLGXD if(unhooked==TRUE){
\>dG' nHookCount=0;
#,{v Js~ hHook=NULL;
8~+Msn: }
>c>ar>4xF return unhooked;
w%H#>k }
=gyK*F(RK 5h7DVr! BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
bu5)~|?{t {
Rp9iX~A`e BOOL bAdded=FALSE;
S60`'!y for(int index=0;index<MAX_KEY;index++){
9h=WWu', if(hCallWnd[index]==0){
F
RUt}* hCallWnd[index]=hWnd;
Dv{AZyqe HotKey[index]=cKey;
l7um9@[4 HotKeyMask[index]=cMask;
8+|L ph`/? bAdded=TRUE;
8rNxd=! KeyCount++;
b4PK break;
MT g Eq }
}`]^LFU5 }
$&C%C\(>D return bAdded;
@V u[Tg}J }
M<7*\1 3Ab$ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
J>v>6OC6i {
u8=|{)yL BOOL bRemoved=FALSE;
qT%E[qDS for(int index=0;index<MAX_KEY;index++){
I2Q?7p if(hCallWnd[index]==hWnd){
zwHsdB=v if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
g8yZc}4 hCallWnd[index]=NULL;
\MPy"uC HotKey[index]=0;
Ob+c*@KiW HotKeyMask[index]=0;
]F#kM21 1 bRemoved=TRUE;
xB[#
a* KeyCount--;
q=(wK& break;
fE}}> }
_RVXE
}
h UDEjW@S }
AkC\CdmA return bRemoved;
pDfF'jt9 }
2O>iAzc zqn*DbT
void VerifyWindow()
d|lzkY~ {
?-i&6 i6Y for(int i=0;i<MAX_KEY;i++){
pqX=l%{4ES if(hCallWnd
!=NULL){ p]HtJt|]
if(!IsWindow(hCallWnd)){ 7n.J.<+9
hCallWnd=NULL; c5u?\
HotKey=0; )63w&
HotKeyMask=0; dksnW!
KeyCount--; ar%Rr"
} o*VQH`G*|g
} 4Qs#ws])
} $dVjxo
} J)f?x T*
0't)fnI#
BOOL CHookApp::InitInstance() xRmB?kM3]5
{ EA72%Y9F
AFX_MANAGE_STATE(AfxGetStaticModuleState()); WX9BS$}0
hins=AfxGetInstanceHandle(); SY.V_O$l}
InitHotkey(); 5O*$#C;c
return CWinApp::InitInstance(); ZN/")
} g}7%3D
QG
ia(
int CHookApp::ExitInstance() )^AO?MW
{ >~k
Y{_
VerifyWindow(); H6QQ<~_&
UnInit(); QBg'VV
return CWinApp::ExitInstance(); *{Vyt5
} uv4jbg}Z+3
~-x\E#(
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $@X,J2&
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) eyOAG4QTV
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ (;0]V+-
#if _MSC_VER > 1000 H>?@nYP
#pragma once es{
9[RHK
#endif // _MSC_VER > 1000 ?/D#ql7
,KWeW^z'7
class CCaptureDlg : public CDialog Rp1 OC
{ _GS2&|7`
// Construction =W?c1EPLCx
public: ;#*mB`
BOOL bTray; -\vq-n
BOOL bRegistered; <@P0sd
BOOL RegisterHotkey(); 0td;Ag
UCHAR cKey; Q{l;8MCL
UCHAR cMask; _eS*e-@O5
void DeleteIcon(); hsh
W5j
void AddIcon(); 7e4\BzCC
UINT nCount; OpfFF;"A'
void SaveBmp(); YN^8s
CCaptureDlg(CWnd* pParent = NULL); // standard constructor j"]%6RwM]
// Dialog Data t+
@F"[j
//{{AFX_DATA(CCaptureDlg) 0Pe.G0 #
enum { IDD = IDD_CAPTURE_DIALOG }; H}X"yLog*
CComboBox m_Key; qH$p]+Rk 5
BOOL m_bControl; 1Pbp=R/7ar
BOOL m_bAlt; .(krB%N
BOOL m_bShift; <qu\q \
CString m_Path; -HOCxR
CString m_Number; Z|.z~53;
//}}AFX_DATA 1*5n}cU~
// ClassWizard generated virtual function overrides fw5AZvE6$
//{{AFX_VIRTUAL(CCaptureDlg) s<{c?4T
public: "D+QT+sD
virtual BOOL PreTranslateMessage(MSG* pMsg); +KZc"0?
