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:
]0[ot$Da6
"Nz@jv? 一、实现方法
(ss,x CF *OIBMx#qxn 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
I_ kA!^ F6b;qb6n #pragma data_seg("shareddata")
}qWB=,8HQ HHOOK hHook =NULL; //钩子句柄
Qw
}1mRv UINT nHookCount =0; //挂接的程序数目
Zb|a\z8 ? static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Mn<s9ITS- static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
@`8a3sL) static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
LR\8M(rtvH static int KeyCount =0;
pd& HC static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
-YmIRocx #pragma data_seg()
2JcP4!RD 8OO[Le]1 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
U0srwt97S &\Lu}t7Ru DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
12_7UWZ" 8G9( )UF. BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
0
0|!g"E>$ cKey,UCHAR cMask)
B7YE+ {
.+<Ka0 BOOL bAdded=FALSE;
eH[i<Z for(int index=0;index<MAX_KEY;index++){
x5Fo?E if(hCallWnd[index]==0){
^tI&5S]nE hCallWnd[index]=hWnd;
<[K)PI HotKey[index]=cKey;
:^xNHMp! HotKeyMask[index]=cMask;
*[BtW56- bAdded=TRUE;
i1A<0W| KeyCount++;
v-^tj}jA break;
fakad#O }
t5u#[* }
OdL/%Zp} return bAdded;
VeZd\Oe }
+c,
^KHW //删除热键
T:9M|mD BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
KaHe( {
C*B5"s" BOOL bRemoved=FALSE;
*K@O3n for(int index=0;index<MAX_KEY;index++){
1oQbV`P if(hCallWnd[index]==hWnd){
{6wXDZxv if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
(TO<SY3AB hCallWnd[index]=NULL;
-m mQ]'.0 HotKey[index]=0;
kC6Y?g HotKeyMask[index]=0;
4FZ/~Y1} bRemoved=TRUE;
|"9vq<` KeyCount--;
i~R+g3oi break;
C3~~h|: }
"a33m:]J }
Msfxce }
HDKY7Yr return bRemoved;
VB T66kV }
W
tHJG5 q5@Nd3~h MpvGF7H DLL中的钩子函数如下:
o@]n<ZYo _x#y LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
bAuiMw7! {
]` A*7 BOOL bProcessed=FALSE;
VM\\.L
if(HC_ACTION==nCode)
n<<arO"cv {
?~#[cx if((lParam&0xc0000000)==0xc0000000){// 有键松开
,:MUf]Ky switch(wParam)
NYs<`6P:Y {
o{n#f?EA case VK_MENU:
B,%KvL&xMX MaskBits&=~ALTBIT;
OL:hNbw'~T break;
4^4T#f2=e case VK_CONTROL:
B4+c3M\$V MaskBits&=~CTRLBIT;
ua &uR7 break;
1/qD5 *`Y case VK_SHIFT:
_bg Zl MaskBits&=~SHIFTBIT;
jVN=_Y}\ break;
GC3d7 default: //judge the key and send message
Fm6]mz%~u# break;
`w8cV? }
x!pd50- for(int index=0;index<MAX_KEY;index++){
)1R[X!KQ7 if(hCallWnd[index]==NULL)
ImH9 F\ continue;
0Q8iX) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
A )CsF {
,1lW`Krx SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
hNgT/y8 bProcessed=TRUE;
!W0JT#0 }
Eb63O }
X}C8!LA }
R~hIo aiN else if((lParam&0xc000ffff)==1){ //有键按下
Z?3B1o9 switch(wParam)
Yl$@/xAa {
l[m*csDk" case VK_MENU:
j
\d)#+; MaskBits|=ALTBIT;
Zy:q)'D= break;
K V?+9qa, case VK_CONTROL:
2Dvq3VbiO" MaskBits|=CTRLBIT;
O&~
@ior break;
zcH"Kh& case VK_SHIFT:
R%)F9P$o MaskBits|=SHIFTBIT;
>uQjygjj break;
*ezft&{)` default: //judge the key and send message
'"rm66 break;
5nceOG8 }
Nlwt}7 for(int index=0;index<MAX_KEY;index++){
Z("N
*`VP; if(hCallWnd[index]==NULL)
CWYOzqf continue;
B,Tv9(sv if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*-q&~ {
TeR bW SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
!bnnUCTb\ bProcessed=TRUE;
[z=!OFdE }
ZC<EPUV( }
EGFPv'De }
R$`&g@P=" if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
@KLX,1K for(int index=0;index<MAX_KEY;index++){
Qm"~XP if(hCallWnd[index]==NULL)
;:J"- p continue;
/7,@q?v if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
M\7F1\ X SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
t
U~q4$qqE //lParam的意义可看MSDN中WM_KEYDOWN部分
sE|8a }
VsK8 :[Al }
