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:
j<ABO")v
k5aa>6K 一、实现方法
!F+|Y"c .DDg%z 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:
lL(p]!K' &G-#*OG #pragma data_seg("shareddata")
S2rEy2\}: HHOOK hHook =NULL; //钩子句柄
0i8[= UINT nHookCount =0; //挂接的程序数目
!,Xyl}
# static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
5)d,G9 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
sf |oNOz static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
YN,y0t/cQ static int KeyCount =0;
y+4?U static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
}BI~am_ #pragma data_seg()
Wl&
>6./{ t7um
[ 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。
{cR_?Y@ AI1@- 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:
:DtZ8$I`]C UF&0&`@ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
'Q:i&dTg cKey,UCHAR cMask)
cWN d<=Jp {
MzEm*`< BOOL bAdded=FALSE;
je&dioZ> for(int index=0;index<MAX_KEY;index++){
I~\O if(hCallWnd[index]==0){
zwM"`z hCallWnd[index]=hWnd;
T}n N=Q4 HotKey[index]=cKey;
^>N8*=y HotKeyMask[index]=cMask;
Q`.'-iq bAdded=TRUE;
jo9J%vo KeyCount++;
`z9)YH break;
2d-TU_JqX }
VHXI@UT* }
"gXxRHTX return bAdded;
#4P8Rzl$/ }
>I$B= //删除热键
K #qoR /: BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
&`9j)3^J. {
{ 1+Cw?1d BOOL bRemoved=FALSE;
A",eS6 for(int index=0;index<MAX_KEY;index++){
i\t753<Ys if(hCallWnd[index]==hWnd){
xS=_yO9- if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
<8u>_o6 hCallWnd[index]=NULL;
0JmFQ^g( HotKey[index]=0;
R%>jJ[4\[ HotKeyMask[index]=0;
,>D ja59 bRemoved=TRUE;
8[8|*8xqs KeyCount--;
oN *SRaAp break;
cC^W2\ }
9@:BK;Fi }
v6wRME;JA }
_*O7l return bRemoved;
3p:=xL }
<+V-k| ?qju
DD /8f>':zUb DLL中的钩子函数如下:
an3~'g? AXz-4,=xX LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
u@<Pu@?xm {
:lUX5j3 BOOL bProcessed=FALSE;
K@B" ]6 if(HC_ACTION==nCode)
<^d!Vzr] {
cNe0x2Z$? if((lParam&0xc0000000)==0xc0000000){// 有键松开
6ayy[5tW switch(wParam)
U
z"sdi {
8]S,u:E:N case VK_MENU:
~mtTsZc MaskBits&=~ALTBIT;
~j=xi P break;
):e+dt case VK_CONTROL:
J!rY
6[t MaskBits&=~CTRLBIT;
2zz,(RA break;
j:7*3@f case VK_SHIFT:
:.Y|I[\E% MaskBits&=~SHIFTBIT;
dVa!.q_3 break;
O/mR9[} default: //judge the key and send message
r]v&t break;
&=YSM.G }
yH*hL0mO for(int index=0;index<MAX_KEY;index++){
ODm&&W#* if(hCallWnd[index]==NULL)
G 0hYFc u continue;
@&;(D!_& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
zJ5hvDmC {
vkJ)FEar SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
}i(qt&U; bProcessed=TRUE;
5?Bc
Y; }
! 0^;;' }
fV 3r|Bp }
^V[/(Lq else if((lParam&0xc000ffff)==1){ //有键按下
)CJES!!