protected: X~0P+E#
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support YV9%^ZaN7
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }v?{npEOt+
//}}AFX_VIRTUAL h6#
// Implementation c?|/c9f
protected: @<P[z[
HICON m_hIcon; @#p4QEQA
// Generated message map functions ;:cM^LJ
//{{AFX_MSG(CCaptureDlg) d-4u*>
virtual BOOL OnInitDialog(); HO'
HkVA
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {.ph)8
afx_msg void OnPaint(); 4o_1F).\D
afx_msg HCURSOR OnQueryDragIcon(); ~96"^%D
virtual void OnCancel(); ezL*YM8?@
afx_msg void OnAbout(); }rN"H4)
afx_msg void OnBrowse(); @Q'5/q+
afx_msg void OnChange(); Jv5G:M5+~
//}}AFX_MSG E3'6lv'
DECLARE_MESSAGE_MAP() aw~OvnX E
}; Z@>>ZS1Do
#endif U6{ RHS[
W[b/.u5z:
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 2-
)Ml*
#include "stdafx.h" l{k
#include "Capture.h" 'lWNU
#include "CaptureDlg.h" nV'B!q
#include <windowsx.h> i^=an?}/
#pragma comment(lib,"hook.lib") f,$FrI,
#ifdef _DEBUG H_x35|"
#define new DEBUG_NEW bF3j* bpO"
#undef THIS_FILE Z|)~2[Roa
static char THIS_FILE[] = __FILE__; b{sFN!
#endif wM><DrQ
#define IDM_SHELL WM_USER+1 =w8*n2
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >k:)'*
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wH<S0vl
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; y
jb.6
class CAboutDlg : public CDialog d;f,vN(
{ 0FXM4YcrJO
public: bw@tA7Y
CAboutDlg(); 8F%TZM
// Dialog Data M 3^p,[9r#
//{{AFX_DATA(CAboutDlg) g?`w)O7v
enum { IDD = IDD_ABOUTBOX }; !0cfz5t
//}}AFX_DATA Kl^Yq
// ClassWizard generated virtual function overrides c$p1Sovw
//{{AFX_VIRTUAL(CAboutDlg) n^'{{@&(v
protected: NKd):>d%
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v5&WW?IBQ
//}}AFX_VIRTUAL eudPp"Km
// Implementation \HR QSfGt
protected: y`'Ly@s
//{{AFX_MSG(CAboutDlg) L%fWa2P'
//}}AFX_MSG z\fk?Tj<ro
DECLARE_MESSAGE_MAP() 7FWf,IjcGY
}; }(gXlF
UF}fmDi
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) WS;3a}u
{ F
M`pPx
//{{AFX_DATA_INIT(CAboutDlg) n6oVx5/
//}}AFX_DATA_INIT |ek*wo
} e&E*$G@.7
qWo|LpxWt
void CAboutDlg::DoDataExchange(CDataExchange* pDX) DD;PmIW
{ Vb/J`
CDialog::DoDataExchange(pDX); |GIT{_JE
//{{AFX_DATA_MAP(CAboutDlg) #*w$JH
//}}AFX_DATA_MAP X]`\NNx
} I(<1-3~
=MMWcK&
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) a29mVmi >
//{{AFX_MSG_MAP(CAboutDlg) 9gjx!t>`H
// No message handlers tEb2>+R
//}}AFX_MSG_MAP k/Cr ^J"
END_MESSAGE_MAP() L[IjzxUv
m"u 9AOH k
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) GlVq<RG*
: CDialog(CCaptureDlg::IDD, pParent) `,TPd ~#~
{ 0ro)e~_@*
//{{AFX_DATA_INIT(CCaptureDlg) 3fpX
m_bControl = FALSE; GJ!usv u
m_bAlt = FALSE; x<imMJ
m_bShift = FALSE; !m78 /[LW
m_Path = _T("c:\\"); k~Gjfo
m_Number = _T("0 picture captured."); WMrK8e'
nCount=0; T_pE 'U%[
bRegistered=FALSE; 1298&C@
bTray=FALSE; /K'Kx
//}}AFX_DATA_INIT iPxSVH[
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 KPKby?qQ^