Ah5o>ZtcO }
T-kHk( return CallNextHookEx( hHook, nCode, wParam, lParam );
6U%d3"T }
1 <lfo^B FB>P39u 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:
d.B<1"MQ '}(Fj2P79 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
m6xbO BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
M\IdQY-c ';D>Z?l 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:
l^}5PHLd HL>l.IG? LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
F J?]|S.?, {
N}{V*H^0QU if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
EBQ_c@ {
~G6xk/+n-m //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
/6n"$qon6 SaveBmp();
@$$J}~{ return FALSE;
}v_|N"@ }
8(S|=c R …… //其它处理及默认处理
0D `9 }
4Sdj#w n%~r^C_ $ >].;y?$ 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。
UX|3LpFX&I t0P_$+w.> 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。
!A|}_K1Cr JPj/+f 二、编程步骤
<dBz]W vQ$"|8, 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";
1 un! p#rqe<Ua 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
>!o!rs O]F(vHK\ 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;
+x4*T 4ISIg\:c* 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;
[kgCB7.V H&k&mRi 5、 添加代码,编译运行程序。
,MHF j{=}?+M 三、程序代码
7.n\a@I/ Zx6h%l,% ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
g ssEdJ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Jk{v(W# #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
4wa3$Pk #if _MSC_VER > 1000
jC?l :m? #pragma once
b0se-#+
#endif // _MSC_VER > 1000
07ppq?,y #ifndef __AFXWIN_H__
puEu)m^ #error include 'stdafx.h' before including this file for PCH
^d(gC%+!u #endif
.O+,1&D5 #include "resource.h" // main symbols
)QnsRW{D" class CHookApp : public CWinApp
g0;6}n {
I_`NjJ;61 public:
/@DJf\`vM CHookApp();
Uz]=`F8 // Overrides
l6IT o@&J // ClassWizard generated virtual function overrides
{ W5
_KX //{{AFX_VIRTUAL(CHookApp)
R7FI{A public:
u-V(
2? virtual BOOL InitInstance();
hW;n^\lF#e virtual int ExitInstance();
mOLz(0 //}}AFX_VIRTUAL
W}(T5D" 3x //{{AFX_MSG(CHookApp)
j4=\MK // NOTE - the ClassWizard will add and remove member functions here.
-G=.3
bux // DO NOT EDIT what you see in these blocks of generated code !
Y2g%{keo //}}AFX_MSG
*F(<:3;2 DECLARE_MESSAGE_MAP()
ZHoYnp-~z };
,&Zk63V LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
8e`HXU(A BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
.&>3nu BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
F6h IG G BOOL InitHotkey();
[w+1<ou;j BOOL UnInit();
65mfq&"P? #endif
,k9.1kjO*) i?mUQ'H //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
OsYZa`$, #include "stdafx.h"
ps/|^8aGZ #include "hook.h"
:."+&gb #include <windowsx.h>
yy3`E}vX7 #ifdef _DEBUG
3 "Qg"\ #define new DEBUG_NEW
?TmVLny #undef THIS_FILE
]{ch]m static char THIS_FILE[] = __FILE__;
tWTC'Gx-J #endif
N\CHIsVm> #define MAX_KEY 100
E^pn-rB #define CTRLBIT 0x04
}R hSt] #define ALTBIT 0x02
y4&x`|tv #define SHIFTBIT 0x01
m-cw5lW #pragma data_seg("shareddata")
t[G7&ovj
HHOOK hHook =NULL;
9p4SxMMO UINT nHookCount =0;
vP%:\u:{ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
#9qX:*>h static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
f&$$*a static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
-7Kstc- static int KeyCount =0;
+p]@ b static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
'S=eW_ 0/ #pragma data_seg()
w2r*$Q HINSTANCE hins;
,1vFX$ void VerifyWindow();
vEt+^3= BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
7p{uRSE4._ //{{AFX_MSG_MAP(CHookApp)
]2[\E~^KU // NOTE - the ClassWizard will add and remove mapping macros here.
