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:
*I`Sc|A
C&bw1`XJf 一、实现方法
yTz@q>6s- *;Dd:D9 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:
1s-k=3) x6* {@J&5* #pragma data_seg("shareddata")
Pr{? A]dQ HHOOK hHook =NULL; //钩子句柄
?Bq"9*q UINT nHookCount =0; //挂接的程序数目
'j !!h4 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
sDK
lbb static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
P_j?V"i< static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
[^A.$, static int KeyCount =0;
Jn +[:s. static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
^ox^gw) #pragma data_seg()
7e/Uc!&* 1B+MCt4 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
Zd1+ZH /[Vaf R! DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
!
o:m*: M-K<w(,X BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
'C1=(PE%` cKey,UCHAR cMask)
=<_xUh. {
Ra'0 ^4t BOOL bAdded=FALSE;
K0@2>nR for(int index=0;index<MAX_KEY;index++){
eQx9Vnb if(hCallWnd[index]==0){
@(JcM= hCallWnd[index]=hWnd;
iH#~eg HotKey[index]=cKey;
VFT
G3,kI HotKeyMask[index]=cMask;
+&jWM-T"- bAdded=TRUE;
R<Ojaj=V KeyCount++;
9.qI hg break;
>>rW-& }
?t'ZX~k }
3q R@$pm return bAdded;
?O8NyCeb7 }
02Ur'| //删除热键
ME[Wg\ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
w
(W+Y+up {
gAhCNOp BOOL bRemoved=FALSE;
@X>k@M for(int index=0;index<MAX_KEY;index++){
^b~&}uU if(hCallWnd[index]==hWnd){
Kf76./ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
b3wE8Co hCallWnd[index]=NULL;
$)mq HotKey[index]=0;
%.r{+m HotKeyMask[index]=0;
a^'1o9 bRemoved=TRUE;
$yIcut7 KeyCount--;
S6B(g_D| break;
k;3Bv 6 }
GfUIF]X }
&32qv`
V_ }
;DL|%-%;$r return bRemoved;
b,Ed}Ir }
}9R45h}{< nZfTK>)A0 6dV@.(][a DLL中的钩子函数如下:
xrA(#\}f$ KZ6}),p LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
j1N1c~2 {
';+; BOOL bProcessed=FALSE;
nSz Fs(]f if(HC_ACTION==nCode)
g(33h2" {
D7X-|`kH if((lParam&0xc0000000)==0xc0000000){// 有键松开
`.
/[/z-g switch(wParam)
X"(!\{ySI; {
I--WS[ case VK_MENU:
*;7& MaskBits&=~ALTBIT;
r62x*?/ break;
gd_w;{WP case VK_CONTROL:
NZe3
m MaskBits&=~CTRLBIT;
?Mp~^sgp' break;
!3DWz6u case VK_SHIFT:
2}'qu) MaskBits&=~SHIFTBIT;
qDqIy+WR break;
b+'G^!JR default: //judge the key and send message
+e)So+.W break;
qlIC{:E0 }
/&$'v:VB for(int index=0;index<MAX_KEY;index++){
U)zd~ug?m if(hCallWnd[index]==NULL)
R$K.; continue;
7,!Mmu if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=jkC]0qx
{
aj20, w SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
R)I 8 ) bProcessed=TRUE;
^8o'\V"m^ }
/1h`O@VA }
>f^&^28 }
<.HHV91 else if((lParam&0xc000ffff)==1){ //有键按下
kN`[Q$B switch(wParam)
r%xp^j} {
\u2K?wC case VK_MENU:
{dg3 qg~ MaskBits|=ALTBIT;
z<+".sD' break;
oZ& ns!# case VK_CONTROL:
J@oGAa%3) MaskBits|=CTRLBIT;
@@*-> break;
fg8V6FS case VK_SHIFT:
6^wg'u]c MaskBits|=SHIFTBIT;
9HLn_|yU break;
ci+Pg9sS default: //judge the key and send message
Q0gO1T break;
[p$b@og/> }
,vrdtL for(int index=0;index<MAX_KEY;index++){
`V w9j,G if(hCallWnd[index]==NULL)
3rZFN^ continue;
Fw+JhIVP if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
hAOXOj1 {
+IuV8XT2( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
k!xi
(l<C bProcessed=TRUE;
zek\AQN }
,4NvD2Y }
OZbwquF@ }
elWN-~ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
6[69|& for(int index=0;index<MAX_KEY;index++){
enF.}fo] if(hCallWnd[index]==NULL)
Z"lL=0rY/ continue;
\C
ZiU3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
?fXg_?+{'g SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
.!U `,)I //lParam的意义可看MSDN中WM_KEYDOWN部分
XU2HWa }
=P'=P0G }
!}"npUgE }
