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:
nYmf(DV
Zb12:? 一、实现方法
eV@4VxaZ g|_HcaW 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:
z7D*z8,i OaX HJ^k #pragma data_seg("shareddata")
(jD'+ "? HHOOK hHook =NULL; //钩子句柄
zZS>+O UINT nHookCount =0; //挂接的程序数目
u<BHf@AI static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
ay!6T`U` static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
<L[T'ZE+ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
yBUZVqqDa static int KeyCount =0;
HQ ELK static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Q"x`+?! #pragma data_seg()
L{+&z7M 0(Yh~{ 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。
oAIY=z )*q7pO\cty 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:
&<\4q IBn'iE[> BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
B<vvsp\X cKey,UCHAR cMask)
!Qj)tS#Az {
OqAh4qa,$ BOOL bAdded=FALSE;
m70`{-O for(int index=0;index<MAX_KEY;index++){
hg<"Yg= if(hCallWnd[index]==0){
yf0vR%,\ hCallWnd[index]=hWnd;
E#IiyZ HotKey[index]=cKey;
N>W;0u! HotKeyMask[index]=cMask;
4i ~eTb bAdded=TRUE;
xg*\j)_} KeyCount++;
~z-?rW break;
v
Ie=wf~D` }
__oY:d(~ }
-N /8Ho return bAdded;
}.fZy&_
}
GqmDDL1 //删除热键
N2+mN0k; BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
bUY:XmA {
,)B~cic'u BOOL bRemoved=FALSE;
{ziYd;Ys1 for(int index=0;index<MAX_KEY;index++){
e
_SoM!; if(hCallWnd[index]==hWnd){
"u3fs2 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
WcV\kemf hCallWnd[index]=NULL;
A1#4nkkc9 HotKey[index]=0;
[RGC!}"mr HotKeyMask[index]=0;
e>ZbZy? bRemoved=TRUE;
E-5ij,bHv3 KeyCount--;
W07-JHV% break;
AaCnTRG }
8gu'dG = }
02]8|B(E90 }
&sr:\Qn X/ return bRemoved;
y{&{=1# }
5p#o1I iZDb.9@&t 8M".o n DLL中的钩子函数如下:
ue^?/{OuT @M1yBN LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
&Cx yP_ {
(FjsN5 BOOL bProcessed=FALSE;
14@q $}sf if(HC_ACTION==nCode)
L~?,6 {
8S[<[CH if((lParam&0xc0000000)==0xc0000000){// 有键松开
)sY$\^'WY switch(wParam)
9^b7jw {
e$p1Th*|]4 case VK_MENU:
Sh~ 8jEk MaskBits&=~ALTBIT;
$w";*">:0 break;
1%]{0P0?[ case VK_CONTROL:
}5fI*v MaskBits&=~CTRLBIT;
)Bm^aMVl3 break;
j:de}!wc case VK_SHIFT:
it/C y\f MaskBits&=~SHIFTBIT;
]XpU'/h>q; break;
H$=h- default: //judge the key and send message
pDq^W@Rq break;
0s+rd& }
8`rAE_n`% for(int index=0;index<MAX_KEY;index++){
)M|O;~q if(hCallWnd[index]==NULL)
$z`cMQ r continue;
fed[^wW if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`0n 7Cyed {
b& _i/n( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
~PH1|h6 bProcessed=TRUE;
VfE^g\Ia }
7Dx .; }
Bcd0 }
Hjo:;s else if((lParam&0xc000ffff)==1){ //有键按下
RJ`/qXL switch(wParam)
^~YmLI4 {
7y)|^4X2 case VK_MENU:
tswG"1R MaskBits|=ALTBIT;
mXN1b! break;
6"rFfdns case VK_CONTROL:
wZ\e3H z MaskBits|=CTRLBIT;
,Rr&. break;
}ii]cY case VK_SHIFT:
=vqE=:X6 MaskBits|=SHIFTBIT;
&s6(3k break;
:+Z>nHe default: //judge the key and send message
=Y=^]ayO/ break;
46.q anh }
[<3Q$*Ew for(int index=0;index<MAX_KEY;index++){
EiIFVP if(hCallWnd[index]==NULL)
[&]YVn>kj continue;
0F;(_2V- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
t6,M {
m;tY(kO SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
7Hr4yh[j& bProcessed=TRUE;
Jz:W-o }
gYH:EuY, }
vI:bl~ }
=-1^K if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
5sV/N] ! for(int index=0;index<MAX_KEY;index++){
(>Q9jNW if(hCallWnd[index]==NULL)
6Kv}2M')+ continue;
Q+%m+ /Zq if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
~1wdAq`'a SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
GO:1
Z?^ //lParam的意义可看MSDN中WM_KEYDOWN部分
J?,!1V= }
5)SZd) }
n9-q5X^e> }
Pi]s<3PL return CallNextHookEx( hHook, nCode, wParam, lParam );
J!^~KN6[ }
scPq\Qd?O ,*}g
r 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:
w$_'xX( E*!zJ,@8 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
77=y!SDP BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
C6=;(=?C efAahH 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
XtH_+W+O n-| i LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
8Q)mmkI\= {
da86Jj=k if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
K&a]pL6D {
F#37Qv //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
*mhw5Z=!
