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:
HR>
X@ g<c
B,]:<1l~ 一、实现方法
K#LG7faj RlH~<|XK 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:
XJ.ERLR. .bT|:Q~@{ #pragma data_seg("shareddata")
\XUG-\$p HHOOK hHook =NULL; //钩子句柄
=%Yw;%0)Y UINT nHookCount =0; //挂接的程序数目
YhzDi>hob static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
-UhGacw static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
IRxFcLk static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
fjh0Z i45 static int KeyCount =0;
1 iWe&I: static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
8UANB]@Y} #pragma data_seg()
s7~[7
DwL4?!E 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。
; {P"~(S% Gw;[maM!%` 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:
<g^!xX<r? c_33.i"I} BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
jP-=x( cKey,UCHAR cMask)
o@d+<6Um {
q|[P[7z BOOL bAdded=FALSE;
hR] AUH for(int index=0;index<MAX_KEY;index++){
96&Y if(hCallWnd[index]==0){
hjgxCSp hCallWnd[index]=hWnd;
Fk 5; HotKey[index]=cKey;
V=C@ocyZ HotKeyMask[index]=cMask;
bLHj<AX#>| bAdded=TRUE;
9b0M'x'W5 KeyCount++;
\"r*wae break;
WG_20JdJY }
,3zF_y(*Y }
l5m5H,` return bAdded;
ARZ5r48)
}
-C7IUat< //删除热键
l u^fKQ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
nn"Wn2ciS {
#e!4njdM BOOL bRemoved=FALSE;
~4Gs\U:!Q for(int index=0;index<MAX_KEY;index++){
y,*>+xk, if(hCallWnd[index]==hWnd){
!"dbK'jb^ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
SQZUkKfb hCallWnd[index]=NULL;
-%U 15W; HotKey[index]=0;
||lI_B HotKeyMask[index]=0;
.o2]ndT/J bRemoved=TRUE;
iZVMDJ?(Z] KeyCount--;
U~mv1V^. break;
_V9 O,"DDc }
tkG0xRH }
H8ws6}C }
C XQPbt[5 return bRemoved;
4@wH4H8 }
2ja@NT M=!RJ%6f M#sDPT DLL中的钩子函数如下:
Y{ho[% ^Fl6-|^~ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
\qrSJ=}t {
1D0_k BOOL bProcessed=FALSE;
+b7}R7:AFH if(HC_ACTION==nCode)
WJ{hta {
U[$KQEJYj if((lParam&0xc0000000)==0xc0000000){// 有键松开
x=>+.'K switch(wParam)
">n38:?R {
l#FW#`f case VK_MENU:
vFK&63 MaskBits&=~ALTBIT;
:.-z) C} break;
6;lJs,I1w{ case VK_CONTROL:
+G!N@O MaskBits&=~CTRLBIT;
? 9.V@+i break;
p<|I!n&9 case VK_SHIFT:
_)7dy2%{q MaskBits&=~SHIFTBIT;
5pBQ~m3 break;
_u`NIpXSP default: //judge the key and send message
brkR,(#L3 break;
iI[Z|"a 21 }
*nB fF{y for(int index=0;index<MAX_KEY;index++){
!9!kb if(hCallWnd[index]==NULL)
-}lcMZY continue;
+$#YW5wy if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
'8NKrI {
1@nGD<,. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
%`%xD>![ bProcessed=TRUE;
O?8^I< }
{(7D=\eU }
uv++Kj! }
B/i` else if((lParam&0xc000ffff)==1){ //有键按下
gc:qqJi)X switch(wParam)
G\\zk {
e!wS"[, case VK_MENU:
E6SGK,f0D MaskBits|=ALTBIT;
7-M$c7S break;
Vrf+~KO7 case VK_CONTROL:
PMJe6*(x/ MaskBits|=CTRLBIT;
kO:iA0KUX break;
YC:>) case VK_SHIFT:
7@MGs2 MaskBits|=SHIFTBIT;
;SzOa7 break;
v hUn3|
default: //judge the key and send message
qy`95^ break;
# E'g{.N }
Jy'ge4]3 for(int index=0;index<MAX_KEY;index++){
@L%9NqE`O if(hCallWnd[index]==NULL)
R|T_9/#) continue;
M%wj6!5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
BJ3st {
29K09 0f SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
D?rQQxb bProcessed=TRUE;
R>"E Xq }
"
}@QL` }
E'=~<& }
@WX]K0$; if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
{m9OgR5U for(int index=0;index<MAX_KEY;index++){
4q)eNcs if(hCallWnd[index]==NULL)
9$,?Grw~ continue;
q P@4KH}e if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
DJeP] SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
+]Oq{v:e //lParam的意义可看MSDN中WM_KEYDOWN部分
oy!W$ ?6 }
W'\{8&:! }
"v-\nAu }