W switch(wParam)
#,G1R7 {
1Q]Rd case VK_MENU:
2d-{Q8Pi MaskBits|=ALTBIT;
cgyp5\*>+ break;
l';pP^.q case VK_CONTROL:
<j;]!qFR MaskBits|=CTRLBIT;
C\7u<2c break;
~8TF*3[}[ case VK_SHIFT:
sI'a1$ MaskBits|=SHIFTBIT;
qpI]R break;
nP<S6:s: default: //judge the key and send message
S.{fDcM break;
q(78fZ *X }
1pK6=-3w3 for(int index=0;index<MAX_KEY;index++){
_3/ec]1 if(hCallWnd[index]==NULL)
Jm4#V~w continue;
5k]XQxc6_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
w!\3ICB {
TXjloGv^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
_K'7(d0z bProcessed=TRUE;
JBz}|MD }
9RH"d[%yc} }
%<ic%gt`# }
v9=}S\=Cd if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
s.VA!@F5 for(int index=0;index<MAX_KEY;index++){
$/+so;KD if(hCallWnd[index]==NULL)
} ~| k continue;
^-hEr sK if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
[>f]@> SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
6gnbkpYi //lParam的意义可看MSDN中WM_KEYDOWN部分
&f-hG3/M }
Z0-ytODII }
&R,9+c }
>)NQH9'1 return CallNextHookEx( hHook, nCode, wParam, lParam );
eX"''PA }
eJHp6)2 3+ =I;nj 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
mk%b9Ko<F f8=]oa] BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
`N}d}O8
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
S/.^7R7{f \:Za[6 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
; DDe.f" Q8q@Y R# LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
eZH~je{1 {
x0A7O if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
D^+?|Y@N {
<*<U!J-i //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
z}+i=cAN SaveBmp();
RP!
X8~8 return FALSE;
)u*^@Wo }
GKZN}bOm\ …… //其它处理及默认处理
*)'V vu< }
[k$efwJ oZN'HT _7"5wB?|+ 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。
/aY pIMi9} 8.QSqW7t 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。
)6-9)pH@) F}36IM9/: 二、编程步骤
o5!f#Y ~jN'J+_$ 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";
eh(<m8I SJk>Jt= 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
A_R!uRD8- iidT~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;
/7/0x ./{ FJ54S 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;
MzkkcQLK XN;&qR^j 5、 添加代码,编译运行程序。
BMFF= Q`ME@vz 三、程序代码
S_b/DO q/PNJ#< ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
^A9M;q #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
fDh]tua #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
.tnkT;T #if _MSC_VER > 1000
/Vww?9U; #pragma once
y9 L14 #endif // _MSC_VER > 1000
`s"d]/85VW #ifndef __AFXWIN_H__
d
~`V7B2Y #error include 'stdafx.h' before including this file for PCH
w5,Mb #endif
[syj# #include "resource.h" // main symbols
hH>``gK class CHookApp : public CWinApp
G$bJ+ {
W\cjdd public:
,SUT~oETP CHookApp();
taWqSq! // Overrides
I:l01W; // ClassWizard generated virtual function overrides
5l{Ts04k% //{{AFX_VIRTUAL(CHookApp)
Kct@87z public:
28I^$> [ virtual BOOL InitInstance();
KpHw-6" virtual int ExitInstance();
YcDe@Zuwn //}}AFX_VIRTUAL
@S^ASDuQU7 //{{AFX_MSG(CHookApp)
fjG&`m#" // NOTE - the ClassWizard will add and remove member functions here.
wTc)S6%7 // DO NOT EDIT what you see in these blocks of generated code !
`yO'[2 //}}AFX_MSG
HrM$NRhu DECLARE_MESSAGE_MAP()
q7\Ovjs0 };
F<|t\KOW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
B^v8,;jZT BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
>IfV\w32 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
f&KdlpxKv BOOL InitHotkey();
k N7Bd} BOOL UnInit();
Bc5+ss #endif
5B4Ssrs5W~ p3(2?UO! //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
*ZrSiIPP #include "stdafx.h"
!t#F/C #include "hook.h"
WFTvOFj #include <windowsx.h>
eiVC"0-c} #ifdef _DEBUG
aZS7sV28 #define new DEBUG_NEW
!&^gaUa{ #undef THIS_FILE
A7Po 3n%Q static char THIS_FILE[] = __FILE__;
:-T*gqj| #endif
-NJ!g/ >mM #define MAX_KEY 100
JRaq!/[( #define CTRLBIT 0x04
YHXLv#8 #define ALTBIT 0x02
nz]&a1"& #define SHIFTBIT 0x01
0#_'o , #pragma data_seg("shareddata")
i3$$,W! HHOOK hHook =NULL;
oUZoj2G1 UINT nHookCount =0;
2JGL;U$ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
H`9Uf) static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
~f\G68c static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
O+q/4 static int KeyCount =0;
88s/Q0l static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
8'
DW#% #pragma data_seg()
~`ny@WD9 HINSTANCE hins;
};L ^w: void VerifyWindow();
_}xd}QW BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
I:cg}JZ>| //{{AFX_MSG_MAP(CHookApp)
Yf@e=: // NOTE - the ClassWizard will add and remove mapping macros here.