SaveBmp();
5)zh@aJ@ return FALSE;
.]P;fCQmM }
|EEz>ci …… //其它处理及默认处理
S
bqM=I+ }
'>WuukC YvP"W/5 Qmc;s{-r; 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
.Mft+," `\u),$ 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。
m=y,_Pz>U z1KC$~{O 二、编程步骤
u{lDof> z?) RF[ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
*$Wx*Jo $X\`
7`v 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
63dtO{:4 #?|1~HC 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
@aPu}Hi n~>CE"q 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
ws(}K+y_ +nyN+X34B 5、 添加代码,编译运行程序。
][K8\ &8YI)G% 三、程序代码
U@t?jTMBkO VEYKrZA ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
tS/APSY #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
SIBIh- L #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
[,?A$Z*Z| #if _MSC_VER > 1000
f+88R=-u6S #pragma once
K}*p(1$u #endif // _MSC_VER > 1000
k-PRV8WO #ifndef __AFXWIN_H__
T+`GOFx #error include 'stdafx.h' before including this file for PCH
ppo$&W
&z #endif
H=SMDj)s+ #include "resource.h" // main symbols
:x5o3xE class CHookApp : public CWinApp
wTuRo
J {
bFdg'_ public:
.+~kJ0~Y CHookApp();
\U => // Overrides
28qWC~/9 // ClassWizard generated virtual function overrides
8 P y_Y> //{{AFX_VIRTUAL(CHookApp)
ghd[G} public:
nsw8[pk virtual BOOL InitInstance();
L5|;VH virtual int ExitInstance();
SE-, 1p //}}AFX_VIRTUAL
K~~*M?.Z //{{AFX_MSG(CHookApp)
cw-JGqLx // NOTE - the ClassWizard will add and remove member functions here.
ia.B@u1/ // DO NOT EDIT what you see in these blocks of generated code !
[&}<!:9' //}}AFX_MSG
;%.k}R%O@ DECLARE_MESSAGE_MAP()
|q b92|? };
?|rw=% LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Gg,k BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
,7nb;$] BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
*E q7r>[ BOOL InitHotkey();
3K]0sr BOOL UnInit();
G/;aZ #endif
zgOwSg8 .xQ'^P_q //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
M@ZpgAfq #include "stdafx.h"
<T~fh>a #include "hook.h"
jl%eO. #include <windowsx.h>
1UWgOCc #ifdef _DEBUG
X1QZEl #define new DEBUG_NEW
k#G7`dJl #undef THIS_FILE
48*pKbbM4 static char THIS_FILE[] = __FILE__;
QL!+.y% #endif
;xC~{O #define MAX_KEY 100
6D]G*gwk[ #define CTRLBIT 0x04
/faP]J) #define ALTBIT 0x02
t-m,~Io W #define SHIFTBIT 0x01
&zDFf9w2{ #pragma data_seg("shareddata")
Pb&+(j HHOOK hHook =NULL;
Jy
NY * UINT nHookCount =0;
Z 2jMBe static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
-.3k
vL static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
D_kzR static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
XQ y|t"Vq> static int KeyCount =0;
on&=%tCAL static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
*wyLX9{: #pragma data_seg()
[4yQbqe; HINSTANCE hins;
#EK8Qe_ void VerifyWindow();
Mp}NUQHE BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Fd.d( //{{AFX_MSG_MAP(CHookApp)
PS;*N8 // NOTE - the ClassWizard will add and remove mapping macros here.
| (9FV^_ // DO NOT EDIT what you see in these blocks of generated code!
