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:
$*a'84-5G-
/Ss7"*JLe 一、实现方法
C`jM0Q ;^Sr"v6r>u 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
(m[bWdANnW M@1r:4CoKH #pragma data_seg("shareddata")
vR6Bn HHOOK hHook =NULL; //钩子句柄
k^ F@X UINT nHookCount =0; //挂接的程序数目
2f`nMW static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
YT/kC'A static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
PYRd]%X static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
^I6^g static int KeyCount =0;
zjL.Bhiud static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
V==z" #pragma data_seg()
SHb(O<6 I:V0Xxz5t 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
;{[>&4 {4aWR>< DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
}}<Z,/O BElJB&I BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
DD9 ?V}Yx cKey,UCHAR cMask)
+y2[msBs {
gnp~OVDqfL BOOL bAdded=FALSE;
^[-el=oKn0 for(int index=0;index<MAX_KEY;index++){
;8S/6FI if(hCallWnd[index]==0){
NC qo@vE hCallWnd[index]=hWnd;
t2" (2 HotKey[index]=cKey;
!
Z`0(d HotKeyMask[index]=cMask;
l=N2lHU bAdded=TRUE;
raVA?|'g~ KeyCount++;
D0(xNhmKz break;
;;$# )b }
C${S^v }
ajRSMcKb7i return bAdded;
p Rdk>Ph }
7?gFy- //删除热键
2jsw"aHW BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
9z;HsU v {
)? M9|u BOOL bRemoved=FALSE;
|sZ! for(int index=0;index<MAX_KEY;index++){
l+][V'zL if(hCallWnd[index]==hWnd){
m@`8A if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
,B&fFis hCallWnd[index]=NULL;
I\?9+3 XnQ HotKey[index]=0;
. #Z+Z HotKeyMask[index]=0;
kc'pN&]r: bRemoved=TRUE;
Ll4bdz, KeyCount--;
C'=k<- break;
{y] mk?j }
'$As<LOEd/ }
Q(d9n8 }
rKHY?{! return bRemoved;
q{2I_[p }
}ZSQ>8a ffXyc2o }u+a<:pkK DLL中的钩子函数如下:
6<,dRn m]_FQWfet LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
1QZ&Mj^^ {
_ ~RpGX BOOL bProcessed=FALSE;
CSbI8 5F if(HC_ACTION==nCode)
.I VlEG0 {
3bqC\i^[\m if((lParam&0xc0000000)==0xc0000000){// 有键松开
m+{K^kr[ switch(wParam)
WD;Y~| {
z|7zj/+g case VK_MENU:
~m1P_`T MaskBits&=~ALTBIT;
b96%") break;
B()/.w?A case VK_CONTROL:
fW`&'! MaskBits&=~CTRLBIT;
1Kvx1p
break;
i`/+,< case VK_SHIFT:
b5m=7;u*h MaskBits&=~SHIFTBIT;
MC0TaP break;
#zrTY9m7 default: //judge the key and send message
e}@)z3Q<l break;
`6y{.$ z }
.*$OQA for(int index=0;index<MAX_KEY;index++){
;n=. {[, if(hCallWnd[index]==NULL)
~'5 continue;
Uw-p758dD if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
hqk}akXt {
LAx4Xp/ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
1iL'V-y bProcessed=TRUE;
0w'j+ }
Et"?8\"n7 }
T&T/C@z'R }
58%'UwKn else if((lParam&0xc000ffff)==1){ //有键按下
?6c-7QV switch(wParam)
j7FN\
cz {
G5dO 3lwq case VK_MENU:
q(5j(G ; MaskBits|=ALTBIT;
O=) break;
H$ftGwS8 case VK_CONTROL:
~`>e5OgOJ MaskBits|=CTRLBIT;
/2{5; break;
.yT8NTu~0j case VK_SHIFT:
mD:IO MaskBits|=SHIFTBIT;
FtufuL?JS break;
a"/#+=[ default: //judge the key and send message
[md u!!* break;
]maYUKqv}' }
5#3W5z for(int index=0;index<MAX_KEY;index++){
I~,G if(hCallWnd[index]==NULL)
Vh3Ijn continue;
w(L>#? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*xf ._~E {
6b8;}],| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
EzW)'Zzw~ bProcessed=TRUE;
TGuiNobD }
V~GWl1#7 }
1%M&CX }
b1pQ`qt if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
CV$],BM for(int index=0;index<MAX_KEY;index++){
at!Y3VywG if(hCallWnd[index]==NULL)
l?Y_~Wuw continue;
^^i6|l1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
*?QE2&S: SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
3QI?[R. //lParam的意义可看MSDN中WM_KEYDOWN部分
%xwIt~Y }
)Fd
HV;K }
WWwUwUi }