B.gEV*@ // DO NOT EDIT what you see in these blocks of generated code!
;L%\[H>G //}}AFX_MSG_MAP
'Q.5`o END_MESSAGE_MAP()
X|R"8cJ OE}c$!@ CHookApp::CHookApp()
,wyEo>>4) {
wDBU+Z // TODO: add construction code here,
D<*)^^ // Place all significant initialization in InitInstance
Q7mikg=1- }
ZA'0q {D[z>I;D CHookApp theApp;
hN!{/Gc| LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
v.g Ai6 {
:e}j$vF
BOOL bProcessed=FALSE;
4#ifm# if(HC_ACTION==nCode)
+.m:-^9 {
<LX-},?P if((lParam&0xc0000000)==0xc0000000){// Key up
d%p{l)Hd switch(wParam)
:"Rx$;a {
dw| VH1fS case VK_MENU:
Emk:@$3{r MaskBits&=~ALTBIT;
w`zS`+4 break;
UyDq`@h case VK_CONTROL:
aHNn!9#1 MaskBits&=~CTRLBIT;
E*+]Iq1u break;
)cm^;(#pV case VK_SHIFT:
)R"UX:Q> MaskBits&=~SHIFTBIT;
=:H EF;! break;
`2q]ju default: //judge the key and send message
8N`Rf;BM break;
> aCY }
$bZ5@)E for(int index=0;index<MAX_KEY;index++){
*I k/Vu%; if(hCallWnd[index]==NULL)
| "eC0u continue;
jgfr_"@A if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
e&Z ?I2J {
A3.pz6iT> SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
`t
g=__D bProcessed=TRUE;
aZo>3z; }
%V#? 1{ }
0P;LH3sx }
Nlu]f-i': else if((lParam&0xc000ffff)==1){ //Key down
JDOn`7!w switch(wParam)
Z)}2bJwA {
"`*
>co6r case VK_MENU:
%e+*&Z', MaskBits|=ALTBIT;
F$O$Y[ break;
U.N&~S case VK_CONTROL:
Xl>ZnI]; MaskBits|=CTRLBIT;
# `@jVX0 break;
+.xK`_[M case VK_SHIFT:
!0v3Lu~j MaskBits|=SHIFTBIT;
2=naPTP( break;
bPuO~#iN~ default: //judge the key and send message
nM99AW break;
]qEg5:yY }
Xpfw2;`U' for(int index=0;index<MAX_KEY;index++)
Z[1|('
{
_gl1Qtv@rf if(hCallWnd[index]==NULL)
J!@R0U. continue;
t&_X{!1X"w if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&(|x-OT {
GP`sOPr SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Z55C4F5v bProcessed=TRUE;
&=wvlI52` }
]?Q<lMG }
>g{b'Xx }
p>W@h*[6w if(!bProcessed){
pLMaXX~4_ for(int index=0;index<MAX_KEY;index++){
LQ||7>{eX if(hCallWnd[index]==NULL)
)C rsm& continue;
[?2,(X0yh1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
jQ-2SA O SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
+Y>oNX1KN }
df&.!7_R` }
gy"<[N
.?c }
,!P}Y[| return CallNextHookEx( hHook, nCode, wParam, lParam );
[Y^h)k{-$ }
}gd'pgN"t q&LCMnv"P BOOL InitHotkey()
ylQ9Su>o {
NT9| ``^Z if(hHook!=NULL){
*thm)Mn nHookCount++;
bE3mOml return TRUE;
9A9T'g)Du }
Qr?1\H:Lq else
8cuI-Swz hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
X-psao0tI` if(hHook!=NULL)
w`gT]Rn nHookCount++;
1r3}
V7 return (hHook!=NULL);
$|AasT5w }
Xu|2@?l9 BOOL UnInit()
*dsI>4%m {
h]j>S if(nHookCount>1){
v'r)d-T nHookCount--;
;f)AM}~^Q return TRUE;
(,cG+3r] }
C3(h j BOOL unhooked = UnhookWindowsHookEx(hHook);
:Vw{ lB if(unhooked==TRUE){
o3h>)4 nHookCount=0;
Q2*
~9QkU hHook=NULL;
0:B%,nUM }
wGxH return unhooked;
sFsf~| }