$ aBSr1 //}}AFX_MSG_MAP
6HQwL\r79 END_MESSAGE_MAP()
A{T@O5ucj m|gd9m$,? CHookApp::CHookApp()
D??/=`|8 {
RLX^'g+P // TODO: add construction code here,
;XuEMq,Di // Place all significant initialization in InitInstance
#u(,#(P'# }
AdW7 vn Pu*UZcXY CHookApp theApp;
|W];v@b\y LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
eV}Tx;1|} {
LMj'?SuH BOOL bProcessed=FALSE;
nECf2>Yp v if(HC_ACTION==nCode)
;P#*R3
{
t O;W?g if((lParam&0xc0000000)==0xc0000000){// Key up
ofv
1G=P switch(wParam)
PX/0 jv {
?2>v5p case VK_MENU:
5!p'n#_ MaskBits&=~ALTBIT;
H5t`E^E break;
I"?&X4%e case VK_CONTROL:
>&z+ih MaskBits&=~CTRLBIT;
(19<8a9G break;
u6d~d\ case VK_SHIFT:
}f*S 9V MaskBits&=~SHIFTBIT;
XmR5dLc8 break;
<Wq{ V;$ default: //judge the key and send message
/hR]aw break;
o:*iT=l }
ixpG[8s for(int index=0;index<MAX_KEY;index++){
mSeNM if(hCallWnd[index]==NULL)
2 -8:qmP( continue;
fbkjK`_q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
P#oV ^ {
{Oszq(A SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
@b({QM| bProcessed=TRUE;
Q(7l<z }
xK 'IsMo[ }
2a-hf|b1 }
5aQg^f%\ else if((lParam&0xc000ffff)==1){ //Key down
yt,;^o^ switch(wParam)
W}3vY] {
feHAZ.8rp+ case VK_MENU:
)uWNN" MaskBits|=ALTBIT;
3f8Z?[Bb@ break;
`vBa.)u case VK_CONTROL:
i|'t!3I^m MaskBits|=CTRLBIT;
pSUp"wch break;
ZK*aVYnu case VK_SHIFT:
[)u{ - MaskBits|=SHIFTBIT;
:E*U*#h/ break;
NWj@iyi< default: //judge the key and send message
C
=U4|h ~W break;
CgE5;O }
$Bb/GXn{\ for(int index=0;index<MAX_KEY;index++)
(DAJ(r~ {
4f,x@:Jw if(hCallWnd[index]==NULL)
PCjY,O continue;
EV$n>. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
"KwKO8f {
GrC")Z|3u SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
7C^ nk
z bProcessed=TRUE;
UlytxWkUX }
>^N:A }
`$- Ib^ }
)FPbE^s( if(!bProcessed){
d5hE!= for(int index=0;index<MAX_KEY;index++){
s ~G{-)* if(hCallWnd[index]==NULL)
k=_@1b- continue;
W -&5
v if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
_Oq\YQb v SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
~V)E:( }
;_\P;s }
HbVLL`06* }
V;(LeuDH| return CallNextHookEx( hHook, nCode, wParam, lParam );
JK^;-& }
Y1IlH8+0 |&vuK9q BOOL InitHotkey()
o5R40[" {
nrBitu, if(hHook!=NULL){
<X*8Xzmv nHookCount++;
:DJ@HY return TRUE;
w4a7c }
v(~m!8!TI else
*E'K{?-K hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
-^DB?j+ if(hHook!=NULL)
UtN>6$u
nHookCount++;
Y[4B{ return (hHook!=NULL);
ow"Xv }
RUKSGj_NJ BOOL UnInit()
FO$Tn+\ 6 {
-&}E:zoe
if(nHookCount>1){
OFv} jT nHookCount--;
Q2Rj0E` return TRUE;
) /'s&
D }
^cm^JyS) BOOL unhooked = UnhookWindowsHookEx(hHook);
HxaUVg0 if(unhooked==TRUE){
z^.0eP8\j nHookCount=0;
M-Bw9`#Jw hHook=NULL;
~JpUO~i/ }
_!7o return unhooked;
|sz9l/,lG }
(i8t^ .>n|#XK BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
bE~lc}% {
stPCw$@ BOOL bAdded=FALSE;
@AOiZOH for(int index=0;index<MAX_KEY;index++){
oV`sCr5% if(hCallWnd[index]==0){
\Z':hw hCallWnd[index]=hWnd;
se[};t: HotKey[index]=cKey;
m@YLZ HotKeyMask[index]=cMask;
r;z A ` bAdded=TRUE;
"RLb wm~ KeyCount++;
-wB AFr break;
o*_ D }
5mU_S\)4:z }
^> fs return bAdded;
Q1z04m1_y[ }
yhaYlYv[_3 c+=&5=i[3 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
WmA578|l! {
{Y Ymt!Ic BOOL bRemoved=FALSE;
+zsya4r for(int index=0;index<MAX_KEY;index++){
