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:
7 j=KiiI
&hL2xx= 一、实现方法
8>x'. 8 X2%(=B 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:
ao .vB']T \~Z%}$ = #pragma data_seg("shareddata")
:KXI@)M HHOOK hHook =NULL; //钩子句柄
;]>)6 UINT nHookCount =0; //挂接的程序数目
eu_ZsseZ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
VEIct{ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
f`/('}t static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
4~FRE)8 static int KeyCount =0;
f$-n%7 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
F|5Au>t #pragma data_seg()
MY
c& GU@#\3 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
]a~sJz! n@;B_Bt7 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
zG 9D
Ph =VZ_';b h BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
e?+-~]0 cKey,UCHAR cMask)
m$v >r\*X {
\>lA2^Ef BOOL bAdded=FALSE;
=l*xM/S for(int index=0;index<MAX_KEY;index++){
VzHrKI if(hCallWnd[index]==0){
H6jt[ hCallWnd[index]=hWnd;
x
lqP% HotKey[index]=cKey;
o'(BL:8s HotKeyMask[index]=cMask;
D g0rVV6c bAdded=TRUE;
['pO=ho KeyCount++;
0hGmOUO break;
UXpp1/d|e }
uSQ#Y^V_ }
' F9gp!s8~ return bAdded;
&<uLr
*+* }
+YW;63"o //删除热键
`#`jU"T | BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
X~"p]V_ {
c6c@XdV BOOL bRemoved=FALSE;
o}/|"(K for(int index=0;index<MAX_KEY;index++){
Ma$~B0!;s if(hCallWnd[index]==hWnd){
l*&N<Yu if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
"qR, V9\ hCallWnd[index]=NULL;
S!z3$@o HotKey[index]=0;
J+
S]Qoz HotKeyMask[index]=0;
rQ]JM bRemoved=TRUE;
F4z#u2~TC KeyCount--;
Vym0|cW break;
w"dKOdY }
~ *"iLf@, }
=QtFJ9\ }
:0 n+RL*5 return bRemoved;
0^uUt- }
~:f..|JM R"P-+T=7M R*lq7n9 DLL中的钩子函数如下:
9oO~UP!ag 1kL8EPT%o LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
\'Et)uD* {
wW)(mY? BOOL bProcessed=FALSE;
+M_ _\7 if(HC_ACTION==nCode)
4E=v)C' {
T9Juq6| if((lParam&0xc0000000)==0xc0000000){// 有键松开
$S?gQN.e switch(wParam)
L_vl%ii- {
m=^]93+ case VK_MENU:
$,, PF/N8c MaskBits&=~ALTBIT;
F5/,S break;
; xp-MK case VK_CONTROL:
>|kD(}Axf MaskBits&=~CTRLBIT;
`kQosQV break;
457{9k case VK_SHIFT:
81s
}4 MaskBits&=~SHIFTBIT;
YT(Eh3ID break;
C]5 kQ1Og default: //judge the key and send message
kV?fie<\) break;
Bz-jy. }
v=lW5%r,' for(int index=0;index<MAX_KEY;index++){
!1=OaOT if(hCallWnd[index]==NULL)
!f52JQyh continue;
2 Kjd!~Z$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7G-?^ {
`{Q'iydU SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
bK~Toz<k bProcessed=TRUE;
^&1O:G*" }
|H_WY# }
n^ fUKi*; }
N=2T~M 1 else if((lParam&0xc000ffff)==1){ //有键按下
C,l,fT switch(wParam)
=tt3nfZ9 {
q: FhuOP case VK_MENU:
FV
"pJ MaskBits|=ALTBIT;
4FRi=d;mP break;
~,1Sw7rE case VK_CONTROL:
={oNY.(Q MaskBits|=CTRLBIT;
J$1H3#VVG break;
\b(&-=( case VK_SHIFT:
~KMah MaskBits|=SHIFTBIT;
E;C{i break;
j`RG Moq default: //judge the key and send message