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )00#Rrt9
} K{HdqmxL.I
bvZmozbD
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }Dk_gom_
{ L{aT"Of{X
CDialog::DoDataExchange(pDX); }eBy
p
//{{AFX_DATA_MAP(CCaptureDlg) 3&_(D)+
DDX_Control(pDX, IDC_KEY, m_Key); g=a-zg9LX
DDX_Check(pDX, IDC_CONTROL, m_bControl); A9F Z`
DDX_Check(pDX, IDC_ALT, m_bAlt); @"Do8p!*(6
DDX_Check(pDX, IDC_SHIFT, m_bShift); )TG\P,H9
DDX_Text(pDX, IDC_PATH, m_Path); {d=y9Jb^
DDX_Text(pDX, IDC_NUMBER, m_Number); V5R``Tp
//}}AFX_DATA_MAP \\)3:1X
} 6VRVk7"
#uKHw2N
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 4ajBMgD]KG
//{{AFX_MSG_MAP(CCaptureDlg) -j<m0XUQ
ON_WM_SYSCOMMAND() 3vDV
ON_WM_PAINT() ;9d(GP}eE
ON_WM_QUERYDRAGICON() V.;0F%zks5
ON_BN_CLICKED(ID_ABOUT, OnAbout) `Q}.9s_ri
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Q TM+WD
ON_BN_CLICKED(ID_CHANGE, OnChange) <4^a(Zh
//}}AFX_MSG_MAP @ -g^R4e<
END_MESSAGE_MAP() *j8w"
4
&:w{[H$-
BOOL CCaptureDlg::OnInitDialog() :'#BU:
{ hnL(~
CDialog::OnInitDialog(); %kKtPrT
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); LTG/gif[u
ASSERT(IDM_ABOUTBOX < 0xF000); H~&9xtuHN
CMenu* pSysMenu = GetSystemMenu(FALSE); h|_G2p^J+"
if (pSysMenu != NULL) M`AbH19
{ 4{*K%pv\
CString strAboutMenu; UIbVtJ
strAboutMenu.LoadString(IDS_ABOUTBOX); (Z
sdj
if (!strAboutMenu.IsEmpty()) l0Y(9(M@
{ 8ec~"vGLz~
pSysMenu->AppendMenu(MF_SEPARATOR); 7J##IH+z35
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Oxy.V+R
} "!r7t4
} BB=%tz`B
SetIcon(m_hIcon, TRUE); // Set big icon cYW F)WAog
SetIcon(m_hIcon, FALSE); // Set small icon IN),Lu0K
m_Key.SetCurSel(0); DS-Kot(k(z
RegisterHotkey(); IB(5 &u.
CMenu* pMenu=GetSystemMenu(FALSE); N(/DC)DJg
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); V<P@hAAr
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); KG)Y{-Ao
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); *T*MLD]Q
return TRUE; // return TRUE unless you set the focus to a control Pqx=j_st
} 8%I4jL<
7S),:Uy[\
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) RVX-3FvP
{ ;w[|IRa
if ((nID & 0xFFF0) == IDM_ABOUTBOX) :@ 19,.L
{ '0z@Jevd?
CAboutDlg dlgAbout; GXJJOy1"!
dlgAbout.DoModal(); ln#Lx&r;|
} A .*}<
else TE^BfAw@
{ Uo5l
=\
CDialog::OnSysCommand(nID, lParam); b'uH4[zX%
} `[/BG)4
} bZ:w_z[3=
ZN',=&;n'
void CCaptureDlg::OnPaint() 5H`k$[3V
{ ?ZE1>L7e
if (IsIconic()) 8x[q[
{ $UgM7V$
CPaintDC dc(this); // device context for painting zd"o #(sv
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [P,1UO|$B
// Center icon in client rectangle ;&?NuK
int cxIcon = GetSystemMetrics(SM_CXICON); <wc=SMmO
int cyIcon = GetSystemMetrics(SM_CYICON); ?,TON5Fl-
CRect rect;
jats)!:
GetClientRect(&rect); <JDkvpckx.
int x = (rect.Width() - cxIcon + 1) / 2; Z3T:R"l;
int y = (rect.Height() - cyIcon + 1) / 2; |Zncr9b
// Draw the icon eB^:+h#A_
dc.DrawIcon(x, y, m_hIcon); 8xZN4ck_@
} l^WFMeMD3a
else ,B h[jb`y
{ )#M*@e$k
CDialog::OnPaint(); Ga"$_DyM
} 5}E8Tl
} kMf]~EZ?