$]FWpr%) if(hCallWnd[index]==hWnd){
n9fk{"y'G if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
MXb(Z9)]kw hCallWnd[index]=NULL;
|k+^D : HotKey[index]=0;
x<(h9tB HotKeyMask[index]=0;
JN_#
[S$
bRemoved=TRUE;
o9i\[Ul KeyCount--;
GSp1,E2J break;
&^.'g{\Y }
g5)VV" }
i weP3u## }
7
<xxOY>y return bRemoved;
|Bp?"8%*l }
`c(@WK4 rzu^br9X void VerifyWindow()
;QYK {3R? {
z( wXs&z; for(int i=0;i<MAX_KEY;i++){
!r<7]nwV if(hCallWnd
!=NULL){ ^ ;a[v^&9
if(!IsWindow(hCallWnd)){ y.zQ `
hCallWnd=NULL; J}JnJV8|G
HotKey=0; 4tI~d8?pk+
HotKeyMask=0; K_i2%t3
KeyCount--; =R05H2hs
} jKzjTn9{E
} s>5 Z
} >EY0-B
} )n.peZ
P]n
'q
BOOL CHookApp::InitInstance() S~T[*Z/m
{ X6)LpMm
AFX_MANAGE_STATE(AfxGetStaticModuleState()); SpgVsz
hins=AfxGetInstanceHandle(); cnR>)9sX
InitHotkey(); -LyIu#
return CWinApp::InitInstance(); ze-iDd_y
} T1E{NgK
L" o6)N
int CHookApp::ExitInstance() ]9' \<uR
{ mIyaoIE|$
VerifyWindow(); F<$&G'% H
UnInit(); am}zOr\
return CWinApp::ExitInstance(); zy|hf<V
} >97N
$
=["GnL*!0
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [Mi~4b
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) { T.VB~C
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ?CIa)dhu
#if _MSC_VER > 1000 &~i1 @\]
#pragma once *4ID$BmO
#endif // _MSC_VER > 1000 (<h,R@:
8PQt8G.
class CCaptureDlg : public CDialog /W9=7&R0
{ <XNLeJdY
// Construction T4[eBO
public: \21!NPXH2
BOOL bTray; jzQgDed ]
BOOL bRegistered; 1n^xVk-G
BOOL RegisterHotkey(); KnuqU2<
{
UCHAR cKey; SC#
UCHAR cMask; Vh&uSi1V
void DeleteIcon(); }5K\l
void AddIcon(); iY="M _kQ_
UINT nCount; e*tOXXY1
void SaveBmp(); r<U }lK
CCaptureDlg(CWnd* pParent = NULL); // standard constructor MStaP;|
// Dialog Data ek9%Xk8
//{{AFX_DATA(CCaptureDlg) e.N#+
enum { IDD = IDD_CAPTURE_DIALOG }; ,q4 Y
N-3
CComboBox m_Key; D3]_AS&\
BOOL m_bControl; W|:WAxJ*d
BOOL m_bAlt; QZX+E
BOOL m_bShift; WDcjj1`l
CString m_Path; *`kh}
CString m_Number; !>M: G:K
//}}AFX_DATA d/MMPge3
// ClassWizard generated virtual function overrides ){v nmJJ%
//{{AFX_VIRTUAL(CCaptureDlg) -{dwLl_
public: 7*sB"_U2
virtual BOOL PreTranslateMessage(MSG* pMsg); j9%=^ZoQj
protected: {'/8{dS
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >1YJETysO
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); JH 8^ZP:d'
//}}AFX_VIRTUAL `W5f'RU
// Implementation =vR>KE
protected: kp[Jl0K5
HICON m_hIcon; jN'zNOV~
// Generated message map functions h T<v8
//{{AFX_MSG(CCaptureDlg) j*GYYEY
virtual BOOL OnInitDialog(); y&UsSS
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1'ZBtX~A
afx_msg void OnPaint(); &a V`u?'e
afx_msg HCURSOR OnQueryDragIcon(); TV} H
virtual void OnCancel(); bFcI\Q{4
afx_msg void OnAbout(); !^y'G0
afx_msg void OnBrowse(); :>|[ o&L
afx_msg void OnChange(); ).\%a
h
//}}AFX_MSG `,J\E<4J
DECLARE_MESSAGE_MAP() G3q\Z`|3h
}; u
BvN*LQ
#endif Kg56.$
2vynz,^ET
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4v;/"4)'
#include "stdafx.h" b YiaJ
#include "Capture.h" YQ]W<0(
#include "CaptureDlg.h" env]*gx+=
#include <windowsx.h> Hd
:2
#pragma comment(lib,"hook.lib") ikUG`F%W
#ifdef _DEBUG {<V{0
s%
#define new DEBUG_NEW U<zOR=_
#undef THIS_FILE ^5OR%N)
static char THIS_FILE[] = __FILE__; HN\9d
#endif 0y*8;7-|r)
#define IDM_SHELL WM_USER+1 Z<`QDBN"4
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3qP!