a/~aFmu6b return CallNextHookEx( hHook, nCode, wParam, lParam );
rzrl>9
h }
E'1+ Yq {)- .xG 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
[w
-{r+[ oMcK`%ydm BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
gADmN8G= BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
.*=]gZ$IE NT%W;)6m9 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:
:J}t&t M-NV_W&M LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
<1w/hy&mWN {
C0.'_ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
eZ a:o1y {
qLncn}oNM //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
%zC[KE*~ SaveBmp();
SgMrce<; return FALSE;
HQ9f ,< }
@RD+xYm …… //其它处理及默认处理
#5sD{:f` }
bLz*A- kH*P n' 3`hUo5K 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。
>idBS ezhDcI_T 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。
[MX;,%;; ^/wfXm 二、编程步骤
[#" =yzR<3 *y`%]Hy< 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";
j^`X~gE F}J-gZl 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
/9Q3iV$I] nM=e]qH 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
Y**|N8e QH4wUU3X 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
a\kb^D=T HQ!Xj.y 5、 添加代码,编译运行程序。
puSLqouTM fQWIw 三、程序代码
B;Nl~Y| \ ^Yr0@pE ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
TAL/a*7\ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
vv6$>SU #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
[\)oo #if _MSC_VER > 1000
y<W8Q<9 #pragma once
kI*(V[i #endif // _MSC_VER > 1000
*VSel4;\t #ifndef __AFXWIN_H__
3zuF{Q2P< #error include 'stdafx.h' before including this file for PCH
@e~]t}fH #endif
OwzJO #include "resource.h" // main symbols
lJykyyCY+ class CHookApp : public CWinApp
,O=a*%0rt {
\8uo{#cL8 public:
KH KS$D CHookApp();
q^8EOAvnZ // Overrides
k1z$e*u&r // ClassWizard generated virtual function overrides
XA0(f* //{{AFX_VIRTUAL(CHookApp)
0X..e$ ' public:
oC*ees
g_ virtual BOOL InitInstance();
L^kp8o^$ virtual int ExitInstance();
+5<k-0v //}}AFX_VIRTUAL
NW$H"}+o //{{AFX_MSG(CHookApp)
WV;=@v // NOTE - the ClassWizard will add and remove member functions here.
P#kGX(G9! // DO NOT EDIT what you see in these blocks of generated code !
D| I Ec? //}}AFX_MSG
vY6W|<s DECLARE_MESSAGE_MAP()
wbbqt0un };
hRaf# LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
l2v_?j-)x BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
{TSY|D2 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
pvWau1ArNq BOOL InitHotkey();
Hyk'c't_O BOOL UnInit();
5G}6;U Y #endif
!.-tW7 ]>##`X //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
&'|B =7 #include "stdafx.h"
h4&;?T S #include "hook.h"
:2V^K&2L #include <windowsx.h>
hSqY$P #ifdef _DEBUG
{B$2"q/~ #define new DEBUG_NEW
:@
uIxa$[ #undef THIS_FILE
L/}iy} static char THIS_FILE[] = __FILE__;
XY7Qa!>7j #endif
W@L3+4 #define MAX_KEY 100
6@;ha=[+ #define CTRLBIT 0x04
TDK@)mP #define ALTBIT 0x02
1ZJ4*b n #define SHIFTBIT 0x01
(Ha@s^?.C #pragma data_seg("shareddata")
zbw7U'jk HHOOK hHook =NULL;
! U0z" UINT nHookCount =0;
qX:B4,|ck static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
0V,Nv9!S static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
)yee2(S
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
`qpc*enf0 static int KeyCount =0;
MKGS`X]<J static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
={(j`VSUX0 #pragma data_seg()
-Q
e~)7 HINSTANCE hins;
$FM'
3%B[ void VerifyWindow();
;~ 4k7Uz BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
jjOgG-Q //{{AFX_MSG_MAP(CHookApp)
jdRq6U^ // NOTE - the ClassWizard will add and remove mapping macros here.