qoBm!|q return CallNextHookEx( hHook, nCode, wParam, lParam );
tw8@&8" }
yV:DR <CL0@?*i9 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"F5-s7 jxL5L[ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
byM/LE7) BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
\oPW Y%$57,Bu n 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
WlVC0& m,3?*0BMp= LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
cpB$b C]( {
1Y410-.3w{ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
S%b7NK {
x%ZjGDF m //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
"sz)~Q'W5 SaveBmp();
8#S|jBV return FALSE;
b0]y$*{j }
H~+D2A …… //其它处理及默认处理
"4LYqDe }
xtKWh`[& >Qc0g(w ?Zu=UVb 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
u0h {bu 2RKI M(~ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
g% :Q86u GmN} +( 二、编程步骤
|jW82L+!N% -san%H' 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
4E:HO\ ]yN]^%PYH 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
F#@Mf?#2
OWCd$c_( 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;
K z !-w p^+k:E>U 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;
MP?9k )f 1i9}mzy% 5、 添加代码,编译运行程序。
*&>1A A 8ON$M=Ze$ 三、程序代码
Oh<[8S7]C w-[WJ:2. ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
NA[yT #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
bF:vD&Sf #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
;}3wT,=sN #if _MSC_VER > 1000
2EsKC) #pragma once
qt+vmi+~ #endif // _MSC_VER > 1000
YMnG-'^Z #ifndef __AFXWIN_H__
$lci{D32, #error include 'stdafx.h' before including this file for PCH
7ZS5u+o #endif
*G$tfb( #include "resource.h" // main symbols
dc_^ class CHookApp : public CWinApp
UaCEh?D+Y {
wFpt#_fS public:
h<i.@& CHookApp();
TPp%II'* // Overrides
InMeD[*^ // ClassWizard generated virtual function overrides
DqrS5!C //{{AFX_VIRTUAL(CHookApp)
5KU}dw>*g public:
13s!gwE) virtual BOOL InitInstance();
I(/W+o virtual int ExitInstance();
-O3^q. //}}AFX_VIRTUAL
R>[2}R30 //{{AFX_MSG(CHookApp)
o87. ( // NOTE - the ClassWizard will add and remove member functions here.
?stx3sZ // DO NOT EDIT what you see in these blocks of generated code !
WA~|:S+ //}}AFX_MSG
bAt%^pc=y DECLARE_MESSAGE_MAP()
"ji4xy };
z?_c:]D LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
(L8H.|. BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
I-4csw<Qy BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
gIep6nq1`| BOOL InitHotkey();
' A= x BOOL UnInit();
k}l5v)m #endif
e{.2*>pH A/%K= H? //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
c[?S}u|[' #include "stdafx.h"
Nqp%Z7G #include "hook.h"
p0? XR #include <windowsx.h>
z}yntY]n #ifdef _DEBUG
c*K-?n9YMz #define new DEBUG_NEW
;%odN
d #undef THIS_FILE
3zY"9KUN static char THIS_FILE[] = __FILE__;
?s #DD, #endif
md_aD #define MAX_KEY 100
VR2BdfKU, #define CTRLBIT 0x04
i 4lR$]@ #define ALTBIT 0x02
15#v|/wI' #define SHIFTBIT 0x01
wqyx{W`~w #pragma data_seg("shareddata")
`4}zB#3 HHOOK hHook =NULL;
,*a8]L UINT nHookCount =0;
%Y:'5\^lC static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
>Be PE(k static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
<^|8\<J static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
3>yb$ZU"- static int KeyCount =0;
fyT:I6* static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Yn[y9;I{ #pragma data_seg()
8263
HINSTANCE hins;
A!H6$-W|p void VerifyWindow();
/"tVOv# BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
$}2m%$vJO //{{AFX_MSG_MAP(CHookApp)
K&<bn22 // NOTE - the ClassWizard will add and remove mapping macros here.
Wk$[;>NU3 // DO NOT EDIT what you see in these blocks of generated code!