(*
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nBR4j?':i
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; yN9/'c~
class CAboutDlg : public CDialog Mp}U>+8
{ +d<o2n4!
public: eGjEO&$
CAboutDlg(); *5u0`k^j
// Dialog Data 'bTtdFvJ
//{{AFX_DATA(CAboutDlg) *&XOzaVU
enum { IDD = IDD_ABOUTBOX }; g/eE^o~;
//}}AFX_DATA Hi#hf"V
// ClassWizard generated virtual function overrides Tv!zqx#E
//{{AFX_VIRTUAL(CAboutDlg) P9BShC5
protected: RK< uAiU
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >HyZ~M
//}}AFX_VIRTUAL W;Ct[Y8m
// Implementation $/K<hT_
protected: ? g}G#j
//{{AFX_MSG(CAboutDlg) ,VI2dNst\
//}}AFX_MSG 6YNd;,it>p
DECLARE_MESSAGE_MAP() U&GSMjqg
}; voiWf?X
5y0N }}
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) f]Xh7m(Gh
{ UZz/v#y~
//{{AFX_DATA_INIT(CAboutDlg) `fS$@{YI_
//}}AFX_DATA_INIT zt6GJz1q
} Kqm2TMO]>V
y2KR^/LN|Y
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 7*.nd
{ ,?S1e#
CDialog::DoDataExchange(pDX); +87|gC7B
//{{AFX_DATA_MAP(CAboutDlg) ''tCtG"
Xi
//}}AFX_DATA_MAP >4
VN1^
} 8u6*;*o
Qu|H_<8g
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1aDx 6Mq
//{{AFX_MSG_MAP(CAboutDlg) 4}`z^P<C
// No message handlers Qhy!:\&1
//}}AFX_MSG_MAP )\Am:?RH;
END_MESSAGE_MAP() B 1jeIk,
-%,=%FBi~4
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) yw\Q>~$n[=
: CDialog(CCaptureDlg::IDD, pParent) {OIB/
{ E%LUJx}
//{{AFX_DATA_INIT(CCaptureDlg) .~u[rc|<
m_bControl = FALSE; #Pt_<?JtV
m_bAlt = FALSE; qz95)
m_bShift = FALSE; tnE),
m_Path = _T("c:\\"); FF #T"y0Y
m_Number = _T("0 picture captured."); k'QI`@l&l
nCount=0; IK1'" S|
bRegistered=FALSE; nvbzC tC
bTray=FALSE; 2{|Z?3FJ^
//}}AFX_DATA_INIT SMonJ;Y
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 i]9C"Kw$L
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); {^8?fJ/L
} w{mw?0
rny(8z%Ck-
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) s5h}MXIXw
{ MroN=%|t
CDialog::DoDataExchange(pDX); tTOBKA89
//{{AFX_DATA_MAP(CCaptureDlg) pmRm&VgE.