!__f return CallNextHookEx( hHook, nCode, wParam, lParam );
Umv_{n` }
;G0~f9 S5"xb 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,mFme H$Q$3Q!` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Y5-X)f BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
'an{<82i b/"gkFe# 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
<s9Sx>Zb W$EX6jTGI LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
K
*{C:Y {
m/0G=%d%k if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
g"2@E {
*Sz`=U7n //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
:B$=Pp1 SaveBmp();
[_|iW%<` return FALSE;
KAgiY4 }
ZZ!d:1'7 …… //其它处理及默认处理
zO2<Igb }
5>j,P nkS6A}i3o r4J4|&ym 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
#E^ %h pP{b!1 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
e:AB!k^xp$ xE9^4-Px* 二、编程步骤
FDbx"%A /{>ds-;- 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";
,PJl32
S^I38gJd 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
qI<*Cze eY\tO"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;
:lgIu . \Y>^L{ 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;
I4m)5G?O2 ;r49H<z 5、 添加代码,编译运行程序。
d;D^<-[i q1r\60M 三、程序代码
[mw#a9 /%=#*/E7 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Bpo~x2p #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
j[iJo
5 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
U,RIr8 G #if _MSC_VER > 1000
Kl(}s{YFn. #pragma once
]K XknEaxl #endif // _MSC_VER > 1000
0 v/+%%4} #ifndef __AFXWIN_H__
d^ipf*aLC #error include 'stdafx.h' before including this file for PCH
A
|NX" #endif
OTN"XKa$ #include "resource.h" // main symbols
U=Z@Ipu5T class CHookApp : public CWinApp
'!yyg# {
b2U[W# public:
(niZN_qv CHookApp();
9^igzRn0 // Overrides
8uyVx9C0 // ClassWizard generated virtual function overrides
Gg5vf]VFo //{{AFX_VIRTUAL(CHookApp)
FE M_7M public:
QHP^1W` virtual BOOL InitInstance();
gJs~kQU virtual int ExitInstance();
`'0opoQRe //}}AFX_VIRTUAL
Y)BKRS~ //{{AFX_MSG(CHookApp)
5kC#uk // NOTE - the ClassWizard will add and remove member functions here.
t,k9:p // DO NOT EDIT what you see in these blocks of generated code !
D@DK9?# //}}AFX_MSG
dH?pQ
DECLARE_MESSAGE_MAP()
uBl&|yvxB };
b.YQN' LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
k^R>x V
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
vk{4:^6.TV BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
)byQ=-<1 BOOL InitHotkey();
jG)>{D BOOL UnInit();
_'2r=a#` #endif
A<>W^ow o }Tv^>L //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
~{2@-qcm #include "stdafx.h"
/%)MlG #include "hook.h"
XKks j!'B #include <windowsx.h>
`+"QhQ4w #ifdef _DEBUG
KO{}+~,.6 #define new DEBUG_NEW
Kz$Ijj #undef THIS_FILE
+Tq
_n@ static char THIS_FILE[] = __FILE__;
xU@Z<d,k #endif
#Sn&Wo #define MAX_KEY 100
"_?^uymw #define CTRLBIT 0x04
S'ikr #define ALTBIT 0x02
7-^df0 #define SHIFTBIT 0x01
<408lm #pragma data_seg("shareddata")
~ikTo - HHOOK hHook =NULL;
I62Yg
p$K UINT nHookCount =0;
P-+ ^YN, static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
;R2(Gb static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
C$,S#n@ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
nr s!e static int KeyCount =0;
E62*J$wN@ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
TuaT-Z~U{ #pragma data_seg()
zYls>fbp, HINSTANCE hins;
r9b`3yr= void VerifyWindow();
K''b)v X4 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
S G43} //{{AFX_MSG_MAP(CHookApp)
)>TA|W]@ // NOTE - the ClassWizard will add and remove mapping macros here.
!u7WCw.D m // DO NOT EDIT what you see in these blocks of generated code!