aA*9, // DO NOT EDIT what you see in these blocks of generated code!
dFW=9ru+MQ //}}AFX_MSG_MAP
>}+Q:iNQ)2 END_MESSAGE_MAP()
a^nAZ hAR?
t5c CHookApp::CHookApp()
8 ,}ikOZ? {
0O@_cW // TODO: add construction code here,
y+mElG$F // Place all significant initialization in InitInstance
kka"C]! }
7 &)])
{Q >O{7/)gS^ CHookApp theApp;
M.%shrJ/ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
^t.W|teD {
F%.xuL W BOOL bProcessed=FALSE;
{gF0Xm% if(HC_ACTION==nCode)
<dR,' {
ND]S(C"? if((lParam&0xc0000000)==0xc0000000){// Key up
"Tbnxx]J switch(wParam)
=WZ%H_oxi {
6k0^ x Q case VK_MENU:
a_T,t'6 MaskBits&=~ALTBIT;
vS;'}N break;
Y)HbxFF`/ case VK_CONTROL:
B+VuUt{S MaskBits&=~CTRLBIT;
tiQ;#p7% break;
<HoAj"xf case VK_SHIFT:
q|#MB7e/ MaskBits&=~SHIFTBIT;
?qHF}k| break;
eMMx8E)B default: //judge the key and send message
LVtu*k break;
9Ld9N;rWm# }
cf8-]G?tK for(int index=0;index<MAX_KEY;index++){
h* .w"JO if(hCallWnd[index]==NULL)
GG-[`!>.pw continue;
O&?.&h if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
W|c.l{A5Q {
gp SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
#!#z5DJu bProcessed=TRUE;
"e62/Ejg% }
9BON.` |_ }
1$LI px }
<!x+eE` else if((lParam&0xc000ffff)==1){ //Key down
hb^!LtF#Y switch(wParam)
xxX/y2\ {
[B/0-(? case VK_MENU:
# mT]j"" MaskBits|=ALTBIT;
jz:gr=*z break;
a8uYs DS case VK_CONTROL:
o" _=K%9 MaskBits|=CTRLBIT;
qc8Ta" break;
7[o {9Yp& case VK_SHIFT:
SE `l(-tL MaskBits|=SHIFTBIT;
(O5)wej break;
E20&hc5 8 default: //judge the key and send message
ia{kab|_5 break;
9;f|EGwZ }
:EHQ .^ for(int index=0;index<MAX_KEY;index++)
ZlR!s!vv {
Aka^e\Y@6* if(hCallWnd[index]==NULL)
'Ji+c continue;
2w1tK if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
4,}GyVJFb` {
jMU9{Si SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
I-:`cON=G bProcessed=TRUE;
Vewzo1G2 }
EF;,Gjh5p }
pMN<p[MB }
UC!5
wVY if(!bProcessed){
S<oQ}+4[~ for(int index=0;index<MAX_KEY;index++){
iHz[Zw^.s if(hCallWnd[index]==NULL)
@>O&Cpt continue;
v]bAWo if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
rx:lKoOnB SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
]h@{6N'oNS }
KOSyh<& }
,P@QxnQ }
R;THA! return CallNextHookEx( hHook, nCode, wParam, lParam );
YNM\pX' }
8~5|KO >F oh&Y<d0 BOOL InitHotkey()
?)cJZ>$!w {
,L%p if(hHook!=NULL){
R<g =\XO'y nHookCount++;
QkX@QQT? return TRUE;
Kym:J \}9B }
u2lmwE else
37>MJ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
3
jh|y, if(hHook!=NULL)
ay[+2" nHookCount++;
k,]{NO
return (hHook!=NULL);
s/S+ ec3 }
Ekf2NT BOOL UnInit()
;D&wh {
cEi<}9r if(nHookCount>1){
? ).(fP nHookCount--;
dofR)"<p,^ return TRUE;
Mf7E72{D }
>sV Bj(f BOOL unhooked = UnhookWindowsHookEx(hHook);
VRhRwdC if(unhooked==TRUE){
8|<f8Z65! nHookCount=0;
P%!q1`Eke( hHook=NULL;
)dg UmN }
0*{p Oe/u return unhooked;