DDX_Control(pDX, IDC_KEY, m_Key); KrdEB0qh
DDX_Check(pDX, IDC_CONTROL, m_bControl); 5\V""fH
DDX_Check(pDX, IDC_ALT, m_bAlt); [4w*<({*
DDX_Check(pDX, IDC_SHIFT, m_bShift); agt/;>q\~
DDX_Text(pDX, IDC_PATH, m_Path); Hsn'"
DDX_Text(pDX, IDC_NUMBER, m_Number); C~Hhi-Xl)
//}}AFX_DATA_MAP qA0PGo
} # ~Doz7~
GXG 7P,p,
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) hi`[
//{{AFX_MSG_MAP(CCaptureDlg) 0 30LT$&!
ON_WM_SYSCOMMAND() .+A)^A
ON_WM_PAINT() _ _!LTpp
ON_WM_QUERYDRAGICON() 'Fy"|M;2
ON_BN_CLICKED(ID_ABOUT, OnAbout) (\ge7sE-oo
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ZLP/&`>8
ON_BN_CLICKED(ID_CHANGE, OnChange) tq}MzKI*
//}}AFX_MSG_MAP ClG\Kpirh
END_MESSAGE_MAP() {7jl) x3l
":0u%E?s
BOOL CCaptureDlg::OnInitDialog() 3^[P
{ =^1jVaAL
CDialog::OnInitDialog(); q
#mBNe62p
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =p^$>o
ASSERT(IDM_ABOUTBOX < 0xF000); 1w~PHH`~
CMenu* pSysMenu = GetSystemMenu(FALSE); ?Z2`8]-E
if (pSysMenu != NULL) T*:w1*:
{ !c`&L_ "!
CString strAboutMenu; ; [G:
strAboutMenu.LoadString(IDS_ABOUTBOX); A'BqNsy
if (!strAboutMenu.IsEmpty()) {n|ah{_p|
{ "AU.Eh"-1
pSysMenu->AppendMenu(MF_SEPARATOR); nNq<x^@83
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); l`.z^+!8@
} KLvAe>#,
} p[w! SR%=
SetIcon(m_hIcon, TRUE); // Set big icon LN~mKoW
SetIcon(m_hIcon, FALSE); // Set small icon ]DKRug5
m_Key.SetCurSel(0); .W^B(y(tA
RegisterHotkey(); /78]u^SW
CMenu* pMenu=GetSystemMenu(FALSE); ((C|&$@M
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); M!+J[q
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Qo)Da}uo20
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); &Ts!#OcB,
return TRUE; // return TRUE unless you set the focus to a control !m^;wkrY
} GF6 o
,A'| Z
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) b"uO BB
{ ckMG4
3i\j
if ((nID & 0xFFF0) == IDM_ABOUTBOX) \_WR:?l
{ %cLS*=MO
CAboutDlg dlgAbout; jYi,oE
dlgAbout.DoModal(); C7ug\_,s
} $2\8Rn6'
else ~5'7u-;
{ s3eS` rK-
CDialog::OnSysCommand(nID, lParam); -nXP<v=V
} (P`=9+
} :h5G|^
$m;`O_-T
void CCaptureDlg::OnPaint() b3EGtC}^
{ 'y\Je7
if (IsIconic()) ?HJh;96B
{ +l^tT&s;f
CPaintDC dc(this); // device context for painting 5CZyA`3V^5
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]Cj@",/3#
// Center icon in client rectangle ;Ax-f04gG
int cxIcon = GetSystemMetrics(SM_CXICON); \o}T0YX
int cyIcon = GetSystemMetrics(SM_CYICON); K fD.J)
CRect rect; Ly&+m+Gwu
GetClientRect(&rect); ?<${?L>
int x = (rect.Width() - cxIcon + 1) / 2; )i}j\";>L
int y = (rect.Height() - cyIcon + 1) / 2; )O" E#%
// Draw the icon Qn7T{ BW
dc.DrawIcon(x, y, m_hIcon); '{cSWa|
#
} a;t}'GQGk
else ._^}M<o L
{ 0W(mx-[H/
CDialog::OnPaint(); D3cJIVM
} o>_})WM1[
} rw,Ylr:3
uG^CyM>R`
HCURSOR CCaptureDlg::OnQueryDragIcon() ^#d\HI
{ AY{KxCrb^
return (HCURSOR) m_hIcon; *mzi ?3
} <a]i"s
q)i %*IY
void CCaptureDlg::OnCancel() ?D6uviQg
{ 6LBdTnzUd
if(bTray) Ss+F
DeleteIcon(); wkM1tKhy/
CDialog::OnCancel(); /QY F|%7!