^Ww5@ g1Osd7\o BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[c v!YE {
-TS,~`O BOOL bAdded=FALSE;
R{Cbp=3J for(int index=0;index<MAX_KEY;index++){
y>^0q/=]?O if(hCallWnd[index]==0){
`Io#440; hCallWnd[index]=hWnd;
h,,B"vPS HotKey[index]=cKey;
4b6)+*[O HotKeyMask[index]=cMask;
eL{$=Um bAdded=TRUE;
DD`DU^o< KeyCount++;
Gz(l~!n~a break;
PM'2zP[*W }
Z_[L5B]Gwd }
!-ZY_ return bAdded;
F6C7k9 }
[\&2& lR]FQnZ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
{.J<^V {
j-ob7(v)*] BOOL bRemoved=FALSE;
Qraa0]56 for(int index=0;index<MAX_KEY;index++){
#qeC)T if(hCallWnd[index]==hWnd){
6E.[F\u if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
s-~`Ao'
< hCallWnd[index]=NULL;
DgB;6Wl HotKey[index]=0;
_CBMU'V HotKeyMask[index]=0;
`g0^W/j bRemoved=TRUE;
k(_OhV_ KeyCount--;
DhD##5a break;
7OS i2 }
08! _B\ }
4&v&XLkb }
V/zmbo) return bRemoved;
*p9k> )'J }
N7YCg 0|8cSE<
i
void VerifyWindow()
D|^N9lDaQ {
[a?bv7Kz for(int i=0;i<MAX_KEY;i++){
A;o({9VH`Z if(hCallWnd
!=NULL){ Ge^,hAM'
if(!IsWindow(hCallWnd)){ ~ H/ZiBL@
hCallWnd=NULL; p"j&s
HotKey=0; (!YJ:,!so
HotKeyMask=0; $aN%[
KeyCount--; pgZQ>%
} QS1lg
} PWkSl
} zS h9`F
} |nGv:= H@
|$~]|SK
BOOL CHookApp::InitInstance() v5U'ky:
{ Oqq'r "S
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ze21Uj1x*
hins=AfxGetInstanceHandle(); hMUUnr"8;i
InitHotkey(); 'yV*eG?^&
return CWinApp::InitInstance(); 34nfL: y
} 5fYWuc9}z
}w-M.
int CHookApp::ExitInstance() ai;Q,Vy
{ #&1gVkvp
VerifyWindow(); q03+FLEfC
UnInit(); Q{an[9To~P
return CWinApp::ExitInstance(); T8x8TN"
} 1kR. .p<"
IM5[O}aq
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file g:GywXW
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) gQJLqs"F
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ bbDm6,
#if _MSC_VER > 1000 iyXd"O
#pragma once &xGpbJG
#endif // _MSC_VER > 1000 #M5d,%?+#[
@u:`
class CCaptureDlg : public CDialog w~Nat7nD
{ Cpy&2o-%v
// Construction }X/YMgJ
public: Sw5:T
BOOL bTray; 5HE5$S
BOOL bRegistered; Ih4$MG6QC
BOOL RegisterHotkey(); AjoIL
UCHAR cKey; oN%zpz;OR
UCHAR cMask; 6a_U[-a9;
void DeleteIcon(); {<-wm-]mo
void AddIcon(); DiTpjk]c`
UINT nCount; S\Le;,5Z
void SaveBmp(); b?qV~Dgk`
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]@#wR
// Dialog Data o>bi~(H
//{{AFX_DATA(CCaptureDlg) q/d?cLgl
enum { IDD = IDD_CAPTURE_DIALOG }; yPs6_Qo!p
CComboBox m_Key; >Gk<a
BOOL m_bControl; po,Ue>n/
BOOL m_bAlt; *ZFF$0}
BOOL m_bShift; J9DI(`
CString m_Path; {9.UeVz
CString m_Number; 3IB9-wG
//}}AFX_DATA -;FAS3(wy
// ClassWizard generated virtual function overrides ;Krb/qr4_
//{{AFX_VIRTUAL(CCaptureDlg) 5X>~39(r
public: \NEk B&^n
virtual BOOL PreTranslateMessage(MSG* pMsg); l&:8 'k+%=
protected: c_?^:xs:d
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,2+d+Zuh
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -Fu,oEj{*
//}}AFX_VIRTUAL |5X59!