L{-LX=G^ // DO NOT EDIT what you see in these blocks of generated code!
=c.5874A` //}}AFX_MSG_MAP
W/$Zvl END_MESSAGE_MAP()
QS[L~97m2M PNs~[ CHookApp::CHookApp()
=FP0\cQ. {
4GdX/6C. // TODO: add construction code here,
>$WQxbwM( // Place all significant initialization in InitInstance
NoE*/!Sr }
4<dcB@v *cuuzi& CHookApp theApp;
v=@TWEE LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
\y`+B*\i {
hj%ye~|~ BOOL bProcessed=FALSE;
9;.(u'y| if(HC_ACTION==nCode)
:KJ pk:< {
\NZIEu)5? if((lParam&0xc0000000)==0xc0000000){// Key up
bNs4 5hDP switch(wParam)
w'MGA {
V"\0Y0 case VK_MENU:
^!<dgBNj MaskBits&=~ALTBIT;
H,3\0BKk break;
OJ|r6 case VK_CONTROL:
8BOZh6BV MaskBits&=~CTRLBIT;
,l YE break;
c/N@zum,{ case VK_SHIFT:
"5R~(+~<@ MaskBits&=~SHIFTBIT;
sV"UI break;
i<kD default: //judge the key and send message
q;g>t5]a break;
^hNgm.I }
,2Q o7(A for(int index=0;index<MAX_KEY;index++){
IJYL s
if(hCallWnd[index]==NULL)
!G^L/?z3 continue;
c#-U%qZ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
wI]"U2L5 {
tz4
]qOH8 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
gI^oU4mq bProcessed=TRUE;
BS Iy+ }
%,Sf1fUJ }
F:@70(<w% }
[FA{x?vkf else if((lParam&0xc000ffff)==1){ //Key down
c\B|KhDk switch(wParam)
Vtc36-\1* {
* _a@z1 case VK_MENU:
x-OA([;/ MaskBits|=ALTBIT;
f=C ,e/sw break;
!tfb*@{;' case VK_CONTROL:
IW 21T MaskBits|=CTRLBIT;
S#)Eom?V break;
/Jf.y*; case VK_SHIFT:
F<>!kK/c MaskBits|=SHIFTBIT;
B~o\+n break;
wW>zgTG default: //judge the key and send message
)[0T16 break;
f` =CpO* }
@KX
\Er for(int index=0;index<MAX_KEY;index++)
(" LQll9 {
kt`nbm|aw if(hCallWnd[index]==NULL)
];.pK continue;
7+X:LA~U if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
"k]CW\H6z {
G9g1hie@% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
O"Ku1t! bProcessed=TRUE;
O+g3X5f+ }
*
#jsgj[ }
mPI8_5V8] }
0/S_e)U if(!bProcessed){
}ci#> for(int index=0;index<MAX_KEY;index++){
3 "o"fl if(hCallWnd[index]==NULL)
s!n<}C continue;
8} =JKR^cK if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
nF6q7 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
PH"n{lW.T }
5>BK%` }
f$NM M
>z }
=t6z \WB return CallNextHookEx( hHook, nCode, wParam, lParam );
[2"<W!p }
G}&Sle] tOfg?)h{dc BOOL InitHotkey()
\j&^aAp r {
UnI48Y if(hHook!=NULL){
-S3MH1TZ nHookCount++;
$O9^SB return TRUE;
Neg,qOt }
!9Aaj<yxm else
T&Lb<'f hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
sB;@>NY if(hHook!=NULL)
8_T6_jL< nHookCount++;
[9Ss#~ return (hHook!=NULL);
sC9&Dgkk }
=bEda] BOOL UnInit()
I\YV des# {
w@N if(nHookCount>1){
h;6lK$!c nHookCount--;
ByCnD return TRUE;
`jwa<N4e@ }