Z8xB
a0 break;
.06D_L"M }
mWaij]1> for(int index=0;index<MAX_KEY;index++){
)< G(C,!,. if(hCallWnd[index]==NULL)
?=&S?p)-< continue;
vFR*3$R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
9N9&y^SmD {
0@cIj
] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
pIcg+~ bProcessed=TRUE;
qNj?Rwc }
HBE[q# }
bT2G
G }
\N0vA~N. if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
t
sUu for(int index=0;index<MAX_KEY;index++){
<nbklo if(hCallWnd[index]==NULL)
EyPJ Jc8 continue;
V2T%tn;rp if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
JXU?'@QY SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
,k4pW&A //lParam的意义可看MSDN中WM_KEYDOWN部分
oxc;DfJ_ }
[C6ba{9B }
B1nm?E 0i }
C&w0HoF return CallNextHookEx( hHook, nCode, wParam, lParam );
&F~d~;G"q }
o(jLirnk ZJBb%d1; 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:
fS4W*P[B3 sS}:O d BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Io3-\Ff BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
$Xlr@)% (Fzy8
s 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
QNMZR <>\|hno} LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
`Fr ,,Q81\ {
-GPBX? if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
iG6]Pr|;e {
{HEWU<5 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
R~oJ-}iYX SaveBmp();
IXa~,a H71 return FALSE;
*2a" 2o }
l6HtZ( …… //其它处理及默认处理
ekyCZ8iai }
nA,=g'7S SQcic]Ep xc}[q`vK 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
6Oy:5Ps8a 6;'[v}O^^ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
IVSC7SBiT (?1$ 二、编程步骤
KZ7B2 ?tjEXg>ny 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";
z U[pn)pe -@w,tbc$ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
:V+rC]0 }/1^Lqfnz 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;
GE!nf6>Km *%;A85V/ 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;
"t4z)j; La1:WYt 5、 添加代码,编译运行程序。
|cY HH$ '69)m~B0a 三、程序代码
.2JZ7 }NC$Ce ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
ESV./~K #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Pt5 wm\ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
x/<]/D #if _MSC_VER > 1000
/r~2KZE #pragma once
<p b #endif // _MSC_VER > 1000
5 [~HL_u;, #ifndef __AFXWIN_H__
hTLf$_|P #error include 'stdafx.h' before including this file for PCH
yg}O9!M J #endif
ct-Bq #include "resource.h" // main symbols
YM_ [ class CHookApp : public CWinApp
^aAs=KditO {
^\gb|LEnK public:
\UK}B CHookApp();
?{TWsuP7 // Overrides
\ 2y/: // ClassWizard generated virtual function overrides
,V9qiu=m
//{{AFX_VIRTUAL(CHookApp)
uZn_*_J! public:
j_90iP^5: virtual BOOL InitInstance();
Fw&ImRMk virtual int ExitInstance();
PdO"e //}}AFX_VIRTUAL
qA7,txQ: //{{AFX_MSG(CHookApp)
L%v@|COQ3 // NOTE - the ClassWizard will add and remove member functions here.
]j7`3%4uK // DO NOT EDIT what you see in these blocks of generated code !