'81$8xxdY //}}AFX_MSG_MAP
,sP7/S)FR END_MESSAGE_MAP()
qbu Lcy3 m*|3 CHookApp::CHookApp()
{l.) *#O {
'y}l9alF // TODO: add construction code here,
xKEHNgen // Place all significant initialization in InitInstance
h|m h_T{+ }
*5sr\b4#S "d/x`Dx CHookApp theApp;
B4pheKZ2 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
5G'X\iR {
}E[S%W[ BOOL bProcessed=FALSE;
tx}{E<\>$ if(HC_ACTION==nCode)
0!o&=Qh {
;n00kel$ if((lParam&0xc0000000)==0xc0000000){// Key up
[{ K$sd switch(wParam)
QL"fC;xUn, {
s{x2RDAt case VK_MENU:
&Ph@uZ\ MaskBits&=~ALTBIT;
B-|:l7
break;
YMj
z,N case VK_CONTROL:
ueDG1) MaskBits&=~CTRLBIT;
k]lM% break;
Cd#[b)d ?^ case VK_SHIFT:
FGG Fi( MaskBits&=~SHIFTBIT;
.T
L0cf To break;
&48wa^d default: //judge the key and send message
*I(>[m! break;
TjncW/\Z }
,;y5Mu8 for(int index=0;index<MAX_KEY;index++){
hZVF72D26 if(hCallWnd[index]==NULL)
UMpC2)5 continue;
:R{Xd{? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
HZ5*PXg~ {
`n
Y!nh6! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
eEb(TG~,Y bProcessed=TRUE;
c>:}~.~T }
1,T8@8# }
L0qo/6|C }
M['8zN else if((lParam&0xc000ffff)==1){ //Key down
@ T'!;) switch(wParam)
Dh BUMDoB {
;yqJEj_m( case VK_MENU:
=S4_^UY; MaskBits|=ALTBIT;
j5|PQOK break;
L10Vq}W" case VK_CONTROL:
q%bNT MaskBits|=CTRLBIT;
Uxn_nh break;
l6:k|hrm; case VK_SHIFT:
%L=roqz MaskBits|=SHIFTBIT;
_' Xt break;
R4 ;^R default: //judge the key and send message
u^s{r`/ break;
=&U JFu }
v2gK(&? for(int index=0;index<MAX_KEY;index++)
e!d&
#ofw| {
p
)etl5 if(hCallWnd[index]==NULL)
ba1zu|@w continue;
6vQAeuz<Fq if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
KVvIo1$N {
(zwxrOS SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
D@rOX (m bProcessed=TRUE;
i{I'+%~R }
*Tl"~)'t~ }
zq80}5%2CT }
RvZi %) if(!bProcessed){
7h<B:~(K for(int index=0;index<MAX_KEY;index++){
b&"=W9(V if(hCallWnd[index]==NULL)
BLgmFE2 continue;
>7!4o9)c if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
B%6>2S=E SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
T-xcd }
pR4{}=g, }
Yn+/yz5k_ }
X<Rh-1$8F return CallNextHookEx( hHook, nCode, wParam, lParam );
4};iL) }
Y\(Q q{n~v>wU BOOL InitHotkey()
|fYNkD8z1 {
w1KLQd:yq if(hHook!=NULL){
z2i?7)(?;A nHookCount++;
Fx~=mYU return TRUE;
cR 4xy26s }
W(E!: else
h$)!eSu hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
6k%N\!_TUW if(hHook!=NULL)
F[ N{7C3 nHookCount++;
W @Y$!V< return (hHook!=NULL);
\S[: }
j/TsHJ= BOOL UnInit()
-MbnYs) {
?5K.#>{ if(nHookCount>1){
FTI[YR8?Y nHookCount--;
rV<yM$IA return TRUE;
2P`hdg
}
36`aG Y BOOL unhooked = UnhookWindowsHookEx(hHook);
^2mmgN if(unhooked==TRUE){
/0s1q nHookCount=0;
"[L[*>[9! hHook=NULL;
;Z-xum{ }
3v
:PBmE return unhooked;
B'"C?d<7 }
wA|m/SZx *>n<7T0 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~P
1(%FZ {
K||9m+ BOOL bAdded=FALSE;
;J Dn1(6 for(int index=0;index<MAX_KEY;index++){
^*#5iT8/ if(hCallWnd[index]==0){
tj;<Z. hCallWnd[index]=hWnd;
NC)I u HotKey[index]=cKey;
z\*ii<-@ HotKeyMask[index]=cMask;
+yiGZV/X bAdded=TRUE;
rBye%rQRq KeyCount++;
1/c7((]7(, break;