} iqvLu{
K f/[Edn
void CCaptureDlg::OnAbout() ~.aR=m\#
{ W}f)VC;D
CAboutDlg dlg; nd]SI;<
dlg.DoModal(); qtExd~E
} C<
9x\JY%
2
^m}5:0
void CCaptureDlg::OnBrowse() 6@s!J8!
{ f^FFn32u
CString str; 7pm'b,J<
BROWSEINFO bi; m,lZy#02s3
char name[MAX_PATH]; &]DB-t#\
ZeroMemory(&bi,sizeof(BROWSEINFO)); ?qNU*d
bi.hwndOwner=GetSafeHwnd(); w}gmVJ#p
bi.pszDisplayName=name; P9/ (f$ =
bi.lpszTitle="Select folder"; ^ +SE_ -+]
bi.ulFlags=BIF_RETURNONLYFSDIRS; I.n,TJoz4J
LPITEMIDLIST idl=SHBrowseForFolder(&bi); xvV";o
if(idl==NULL) BM<q;;pO
return; 9B!Sv/)y!r
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =#2c
r:1
str.ReleaseBuffer(); ;cXw;$&D
m_Path=str; Bn7uKa{P
if(str.GetAt(str.GetLength()-1)!='\\') 6nZ]y&$G-k
m_Path+="\\"; Ipk;Nq
UpdateData(FALSE); S MWXP
} KLyRb0V
@|\9<S
void CCaptureDlg::SaveBmp() R9U{r.AA
{ 3>KEl^1DB
CDC dc; c_3B: F7
dc.CreateDC("DISPLAY",NULL,NULL,NULL); iApq!u,
CBitmap bm; &Q3Fgj
int Width=GetSystemMetrics(SM_CXSCREEN); ,AP0*Ln
int Height=GetSystemMetrics(SM_CYSCREEN); eX+36VG\
bm.CreateCompatibleBitmap(&dc,Width,Height); w*-42r3,'
CDC tdc; U?UU]>Q
tdc.CreateCompatibleDC(&dc); oX|T&"&
CBitmap*pOld=tdc.SelectObject(&bm); e9o\qEm
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); xqt?z n
tdc.SelectObject(pOld); $fmTa02q>
BITMAP btm; `,qft[1
bm.GetBitmap(&btm); (QDKw}O2b
DWORD size=btm.bmWidthBytes*btm.bmHeight; \baY+,Dr+
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ZwkUd-=0i
BITMAPINFOHEADER bih; Cz0FA]-g
bih.biBitCount=btm.bmBitsPixel; Ix- Mp
bih.biClrImportant=0; 4!IuTPmr
bih.biClrUsed=0; nGH6D2!F
bih.biCompression=0; N&HI)X2&
bih.biHeight=btm.bmHeight; >v]^nJl
bih.biPlanes=1; iH8we,s'
bih.biSize=sizeof(BITMAPINFOHEADER); N d].(_
bih.biSizeImage=size; ubwM*P
bih.biWidth=btm.bmWidth; jH<
#)R
bih.biXPelsPerMeter=0; 1&|]8=pG7
bih.biYPelsPerMeter=0; {DRk{>K,
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $aV62uNf
static int filecount=0; V|8'3=Z=
CString name; UxGu1a
name.Format("pict%04d.bmp",filecount++); (BEe^]f
name=m_Path+name; YvJFZ_faX
BITMAPFILEHEADER bfh; lq-KM8j
bfh.bfReserved1=bfh.bfReserved2=0; &t=:xVn-M
bfh.bfType=((WORD)('M'<< 8)|'B'); \ %Mcvb.?
bfh.bfSize=54+size; w"j>^#8
bfh.bfOffBits=54; |V a:*3u
CFile bf; 'Aq^z%|
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ P([!psgu
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5#GMp
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); C%z)D1-
bf.WriteHuge(lpData,size); Tqt-zX|>
bf.Close(); "w:h
nCount++; 8ymdg\I+L
} BJjic% V
GlobalFreePtr(lpData); ,"EaZ/Bl/
if(nCount==1) 2lTt
m_Number.Format("%d picture captured.",nCount); (!*
l+}
else *ERV\/
m_Number.Format("%d pictures captured.",nCount); "t0^4=c+7
UpdateData(FALSE); zjmoIE
} P~j#8cH7
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,Y:oTo=~
{ ,Kv6!ib6Q
if(pMsg -> message == WM_KEYDOWN) #
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{ 7m2iL#5[
if(pMsg -> wParam == VK_ESCAPE) 1#vu)a1+b
return TRUE; 287j,'vR
if(pMsg -> wParam == VK_RETURN) ^B<-.(F
return TRUE; 4fi4F1 f
} mkSu
$c
return CDialog::PreTranslateMessage(pMsg); A(2 0+
} 90vWqL!