y+iRZ%V^ //}}AFX_MSG
75Z|meG~ DECLARE_MESSAGE_MAP()
AJi+JO- };
np^&cY] LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
<T[LugI BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
3'.3RKV BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
rogy`mh\r2 BOOL InitHotkey();
vOlfyH> BOOL UnInit();
2K>1,[ C'Z #endif
n`Pl:L*kG Q.B)?w m //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
1r>]XhRFZ #include "stdafx.h"
~fkcal1@ #include "hook.h"
q#AEu
xI1 #include <windowsx.h>
M(+Pd_c6 #ifdef _DEBUG
QoxYzln #define new DEBUG_NEW
Wd;t(5Xl #undef THIS_FILE
h623)C; static char THIS_FILE[] = __FILE__;
MS""-zn< #endif
%^lD #define MAX_KEY 100
Gf.ywqE$Y$ #define CTRLBIT 0x04
72~L ? #define ALTBIT 0x02
ZskX!{ #define SHIFTBIT 0x01
Ne<S_u2nT #pragma data_seg("shareddata")
~2rQ80_ HHOOK hHook =NULL;
K9xvog UINT nHookCount =0;
#>aq'47j static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
+g?uvXC& static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
'M6+(`x static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
M4)U
[v static int KeyCount =0;
?=Ceo#Er static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
_$$.5?4 #pragma data_seg()
}w4OCN\1
HINSTANCE hins;
)=GPhC/sw void VerifyWindow();
u=nd7:bv BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
K.QSt //{{AFX_MSG_MAP(CHookApp)
zl8M<z1`1 // NOTE - the ClassWizard will add and remove mapping macros here.
i=<;$+tW // DO NOT EDIT what you see in these blocks of generated code!
5?H8?~&dz //}}AFX_MSG_MAP
z#&1> END_MESSAGE_MAP()
9cB+x`+Lu P.Bwfa CHookApp::CHookApp()
Ld.9.d] {
B\R X // TODO: add construction code here,
ShC$ue?Q // Place all significant initialization in InitInstance
':_9o5I }
ktfm .:&`PaMt CHookApp theApp;
ep"{{S5g LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
tcoG;ir {
A^).i_ BOOL bProcessed=FALSE;
fmK~? if(HC_ACTION==nCode)
^dLu#,; {
MkMDI)Y| if((lParam&0xc0000000)==0xc0000000){// Key up
$Z)u04;&@ switch(wParam)
+r"}@8/\1 {
b|.Cqsb case VK_MENU:
2R,}
j@ MaskBits&=~ALTBIT;
u_NLgM7* break;
&=)O:Jfa case VK_CONTROL:
q
n-f&R MaskBits&=~CTRLBIT;
e
bpt/q[ break;
oQ-m case VK_SHIFT:
"[7-1} l MaskBits&=~SHIFTBIT;
mmJnE break;
%2dzx[s default: //judge the key and send message
u3qxG3 break;
;8PO}{rD }
giu{,gS0?M for(int index=0;index<MAX_KEY;index++){
E`_T_O=P if(hCallWnd[index]==NULL)
B /uaRi% continue;
%C`P7&8m=O if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
N,lr~6) {
C[%Qg=< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
55s5(]`d bProcessed=TRUE;
P]n0L4c }
0fX` >-X }
8GW+: }
ORrZu$n`p else if((lParam&0xc000ffff)==1){ //Key down
yq|yGf(4& switch(wParam)
|*JMPg?zI {
=5*Wu+S4r case VK_MENU:
plPPf+\ MaskBits|=ALTBIT;
J|{50?S{^ break;
t* Ct* case VK_CONTROL:
)rP,+ B?W MaskBits|=CTRLBIT;
\azMF} mb break;
D)x^?! case VK_SHIFT:
^k7I+A MaskBits|=SHIFTBIT;
@4UX~=:686 break;
A^FkU default: //judge the key and send message
hNh!H<}|m8 break;
D+:s{IcL< }
nuWQ3w
p[e for(int index=0;index<MAX_KEY;index++)
VK*_pEV,} {
RK-bsf if(hCallWnd[index]==NULL)
dQSO8Jf continue;
Pa0W|q#?X if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>ye.rRZd` {
M`K]g&57hL SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
mW!n%f bProcessed=TRUE;
<eMqg u }
&,<,!j)Jr }
RiAg: }
rfVQX<95=/ if(!bProcessed){
|dEPy-Xe for(int index=0;index<MAX_KEY;index++){
wipl5O@L if(hCallWnd[index]==NULL)
x&DqTX?b, continue;
6bUP]^d if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
0,~s0]h0V SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
sAU%:W{ }
&'i_A%V }
[- 92] }
3.#L return CallNextHookEx( hHook, nCode, wParam, lParam );
w;}5B~). }
Nb:j]U AJ>E\DK0] BOOL InitHotkey()
c-JXWNz {
mZB:j]T if(hHook!=NULL){
7"2BZ nHookCount++;
)/DN>rU return TRUE;
k0=!%f_G! }
0qNmao4E_ else
wxcJ2T d H hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
J'|[-D-a if(hHook!=NULL)
4|&/#Cz^Y nHookCount++;
Czw]5 return (hHook!=NULL);
:'%|LBc0 }
|MKR&%Na BOOL UnInit()
_Jg#T~ {
{sB-"NR`K if(nHookCount>1){
FJH>P\+ nHookCount--;
$!. [R} return TRUE;
r4[=pfe25 }
1lIs
jBo g BOOL unhooked = UnhookWindowsHookEx(hHook);
IY6Ll6OK if(unhooked==TRUE){
wN'S+4 nHookCount=0;
n:40T1:q hHook=NULL;
Z?xaXFm_ }
_+P*XY5 return unhooked;
0
N7I:vJ }
~SBW`=aP} 9;XbyA] BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
MVzj7~+ {
p_BG#dRM BOOL bAdded=FALSE;
XGR63hXND for(int index=0;index<MAX_KEY;index++){
V C VqUCc if(hCallWnd[index]==0){
,d/$!Yf hCallWnd[index]=hWnd;
{@L{l1|0 HotKey[index]=cKey;
gQik>gFr HotKeyMask[index]=cMask;
!bLCha\ bAdded=TRUE;
mY"Dw^) KeyCount++;
6{i0i9Tb break;
`f}ZAX }
!-T#dU }
037\LPO return bAdded;
s1]Pv/a=y }
z)KoK`\mE" W (TTsnnx BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
.(Ux1.0C {
>.P*lT BOOL bRemoved=FALSE;
qU6!vgM& for(int index=0;index<MAX_KEY;index++){
gmu.8 if(hCallWnd[index]==hWnd){
b/*QV0( if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
q*R~gEi#yk hCallWnd[index]=NULL;
i / o HotKey[index]=0;
`2U,#nZ 4 HotKeyMask[index]=0;
V9<E`C bRemoved=TRUE;
chD7^&5] KeyCount--;
fXnTqKAfu6 break;
_Q^jk0K8ga }
=aj|auu }
0e"KdsA:<U }
"Vc|D (g return bRemoved;
bZWR.</ }
YdvXp/P:|
PC@HNto{ void VerifyWindow()
EhO\N\p(Q= {
pHVDug3 for(int i=0;i<MAX_KEY;i++){
/oe0 if(hCallWnd
!=NULL){ @.cord`
if(!IsWindow(hCallWnd)){ 6C.!+km
hCallWnd=NULL; P[H`]q|
HotKey=0; n}Thc6f3D
HotKeyMask=0; Rq(+zL(f
KeyCount--; #|769=1
} N0lFx?4
} vr47PM2al
} >/.jB/q
} "e\73?P
^+~$eg&js
BOOL CHookApp::InitInstance() n$j B"1
{ PTpCiiA@
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Gg6cjc =dC
hins=AfxGetInstanceHandle(); $+e(k~
InitHotkey(); tMf5TiWu@
return CWinApp::InitInstance(); K'e!BZm6Q
} "[A&S!