JL
// Implementation xXa4t4gR
protected: T?6<1nU)
HICON m_hIcon; $ #2<f 6
// Generated message map functions FQ`1c[M@
//{{AFX_MSG(CCaptureDlg) "Z;({a$v
virtual BOOL OnInitDialog(); Oh>hyY)}
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); q-uzu !
afx_msg void OnPaint(); PAtv#)h
afx_msg HCURSOR OnQueryDragIcon(); 9F?-zn;2s
virtual void OnCancel(); CQ^(/B^c
afx_msg void OnAbout(); <t*<SdAq>`
afx_msg void OnBrowse(); Vsw:&$
afx_msg void OnChange(); d_0(;'
//}}AFX_MSG Uxik&M
DECLARE_MESSAGE_MAP() (
^@i(XQ
}; '}B"071)<
#endif ~K99DK.
9c }qVf-i
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4cM0f,nc+
#include "stdafx.h" (2M00J-o
#include "Capture.h" /c 7z[|
#include "CaptureDlg.h" +R HiX!PG
#include <windowsx.h> -!O8V
#pragma comment(lib,"hook.lib") z,7;+6*=L
#ifdef _DEBUG @:#J^CsM+'
#define new DEBUG_NEW + G[zE
#undef THIS_FILE |yzv o"3
static char THIS_FILE[] = __FILE__; /h.{g0Xc
#endif xpo^\E?2
#define IDM_SHELL WM_USER+1 #62ThH~
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hsS&|7Pt
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N:k>V4oE
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; tcsb]/my
class CAboutDlg : public CDialog gsM^Pu09ud
{ |G$-5
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public: 6w{_+=T
CAboutDlg(); fjl9*
// Dialog Data LL)t)
//{{AFX_DATA(CAboutDlg) %"fO^KA.h]
enum { IDD = IDD_ABOUTBOX }; DI2e%`$
//}}AFX_DATA ls!A'@J
// ClassWizard generated virtual function overrides !Ko>
//{{AFX_VIRTUAL(CAboutDlg) !G0Mg; ,
protected: w?^[*_Y
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support VNIl%9:-l
//}}AFX_VIRTUAL Q^nfD
// Implementation ?wCX:?g
protected: F ]Zg
//{{AFX_MSG(CAboutDlg) yRl
//}}AFX_MSG 6
R})KIG
DECLARE_MESSAGE_MAP() U` HY
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}; |9IOZ>H9
l&e$:=;8
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ba|}$jo
{ q*`
m%3{
//{{AFX_DATA_INIT(CAboutDlg) qQG? k~r
//}}AFX_DATA_INIT ,+6u6
} ruB D
^-
g<M!]0OK
void CAboutDlg::DoDataExchange(CDataExchange* pDX) xS5 -m6/
{ TNA7(<"fV|
CDialog::DoDataExchange(pDX); Pmd[2/][
//{{AFX_DATA_MAP(CAboutDlg) xT*c##
//}}AFX_DATA_MAP <!UnH6J.b
} kh2TDxa&
PsXCpyY!s
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) FdzdoMY
//{{AFX_MSG_MAP(CAboutDlg) $,U/,XA
{E
// No message handlers ,*d8T7T
//}}AFX_MSG_MAP SlR//h
END_MESSAGE_MAP() { AYW
C6Y
F;}JSb"
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7H{1i
: CDialog(CCaptureDlg::IDD, pParent) jG;J qT
{ NW`.7'aWT
//{{AFX_DATA_INIT(CCaptureDlg) ,(K-;Id4
m_bControl = FALSE; 0;">ETh=
m_bAlt = FALSE; at@tS>Dv
m_bShift = FALSE; R#;xBBt8
m_Path = _T("c:\\"); &?H$-r1/?V
m_Number = _T("0 picture captured."); 7Vh
nCount=0; w)@Wug
bRegistered=FALSE; S\:+5}
bTray=FALSE; 1 Ga3[g
//}}AFX_DATA_INIT Z@&%"nO
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 tUc<ExvP,
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); M."/"hV`-
} ([>__c/Nd
Y)pop:y t
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ]j6pd*H
{ )lS04|s
CDialog::DoDataExchange(pDX); 2 (l0Lq*
//{{AFX_DATA_MAP(CCaptureDlg) ?#(LH\$l_
DDX_Control(pDX, IDC_KEY, m_Key); ]k7%p>c=B
DDX_Check(pDX, IDC_CONTROL, m_bControl); 37a1O>A
DDX_Check(pDX, IDC_ALT, m_bAlt); ")i)vXF'
DDX_Check(pDX, IDC_SHIFT, m_bShift); IjRUr \ l
DDX_Text(pDX, IDC_PATH, m_Path); WH1" HO
DDX_Text(pDX, IDC_NUMBER, m_Number); C5I7\9F)
//}}AFX_DATA_MAP uK"FopUJ4i
} 'F.P93
W4 d32+V
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Ti_G
//{{AFX_MSG_MAP(CCaptureDlg) n9={D
ON_WM_SYSCOMMAND() tm=,x~
ON_WM_PAINT() YARL/V
ON_WM_QUERYDRAGICON() Z Se30Rl\
ON_BN_CLICKED(ID_ABOUT, OnAbout) X 5
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ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ~i?A!