lt%-m@#/ }
wea\8[U3" '%O\E{h BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
J~2CD*v {
r %xB8e9 BOOL bAdded=FALSE;
j?J=w=.Nx for(int index=0;index<MAX_KEY;index++){
~%G Ssm\J if(hCallWnd[index]==0){
*]9XDc]{j1 hCallWnd[index]=hWnd;
4`0;^K. HotKey[index]=cKey;
+-k`x0v HotKeyMask[index]=cMask;
:eLLDp< bAdded=TRUE;
2o}8W7y KeyCount++;
}q x(z^ break;
D4\(:kF\Hg }
p,^>*/O> }
dh,7iQ
s return bAdded;
~$ WQ"~z }
|
VRq$^g 1
'%-y BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
_^3@PM> {
A?V<l<EAm BOOL bRemoved=FALSE;
|vN$"mp^a for(int index=0;index<MAX_KEY;index++){
"j;!_v>=f` if(hCallWnd[index]==hWnd){
73#9NZR if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
A>y#}^l] hCallWnd[index]=NULL;
/
GZV_H%v HotKey[index]=0;
:O#gJob-%s HotKeyMask[index]=0;
OAyE/Q| bRemoved=TRUE;
?(M\:`G' KeyCount--;
n]Ebwznt- break;
6P6Jx; }
k dUc& }
QD6Z=>?S }
PE +qYCpP9 return bRemoved;
)%1&/uN) }
M{y|7e%K zkvH=wL void VerifyWindow()
m
R"9&wq {
2fbvU for(int i=0;i<MAX_KEY;i++){
LDSbd,GF if(hCallWnd
!=NULL){ yl|R:/2V
if(!IsWindow(hCallWnd)){ $M%}Oz3*
hCallWnd=NULL; r]Z.`}Kkm
HotKey=0; 34^Q5B~^J
HotKeyMask=0; lK 9s0t'
KeyCount--; U@MOvW)
} fG^7@Jw:G
} I[vME"
} 7jD@Gp`" 3
} F\l!A'Q+t
ZlUFJ*pk
BOOL CHookApp::InitInstance() I\)N\move
{ ook' u}h
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8Na}Wp;|Gi
hins=AfxGetInstanceHandle(); <:H
InitHotkey(); X@G[=Rs
return CWinApp::InitInstance(); ZO]E@?Oav
} )E_!rR
_p?I{1O
int CHookApp::ExitInstance() 3<yCe%I:
{ ggzAU6J
VerifyWindow(); P'KY.TjWb
UnInit(); vsxvHot=
return CWinApp::ExitInstance(); _y.mpX&
} Ni/|C19Z
jAsh
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file vQE` c@^{
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) GWVEIZ
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ (p}9^Y
#if _MSC_VER > 1000 :a#|
#pragma once #zh6=.,7
#endif // _MSC_VER > 1000 |2tSUOZ
kvY}
yw7
class CCaptureDlg : public CDialog :ga 9Db9P
{ ;g!xQvcR
// Construction 8Fyc#Xo8
public: |v,}%UN2
BOOL bTray; $v2S;UB v*
BOOL bRegistered; 99=[>Ck)G
BOOL RegisterHotkey(); \Or]5ogT'
UCHAR cKey; 6uv'r;U]
UCHAR cMask; X:iG[iU*
void DeleteIcon(); %l0_PhAB
void AddIcon(); Z%(Df3~gmm
UINT nCount; OD>u$tI9
void SaveBmp(); BIwgl@t!>
CCaptureDlg(CWnd* pParent = NULL); // standard constructor lU>)n
// Dialog Data ci#Zvhtkr
//{{AFX_DATA(CCaptureDlg) 0EF,uRb
enum { IDD = IDD_CAPTURE_DIALOG }; S8rW'}XJ=H
CComboBox m_Key; 89?3,k
BOOL m_bControl; S+4I[|T]Y
BOOL m_bAlt; Ta!m%=8
BOOL m_bShift;
}j]<&I}
CString m_Path; $NH`Iu9t
CString m_Number; 0YgFjd
5
//}}AFX_DATA 50O7=
// ClassWizard generated virtual function overrides ([z<TS#Md
//{{AFX_VIRTUAL(CCaptureDlg) H"kc^G+(R"
public: O#<|[Dzw
virtual BOOL PreTranslateMessage(MSG* pMsg); _oYA;O
protected: +Px<DX+
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support LL6ON