_`D760q} //}}AFX_MSG_MAP
ef!I |.FW END_MESSAGE_MAP()
2{U4wTu N3x}YHFF CHookApp::CHookApp()
W_iP/xL {
>"`:w
// TODO: add construction code here,
]^ RgzK // Place all significant initialization in InitInstance
Nk=M }
d^lA52X6P F},JP'\X CHookApp theApp;
ZO}V}3 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
-09<; U {
|/p^e BOOL bProcessed=FALSE;
3%cNePlr if(HC_ACTION==nCode)
x; b'y4kH {
sjaG%f&h if((lParam&0xc0000000)==0xc0000000){// Key up
5R o5Cg~ switch(wParam)
yM\1n {
8,B9y D case VK_MENU:
Nc;7KMOIA MaskBits&=~ALTBIT;
](Sp0t break;
P!]DV$o case VK_CONTROL:
8,['q~z MaskBits&=~CTRLBIT;
FEdyh?$ break;
c)E'',-J_2 case VK_SHIFT:
j&44wuf MaskBits&=~SHIFTBIT;
B\<zU break;
9cj=CuE default: //judge the key and send message
2V~Yb1P break;
%mxG;w$ }
$}HSU>,% for(int index=0;index<MAX_KEY;index++){
W?6RUyMC$T if(hCallWnd[index]==NULL)
+ x4o# N continue;
%/sf#8^m if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ryPz?Aw(4 {
bgEUG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
y-Z*qR? bProcessed=TRUE;
M4DRG%21 }
L[O+9Yh }
-2Ub'*qK }
9I
pjY~or
else if((lParam&0xc000ffff)==1){ //Key down
+VU,U`W switch(wParam)
+, PBhB {
.WtaU case VK_MENU:
v$,9l+p/ MaskBits|=ALTBIT;
5gEUE {S break;
!hJKI.XH case VK_CONTROL:
,:;_j<g`e MaskBits|=CTRLBIT;
xQ$*K]VP break;
w>m/c1 case VK_SHIFT:
4~1_%wb MaskBits|=SHIFTBIT;
T?% F break;
_{ ?1+ default: //judge the key and send message
cFuvi^n\ break;
6lZhV[~Z/ }
C\fc 4 for(int index=0;index<MAX_KEY;index++)
*[ A%tj% {
zIm$S/Qe* if(hCallWnd[index]==NULL)
ea B-u continue;
?(R6}ab>K7 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
) tsaDG-E {
e`C'5`d] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Bj\0RmVa1 bProcessed=TRUE;
%tpt+N? }
h#`qEK&u }
,AM6E63 }
.}z&$:U9[ if(!bProcessed){
5[;p<GqGN for(int index=0;index<MAX_KEY;index++){
JEBx|U$'Y if(hCallWnd[index]==NULL)
VT-&"Jn continue;
KDCq::P< if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ybB/sShGM SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
8"p>_K= }
r$0"Y-a }
H!vvdp?Z }
>Y[{m $- return CallNextHookEx( hHook, nCode, wParam, lParam );
!O $EVl }
IY :iGn8R 9i9VDk{ BOOL InitHotkey()
D^f;dT;- {
fxyPh if(hHook!=NULL){
lN^L#m*@ nHookCount++;
.|_+>){$w return TRUE;
rK"$@tc }
F
lbL`@4M else
JQ0KXS Nr hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
YK_a37E{F if(hHook!=NULL)
LQR9S/?Ld nHookCount++;
p+yU!Qj return (hHook!=NULL);
tn:9 }
69CH W & BOOL UnInit()
V!~uGf {
W;,Jte<'Nm if(nHookCount>1){
KcY 2lTvx nHookCount--;
jaNkWTm: return TRUE;
"X}!j>- }
[}+