.'Y]R3\M+ BOOL unhooked = UnhookWindowsHookEx(hHook);
e{m2l2Tx: if(unhooked==TRUE){
-_`>j~ nHookCount=0;
,o)d3g-&g hHook=NULL;
%-d]X{J: }
76u&EG% return unhooked;
`uC@nJ }
g!-,] 4;2< ^[M BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
7Hm3;P. {
(V4
~`i4V BOOL bAdded=FALSE;
&hRvol\J for(int index=0;index<MAX_KEY;index++){
K)J(./ if(hCallWnd[index]==0){
7b<yVP;{ hCallWnd[index]=hWnd;
ULQMG'P^D HotKey[index]=cKey;
hWX% 66 HotKeyMask[index]=cMask;
\Gc+WpS( bAdded=TRUE;
Z)jw|T'X KeyCount++;
"HPB!)C8( break;
i&VsW7 }
_cXqAo[V }
} \ZaE~ return bAdded;
XLH0 ;+CL{ }
]CoeSA`j &L^+BQ`O? BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
9uGrk^<t {
By% =W5 BOOL bRemoved=FALSE;
vd8{c7g:n for(int index=0;index<MAX_KEY;index++){
!Y-98<|b
M if(hCallWnd[index]==hWnd){
|+T1XYG5 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
ztw@Y|<2 hCallWnd[index]=NULL;
YCP) %} HotKey[index]=0;
y\a1iy HotKeyMask[index]=0;
'0FhL)x?"T bRemoved=TRUE;
t+eVR8 KeyCount--;
l8?>>.<P= break;
2 $Tj84'X }
#5f-`~^C{ }
M@5?ZZ4L }
f"<O0Qw return bRemoved;
xP [n }
/n>qCuw M%@ !cW void VerifyWindow()
p`l0?^r
c" {
o_'p3nD for(int i=0;i<MAX_KEY;i++){
iRrl^\qn if(hCallWnd
!=NULL){ lBaR
if(!IsWindow(hCallWnd)){ [D!jv"
hCallWnd=NULL; d+'p@!W_
HotKey=0; ariLG [:X
HotKeyMask=0; nJo`B4'U
KeyCount--; NUp<e%zB
} %@u;5qD&
} Sv +IS
}
OVV]x{
} NgY=&W,
ll C#1
BOOL CHookApp::InitInstance() :53)Nv
{ }5hqDBK?
AFX_MANAGE_STATE(AfxGetStaticModuleState()); (2=Zm@Zpf
hins=AfxGetInstanceHandle(); kO}AxeQ
InitHotkey(); .,OVzW
return CWinApp::InitInstance(); s D=n95`v
} -YCOP0
7R`mf
int CHookApp::ExitInstance() Nd;Ku6
{ hC\6-
0u
VerifyWindow(); 49vcoHlf
UnInit(); Qc pm!
return CWinApp::ExitInstance(); R;j!}D!4
} G%s2P.cd
Iu <?&9t
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file F F|FU<
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Pqn@ST
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ (_"*NY0
#if _MSC_VER > 1000 T7#W0^tj
#pragma once 07[_.i.l
#endif // _MSC_VER > 1000 @w?P7P<O`
#Jw1IcuH
class CCaptureDlg : public CDialog *"{lMZ+
{ C<P%CG&;
// Construction 2Tagr1L
public: R.yC(r
BOOL bTray; i{`;R
BOOL bRegistered; GgB,tam{p
BOOL RegisterHotkey(); ?W)A
UCHAR cKey; vMm1Z5S/
UCHAR cMask; lGOgN!?i
void DeleteIcon(); Vb= Mg
void AddIcon(); Wh.?j>vB
UINT nCount; /@,j232
void SaveBmp(); h"/<?3{
CCaptureDlg(CWnd* pParent = NULL); // standard constructor @g&ct>@y
// Dialog Data ^Gqt+K%
//{{AFX_DATA(CCaptureDlg) t$De/Uq
enum { IDD = IDD_CAPTURE_DIALOG }; #n#@fAY
CComboBox m_Key;
wwyPl
BOOL m_bControl; "t~
BOOL m_bAlt; SgS~ {4Zx*
BOOL m_bShift; FSA1gAW6g
CString m_Path; p{j.KI s7
CString m_Number; PEc=\?