)nTOIfP2
HCURSOR CCaptureDlg::OnQueryDragIcon() ?RA^Y N*9
{ Azq,N@HO
return (HCURSOR) m_hIcon; ;Rt?&&W
} Skq%S`1%Q
d* 7 Tjs{\
void CCaptureDlg::OnCancel() C/tn0
{ -D`*$rp,
if(bTray) TBvv(_
DeleteIcon(); 4Ts5*_
CDialog::OnCancel(); 83Bp_K2\
} LKFL2|af
x$ ?{)EY
void CCaptureDlg::OnAbout() J$v0
{ wYOSaGyZ0I
CAboutDlg dlg; (KK9/k
dlg.DoModal(); a<rk'4,8a
} J}nE,U2
uJ {N?
void CCaptureDlg::OnBrowse() V2V^*9(wu@
{ XW%!#S&;X
CString str; Cj31'
BROWSEINFO bi; *3s4JK
char name[MAX_PATH]; G<Z|NT
ZeroMemory(&bi,sizeof(BROWSEINFO)); GNT1FR
bi.hwndOwner=GetSafeHwnd(); / F5g@ X&
bi.pszDisplayName=name; WpWnwQY`#
bi.lpszTitle="Select folder"; ,ZC ^,Vq
bi.ulFlags=BIF_RETURNONLYFSDIRS; l{E+j%
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 5kofO
if(idl==NULL) *U)!9DvA
return; ?6; +.h\
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); K#}DXq
str.ReleaseBuffer(); wMT?p/9Blm
m_Path=str; OGzth$7A
if(str.GetAt(str.GetLength()-1)!='\\') uy9k^4Cqa
m_Path+="\\"; Yvcd(2
UpdateData(FALSE); ]o6Or,ml
} XA-DJ
?Xx,[Z&
void CCaptureDlg::SaveBmp() HUfH/x3zj]
{ bYYyXM
CDC dc; 3;u* _ ]N_
dc.CreateDC("DISPLAY",NULL,NULL,NULL); w<|^i*
CBitmap bm;
pBG(%3PpW
int Width=GetSystemMetrics(SM_CXSCREEN); `s Az1/N
int Height=GetSystemMetrics(SM_CYSCREEN); x%jJvwb^|
bm.CreateCompatibleBitmap(&dc,Width,Height); `u3to{
CDC tdc; $,bLK|<hi
tdc.CreateCompatibleDC(&dc); p%jl-CC1
CBitmap*pOld=tdc.SelectObject(&bm); 7^A;.x
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Bq#?g@V
tdc.SelectObject(pOld); weEmUw Z
BITMAP btm; H$9--p
bm.GetBitmap(&btm); NU-({dGK}
DWORD size=btm.bmWidthBytes*btm.bmHeight; ik=~`3Zp0
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S ])Ap'E
BITMAPINFOHEADER bih; D ?1$I0 =
bih.biBitCount=btm.bmBitsPixel; xVao3+r
bih.biClrImportant=0; `i<;5s!rX
bih.biClrUsed=0; j{C+`~O
bih.biCompression=0; ?H#]+SpOcv
bih.biHeight=btm.bmHeight; 4/e-E^
bih.biPlanes=1; ;3s_#L
bih.biSize=sizeof(BITMAPINFOHEADER); L
5J=+k,
bih.biSizeImage=size; =cs;avtL
bih.biWidth=btm.bmWidth; )Fe-C
bih.biXPelsPerMeter=0; F0t!k>
bih.biYPelsPerMeter=0; !?`5r)K
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);
yS _,lS
static int filecount=0; <]r.wn=}M
CString name; co r?#
name.Format("pict%04d.bmp",filecount++); > nDx)!I
name=m_Path+name; ^,]'Ut
BITMAPFILEHEADER bfh; }nvHE o
bfh.bfReserved1=bfh.bfReserved2=0; ,[71,zs
bfh.bfType=((WORD)('M'<< 8)|'B'); ,a9<\bd)
bfh.bfSize=54+size; Z$ {I4a
bfh.bfOffBits=54; N 3i,_
CFile bf; TL ;2,@H`
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +/*g?Vt
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 4&~ft
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0K <@?cI
bf.WriteHuge(lpData,size); [ Lt1OdGl
bf.Close(); .iNPLz1
nCount++; 8zP{Cmm
} vz</|s
GlobalFreePtr(lpData); O4ciD1
if(nCount==1) B @H.O!