'IY?7+[ }
<_=a1x }
P#\L6EO. return bAdded;
-^=gQ7f9 }
r"x|]nvg^ }o0R`15dA BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
i64a]= {
"1$OPt5 BOOL bRemoved=FALSE;
{(U?)4@ for(int index=0;index<MAX_KEY;index++){
8`Q8Mct$< if(hCallWnd[index]==hWnd){
q]T{g*lT if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
}i!hzkK# hCallWnd[index]=NULL;
F&<si:}KB HotKey[index]=0;
/B.\ 6 HotKeyMask[index]=0;
):;
&~ bRemoved=TRUE;
8G;
t[9 KeyCount--;
?DzKqsS' break;
x* *]@v"g }
cod__. }
hn{]Q@(I }
>0~|iRySi return bRemoved;
a FjcyD }
Ki(qA(r 5, R\tJCK void VerifyWindow()
fNPHc_?Ybj {
qX^#fk7] for(int i=0;i<MAX_KEY;i++){
N%v}$58Z if(hCallWnd
!=NULL){ \`}Rdr!p%
if(!IsWindow(hCallWnd)){ k"Y9Kc0XoU
hCallWnd=NULL; U']DB h
HotKey=0; |&eZ[Sy(=l
HotKeyMask=0; 8VQJUwf;
KeyCount--; Gu}|CFL\
} /.9j$iK#
}
;)s$Et%
} 3?iRf6;n
} E;.<'t>
~KHGh29
BOOL CHookApp::InitInstance() ,#hS#?t
{ OJPxV~y
AFX_MANAGE_STATE(AfxGetStaticModuleState()); }-?_c#G3
hins=AfxGetInstanceHandle(); t}>6"^}U
InitHotkey(); *%5.{J!
return CWinApp::InitInstance(); 3[B*l@}j
} C&YJvMu
|Wd]:ijJ
int CHookApp::ExitInstance() `9E:V=
{ @GDe{GG+
VerifyWindow(); h[b5"Uqj
UnInit(); @]P#]%^D2
return CWinApp::ExitInstance(); 3}e-qFlV8,
} CG*eo!Nw
};6[Byf
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file nAPSs]D
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {G&*\5W
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ $"1Unu&P
#if _MSC_VER > 1000 Aw9se"d
#pragma once =)5O(h
#endif // _MSC_VER > 1000 ((&_m9a
9g3e( z@
class CCaptureDlg : public CDialog rCU f,)
{ k ,wr6>'Vt
// Construction !`"@!
public: OFJ49X
BOOL bTray; Wj.f$U4
BOOL bRegistered; >a7OE=K
BOOL RegisterHotkey(); 8dgI&t
UCHAR cKey; !2R~/Rg
UCHAR cMask; Ss6mN;&D
void DeleteIcon(); ;U=IbK*
void AddIcon(); Bd jo3eX
UINT nCount; (8qD'(@
void SaveBmp(); piKYO+;W'
CCaptureDlg(CWnd* pParent = NULL); // standard constructor gw' uY$
// Dialog Data DjY&)oce(
//{{AFX_DATA(CCaptureDlg) z(b0U6)qQ
enum { IDD = IDD_CAPTURE_DIALOG }; j3 ,6UjlU
CComboBox m_Key; tkX7yg>`
BOOL m_bControl; *"Yz"PK
BOOL m_bAlt; ,rj_P
BOOL m_bShift; )d5Hv2/0
CString m_Path; Lf0Y|^!S_u
CString m_Number; 3Kuu9<0
//}}AFX_DATA hr3RC+ y
// ClassWizard generated virtual function overrides 2f>G
//{{AFX_VIRTUAL(CCaptureDlg) "[M,PI!B
public: Gu[G_^>
virtual BOOL PreTranslateMessage(MSG* pMsg); lz=$Dz
protected: LA &W@
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -kFEVJbUyc
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); WO$9Svh8
//}}AFX_VIRTUAL VqGmZ|+8
// Implementation Ey<vvZ
protected: ~Sy/q]4ys*
HICON m_hIcon; 5-'jYp/
// Generated message map functions P`r@<cgb=
//{{AFX_MSG(CCaptureDlg) #tX\m;
virtual BOOL OnInitDialog(); =v^LShD2^
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %+Hhe]J ld
afx_msg void OnPaint(); c6/+Ye =h
afx_msg HCURSOR OnQueryDragIcon(); Wy1#K)LRb
virtual void OnCancel(); XTboFrf
afx_msg void OnAbout(); E_sKD ybj
afx_msg void OnBrowse(); 7|Z=#3INw
afx_msg void OnChange(); 7Nx5n<
//}}AFX_MSG u&{}hv&FY
DECLARE_MESSAGE_MAP() \AFoxi2h
}; vEQw`OC
#endif %]NaHf
tuH8!.