[uie]*^
int CHookApp::ExitInstance() j }^?Snq
{ rf$[8d
VerifyWindow(); \2@9k`
UnInit(); J=^5GfM)J
return CWinApp::ExitInstance(); ND9;%<80
} *sfz+8Y
_jkJw2+s\
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file
v/KTEM
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) B7{j$0fm*
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ]6=opvm
#if _MSC_VER > 1000 <9=RLENmY"
#pragma once QQHC
1
#endif // _MSC_VER > 1000 Jl"DMUy[kW
t@cBuV`9c
class CCaptureDlg : public CDialog 3joMtRB>;
{ T^xp2cZ
// Construction
&@7|_60
public: 5hCfi
BOOL bTray; mn<ea&
BOOL bRegistered; 2(D&jL
BOOL RegisterHotkey(); |@-y+vbA*
UCHAR cKey; Dhg/>@tw
UCHAR cMask; Eh_[8:dK
void DeleteIcon(); nzYFa J +
void AddIcon(); jaux:fU
UINT nCount; dnPr2oI?I
void SaveBmp(); ~}~ yR*K%
CCaptureDlg(CWnd* pParent = NULL); // standard constructor \BsvUGd
// Dialog Data WWTJ%Rd|
//{{AFX_DATA(CCaptureDlg) yNx"Ey dk`
enum { IDD = IDD_CAPTURE_DIALOG }; 1^;&?E
CComboBox m_Key; tK <)A)
BOOL m_bControl; ER$~kFE2yP
BOOL m_bAlt; !q PUQ+
BOOL m_bShift; ?~Vev D
CString m_Path; YX2j;Y?
CString m_Number; pk=z<OTb
//}}AFX_DATA M[T!AO-S$
// ClassWizard generated virtual function overrides p:U{3uN 62
//{{AFX_VIRTUAL(CCaptureDlg) 3^&pb
public: t;ga>^NA"
virtual BOOL PreTranslateMessage(MSG* pMsg); RzSN,bLR
protected: p7O4CP>9[
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support p/s5[>N
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); CV7.hF<
//}}AFX_VIRTUAL X_|} b[b
// Implementation }fxH>79g
protected: -3b0;L&4>x
HICON m_hIcon; lu.2ZQE
// Generated message map functions Ki@8
//{{AFX_MSG(CCaptureDlg) Ix5yQgnB}j
virtual BOOL OnInitDialog(); 0MzHr2?'P
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 3?/}
afx_msg void OnPaint(); 55|$Imnf
afx_msg HCURSOR OnQueryDragIcon(); cKy%0oTla
virtual void OnCancel(); |b7>kM}"
afx_msg void OnAbout(); EA>$t\z
afx_msg void OnBrowse(); AB#hhi#
afx_msg void OnChange(); ~JT{!wcE}o
//}}AFX_MSG ~GY;{
DECLARE_MESSAGE_MAP()
IWpUbD|kC
}; -XY]WWlq
#endif (/Y
gcT
&q` =xF
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file QnOa?0HL/
#include "stdafx.h" A><%"9pZ
#include "Capture.h" +Q_Gm3^
#include "CaptureDlg.h" pV-.r-P
#include <windowsx.h> qC|re!K
#pragma comment(lib,"hook.lib") aA
yFu_
#ifdef _DEBUG ->#7_W
#define new DEBUG_NEW s^v,i
CH{
#undef THIS_FILE "|&*MjwN6
static char THIS_FILE[] = __FILE__; p0YTZS ]h
#endif I~T?tm
#define IDM_SHELL WM_USER+1 bFx?HM.AGW
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wLUmRo56aR
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >zhbipA
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3i$AR
class CAboutDlg : public CDialog P?uKDON
{ V+K.'