ON_BN_CLICKED(ID_CHANGE, OnChange) z|%Pi J,
//}}AFX_MSG_MAP X5[t6q!
END_MESSAGE_MAP() {x,)OgK!{
&DGz/o
BOOL CCaptureDlg::OnInitDialog() uZrp ^
{ .qZz'Eq[
CDialog::OnInitDialog(); g1[BrT,
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ^ `";GnH0
ASSERT(IDM_ABOUTBOX < 0xF000); _!DH/?aU
CMenu* pSysMenu = GetSystemMenu(FALSE); r/ g{j
if (pSysMenu != NULL) jF}kV%E
{ l~]] RgU
CString strAboutMenu; *(q?O_3,b
strAboutMenu.LoadString(IDS_ABOUTBOX); AmDOv4
if (!strAboutMenu.IsEmpty())
-WqhOZ
{ K)J_q3qo
pSysMenu->AppendMenu(MF_SEPARATOR); IA.7If&k
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [j'!+)>_
} +z?gf*G_W'
} /Z^a,%1
SetIcon(m_hIcon, TRUE); // Set big icon @XzfuuE]
SetIcon(m_hIcon, FALSE); // Set small icon k@|px#kq
m_Key.SetCurSel(0); SQ[D2v
RegisterHotkey(); bRm;d_9zC
CMenu* pMenu=GetSystemMenu(FALSE); lD[@D9
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); j0{`7n
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); H2:
Zda#
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <af#
C2`B
return TRUE; // return TRUE unless you set the focus to a control ,v8e7T
} |w*s:p
7A(4`D J
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0Pf88 '6
{ p$1 'e,G
if ((nID & 0xFFF0) == IDM_ABOUTBOX) "ufSHrZv
{ Z@Q*An
CAboutDlg dlgAbout; 6X h7Bx1
dlgAbout.DoModal(); v(.mM9>
} ~=OJCKv5(
else _p0Yhju?
{ [=jZP,b&),
CDialog::OnSysCommand(nID, lParam); ~210O5^
} L$OZ]
} ^\O*e)#*
Y"8@\73(R
void CCaptureDlg::OnPaint() MjC<N[WO>N
{ TCyev[(
if (IsIconic()) o<!H/PN
{ T2w4D!