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LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) T8S&9BM7
{ 1aAOT6h
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ~O}r<PQ
SaveBmp(); D_l$"35?
return FALSE; 2j-l<!s
} A%^?z.
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ctP+ECH
CMenu pop; vFUp$[
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); k-~}KlP
CMenu*pMenu=pop.GetSubMenu(0); f Fi=/}
pMenu->SetDefaultItem(ID_EXITICON); bJ:5pBJ3
CPoint pt; =Zj
7dn;EN
GetCursorPos(&pt); Ti? "Hr<W
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); m6i ,xn
if(id==ID_EXITICON) Qsbyy>o)
DeleteIcon(); QNbZ)
else if(id==ID_EXIT) Nw"df=,{
OnCancel(); ;P S4@,
return FALSE; #(tdJ<HvC|
} z4YDngf=4
LRESULT res= CDialog::WindowProc(message, wParam, lParam); N3u06
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /4;mjE
AddIcon(); y6$a:6
return res; $n<1D -0!r
} -b!?9T?}
RvR.t"8
void CCaptureDlg::AddIcon() #N][-i
{ #6M |T+=
NOTIFYICONDATA data; ^&;,n.X5Z
data.cbSize=sizeof(NOTIFYICONDATA); K@p9_K8
CString tip; ^]o
H}lwO
tip.LoadString(IDS_ICONTIP); n/v.U,f&l@
data.hIcon=GetIcon(0); q]4h#?.-1v
data.hWnd=GetSafeHwnd(); XJo.^<m
strcpy(data.szTip,tip); KpGx<+0p
data.uCallbackMessage=IDM_SHELL; ;-3&yQ7N)
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Qb
{[xmc
data.uID=98; G8}owszT
Shell_NotifyIcon(NIM_ADD,&data); - +a,Ej
ShowWindow(SW_HIDE); iQO4IT
bTray=TRUE; AWcbbj6Nd
} #x.v)S
f/dJRcDl<
void CCaptureDlg::DeleteIcon() Tgpu 9V6
{ 9wx]xg4l"
NOTIFYICONDATA data; AJ\gDjj<
data.cbSize=sizeof(NOTIFYICONDATA); Y2VfJ}%Q
data.hWnd=GetSafeHwnd(); Tf#Op
v)
data.uID=98; ?l~qb]._
Shell_NotifyIcon(NIM_DELETE,&data); :Quep-:fy<
ShowWindow(SW_SHOW); #H6YI3
`G
SetForegroundWindow(); )xVf3l
pQ
ShowWindow(SW_SHOWNORMAL); |M?s[}ll
bTray=FALSE; ,=e.QAF!"
} -3ePCAtXbe
S:z|"u:+
void CCaptureDlg::OnChange() yV`Tw"p
{ GJdL1ptc
RegisterHotkey(); u.A}&'H
} 3/gR}\=
+X#6dv$
BOOL CCaptureDlg::RegisterHotkey() m^FKE:
{ ?n#$y@U
UpdateData(); 3[Q7'\
UCHAR mask=0; E,d<F{=8,o
UCHAR key=0; 29=ob("
if(m_bControl) Fug4u?-n
mask|=4; X0L\Ewm
if(m_bAlt) o_}?aI~H
mask|=2; 6D]fDeH\
if(m_bShift) 4M%|N
mask|=1; #|T"6jJaQ
key=Key_Table[m_Key.GetCurSel()]; t;+b*S6D
if(bRegistered){ j3&q?1
DeleteHotkey(GetSafeHwnd(),cKey,cMask); "$N$:B @U
bRegistered=FALSE; jOCV)V9}
} -"zW"v)\
cMask=mask; 3rK\
f4'
cKey=key; 8GBKFNR8
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); E q4tcZ
return bRegistered; #6a!OQj
} l[~$9C'ji
@|cHDltH
四、小结 ZklO9Ox(
|*48J1:1y
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。