}
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )4 VLm
//}}AFX_VIRTUAL [U_Q 2<H
// Implementation ?}!gLp
protected: e\+~
HICON m_hIcon; wt3Z?Pb
// Generated message map functions T/X?ZK(T
//{{AFX_MSG(CCaptureDlg) I3F6-gH
virtual BOOL OnInitDialog(); 6jQ&dN{=qB
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ;+#za?w
afx_msg void OnPaint(); M,=@|U/B
afx_msg HCURSOR OnQueryDragIcon(); 4OB~h]Vc
virtual void OnCancel(); y"%iD`{
afx_msg void OnAbout();
QmDhZ04f
afx_msg void OnBrowse(); QZz{74]n
afx_msg void OnChange(); TWD|1
di0
//}}AFX_MSG /;]B1T7
DECLARE_MESSAGE_MAP() JCQx8;V%I
}; >"m@qkh
#endif bHlD m~5
-X6\[I:+A
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file V8| q"UX
#include "stdafx.h" 3 z{5c
#include "Capture.h" &,6y(-
#include "CaptureDlg.h" t8a@L(J$
#include <windowsx.h> %^)Ja EUC
#pragma comment(lib,"hook.lib") nOL 25 Y:
#ifdef _DEBUG ._F6- pl
#define new DEBUG_NEW ft.}$8vIT
#undef THIS_FILE ~L Bq5a
static char THIS_FILE[] = __FILE__; )e <! =S
#endif r5fz6"
#define IDM_SHELL WM_USER+1 eO[Cb]Dy:
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bo?3E +B
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]CtoK%k
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; e-duZ o
class CAboutDlg : public CDialog DftGy:Ah3
{ Q'%5"&XFD
public: J7 zVi
CAboutDlg(); nP3;<*T P0
// Dialog Data /d]V{I~6
//{{AFX_DATA(CAboutDlg) bl!f5RO S(
enum { IDD = IDD_ABOUTBOX }; GhfUCW%
//}}AFX_DATA N4JqW
// ClassWizard generated virtual function overrides Q,`2DHhK
//{{AFX_VIRTUAL(CAboutDlg) v1tN
DyM6
protected: 0;m$a=
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support y9l.i@-
//}}AFX_VIRTUAL ky
lr f4=
// Implementation qyG636i
protected: e8ig[:B>+
//{{AFX_MSG(CAboutDlg) u^4 "96aXJ
//}}AFX_MSG 8BoT%kVeJv
DECLARE_MESSAGE_MAP() 6XxG1]84
}; &j~|3
.]sIoB-54
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :\w[xqH
{ 7AFS)_w
//{{AFX_DATA_INIT(CAboutDlg) R*TGn_J`
//}}AFX_DATA_INIT 35]G_\
} >cr_^(UW&
zL!~,B8C
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (gJ
)]/n
{ .8uwg@yD
CDialog::DoDataExchange(pDX); Dy!bj
//{{AFX_DATA_MAP(CAboutDlg) 5}l#zj
//}}AFX_DATA_MAP 7)6Yfa]I%
} lVp~oZC6[
h9OL%n 7m'
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0)] C&;}_M
//{{AFX_MSG_MAP(CAboutDlg) E(4lu%
// No message handlers ^*UfCoj9Z
//}}AFX_MSG_MAP W$VCST
END_MESSAGE_MAP() ]OCJ~Zw
-L4G WJ~.-
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %F]9^C+
: CDialog(CCaptureDlg::IDD, pParent) }+RF~~H/
{ oJ;O>J@c
//{{AFX_DATA_INIT(CCaptureDlg) {uQ)p=
m_bControl = FALSE; w)y9!li
m_bAlt = FALSE; _I}L$
m_bShift = FALSE; gBiQIhz
m_Path = _T("c:\\"); >^\>-U|
m_Number = _T("0 picture captured."); [#*?uu+
jK
nCount=0; V1fvQ=9
bRegistered=FALSE; +}L3T"
bTray=FALSE; ~1]2A[`s!