MZ BOOL unhooked = UnhookWindowsHookEx(hHook);
(bZ)pW/iw if(unhooked==TRUE){
GyT{p#l nHookCount=0;
L5PN]<~T hHook=NULL;
P 7gS
M }
JYKaF6bx8 return unhooked;
0oM~e }
}CQ GvH iF<VbQP=X^ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
<A!v'Y {
jcevpKkRG BOOL bAdded=FALSE;
#,GpZ for(int index=0;index<MAX_KEY;index++){
q.rn ZU if(hCallWnd[index]==0){
&9TG&~(+ hCallWnd[index]=hWnd;
g$$uf[A-SL HotKey[index]=cKey;
lE%0ifu HotKeyMask[index]=cMask;
22(0Jb\_ bAdded=TRUE;
\{abyi; KeyCount++;
2<|+h=
& break;
py@5]n% }
Xgop1 }
<.RgMPi return bAdded;
r;}kw(ukC }
&OWiA;e?f FFP>Y*v( BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~`
#t?1SP {
op[OB= BOOL bRemoved=FALSE;
?JtFiw for(int index=0;index<MAX_KEY;index++){
Wh 8fC(BE if(hCallWnd[index]==hWnd){
eWcS>N if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
e7 5*84 hCallWnd[index]=NULL;
"y>l2V,4j% HotKey[index]=0;
-/KVZ HotKeyMask[index]=0;
2hu;N bRemoved=TRUE;
:DQHb"( KeyCount--;
(x#4BI}L9) break;
mp!6MO Q }
n T\W| }
C:$ l H }
1R1J/Z*V/ return bRemoved;
mu|#(u }
G#n27y nh Bd)Qz(>rw void VerifyWindow()
i]xyD '0 {
Exk[;lI for(int i=0;i<MAX_KEY;i++){
t\u0\l> if(hCallWnd
!=NULL){ lSl=6R
if(!IsWindow(hCallWnd)){ > : \lDz
hCallWnd=NULL; '$4o,GA8
HotKey=0; P\N$TYeH
HotKeyMask=0; +'Tr>2V
KeyCount--; JdFMSmZ@
} u;;]S!:M
} ~Ui<y=d
} g]z,*d
} vU&gFEWg
`q%Z/!}
BOOL CHookApp::InitInstance() M}3>5*!=
{ H?UmHwwE
AFX_MANAGE_STATE(AfxGetStaticModuleState()); vsHY; [
hins=AfxGetInstanceHandle(); o#H"tYP
InitHotkey(); g:O~1jq
return CWinApp::InitInstance(); ImyB4welo
} j<wWPv
KS3
/
int CHookApp::ExitInstance() YD7i6A
{ v-_K'm
VerifyWindow(); h#'(UZ
UnInit(); <~vamim#K
return CWinApp::ExitInstance(); mgh,)=2cE(
} B k#68p
}(O
7tC
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file l[L\|hv'n
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;40!2P8t
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @kRe0:t
#if _MSC_VER > 1000 jQC6N#L
#pragma once 4Poi:0oOys
#endif // _MSC_VER > 1000 _`*x}
97NF*-)N
class CCaptureDlg : public CDialog k9'%8(7M:
{ 8cF-kfbfZ
// Construction tDF6%RG
public: ``$At ,m
BOOL bTray; *5.s@L( VU
BOOL bRegistered; C3hnX2";
BOOL RegisterHotkey(); ,]42v?
UCHAR cKey; 91}QuYv/_
UCHAR cMask; ! E#XmYhX=
void DeleteIcon(); bu,Z'
void AddIcon(); VQ{}S $jQ
UINT nCount; thl{IU
void SaveBmp(); # ]&=]K1V
CCaptureDlg(CWnd* pParent = NULL); // standard constructor <Y9((QSM4
// Dialog Data <s)+V6\E
//{{AFX_DATA(CCaptureDlg) FsTE.PT
enum { IDD = IDD_CAPTURE_DIALOG }; qun#z$
CComboBox m_Key; $xa#+
BOOL m_bControl; 7V%}U5
BOOL m_bAlt; CKmoC0.