CPaintDC dc(this); // device context for painting ZOV,yuD{8{
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); zi6J|u
// Center icon in client rectangle 6z U
int cxIcon = GetSystemMetrics(SM_CXICON); wQy~5+LE
int cyIcon = GetSystemMetrics(SM_CYICON); ,%IP27bPW
CRect rect; dR\yRC]I
GetClientRect(&rect); T]&?^QGAZ
int x = (rect.Width() - cxIcon + 1) / 2; eUNaq&M
int y = (rect.Height() - cyIcon + 1) / 2; cK]n"6N[
// Draw the icon `0]N#G
T
dc.DrawIcon(x, y, m_hIcon); GZrN,M
} hfY/)-60o
else Fn`Zw:vp6
{ mq4Zy3H
CDialog::OnPaint(); "M
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} b;
C}=gg
} 4lX_2QT]E
unn2I|XH
HCURSOR CCaptureDlg::OnQueryDragIcon() 2H9hN4N
{ d<j`=QH
return (HCURSOR) m_hIcon; Wgte.K> /
} ?o+%ckH
d"-I^|[OM
void CCaptureDlg::OnCancel() Ff/Ap&0+
{ mTX:?>
if(bTray) GV1Ol^
DeleteIcon(); zx\-He
CDialog::OnCancel(); de W1>yh^_
} ]FVJQS2h
)YEAk@h@
void CCaptureDlg::OnAbout() W>w(|3\
{ (n B[aM
CAboutDlg dlg; tb~E.Lm\
dlg.DoModal(); E%v0@
} *> nOL
sv%E5@
void CCaptureDlg::OnBrowse() 5<PNl~0
{ Sq,>^|v4&e
CString str; #b428-
BROWSEINFO bi; 1ds4C:M+<
char name[MAX_PATH]; 4pT^*
ZeroMemory(&bi,sizeof(BROWSEINFO)); G9okl9;od
bi.hwndOwner=GetSafeHwnd(); c;q=$MO`
bi.pszDisplayName=name; (,o@/ -o
bi.lpszTitle="Select folder"; |T"vF`Kr(>
bi.ulFlags=BIF_RETURNONLYFSDIRS; /"La@M37
LPITEMIDLIST idl=SHBrowseForFolder(&bi); W3UxFs]$
if(idl==NULL) T:{&eWH
return; &)Qq%\EP4
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); #OM'2@
str.ReleaseBuffer(); [Y*>x2X
m_Path=str; Ve"(}z
if(str.GetAt(str.GetLength()-1)!='\\') @hA`f4^
m_Path+="\\";
$6UU58>n
UpdateData(FALSE); ; ,sNRES3
} m0^ "fMV
%(&ja_oO
void CCaptureDlg::SaveBmp() 8~Zw"
{ J'ce?_\?PY
CDC dc; (S W6?5
dc.CreateDC("DISPLAY",NULL,NULL,NULL); +i!HMyM
CBitmap bm; e6_8f*o|s
int Width=GetSystemMetrics(SM_CXSCREEN); 4s:M}=]N
int Height=GetSystemMetrics(SM_CYSCREEN); 9b=0
4aWHm
bm.CreateCompatibleBitmap(&dc,Width,Height); xP>cQEL ot
CDC tdc; GNM>hQ)h:
tdc.CreateCompatibleDC(&dc); w]qM
CBitmap*pOld=tdc.SelectObject(&bm); KZg2`8F
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); z0+JMZ/
tdc.SelectObject(pOld); g9^\QYh!
BITMAP btm; lFtEQ '}
bm.GetBitmap(&btm); <FBH;}]
DWORD size=btm.bmWidthBytes*btm.bmHeight; Fl($0}ER
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); b1#C,UWK
BITMAPINFOHEADER bih; rAHP5dx:
bih.biBitCount=btm.bmBitsPixel; (Ox&B+\v+v
bih.biClrImportant=0; 1QA/ !2E
bih.biClrUsed=0; C@ q#s
bih.biCompression=0; [N~7PNd S
bih.biHeight=btm.bmHeight; #'KM$l,P
bih.biPlanes=1; `qmwAT
bih.biSize=sizeof(BITMAPINFOHEADER); 6 L4\UTr
bih.biSizeImage=size; <?IDCOt ?
bih.biWidth=btm.bmWidth; %E@o8
bih.biXPelsPerMeter=0; {G vGV
bih.biYPelsPerMeter=0; lq53
xT
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &D[M<7T
static int filecount=0; 3YLfh`6
CString name; hY{4_ie=8
name.Format("pict%04d.bmp",filecount++); -E6av|c,F
name=m_Path+name; )! rD&l$tE
BITMAPFILEHEADER bfh; ?/MkH0[G =
bfh.bfReserved1=bfh.bfReserved2=0; d m"R0>
bfh.bfType=((WORD)('M'<< 8)|'B'); Ws3z-U>j
bfh.bfSize=54+size; W f"$
bfh.bfOffBits=54; S) zw[m
CFile bf; `_)9eGQ
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ U}X'RCM
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); %Bm{ctf#)
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); k]:`<`/I_
bf.WriteHuge(lpData,size); ".|8 (Y
bf.Close(); `
~m/
nCount++; lU
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} T7mT:z>:
GlobalFreePtr(lpData); N
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if(nCount==1) Gev\bQa
m_Number.Format("%d picture captured.",nCount); p#4*:rpq4
else SbX^DAlB1
m_Number.Format("%d pictures captured.",nCount); 'q;MhnU+
UpdateData(FALSE); ZhCz]z~tj6
} 3C!|!N1Hn
mIG>`7`7N
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) um$U3'0e
{ r]xN&Ne5Q
if(pMsg -> message == WM_KEYDOWN) N9d^;6;i
{ [-l>fP0
if(pMsg -> wParam == VK_ESCAPE) r0k:RJP
return TRUE; x1wD`r
if(pMsg -> wParam == VK_RETURN) H(n
fHp.3
return TRUE; S"Vr+x?