//}}AFX_DATA_INIT LU IT=+
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5\kZgXWIh
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Y"
+1,?yH
} AqKx3p6
2Q'XB
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 08n%%
F
{
a):Run
CDialog::DoDataExchange(pDX); jvQ+u L
//{{AFX_DATA_MAP(CCaptureDlg) MfpWow-#{
DDX_Control(pDX, IDC_KEY, m_Key); C.e|VzQa
DDX_Check(pDX, IDC_CONTROL, m_bControl); %LZM5Z^
DDX_Check(pDX, IDC_ALT, m_bAlt); Xgth|C}k
DDX_Check(pDX, IDC_SHIFT, m_bShift); iYQy#kO
DDX_Text(pDX, IDC_PATH, m_Path); YU0HySP:
DDX_Text(pDX, IDC_NUMBER, m_Number); '<W,-i
//}}AFX_DATA_MAP HF=C8ZtlL
} 1*,~ 1!>
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BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) WUK.>eM0
//{{AFX_MSG_MAP(CCaptureDlg) &*:)5F5
ON_WM_SYSCOMMAND() D.CsnfJ
ON_WM_PAINT() y<x_v )k-
ON_WM_QUERYDRAGICON() $cpQ7
ON_BN_CLICKED(ID_ABOUT, OnAbout) <7-,`
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) =
Vr[V@
ON_BN_CLICKED(ID_CHANGE, OnChange) TKBK3N
//}}AFX_MSG_MAP 2yO)}g FJ
END_MESSAGE_MAP() HNUR6H&Fta
\ui~n:aWJ
BOOL CCaptureDlg::OnInitDialog() :a!a
{ @DC2ci
>
CDialog::OnInitDialog(); h|uP=0
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); T( Gf~0HYF
ASSERT(IDM_ABOUTBOX < 0xF000); .O-DVW Cm
CMenu* pSysMenu = GetSystemMenu(FALSE); 9X&qdA/q
if (pSysMenu != NULL) e`2R{H
{ -V_S4|>
CString strAboutMenu; SR8Kzk{
strAboutMenu.LoadString(IDS_ABOUTBOX); #2'&=?J1r
if (!strAboutMenu.IsEmpty()) N4(VRA
{ )n[Mh!mn
pSysMenu->AppendMenu(MF_SEPARATOR); <mgTWv
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); WuZn|j'
} [)6E)E`_e
} @' :um
SetIcon(m_hIcon, TRUE); // Set big icon ^^Q32XC,
SetIcon(m_hIcon, FALSE); // Set small icon e6xjlaKb
m_Key.SetCurSel(0); `ip69 IF2*
RegisterHotkey(); %f(.OR)6{
CMenu* pMenu=GetSystemMenu(FALSE); |oi49:NXn
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _p2<7x i
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9@*>$6
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0bL=l0N$W
return TRUE; // return TRUE unless you set the focus to a control UT7lj wT
} sW3D
(
n
oc%le2
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Kf<_A{s
{ >@e%,z
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ;9 n8on\
{ (gC^5&11
CAboutDlg dlgAbout; V+ ~2q=
dlgAbout.DoModal(); MCpK^7]k
} @gGuV$Mw
else {QkH%jj
{ "8TMAF|i4
CDialog::OnSysCommand(nID, lParam); a2_IF,p*?
} \~j(ui|
} ]H'82a
*G|]5
void CCaptureDlg::OnPaint() l8lR5<
{ \gv
x)S11
if (IsIconic()) ?o'arxCxZn
{ qc"/T16M]
CPaintDC dc(this); // device context for painting gCI'YEx
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); &: 8 &;vk