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file #9{N[t
#include "stdafx.h" rXl ~D!
#include "Capture.h" 6&,n\EXF
#include "CaptureDlg.h" PF=BXY1<UL
#include <windowsx.h> A"|y<
#pragma comment(lib,"hook.lib") p5F=?*[}
#ifdef _DEBUG <X@XbM
#define new DEBUG_NEW pc9m,?n
#undef THIS_FILE i,#j@R@.C7
static char THIS_FILE[] = __FILE__; #?=?<"*j
#endif
W)F<<B,
#define IDM_SHELL WM_USER+1 f3 _-{<FZ
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %#5\^4$z|N
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R(YhVW_l
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; J-iFAKN
class CAboutDlg : public CDialog )v\zaz
{ Gg'sgn
public: 3JhT
CAboutDlg(); Vyy;mEBg
// Dialog Data 5:S=gARz
//{{AFX_DATA(CAboutDlg) OYnxEdo7
enum { IDD = IDD_ABOUTBOX }; o>Fc.$ngZ
//}}AFX_DATA RWyDX_z#<
// ClassWizard generated virtual function overrides O5rHN;\_
//{{AFX_VIRTUAL(CAboutDlg) VycCuq&M
protected: Q=B>Q
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4Js2/s
//}}AFX_VIRTUAL RbOEXH*]
// Implementation cV;<!f+
protected: VTS7K2lBvX
//{{AFX_MSG(CAboutDlg) 9, A(|g
//}}AFX_MSG =*paa
DECLARE_MESSAGE_MAP() +M )ep\j
}; (L`7-6e(Ab
Kjw==5)}
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) qDSZ:36
{ ENx1) ]
//{{AFX_DATA_INIT(CAboutDlg) ub/Z'!
//}}AFX_DATA_INIT `.oWmBey\
} )I~U&sT\/
o )\\(^ld
void CAboutDlg::DoDataExchange(CDataExchange* pDX) O_v8R7 {
{ +/"Ws'5E
CDialog::DoDataExchange(pDX);
IBP3
//{{AFX_DATA_MAP(CAboutDlg) pFB^l|\ ]
//}}AFX_DATA_MAP cy_'QS$W
} [w*t(A
s&Bk@a8
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) rC !!X
//{{AFX_MSG_MAP(CAboutDlg) @=i-*U
// No message handlers u92);1R
//}}AFX_MSG_MAP .qd/ft2
END_MESSAGE_MAP() seQSDCsvw*
t(~V:+W 9
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ot%^FvQ[c
: CDialog(CCaptureDlg::IDD, pParent) 9_=0:GHk
{ aNt+;M7g`
//{{AFX_DATA_INIT(CCaptureDlg) CBkI!
In2
m_bControl = FALSE; cj[a^ ZH
m_bAlt = FALSE; 4n9".UHh
m_bShift = FALSE; !O*'mX
m_Path = _T("c:\\"); `EBI$;!