//}}AFX_DATA -}KC=,]vh
// ClassWizard generated virtual function overrides 0Nnsjh
//{{AFX_VIRTUAL(CCaptureDlg) 3GUZ;jdn
public: `0Oh_8"
virtual BOOL PreTranslateMessage(MSG* pMsg); "$2y-|
protected: n:{qC{D-qS
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 'coV^~qy
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); pLLGus+W
//}}AFX_VIRTUAL Bi
@2
// Implementation O4og?h>
protected: y9>ZwYN
HICON m_hIcon; ~2gG(1%At9
// Generated message map functions %3ICI
//{{AFX_MSG(CCaptureDlg) 1f":HnLRM
virtual BOOL OnInitDialog(); 3ZXQoC '
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); hMykf4
afx_msg void OnPaint(); v#U"pn|M
afx_msg HCURSOR OnQueryDragIcon(); 7G/1VeVjB
virtual void OnCancel(); Pc
NkAo
afx_msg void OnAbout(); N-e @j4WU
afx_msg void OnBrowse(); [<
&oF
afx_msg void OnChange(); a
0GpfW$t
//}}AFX_MSG AMyIAZnYq)
DECLARE_MESSAGE_MAP() B>0].CK`
}; gk0( ANx
#endif fmb} 2h
"HDcmIXg&
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file yFtd=AI'E
#include "stdafx.h" %nV]ibp2)
#include "Capture.h" Cd>WUw
#include "CaptureDlg.h" "O%gFye
#include <windowsx.h> MP4z-4Y
#pragma comment(lib,"hook.lib") ZHm7Isa1
#ifdef _DEBUG PqiB\~o@Z
#define new DEBUG_NEW T^Ze3L]
#undef THIS_FILE 9Ru8~R/\
static char THIS_FILE[] = __FILE__; mjKS{
#endif Yd#/1!A7u
#define IDM_SHELL WM_USER+1 {l/-LZ.
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Nw1#M%/!r!
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A^y|J`k|
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; }wHW7SJ
class CAboutDlg : public CDialog 6{^E{go
{ Is{KN!Hw
public: 5*,f
Fib
CAboutDlg(); L 8dc(Z%v
// Dialog Data -6n K<e`
//{{AFX_DATA(CAboutDlg) X ><?F|#7T
enum { IDD = IDD_ABOUTBOX }; HLV2~5Txc
//}}AFX_DATA !3*(N8_|#
// ClassWizard generated virtual function overrides [&#/]Ul'
//{{AFX_VIRTUAL(CAboutDlg) 3<
2}V
protected: aD=A^ktx
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support SU/BQ3
//}}AFX_VIRTUAL *rIk:FehLB
// Implementation ;3B1_vo9
protected: NqDHCI
//{{AFX_MSG(CAboutDlg) 9.a3&*tV[
//}}AFX_MSG #]ypHVE
DECLARE_MESSAGE_MAP() :n.f_v}6
}; urMG*7i <c
w[IE
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) RIY,K*f.
{ enSXP~9w
//{{AFX_DATA_INIT(CAboutDlg) Z(ACc9k6:'
//}}AFX_DATA_INIT `m!j$,c.
} LYaZ1*
/oR<A
void CAboutDlg::DoDataExchange(CDataExchange* pDX) O4^8jK}
{ t ]_VG
CDialog::DoDataExchange(pDX); Pyb Z)5u
//{{AFX_DATA_MAP(CAboutDlg) LRb{hUt=
//}}AFX_DATA_MAP p%*%n3bw
} A<qTg`gA
xK6n0] A
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) I~Zh@d%
//{{AFX_MSG_MAP(CAboutDlg) w6{TE(]zp
// No message handlers Y[$!`);Ye
//}}AFX_MSG_MAP \8?Tdx=
END_MESSAGE_MAP() a6WI170^1
/iJ4{p
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) c%'RR?Tl
: CDialog(CCaptureDlg::IDD, pParent) GJtZ&H
{ &'}RrW-s
//{{AFX_DATA_INIT(CCaptureDlg) 17G'jiYH
m_bControl = FALSE; TTt#a6eJ
m_bAlt = FALSE; .tzG_
m_bShift = FALSE; :]^P1sH[
m_Path = _T("c:\\"); NT+?#0I
m_Number = _T("0 picture captured."); Z^IPZF
nCount=0; #>mr[
bRegistered=FALSE; Qg[/%$x.
bTray=FALSE; bS"fkf9
//}}AFX_DATA_INIT Htgx`N|
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 2VE9}%i
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); f'VX Y-
} i-6F:\;
qCqFy#Ms\
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |(q9"
{ -2 A(5B9Fq
CDialog::DoDataExchange(pDX); _;UE9S%
//{{AFX_DATA_MAP(CCaptureDlg) \3S8 62B7
DDX_Control(pDX, IDC_KEY, m_Key); lS'-xEv?