BOOL m_bShift; MjQKcL4%7
CString m_Path; Vq -!1.v3
CString m_Number; rwv_
RN
//}}AFX_DATA 2.Th29]
// ClassWizard generated virtual function overrides tB8XnO_c
//{{AFX_VIRTUAL(CCaptureDlg) K q: +{'
public: H&6lQ30/)
virtual BOOL PreTranslateMessage(MSG* pMsg); _t'Kj\
protected: #Kn=Q
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4\Mh2z5
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); '9H7I! L@
//}}AFX_VIRTUAL w%GEOIj}
// Implementation BO5F6lyQ0P
protected: fXS4&XU
HICON m_hIcon; )PVX)2P_C
// Generated message map functions A d=NJhzl
//{{AFX_MSG(CCaptureDlg) # G0jMQ
virtual BOOL OnInitDialog(); GCkc[]2p
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {ckA
afx_msg void OnPaint(); pMHY2t
afx_msg HCURSOR OnQueryDragIcon(); /g< T)$2
virtual void OnCancel(); ]<WKi=
afx_msg void OnAbout(); L*6Tz'Qp
afx_msg void OnBrowse(); s,\!@[N
afx_msg void OnChange(); 5YQ4]/h
//}}AFX_MSG t.v@\[{-
DECLARE_MESSAGE_MAP() V)^nVD)e
}; Q>cLGdzO
#endif 5#!pwjt~7
,/BBG\mJ
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file vClD)Ar
#include "stdafx.h" !ANv XPp
#include "Capture.h" =mxmJFA
#include "CaptureDlg.h" lBvQ?CJ<y
#include <windowsx.h> WFocA:
#pragma comment(lib,"hook.lib") ff**) Xdh
#ifdef _DEBUG Q|rrbx b
#define new DEBUG_NEW EGf9pcUEO&
#undef THIS_FILE %u-l6<w#R
static char THIS_FILE[] = __FILE__; Mf^ ;('~
#endif 4Cr|]o'
#define IDM_SHELL WM_USER+1 M;ac U~J
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); L&+XFntR
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]O3[Te
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +O`0Mc$%'
class CAboutDlg : public CDialog UxzZr%>s
{ #(FG+Bk
public: 2~AGOx
CAboutDlg(); c!AGKc
// Dialog Data ~T7\lJ{%G
//{{AFX_DATA(CAboutDlg) D0/ \
enum { IDD = IDD_ABOUTBOX }; /[`bPKr
//}}AFX_DATA i|0H {q
// ClassWizard generated virtual function overrides 2u4aCfIx
//{{AFX_VIRTUAL(CAboutDlg) |_{-hNiz0
protected: y,v*jE
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Lj6$?(x}
//}}AFX_VIRTUAL ~rN~Ql%S
// Implementation GxL5yeN@(
protected: #uVH~P5TM
//{{AFX_MSG(CAboutDlg) `%EMhk
//}}AFX_MSG BX;Z t9"*
DECLARE_MESSAGE_MAP() .-T^S"`d|
}; LSv0zAIe/
j
yR9a!
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
#lRkp.e
{ )=V0
//{{AFX_DATA_INIT(CAboutDlg) %,Xs[[?i
//}}AFX_DATA_INIT N%'=el4L
} *aT3L#0(
'z0@|a
void CAboutDlg::DoDataExchange(CDataExchange* pDX) LRW7_XYz
{ hJ 4]GA'
CDialog::DoDataExchange(pDX); 6":=p:PT.
//{{AFX_DATA_MAP(CAboutDlg) r 'wam]1Z
//}}AFX_DATA_MAP ]fg?)z-Z
} [H$rdh[+
*[t@j*al
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Q9=X|
//{{AFX_MSG_MAP(CAboutDlg) ~]a:9Ev*
// No message handlers |f;u5r!^=
//}}AFX_MSG_MAP Xs$k6C3
END_MESSAGE_MAP() \2~Cn c*O
v@TP_Ka
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) y[BUWas(
: CDialog(CCaptureDlg::IDD, pParent) jk,:IG
{ Eqj&SA
//{{AFX_DATA_INIT(CCaptureDlg) /DA'p [,
m_bControl = FALSE; ,{MA90!
m_bAlt = FALSE; T|`nw_0
m_bShift = FALSE; E+k#1c|v$
m_Path = _T("c:\\"); g+|1khS)
m_Number = _T("0 picture captured."); fl*]ua
nCount=0; 7'uuc]\5>
bRegistered=FALSE; *oqQ=#\
bTray=FALSE; m~mw1r
//}}AFX_DATA_INIT ,r!_4|\
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $e1==@
R
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); a[bu{Z]%
} 42kr&UY&
& F\HR
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2'UWPZgE
{ Sa7bl~p\
CDialog::DoDataExchange(pDX); ('QfB<4H1
//{{AFX_DATA_MAP(CCaptureDlg) `2Rd=M]?