m_Number = _T("0 picture captured."); %-nYK3
nCount=0; _cRCG1CJ
bRegistered=FALSE; st_.~m!/
bTray=FALSE; Xmmb^2I
//}}AFX_DATA_INIT ,(&p"O":
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 wOMrUWB0
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |\}&mBR
} ul@swp
f6of8BOg
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) b(E}W2-t
{ ^uWPbW&/q
CDialog::DoDataExchange(pDX); %#_"Ie
//{{AFX_DATA_MAP(CCaptureDlg) kA .U2
DDX_Control(pDX, IDC_KEY, m_Key); (&Kv]--
DDX_Check(pDX, IDC_CONTROL, m_bControl); m{v*\e7P
DDX_Check(pDX, IDC_ALT, m_bAlt); 5SB!)F]
DDX_Check(pDX, IDC_SHIFT, m_bShift); 2uCw[iZM
DDX_Text(pDX, IDC_PATH, m_Path); '3i,^g0?t0
DDX_Text(pDX, IDC_NUMBER, m_Number); ]2_b_ok
//}}AFX_DATA_MAP c 5%uiv]
} ~M c'~:{O
]NEr]sc-"F
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) S^8C\ E
//{{AFX_MSG_MAP(CCaptureDlg) VYR<x QA
ON_WM_SYSCOMMAND() 0I v(ioB=
ON_WM_PAINT() `i2:@?Kl9
ON_WM_QUERYDRAGICON() +UM%6Z=+
ON_BN_CLICKED(ID_ABOUT, OnAbout) VxP cC+
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) t6,bA1*5y
ON_BN_CLICKED(ID_CHANGE, OnChange) 8mm]>u$
//}}AFX_MSG_MAP =K\xE"
END_MESSAGE_MAP() !&eKq?P{j
7Mj:bm&9
BOOL CCaptureDlg::OnInitDialog() o){\qhLp
{ {py"Ob_
CDialog::OnInitDialog(); {`ghX%M(l
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); YAdk3y~pL
ASSERT(IDM_ABOUTBOX < 0xF000); /g`!Zn8a
CMenu* pSysMenu = GetSystemMenu(FALSE); & FpoMW
if (pSysMenu != NULL) /Kd9UQU
{ ?~:4O}5Ax
CString strAboutMenu; uGc0Lv4i/
strAboutMenu.LoadString(IDS_ABOUTBOX); 1PN!1= F}
if (!strAboutMenu.IsEmpty()) 3|0wD:Dy
{ @zCp/fo3
pSysMenu->AppendMenu(MF_SEPARATOR); d :vuRK4+
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); S{Q2KD
} 7WMF8(j5
} nb~592u
SetIcon(m_hIcon, TRUE); // Set big icon U [R[VY7
SetIcon(m_hIcon, FALSE); // Set small icon f=EWr8mno
m_Key.SetCurSel(0); Ql1J?9W
RegisterHotkey(); '8"nXuL-
CMenu* pMenu=GetSystemMenu(FALSE); eY V Jk7
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Ylhy Z&a,
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); zl3GWj|?\7
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); u~~H'*EM
return TRUE; // return TRUE unless you set the focus to a control =j"bLX6;
} _2a)b(<tF
\zT{zO&!
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) KaIkO8Dq0
{ ~( ;HkT
if ((nID & 0xFFF0) == IDM_ABOUTBOX) aN;c.1TY
{ -`A+Qp)
CAboutDlg dlgAbout; 8yC/:_ML
dlgAbout.DoModal(); hDf!l$e.
} *}'3|e4w}
else Qx_]oz]NY
{ }Pm;xHnf&
CDialog::OnSysCommand(nID, lParam); S8,e`F
} pSl4^$2XR
} u_=^Bd
_u9bZ'
void CCaptureDlg::OnPaint() rU
|%
{ 3^,p$D<T:,
if (IsIconic()) "!9FJ Y
{ U1)!X@F{
CPaintDC dc(this); // device context for painting =&" a:l
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,ll<0Atg
// Center icon in client rectangle bIXD(5y
int cxIcon = GetSystemMetrics(SM_CXICON); RgD %pNhI
int cyIcon = GetSystemMetrics(SM_CYICON); 3(,c^F
CRect rect; bs_< UE
GetClientRect(&rect); ;r BbLM`
int x = (rect.Width() - cxIcon + 1) / 2; FmhT^
int y = (rect.Height() - cyIcon + 1) / 2; 4g)$(5jI}
// Draw the icon !DkIM}.
dc.DrawIcon(x, y, m_hIcon); }a"koL
} 4d8}g25C
else +&4@HHU{G
{ &U_T1-UR2
CDialog::OnPaint(); mM2DZ^"j(
} FM"[:&>
} 1l s 8 h
oi7Y?hTj
HCURSOR CCaptureDlg::OnQueryDragIcon() LYke\/ md
{ +62}//_?
return (HCURSOR) m_hIcon; (,R\6
} c{3P|O&.