// Center icon in client rectangle "$;:dfrU
int cxIcon = GetSystemMetrics(SM_CXICON); PH &ms
int cyIcon = GetSystemMetrics(SM_CYICON); $^ dk>Hj>4
CRect rect; JT ^0AZ_*
GetClientRect(&rect); rX}==`#\
int x = (rect.Width() - cxIcon + 1) / 2; J0bs$
int y = (rect.Height() - cyIcon + 1) / 2; (uz!:dkvx
// Draw the icon CPM6T$_qE
dc.DrawIcon(x, y, m_hIcon); 3?CpylCO
} R}<s~` Pl
else zb)SlR
{ ]J]p:Y>NL
CDialog::OnPaint(); j=QjvWD
} 'E8Qi'g
} w.-i !Ls
/UyE- "S
HCURSOR CCaptureDlg::OnQueryDragIcon() SP1oBR"3
{ %d\+(:uu/
return (HCURSOR) m_hIcon; A8Y~^wn
} T`[ZNq+${
)`7h,w
J[1
void CCaptureDlg::OnCancel() ~ZN9 E-uL
{ gq &85([
if(bTray) DTVnQC
DeleteIcon(); qiJ{X{lI
CDialog::OnCancel(); DdBrJ x
} YZ
P
q2i~<;Z)9
void CCaptureDlg::OnAbout() HjR<4;2
{ bvTkSEN
CAboutDlg dlg; M)Q+_c2*
dlg.DoModal(); Vp4]
} !Ve3:OZ.nO
%z(=GcWm
void CCaptureDlg::OnBrowse() >(a_9l;q
{ Xq^{P2\w1
CString str; "
N4]e/.V
BROWSEINFO bi; niBpbsO
char name[MAX_PATH]; L]")TQ
ZeroMemory(&bi,sizeof(BROWSEINFO)); 4`]1W,t
bi.hwndOwner=GetSafeHwnd(); `"4EE}eQc
bi.pszDisplayName=name; AOUO',v
bi.lpszTitle="Select folder"; "ET"dMxU
bi.ulFlags=BIF_RETURNONLYFSDIRS; #JM*QVzv
LPITEMIDLIST idl=SHBrowseForFolder(&bi); .JjuY'-Q
if(idl==NULL) biK.HL\V
return;
&|*|
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); t/(j8w
str.ReleaseBuffer(); FM];+d0
m_Path=str; b=EZtk6>
if(str.GetAt(str.GetLength()-1)!='\\') 9Ua@-
m_Path+="\\"; /% 1lJD
UpdateData(FALSE); mJT
m/C
} OSU=O
Q)&Ztw<
void CCaptureDlg::SaveBmp() mj~CCokF{?
{ Y
[S^&pF
CDC dc; FFGTIT# {"
dc.CreateDC("DISPLAY",NULL,NULL,NULL); (^\i(cfu6Q
CBitmap bm; '5\1uB PKW
int Width=GetSystemMetrics(SM_CXSCREEN); +[+Jd)Z
int Height=GetSystemMetrics(SM_CYSCREEN); _Z&R'`kg
bm.CreateCompatibleBitmap(&dc,Width,Height); ;_*F [
}w
CDC tdc; K)OlCpHc
tdc.CreateCompatibleDC(&dc); `BY`ltW
CBitmap*pOld=tdc.SelectObject(&bm);
eD0@n
:
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); k/O&,T77}J
tdc.SelectObject(pOld);
!^\/
1^
BITMAP btm; b
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bm.GetBitmap(&btm); eyV904<F
DWORD size=btm.bmWidthBytes*btm.bmHeight; .jw)e!<\N
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =Y0m;-1M
BITMAPINFOHEADER bih;
VVY\W!
bih.biBitCount=btm.bmBitsPixel; +a;j>hh
bih.biClrImportant=0; i|Wn*~yFOO
bih.biClrUsed=0; RJM(+5xQ|
bih.biCompression=0; qZG >FC37
bih.biHeight=btm.bmHeight; 5Tq 3L[T5;
bih.biPlanes=1; &h-1Z}
bih.biSize=sizeof(BITMAPINFOHEADER); m\=u/Zip
bih.biSizeImage=size; gE~31:a^
bih.biWidth=btm.bmWidth; !5-[kG&
bih.biXPelsPerMeter=0; V>Cf
8>m
bih.biYPelsPerMeter=0; LX'US-B.!