DDX_Control(pDX, IDC_KEY, m_Key); U<QO@5
DDX_Check(pDX, IDC_CONTROL, m_bControl); U0G(
DDX_Check(pDX, IDC_ALT, m_bAlt); (+lwt
DDX_Check(pDX, IDC_SHIFT, m_bShift); qKag'0e
DDX_Text(pDX, IDC_PATH, m_Path); >J,Rx!fq3
DDX_Text(pDX, IDC_NUMBER, m_Number);
'|V"!R)
//}}AFX_DATA_MAP ,\ [R\s
} YMx]i,u'+
f-&4x_5
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Q]wM WV
//{{AFX_MSG_MAP(CCaptureDlg) &6V[@gmD
ON_WM_SYSCOMMAND() <XG&f
ON_WM_PAINT() P Llad\
ON_WM_QUERYDRAGICON() |Am
+f.
ON_BN_CLICKED(ID_ABOUT, OnAbout) 3.>M=K~09
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ?o307r
ON_BN_CLICKED(ID_CHANGE, OnChange) _{0'3tI7
//}}AFX_MSG_MAP 5jAiqJq~y:
END_MESSAGE_MAP() [S;ceORx
w ;+x g
BOOL CCaptureDlg::OnInitDialog() 1'ts>6b
{ +Q pgG4h
CDialog::OnInitDialog(); t[/WGF&(R
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =?hGa;/rb
ASSERT(IDM_ABOUTBOX < 0xF000); },<(VhP
CMenu* pSysMenu = GetSystemMenu(FALSE); %X)w$}WH
if (pSysMenu != NULL) Q'D%?Vg'
{ 6jz6
CString strAboutMenu; xe9E</M_
strAboutMenu.LoadString(IDS_ABOUTBOX); SbS*z:
if (!strAboutMenu.IsEmpty()) C],"va
{ =Ji+GJ<,9
pSysMenu->AppendMenu(MF_SEPARATOR); ! f!/~M"!
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); L[;U
Z)V@
} WrJgU&H{
} =UY)U-
SetIcon(m_hIcon, TRUE); // Set big icon cCOw7<
SetIcon(m_hIcon, FALSE); // Set small icon mAO$gHQ
m_Key.SetCurSel(0); 5DB4 vh
RegisterHotkey(); &/)2P#u
CMenu* pMenu=GetSystemMenu(FALSE); 62BT 3/~
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &GMBvmP
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ;$=kfj9 :7
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); IkW8$>
return TRUE; // return TRUE unless you set the focus to a control I|&<!{Rq
} S~L;oX?(!
v__n>*x
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 3azyqpwU$
{ |qe[`x;
%
if ((nID & 0xFFF0) == IDM_ABOUTBOX) G':wJ7[]`
{ lRb|GS.h/
CAboutDlg dlgAbout; v0psth?qV
dlgAbout.DoModal(); $aIq>vJO9
} %a\!|/;6
else k2]fUP
{ va6e]p*Oy
CDialog::OnSysCommand(nID, lParam); r:rM~``
} ol^uM .k%_
} -;T!d
{yj8LxX^
void CCaptureDlg::OnPaint() (.r9bl
{ R-%v??
if (IsIconic()) &|6 A
8,
{ 'F-;uN
CPaintDC dc(this); // device context for painting v/ $~ifY"
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,_+Gb
// Center icon in client rectangle `4GEq2%
int cxIcon = GetSystemMetrics(SM_CXICON); ^LAP*R
int cyIcon = GetSystemMetrics(SM_CYICON); NJ%>|`FEi7
CRect rect; ]{sx#|_S
GetClientRect(&rect); 5t('H`,2
int x = (rect.Width() - cxIcon + 1) / 2; wAt|'wP
:
int y = (rect.Height() - cyIcon + 1) / 2; K;uO<{a)r
// Draw the icon ]Q8[,HTG
dc.DrawIcon(x, y, m_hIcon); 4\?z^^
} b({K6#?'[
else S1d^mu
{ 8/i];/,v*M
CDialog::OnPaint(); &oJ1v<`
} w?;j5[j
} ]{.iv_I
@la/sd4`
HCURSOR CCaptureDlg::OnQueryDragIcon() 8rV"? m`S
{ *P:!lO\|
return (HCURSOR) m_hIcon; /w|!SZB
} V=
wWY*C
HGiO}|q:
void CCaptureDlg::OnCancel()
,>C`|
{ ;*J_V/&?