U.Fs9F4M #
void CCaptureDlg::OnCancel() F*JbTEOn
{ jGUegeq
if(bTray) b=kY9!GN,v
DeleteIcon(); 4*9BAv
CDialog::OnCancel(); "#8I &xZK
} zXW;W$7V4
Dn48?A[v
void CCaptureDlg::OnAbout() MP
p
{ |)OC1=As
CAboutDlg dlg; Ie}7#>S
dlg.DoModal(); rrSFmhQUk
} ^[VEr"X
e\._M$l
void CCaptureDlg::OnBrowse() K_fJ{Vc>O
{ Flaqgi/j
CString str; \rY\wa
BROWSEINFO bi; e>Dux
char name[MAX_PATH]; E %?>
%h
ZeroMemory(&bi,sizeof(BROWSEINFO)); Xdh@ ^`
bi.hwndOwner=GetSafeHwnd(); r_MP[]f|0
bi.pszDisplayName=name; +4F; m_G6
bi.lpszTitle="Select folder"; _^D -nk?
bi.ulFlags=BIF_RETURNONLYFSDIRS; rX22%~1
LPITEMIDLIST idl=SHBrowseForFolder(&bi); y]g5S-G
if(idl==NULL) `('NH]^
return; l%qfaU2
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ckhwd
str.ReleaseBuffer(); AZ
SaI
m_Path=str; JyePI:B&)j
if(str.GetAt(str.GetLength()-1)!='\\') L7"<a2J
m_Path+="\\"; C'PHbo:
UpdateData(FALSE); lNMJcl3
} s$~H{za
`)NTJc$):
void CCaptureDlg::SaveBmp() CdKs+x&tZ
{ TA+#{q+a
CDC dc; SduUXHk
dc.CreateDC("DISPLAY",NULL,NULL,NULL); f\;f&GI
CBitmap bm; m4^VlE,`Dh
int Width=GetSystemMetrics(SM_CXSCREEN); 4{h^O@*g
int Height=GetSystemMetrics(SM_CYSCREEN); p7L6~IN
bm.CreateCompatibleBitmap(&dc,Width,Height); C't%e
CDC tdc; 6n/KL
tdc.CreateCompatibleDC(&dc); rS0#]Gg
CBitmap*pOld=tdc.SelectObject(&bm); Hp@cBj_@P2
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *f SX3Dk
tdc.SelectObject(pOld); `(]mUW
BITMAP btm; @ev^e!B
bm.GetBitmap(&btm); PiLLUyQx
DWORD size=btm.bmWidthBytes*btm.bmHeight; (L!u[e0[#
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); _zLEHEZ-
BITMAPINFOHEADER bih; ie/QSte
bih.biBitCount=btm.bmBitsPixel; N@"e^i
bih.biClrImportant=0; *7qa]i^]
bih.biClrUsed=0; )O\l3h"
bih.biCompression=0; n65fT+;
bih.biHeight=btm.bmHeight; JEfhr
bih.biPlanes=1; 7o-}86x#
bih.biSize=sizeof(BITMAPINFOHEADER); J?Rp
bih.biSizeImage=size; Up>,~bs]
bih.biWidth=btm.bmWidth; #+^l3hMK
bih.biXPelsPerMeter=0; qz 29f
bih.biYPelsPerMeter=0; hDbZ62DDN
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1?r$Rx<R
static int filecount=0; |[!0ry*N%
CString name; hP/uS%X
name.Format("pict%04d.bmp",filecount++); <JZa
name=m_Path+name; (CE2]Nv9")
BITMAPFILEHEADER bfh; .yb8<q s
bfh.bfReserved1=bfh.bfReserved2=0; tfv@
)9
bfh.bfType=((WORD)('M'<< 8)|'B'); fVq,?
bfh.bfSize=54+size; YGi_7fTyc=
bfh.bfOffBits=54; cSj(u%9}
CFile bf; SNV;s,
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ">s0B5F7
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); kEg~yN
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !zxq9IhWR
bf.WriteHuge(lpData,size); R~bLEo
bf.Close(); tOPkx(
nCount++; d%Ku'Jy
} obw:@i#
GlobalFreePtr(lpData); 'IER9%V$
if(nCount==1) wDs#1`uTq
m_Number.Format("%d picture captured.",nCount); #|lVQ@=
else QYWl`Yqf
m_Number.Format("%d pictures captured.",nCount); $'lJ_jL
UpdateData(FALSE); K$M,d-
`b
} vw` '9~
3iiOxg?j
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 94XRf"^
{ )
|hHbD^V
if(pMsg -> message == WM_KEYDOWN) i{PX=
{ s'@@q
if(pMsg -> wParam == VK_ESCAPE) 7p18;Z+6>X
return TRUE; *kDV ^RBfq
if(pMsg -> wParam == VK_RETURN) <pUc(
tPoz
return TRUE; j MA%`*r
} _[
`"E'
return CDialog::PreTranslateMessage(pMsg); 98WJ"f_ #
} <zu)=W'R]
UOIZ8Po
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Rh7=,=u
{ taOsC!Bp
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,I[A~
SaveBmp(); 8\Eq(o}7
return FALSE; 5?|PC.