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $'Z!Y;Ue
static int filecount=0; 0M p>X
CString name; Ygb#U'|
name.Format("pict%04d.bmp",filecount++); Z(P#]jI]
name=m_Path+name; nFSa~M
BITMAPFILEHEADER bfh; G$b4`wt
bfh.bfReserved1=bfh.bfReserved2=0; G <q@K-
bfh.bfType=((WORD)('M'<< 8)|'B'); hyp`6?f
bfh.bfSize=54+size; N8TO"`wdbs
bfh.bfOffBits=54; K(^x)w r-:
CFile bf; }2S \-
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ oCS NA.z
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); xAflcY>Ozs
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 'I2)-=ZL6
bf.WriteHuge(lpData,size); IcZ 'KV
bf.Close(); NR5A"_'
nCount++; =k
z;CS+
} [#tW$^UD
GlobalFreePtr(lpData); /e\dsC{uJ
if(nCount==1) y:L|]p}huE
m_Number.Format("%d picture captured.",nCount); zoU.\]#C
else 57r)&8
m_Number.Format("%d pictures captured.",nCount); .IgQn|N
UpdateData(FALSE); jQhf)B
} PZ s
Z:Wix|,ONS
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) TH-^tw
{ M<729M
if(pMsg -> message == WM_KEYDOWN) IP3-lru
{ yY+2;`CH
if(pMsg -> wParam == VK_ESCAPE) 6-~
return TRUE; Velmq'n
if(pMsg -> wParam == VK_RETURN) foeVjL:T
return TRUE; tj0vB]c
} Dcf`+?3
return CDialog::PreTranslateMessage(pMsg); [Zf<r1m
} Jc+U$h4
V-31x )
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) k1<Py$9"
{ >cp9{+#f
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -'2.^a-8-g
SaveBmp(); E$T#o{pai
return FALSE; _rM%N+$&d_
} fITml6mbE
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Vswi /(
CMenu pop; P|?z1JUd
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >Et?7@
CMenu*pMenu=pop.GetSubMenu(0); U6Qeode
pMenu->SetDefaultItem(ID_EXITICON); {2nXItso
CPoint pt; ATU@5,9
GetCursorPos(&pt); 1\2 m'o
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]kPco4
if(id==ID_EXITICON) Dj|S
DeleteIcon(); `C1LR,J
else if(id==ID_EXIT) (R,eWWF8~
OnCancel(); ?OSd8E+itM
return FALSE; i0P+,U
} "YBA$ef$
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _C4^J
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) r{btBv
AddIcon(); V6L_aee}CK
return res; M$)+Uo2
} ~^eAS;
Wwz>tE
void CCaptureDlg::AddIcon() PIA&s6U
{ N P"z
NOTIFYICONDATA data; ;#
{x_>M
data.cbSize=sizeof(NOTIFYICONDATA); (7IF5g\
CString tip; Q*wx6Pu8
tip.LoadString(IDS_ICONTIP); _YY)-H
data.hIcon=GetIcon(0); }LRAe3N%8
data.hWnd=GetSafeHwnd(); I4*N
strcpy(data.szTip,tip); ^Iz.O
data.uCallbackMessage=IDM_SHELL; sw&Qks?V
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; v6GWD}HH,
data.uID=98; Zj JD@,j
Shell_NotifyIcon(NIM_ADD,&data); %F7aFvl*
ShowWindow(SW_HIDE); ^ey\ c1K
bTray=TRUE; WM#!X!Vo
} IH0Uq_
0C7"*H0R
void CCaptureDlg::DeleteIcon() bhI8b/
{ x\=h^r#w
NOTIFYICONDATA data; myo/}58Nv
data.cbSize=sizeof(NOTIFYICONDATA); s[g1ei9
data.hWnd=GetSafeHwnd(); Mf
*qr9*
data.uID=98; c]9OP9F
Shell_NotifyIcon(NIM_DELETE,&data); 1v Thb
ShowWindow(SW_SHOW);
D;5RcZ
SetForegroundWindow(); s^U^n//
ShowWindow(SW_SHOWNORMAL); F,D&
bTray=FALSE; V$@2:@8mo
} vD(;VeW[
VS`S@+p
void CCaptureDlg::OnChange() dU\fC{1Z
{ T|m+ULp~
RegisterHotkey(); ~$@I <=L
} e' Zg F~
3lJK[V{'#'
BOOL CCaptureDlg::RegisterHotkey() aV ^2
{ 6QV/8IX
UpdateData(); B<)(7GTv7"
UCHAR mask=0; 8dpVB#]pp,
UCHAR key=0; (T ^aZuuS
if(m_bControl) vL><Y.kOEs
mask|=4; emHi=[!i
if(m_bAlt) \KEL.}B9E
mask|=2; njIvVs`q
if(m_bShift) lRrOoON
mask|=1; Pk,^q8;
key=Key_Table[m_Key.GetCurSel()]; FUH1Z+9
if(bRegistered){ ^b%AwzHH}
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 1/gh\9h
bRegistered=FALSE; C/E3NL8
} H1w;Wb1se
cMask=mask; +V) (,f1
cKey=key; QW!'A`*x
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }A#FGH+
return bRegistered; >?kt3.IQ!X
} qjWgyhL
JmBYD[h,
四、小结 *)w
8fq
J:>TV.TP
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。