if(bTray) VWLqJd>tr1
DeleteIcon(); .<fn+]
CDialog::OnCancel(); r]+/"~a
} ?:$aX@r
'}$]V>/
void CCaptureDlg::OnAbout() r(qwzUI
{ }F
B]LLi
CAboutDlg dlg; Z=KHsMnB
dlg.DoModal(); *#y9 Pve
} f*%Y]XL;%
TWU[/>K
void CCaptureDlg::OnBrowse() +hZ{/
{ ByU&fx2Z
CString str; Kb$6a'u7
BROWSEINFO bi; L>3- z>u,
char name[MAX_PATH]; #qnK nxD
ZeroMemory(&bi,sizeof(BROWSEINFO)); O-3R#sZ0
bi.hwndOwner=GetSafeHwnd(); )i^+=TZ q
bi.pszDisplayName=name; Jc=~BT_G
bi.lpszTitle="Select folder"; eV5
e:9
bi.ulFlags=BIF_RETURNONLYFSDIRS; S\poa:D`
LPITEMIDLIST idl=SHBrowseForFolder(&bi); [Dq@(Q s'
if(idl==NULL) hJc^NU5
return; 6Cpn::WW}
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =".sCV9"N
str.ReleaseBuffer(); 8
*Y(wqH
m_Path=str; _xz>O[unf
if(str.GetAt(str.GetLength()-1)!='\\') B]nu \!
m_Path+="\\"; 'Szk!,_
UpdateData(FALSE); BD_"w]bqD
} e~1$x`DH
o4qB0h
void CCaptureDlg::SaveBmp() 4#Rq}/h
{ cT.8&EEW
CDC dc; p!o+8Xz5
dc.CreateDC("DISPLAY",NULL,NULL,NULL); %;ZDw@_<
CBitmap bm; U|jip1\
int Width=GetSystemMetrics(SM_CXSCREEN); FdE9k\E#/)
int Height=GetSystemMetrics(SM_CYSCREEN); G0mvrc-(
bm.CreateCompatibleBitmap(&dc,Width,Height); ']^_W0?=
CDC tdc; krSOS WJ
tdc.CreateCompatibleDC(&dc); dXMO{*MF{H
CBitmap*pOld=tdc.SelectObject(&bm); "8R\!i.
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _08y; _S
tdc.SelectObject(pOld); ;kLp}CqV
BITMAP btm; 1
F+$\fLr
bm.GetBitmap(&btm); aUyJi
DWORD size=btm.bmWidthBytes*btm.bmHeight; #W2#'J:l
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); p9Y`_g`
BITMAPINFOHEADER bih; `]$H\gNI[8
bih.biBitCount=btm.bmBitsPixel; oFDJwOJ'Bj
bih.biClrImportant=0; !4"<:tSO
bih.biClrUsed=0; jlM%Y
ZC
bih.biCompression=0; [E:-$R
bih.biHeight=btm.bmHeight; rXF=/
bih.biPlanes=1; s g6e%
5
bih.biSize=sizeof(BITMAPINFOHEADER); o#frNT}
bih.biSizeImage=size; omZ
bn
bih.biWidth=btm.bmWidth; $1.l|
bih.biXPelsPerMeter=0; a-Ne!M[
bih.biYPelsPerMeter=0; 3IYbgUG
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); rrc>O*>{i
static int filecount=0; E[8i$
CString name; _>/OqYR_jQ
name.Format("pict%04d.bmp",filecount++); ?y4vHr"c
name=m_Path+name; |W;EPQ+<
BITMAPFILEHEADER bfh; 1vL$k[^&d
bfh.bfReserved1=bfh.bfReserved2=0; G1S:hw%rp
bfh.bfType=((WORD)('M'<< 8)|'B'); ;_D5]kl`
bfh.bfSize=54+size; pWN5 >HV
bfh.bfOffBits=54; L.$+W}
CFile bf; - *_"ZgE
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ nOdAp4{:q%
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); vy{YGT
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); x5YHmvy/l
bf.WriteHuge(lpData,size); kOLS<>.
bf.Close(); JNSH'9!n6
nCount++; ghVxcK
} ,}HnS)+
GlobalFreePtr(lpData); A]%hM_5 s
if(nCount==1) E?^A+)<"
m_Number.Format("%d picture captured.",nCount); nk+*M9r|I
else xyaU!E*
m_Number.Format("%d pictures captured.",nCount); pNzpT!}H>
UpdateData(FALSE); xx
EcmS#>
} 1`@rAA>h'
v}^
f8nVR
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !Z`xwk"!