J
^@
public: ,[hJi3xM
CAboutDlg(); {DO9{96w4
// Dialog Data 0UB'6wRVo
//{{AFX_DATA(CAboutDlg) ?%0i,p@<
enum { IDD = IDD_ABOUTBOX }; QY fS-
//}}AFX_DATA T<=\5mn
// ClassWizard generated virtual function overrides 6$5M^3$-
//{{AFX_VIRTUAL(CAboutDlg) G0&w#j
protected: mLYB6
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Wl2>U(lj
//}}AFX_VIRTUAL [E /3&3
// Implementation Mo<p+*8u:
protected: %`\{Nxk
//{{AFX_MSG(CAboutDlg) gR>#LM&dG
//}}AFX_MSG 6%xl}z]o
DECLARE_MESSAGE_MAP() Fu><lN7
}; 6u7HO-aa
y@z#Jw<
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Yb\36|
{ :R&tO3_F
//{{AFX_DATA_INIT(CAboutDlg) d16PY_
//}}AFX_DATA_INIT eK@Y] !lz
} p 5'\< gQ
u60l -
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %~[F^
{ U\z+{]<<
CDialog::DoDataExchange(pDX); n(+:l'#HJ
//{{AFX_DATA_MAP(CAboutDlg) pVY.&XBZ$
//}}AFX_DATA_MAP P$QfcJq&c*
} 3WVHI$A9
$_UF9l0
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Q&LkST-i
//{{AFX_MSG_MAP(CAboutDlg) EkBM>*W
// No message handlers }bTMeCgI
//}}AFX_MSG_MAP ,5*4%*n\
END_MESSAGE_MAP() j?(QieBH
fe$WR~
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (TQXG^n$gY
: CDialog(CCaptureDlg::IDD, pParent) 'mM5l*{
{ !1_:n D
//{{AFX_DATA_INIT(CCaptureDlg) btE+.V
m_bControl = FALSE; / u{r5`4
m_bAlt = FALSE; M>#{~zr
m_bShift = FALSE; >j?uI6Uw
m_Path = _T("c:\\"); G#C)]4[n
m_Number = _T("0 picture captured."); hU{%x#8}lK
nCount=0; EKf4f^<
bRegistered=FALSE; k4P.}SJ?
bTray=FALSE; m}E$6E^~O
//}}AFX_DATA_INIT koU.`l.
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 td~3N,S
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); #]'xUgcE9
} ^pP
14y*go
gs3}rW
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) A.FI] K@
{ o5R\7}]GE
CDialog::DoDataExchange(pDX); 6M9rC[h\
//{{AFX_DATA_MAP(CCaptureDlg) H6eGLg={
DDX_Control(pDX, IDC_KEY, m_Key); #Grm-W9E
DDX_Check(pDX, IDC_CONTROL, m_bControl); ]gW J,
DDX_Check(pDX, IDC_ALT, m_bAlt); S7vE[VF5
DDX_Check(pDX, IDC_SHIFT, m_bShift); one>vi`=
DDX_Text(pDX, IDC_PATH, m_Path); Z0=OR^HjA
DDX_Text(pDX, IDC_NUMBER, m_Number); uwka 2aSS
//}}AFX_DATA_MAP |<0@RCgM
} #rwR)9iC0
SJ-Sac58r
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]lY9[~
v
//{{AFX_MSG_MAP(CCaptureDlg) 2 *$n?