DDX_Check(pDX, IDC_CONTROL, m_bControl); al9t^
DDX_Check(pDX, IDC_ALT, m_bAlt); NH<5*I/
DDX_Check(pDX, IDC_SHIFT, m_bShift); _q{c##Kf
DDX_Text(pDX, IDC_PATH, m_Path); Ko&>C_N
DDX_Text(pDX, IDC_NUMBER, m_Number); =yyp?WmC8
//}}AFX_DATA_MAP Bb}fj28
} A3iFI9Iv
}`,t$NV`
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &qr;IL7'
//{{AFX_MSG_MAP(CCaptureDlg) ML8<4o
ON_WM_SYSCOMMAND() H
s"HID
ON_WM_PAINT() m/y2WlcRx
ON_WM_QUERYDRAGICON() NwG= <U*
ON_BN_CLICKED(ID_ABOUT, OnAbout) |>JS!NM
I
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Wu_kx2h
ON_BN_CLICKED(ID_CHANGE, OnChange) 9)gC6IiW
//}}AFX_MSG_MAP L G1r]2
END_MESSAGE_MAP() )Hk3A$6(
Hr]h
Jc
BOOL CCaptureDlg::OnInitDialog() nw<&3k(g}
{ iCcB@GlA
CDialog::OnInitDialog(); DFd%9*N
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); NF0%}II&xK
ASSERT(IDM_ABOUTBOX < 0xF000); o)2W`i &
CMenu* pSysMenu = GetSystemMenu(FALSE); \DD0s8
if (pSysMenu != NULL) thvYL.U:
{ {'2@(^3
CString strAboutMenu; 5_z33,q2
strAboutMenu.LoadString(IDS_ABOUTBOX);
OPx`u
if (!strAboutMenu.IsEmpty()) iIq)~e/ Z
{ vc+A RgvH+
pSysMenu->AppendMenu(MF_SEPARATOR); 8qEVOZjV&
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); vOc 9ZE
} '_/Bp4i
} fmiz,$O4?
SetIcon(m_hIcon, TRUE); // Set big icon x>* Drm 7
SetIcon(m_hIcon, FALSE); // Set small icon v!ujj5-$I
m_Key.SetCurSel(0); yz LpK;
RegisterHotkey(); JMz;BAHT
CMenu* pMenu=GetSystemMenu(FALSE); 7e#?e+5+A
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); yA.4G_|I
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); T|dY
2
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ]5$eAYq
return TRUE; // return TRUE unless you set the focus to a control H+ 0$tHi
} isZA oYVu
v(-{=*':
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) J~1r{5V4{
{ =UJ:t Sr
if ((nID & 0xFFF0) == IDM_ABOUTBOX) (v}>tb*#`
{ NX/;+{
CAboutDlg dlgAbout; kLni{IYN7
dlgAbout.DoModal(); j/nWb`#y
} R%qGPO5Z\c
else d\61;C
{ },>pDeX^P
CDialog::OnSysCommand(nID, lParam); Qkd<sxL
} qLT>Mz)$%
} 3`ELKq
v{jQek4
void CCaptureDlg::OnPaint() .Jrqm
{ ghX|3lI\q
if (IsIconic()) (''M{n
{ ~YRDyQ:%T
CPaintDC dc(this); // device context for painting Mc%Nf$XQ
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); UF<uU-C"
// Center icon in client rectangle fe_yqIdk
int cxIcon = GetSystemMetrics(SM_CXICON); $ n+w$CI)
int cyIcon = GetSystemMetrics(SM_CYICON); ]zQo>W$
CRect rect; w[!^;#
GetClientRect(&rect); gUpb4uN
int x = (rect.Width() - cxIcon + 1) / 2; #z2rzM@/:
int y = (rect.Height() - cyIcon + 1) / 2; IuOgxm~Y
// Draw the icon p Wt)
A
dc.DrawIcon(x, y, m_hIcon); ;+<&8.=,)
} 1!1beR]
else &b?LP]
{ `(f!*Ru@/z
CDialog::OnPaint(); sM?MLB\Za
} %T)oCjM[\
} kWe{r5C7
u\LFlX0sO
HCURSOR CCaptureDlg::OnQueryDragIcon() q|v(Edt|_[
{ ]"1`+q6i
return (HCURSOR) m_hIcon; I-WhH>9
} 0em#-*|2"
YR>B_,Gl
void CCaptureDlg::OnCancel() B,K>rCZ/
{ FcRW;e8-
if(bTray) _jNj-)RB_
DeleteIcon(); v}tag#f5>?