} *^]
return CDialog::PreTranslateMessage(pMsg); ~2hzyEh
} Q`J U[nY
W?E01"p
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kb~
s,@p
{ Oz\J+
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,)\G<q
yO6
SaveBmp(); ]5
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return FALSE; @+M1M2@Xz
} \NDW@!X
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ AX{<d@z`j
CMenu pop; rT;l#<#VE
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Z-CA9&4Uh
CMenu*pMenu=pop.GetSubMenu(0); rr`_\ut
pMenu->SetDefaultItem(ID_EXITICON); >clVV6B
CPoint pt; )cQ KR4x0^
GetCursorPos(&pt); Yy/,I]F
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;9)nG,P3
if(id==ID_EXITICON) a0JMLLa [I
DeleteIcon(); <w~$S0_
else if(id==ID_EXIT) 7Tr '<(A
OnCancel(); V+>RF
return FALSE; 2<0".5+I
} jl7>
LRESULT res= CDialog::WindowProc(message, wParam, lParam); /-lW$.+{?
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) zBTxM
AddIcon(); +7WpJ;C4
return res; `r=^{Y
} 4?(=?0/[
LQ Ux}
void CCaptureDlg::AddIcon() *j,noHUT~>
{ N!?~Dgw
NOTIFYICONDATA data; %CQa8<q
data.cbSize=sizeof(NOTIFYICONDATA); gJwX
CString tip; UjunIKX+
tip.LoadString(IDS_ICONTIP); NA@Z$Gy
data.hIcon=GetIcon(0); c+ZdfdR
data.hWnd=GetSafeHwnd(); _z]v;Q
strcpy(data.szTip,tip); jZ5ac=D&I
data.uCallbackMessage=IDM_SHELL; obbg#,
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; SI6?b1;-:F
data.uID=98; `{w|2 [C3
Shell_NotifyIcon(NIM_ADD,&data); V0,5c`H c
ShowWindow(SW_HIDE); {Gfsiz6
bTray=TRUE; 8KR17i1
} Gz\wmH&rVz
=Ldf#8J
void CCaptureDlg::DeleteIcon() <uoVGV5N
{ 0.!vp?
NOTIFYICONDATA data; P&c O2
data.cbSize=sizeof(NOTIFYICONDATA); vqUYr
data.hWnd=GetSafeHwnd(); <Cs9$J
data.uID=98; uW}M1kq?+l
Shell_NotifyIcon(NIM_DELETE,&data); x5rm
2C
ShowWindow(SW_SHOW); fK@UlMC]7
SetForegroundWindow(); 2WKIO|'
ShowWindow(SW_SHOWNORMAL); tQxAZ0B^
bTray=FALSE; OL#i!ia.
} Q-s5-&h(
h>xB"E|.
void CCaptureDlg::OnChange() z:O:g?A
{ g:c?%J
RegisterHotkey(); 9ygNJX'~
} /NPx9cLW^
ZW;Re5?DJ
BOOL CCaptureDlg::RegisterHotkey() M!VW/vdywL
{ [ryII hQ
UpdateData(); E'+z.~+
UCHAR mask=0; xw~oR|`U
UCHAR key=0;
VD,g3B p
if(m_bControl) -yIx:*KI
mask|=4; n]l3
)u
if(m_bAlt) ;L],i<F
mask|=2; / 8dRql-Ne
if(m_bShift) M>BVnB_,-
mask|=1; ms&5Bq+9
key=Key_Table[m_Key.GetCurSel()]; V+})$m*>
if(bRegistered){ LsMq&a-j2
DeleteHotkey(GetSafeHwnd(),cKey,cMask); WT 5 2
bRegistered=FALSE; tC+11M
} %&'[? LXD
cMask=mask; aJs! bx>K
cKey=key; A i#~Eu*
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); FhEfW7]0,
return bRegistered; [W'2z,S`WD
} ,4,./wIq
@Ko}Td&E(
四、小结 ! v%%_sRV
+WxD=|p;
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。