m_Number.Format("%d picture captured.",nCount); , |CT|2D>
else rR@ t5
m_Number.Format("%d pictures captured.",nCount); ,F`:4=H%
UpdateData(FALSE); D642}VD
} h@7Shp
wXIsc;
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 6TvlK*<r=
{ h?jy'>T?b2
if(pMsg -> message == WM_KEYDOWN) `VCU`Y
{ DBYD>UA
if(pMsg -> wParam == VK_ESCAPE) x_CB'Rr6
return TRUE; (.-3q;)6
if(pMsg -> wParam == VK_RETURN) % <
D
return TRUE; OM*N) *
} ;Y5"[C9|
return CDialog::PreTranslateMessage(pMsg); PsU.dv[
} POwJhT
QijEb
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
+ulBy
{ cVv+,l4V0
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ RbKAB8
SaveBmp(); 8'Sw?FbVA/
return FALSE; H)(@A W+-
} P/5bNK!
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Xm`jD'G
CMenu pop; -K hXb
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); u0`~
|K
CMenu*pMenu=pop.GetSubMenu(0); P*_!^2
pMenu->SetDefaultItem(ID_EXITICON); Kf2Ob1
CPoint pt; +QT(~<
GetCursorPos(&pt); 3YVG|Bc~_
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); n0 q5|ES
if(id==ID_EXITICON) r e.chQ6
DeleteIcon(); Sh(
else if(id==ID_EXIT) ;
>Tko<
OnCancel(); gO_{(\w*
return FALSE; KoZ" yD
} h<U<KO
LRESULT res= CDialog::WindowProc(message, wParam, lParam); S'#KPzy.
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ye=*m
AddIcon(); q[`)A?Ae
return res; 7Gd)=Q{uur
} [ &RZ&
ES p)%
void CCaptureDlg::AddIcon() ~n9BN'@x
{ [ R1S+i
NOTIFYICONDATA data; <ek_n;R
data.cbSize=sizeof(NOTIFYICONDATA); *jM~VTXwt
CString tip; z6 2gF|Uj
tip.LoadString(IDS_ICONTIP); F#>?i}
data.hIcon=GetIcon(0); ig:,: KN
data.hWnd=GetSafeHwnd(); S7&w r@
strcpy(data.szTip,tip); P -0
data.uCallbackMessage=IDM_SHELL; 9r=@S
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ikf!7-,
data.uID=98; L/dG0a@1X
Shell_NotifyIcon(NIM_ADD,&data); H)S" `j
ShowWindow(SW_HIDE); sJo]$/?F
bTray=TRUE; ,Q!sns[T
} `p1szZD&
S e/VOzzg
void CCaptureDlg::DeleteIcon() U\'.rT[#
{ NKf][!bi
NOTIFYICONDATA data; 6KC.l}Y*
data.cbSize=sizeof(NOTIFYICONDATA); ~Fp,nE-B
data.hWnd=GetSafeHwnd(); |Z'NMJU
data.uID=98; HTiqErD2_
Shell_NotifyIcon(NIM_DELETE,&data); rlTCVmE8[
ShowWindow(SW_SHOW); m|!R/,>S4
SetForegroundWindow(); &m2FEQLj
ShowWindow(SW_SHOWNORMAL); }mQ7N&cC
bTray=FALSE; W<C
\g~\
} pi7Fd\A
(]7&][
void CCaptureDlg::OnChange() yk OJhd3
{ OEmz`JJ67
RegisterHotkey();
J4 [7*v
} UUi@
U
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BOOL CCaptureDlg::RegisterHotkey() \o3)\
e]o
{ , tJ%t#
UpdateData(); dYV'<
UCHAR mask=0; ={,\6a|]:
UCHAR key=0; bE:oF9J?
if(m_bControl) O* `v1>
mask|=4; _|qJ)gD[
if(m_bAlt) \x?q!(;G2
mask|=2; ,5^XjU3c=
if(m_bShift) ;/?M&rX
mask|=1; 2>BWu
key=Key_Table[m_Key.GetCurSel()]; )7@f{E#w
if(bRegistered){ 1sx@Nvlb
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^]:w5\DG
bRegistered=FALSE; LdxrS5
} `F5iZWW1
cMask=mask; 8sb<$M$c
cKey=key; #G2~#\
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); R!IODXP=
return bRegistered; IGz92&y
} ;v%Fw!b032
HnU; N S3J
四、小结 (3 xCW
Ks
8
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。