CDialog::OnCancel(); +AHUp)
} W0k0$\iX
<0QH<4
void CCaptureDlg::OnAbout() =ZDAeVz3w
{ sm\f0P!rv
CAboutDlg dlg; <oWB0%
dlg.DoModal(); q@@T]V6
} 6q]5Es<
72X0Tq 4
void CCaptureDlg::OnBrowse() 0qo)."V{
{ T.We: ,{
CString str; GW$.lo1|)
BROWSEINFO bi; +[R/=$
char name[MAX_PATH]; 3$m4q`J
ZeroMemory(&bi,sizeof(BROWSEINFO)); 1\g6)|R-+
bi.hwndOwner=GetSafeHwnd(); P#_sg0oJF
bi.pszDisplayName=name; 9(5OeH6o?
bi.lpszTitle="Select folder"; C":o/;,1
bi.ulFlags=BIF_RETURNONLYFSDIRS; '^Ql]% _
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ` bdZ/*E
if(idl==NULL) .hba*dV
return; z%e8K(
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); K,w"_T
str.ReleaseBuffer(); ;w%*M}`5
m_Path=str; cFJ-Mkll
if(str.GetAt(str.GetLength()-1)!='\\') T[sDVkCbxf
m_Path+="\\"; :k3Nt5t!
UpdateData(FALSE); ;}1xn3THCn
} e89Xb;;w
]]&M@FM2z
void CCaptureDlg::SaveBmp() qWx][D"
{ (vB<%l.&
CDC dc; @E-\ J7 yh
dc.CreateDC("DISPLAY",NULL,NULL,NULL); uFLx
CBitmap bm; nIoPC[%_
int Width=GetSystemMetrics(SM_CXSCREEN); `8I&7c
int Height=GetSystemMetrics(SM_CYSCREEN); g=]u^&
bm.CreateCompatibleBitmap(&dc,Width,Height);
k0
CDC tdc; X*,%&6O*
tdc.CreateCompatibleDC(&dc); sL@U
CBitmap*pOld=tdc.SelectObject(&bm); OzQ -7|m'J
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ]Lm9^q14m
tdc.SelectObject(pOld); 7yx$Nn`(
BITMAP btm; >A<bBK#
bm.GetBitmap(&btm); v k?skN@
DWORD size=btm.bmWidthBytes*btm.bmHeight; 5i-Rglo
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); OI?K/rn
BITMAPINFOHEADER bih; ph_4q@
bih.biBitCount=btm.bmBitsPixel; LK;k'IJ
bih.biClrImportant=0; ]b= P=
bih.biClrUsed=0; g"L|n7_b
bih.biCompression=0; ylB7* >[
bih.biHeight=btm.bmHeight; m@Qt.4m%g
bih.biPlanes=1; X5`A GyX
bih.biSize=sizeof(BITMAPINFOHEADER); KMV=%o
bih.biSizeImage=size; ?qX)ihe%k
bih.biWidth=btm.bmWidth; n f.wCtf].
bih.biXPelsPerMeter=0; z9p05NFH
bih.biYPelsPerMeter=0; 24/XNSE,-
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); w,Lvt
}
static int filecount=0; OKP9CLg9
CString name; q-rB2
name.Format("pict%04d.bmp",filecount++); %rF?dvb;?