{ ealh>Y
if(pMsg -> message == WM_KEYDOWN) c69M
{ VsR`y]"g
if(pMsg -> wParam == VK_ESCAPE) K$Yc!4M
return TRUE; *EzAo
if(pMsg -> wParam == VK_RETURN) liG3
return TRUE; '<KzWxuC
} ^bckl
tSo
return CDialog::PreTranslateMessage(pMsg); ]J6+nA6)
} bmu<V1[W
,';+A{aV
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) G)wIxm$?0
{ "K$
y(}C
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \`: LPe
SaveBmp(); ICI8xP}a?
return FALSE; *S>,5R0k
} fP
5!`8
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ?.&?4*u
CMenu pop; uH?lj&
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4,g3 c
CMenu*pMenu=pop.GetSubMenu(0); #$(wfb9
pMenu->SetDefaultItem(ID_EXITICON); z0m[25FQG
CPoint pt; !kg)8 4C[
GetCursorPos(&pt); vy+9Q5@W
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); L~~Dj:%uq
if(id==ID_EXITICON) gHzjI[WI
DeleteIcon(); L7qlvS Q
else if(id==ID_EXIT) >5!/&D.q
OnCancel(); J"dp?i
return FALSE; ALY%
h!L
} vXi}B
LRESULT res= CDialog::WindowProc(message, wParam, lParam); .1C|J
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) rO`nS<G
AddIcon(); |;B
'C#
return res; \ml6B6
} DLrG-C33
6lc/_&0
void CCaptureDlg::AddIcon() &Jw4^ob
{ lt&30nf=
NOTIFYICONDATA data; 4MOA}FZ~
data.cbSize=sizeof(NOTIFYICONDATA); ,.+"10=N.
CString tip; D3emO'`gQ
tip.LoadString(IDS_ICONTIP); vDAv/l9
data.hIcon=GetIcon(0); pY9>z;qD
data.hWnd=GetSafeHwnd(); 8E!I9z
strcpy(data.szTip,tip); TAt9+\'
data.uCallbackMessage=IDM_SHELL; ,`JXBI~
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; V6ioQx=K#
data.uID=98; e[@
^UY
Shell_NotifyIcon(NIM_ADD,&data); 2)^[SpZ
ShowWindow(SW_HIDE); 7" wn024
bTray=TRUE; WxS=Aip'
} 7#R&
OQ
UVD::
void CCaptureDlg::DeleteIcon() d4P0f'.z
{ ;,h*s,i
NOTIFYICONDATA data; _(\\>'1q!
data.cbSize=sizeof(NOTIFYICONDATA); ].2it{gF?b
data.hWnd=GetSafeHwnd(); = *A_{u;E
data.uID=98; rHtT>UE=
Shell_NotifyIcon(NIM_DELETE,&data); #dGg !D
ShowWindow(SW_SHOW); \[+\JWJj
SetForegroundWindow(); "Rp ]2'?
ShowWindow(SW_SHOWNORMAL); $u4esg
bTray=FALSE; /z4xq'<
} xIo7f
VrokEK*qbY
void CCaptureDlg::OnChange() */L;6_
{ NW9k.D%
RegisterHotkey(); e-os0F
} 1*x4T%RF$
+Hb6j02#
BOOL CCaptureDlg::RegisterHotkey() G\H@lFh
{ wz!]]EQ!o
UpdateData(); 4[!&L:tR
UCHAR mask=0; x./jTebeO
UCHAR key=0; ma
}Y\(38
if(m_bControl) 2/BFlb
mask|=4; #1zWzt|DW
if(m_bAlt) _+8$=k2nM
mask|=2; }#
-N7=h
if(m_bShift) uBks#Y*3$
mask|=1; ^tuJM:
key=Key_Table[m_Key.GetCurSel()]; ANCgch\
if(bRegistered){ {Pg7IYjH
DeleteHotkey(GetSafeHwnd(),cKey,cMask); V]PTAhc
bRegistered=FALSE; $XI5fa4Tt
} pKMf#)qm
cMask=mask; 7@vcQv
kC
cKey=key; o0wep&@
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); w'5~GhnP+
return bRegistered; xL>0&R
} =I/J !}.
ZF;S}1
四、小结 vfegIoZ
2+GF:[$
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。