} .T*7nw
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ CY9`HQ1
CMenu pop; FD}>}fLv
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); g/,O51f'
CMenu*pMenu=pop.GetSubMenu(0); J15$P8J
pMenu->SetDefaultItem(ID_EXITICON); dk2o>jI4;
CPoint pt; SiJX5ydz
GetCursorPos(&pt); q}5&B=2pM
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); PiIILX{DuH
if(id==ID_EXITICON) /XW,H0pR
DeleteIcon(); 2qkC{klC^M
else if(id==ID_EXIT) o6;VrpaNi
OnCancel(); GG_A'eX:I
return FALSE; z~a]dMs"(P
} U0S}O(Ptr
LRESULT res= CDialog::WindowProc(message, wParam, lParam); z9KsSlS ^
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) d>7bwG+k
AddIcon(); g:c
@
return res; Th*mm3D6
} %n#^#:
RrqZ5Gonj
void CCaptureDlg::AddIcon() 'w7{8^Z2
{ {EupB?
NOTIFYICONDATA data; 8|,-P=%t
data.cbSize=sizeof(NOTIFYICONDATA); ';7|H|,F
CString tip; 8 _[f#s`)
tip.LoadString(IDS_ICONTIP); Qod2m$>wp}
data.hIcon=GetIcon(0); >Y/1%Hp9
data.hWnd=GetSafeHwnd(); z'X_s.9F
strcpy(data.szTip,tip); :ui1]its4
data.uCallbackMessage=IDM_SHELL; N:/$N@"Ge
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ) uyh
data.uID=98; y/2U:H
Shell_NotifyIcon(NIM_ADD,&data); 'lNl><e-
ShowWindow(SW_HIDE); 7f
td2lv
bTray=TRUE; X]*W +
} k
.l,>s`!
@.iOFY
void CCaptureDlg::DeleteIcon() >heih%Ar0J
{ rQ$A|GJ L
NOTIFYICONDATA data; JGD{cr[S
data.cbSize=sizeof(NOTIFYICONDATA); !ZV#~t:)
data.hWnd=GetSafeHwnd(); O"9f^y*
data.uID=98; HIeMV,.QN
Shell_NotifyIcon(NIM_DELETE,&data); }Mo9r4}
ShowWindow(SW_SHOW); %jM|*^\%
SetForegroundWindow(); c#;LH5KI
ShowWindow(SW_SHOWNORMAL); "Hjw
bTray=FALSE; cw <DM%p
} HwSPOII|8K
n*6',BY
void CCaptureDlg::OnChange() fhn0^Qc"+
{ Tm^zoVi
RegisterHotkey(); AjANuyUaP
} Fk(0q/b
z_l3=7R
BOOL CCaptureDlg::RegisterHotkey() [l5"'{x
{ ?\F ,}e
UpdateData(); qkUr5^1
UCHAR mask=0; @+X}O/74
UCHAR key=0; r5iO%JFg
if(m_bControl) I}v'n{5(
mask|=4; )3B5"b,
if(m_bAlt) rb\Ohv\
mask|=2; ?3z+|;t6C
if(m_bShift) 3]Lk}0atpL
mask|=1; TzL40="F
key=Key_Table[m_Key.GetCurSel()]; W@$p'IBwm
if(bRegistered){ D+o.9I/{
DeleteHotkey(GetSafeHwnd(),cKey,cMask); O\KAvoQ%s
bRegistered=FALSE; c)6Y.[).
} X-{:.9
cMask=mask; o>`/,-!
cKey=key; Dfhs@ z
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); '7*=m^pc
return bRegistered; 1v\-jM"
} M*S5&xpX
fp![Pbms.
四、小结 Z%OS W
>;3c;nf
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。