name=m_Path+name; ~\cO"(y5:O
BITMAPFILEHEADER bfh; f_imyzP
bfh.bfReserved1=bfh.bfReserved2=0; 581e+iC~<H
bfh.bfType=((WORD)('M'<< 8)|'B'); js8{]04y
bfh.bfSize=54+size; H{AMZyV0/d
bfh.bfOffBits=54; PI~1GyJr@;
CFile bf; [b/k3&O'
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ tBm_YP[
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); i:cXwQG}B
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Hzhceeh_+
bf.WriteHuge(lpData,size); e+]6OV&+
bf.Close(); m "M("%
nCount++; ncX/L[L
} <d<mvXbw_@
GlobalFreePtr(lpData); "
beQZG
if(nCount==1) +R\vgE68
m_Number.Format("%d picture captured.",nCount); sT/c_^y
else u1~9{"P*
m_Number.Format("%d pictures captured.",nCount); %\kOLE2`
UpdateData(FALSE); iajX ~kv
} L3p`
78Aa|AJU
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) UDc$"a}ds{
{ {\z({Wlb]
if(pMsg -> message == WM_KEYDOWN) &%2*Wu;
{ "&/]@)TPz
if(pMsg -> wParam == VK_ESCAPE) Qf|U0
return TRUE; nZ_v/?O
if(pMsg -> wParam == VK_RETURN) ,j?.4{rHJ
return TRUE; SR8qt z/V
} #k$)i[aI-
return CDialog::PreTranslateMessage(pMsg); X/;p-KX
} 6AP~]e 8
Cv*x2KF
G
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2iU7 0(H
{ VN'Wq7>6
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ W>=o*{(YO
SaveBmp(); M@(^AK{mU
return FALSE; K YkS9_yF
} +@Ad1fJi
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Pa^A$fy\
CMenu pop; |w*R8ro_
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); H Y ynMP
CMenu*pMenu=pop.GetSubMenu(0); g'l?~s`SB
pMenu->SetDefaultItem(ID_EXITICON); DS2)@
CPoint pt;
/q@s
GetCursorPos(&pt); G|m1.=DJm
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); W{5:'9,
if(id==ID_EXITICON) @<@SMK)
DeleteIcon(); #-Z8Z
i"44
else if(id==ID_EXIT) ]=EM@
OnCancel(); 7JDN{!jT
return FALSE; ]O`
{dnP
} M0'
a9.d
LRESULT res= CDialog::WindowProc(message, wParam, lParam); G\;}w
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) QI!F6pGF
AddIcon(); r{seb E\
;
return res; @[6,6:h|
} ,zQOZ'^
aZk&`Jpz
void CCaptureDlg::AddIcon() y#<MVH
{ H2r8,|XL
NOTIFYICONDATA data; @-)tM.8~
data.cbSize=sizeof(NOTIFYICONDATA); DOQc"+
CString tip; !>(RK"KWq]
tip.LoadString(IDS_ICONTIP); OI0B:()
data.hIcon=GetIcon(0); @+Y8*Rj\3
data.hWnd=GetSafeHwnd(); =9G;PVk|
strcpy(data.szTip,tip); -.<k~71
data.uCallbackMessage=IDM_SHELL; f&x0@Q/eON
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; T}D<Sc
data.uID=98; U{ ;l0 2S
Shell_NotifyIcon(NIM_ADD,&data); rxO2js
ShowWindow(SW_HIDE); AY SSa 1}
bTray=TRUE; +<.\5+
} -#29xRPk
w#
*1 /N
void CCaptureDlg::DeleteIcon() %@R~DBS
{ e#/kNHl
NOTIFYICONDATA data; *8ExRQZ$
data.cbSize=sizeof(NOTIFYICONDATA); `*\{.;,]#
data.hWnd=GetSafeHwnd(); .9|uQEL
data.uID=98; 3_`szl-
Shell_NotifyIcon(NIM_DELETE,&data); j}+5vB|0
ShowWindow(SW_SHOW); (X6sSO
SetForegroundWindow(); ~JuKV&&}K
ShowWindow(SW_SHOWNORMAL); _ jAo:K_Z
bTray=FALSE; =C
f(B<u
} nN3$\gHp8i
[ut#:1h^
void CCaptureDlg::OnChange() Ze!92g
{ ~ ~8rI[/
RegisterHotkey(); `!G7k
} ^ie^VY($
5M23/=
N
BOOL CCaptureDlg::RegisterHotkey() cgj.e
{ s(&;q4|
UpdateData(); S*)o)34U
UCHAR mask=0; l#@&~f[
UCHAR key=0; p8, 0lo
if(m_bControl) n+D#k 8{
mask|=4; qUf)j\7"Fn
if(m_bAlt) Z0fJ9HW
mask|=2; L|^o71t|
if(m_bShift) DI&MC9j(
mask|=1; YCw('i(|
key=Key_Table[m_Key.GetCurSel()]; D22Lu;E
if(bRegistered){ q2_`v5t
DeleteHotkey(GetSafeHwnd(),cKey,cMask); t]^_l$
bRegistered=FALSE; ,fnsE^}.U
} RP(/x+V
cMask=mask; ewB!IJxh
cKey=key; 8,o17}NY,
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3AlqBXE"Z<
return bRegistered; MFg'YA2/
} C%ytkzG_
V+w u
四、小结 hkW{88
qSQ@p\O~
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。