ON_WM_SYSCOMMAND() K&h6#[^\d
ON_WM_PAINT() ihVQ,Cth
ON_WM_QUERYDRAGICON() =!X4j3Cv
ON_BN_CLICKED(ID_ABOUT, OnAbout) ZIp=JR8o$
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) u/f&Wq/
ON_BN_CLICKED(ID_CHANGE, OnChange) p3o?_ !Z
//}}AFX_MSG_MAP ._Xtb,p{
END_MESSAGE_MAP() :Eyv= =
5,Y2Lzr
BOOL CCaptureDlg::OnInitDialog() "q.uiz+1:
{ di5_5_$`o
CDialog::OnInitDialog(); A@OV!DJe]
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 'Ot[q^,KRG
ASSERT(IDM_ABOUTBOX < 0xF000); l?o-
p
CMenu* pSysMenu = GetSystemMenu(FALSE); 4o3GS8
if (pSysMenu != NULL) P$Q&xN<#)
{ ~aG-^BAS
CString strAboutMenu; (Nahtx!/9
strAboutMenu.LoadString(IDS_ABOUTBOX); jHCKV
if (!strAboutMenu.IsEmpty()) |_*$+
{ Kc0OLcu^d
pSysMenu->AppendMenu(MF_SEPARATOR); vp@+wh]#
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); =*Xf(mh c
} MjTKM;
} Hi9z<l=$
SetIcon(m_hIcon, TRUE); // Set big icon 9_3M}|V$^e
SetIcon(m_hIcon, FALSE); // Set small icon &?6w2[}
m_Key.SetCurSel(0); )|x5#b-lz
RegisterHotkey();
lijy?:__
CMenu* pMenu=GetSystemMenu(FALSE); cG:`Zj~4
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); d
]
;pG(
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )[*O^bPowI
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \irjIXtV
return TRUE; // return TRUE unless you set the focus to a control Tt|6N*b'
} *
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sBnPS[Oo
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Pa +BE[z
{ m5N&7qgp
if ((nID & 0xFFF0) == IDM_ABOUTBOX) rR~X>+K
{ `WS_*fJ5
CAboutDlg dlgAbout; 8)8oR&(f
dlgAbout.DoModal(); sIsu >eL
} 5nAF =Bj
else [)~@NN
{ )g_zPt
CDialog::OnSysCommand(nID, lParam); ^E17_9?
} hJsC
\ C,^
} 4
G[hU4L
Yur)_m
void CCaptureDlg::OnPaint() @/L. BfTz
{ |$2N$6\SP
if (IsIconic()) 1 ,'^BgI,
{ c&-$?f
r
CPaintDC dc(this); // device context for painting {2r7:nvR
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); P*Sip?tdE
// Center icon in client rectangle nn4Sy,cz
int cxIcon = GetSystemMetrics(SM_CXICON); I;H9<o5
int cyIcon = GetSystemMetrics(SM_CYICON); GTl (i*
CRect rect; Els= :4
GetClientRect(&rect); [uQZD1<q
int x = (rect.Width() - cxIcon + 1) / 2; 5Suc#0y
int y = (rect.Height() - cyIcon + 1) / 2; ot#kU 8f
// Draw the icon 79g>7<vp
dc.DrawIcon(x, y, m_hIcon); 0f/!|c
} /ASI0h
else P'9io!Z-s
{ WI_mJ/2
CDialog::OnPaint(); ]_8I_VcQ
}
}92lr87
} !p2,|6Y`y
D(U3zXdO
HCURSOR CCaptureDlg::OnQueryDragIcon() @(fY4]K
{ 5O
;^Mk|
return (HCURSOR) m_hIcon; z %E!tB2o
} C&N4<2b
g8A{aHb1}
void CCaptureDlg::OnCancel() !13
/+ u
{ u#k,G`
if(bTray) AiK4t-
DeleteIcon(); BrMp_M
CDialog::OnCancel(); eh4"_t
} S@NhEc
3MJWC o-[
void CCaptureDlg::OnAbout() 9= $,] M
{ =3dbw8I
CAboutDlg dlg; 9XvM%aHs:
dlg.DoModal(); ULmdt
} p+UHJ&
<JM%Kn )
void CCaptureDlg::OnBrowse() ^Jl!WH=20}
{ T)f_W
CString str; t0d '>
BROWSEINFO bi; @aN=U=
char name[MAX_PATH]; y"p-8RVk{
ZeroMemory(&bi,sizeof(BROWSEINFO)); (A fbS=[
bi.hwndOwner=GetSafeHwnd(); '4lT*KN7\
bi.pszDisplayName=name; wf<`J/7u
bi.lpszTitle="Select folder"; Tc5OI' -V
bi.ulFlags=BIF_RETURNONLYFSDIRS; 3l(;Pt-yI
LPITEMIDLIST idl=SHBrowseForFolder(&bi); | O+>#
if(idl==NULL) qS}RFM5|
return; ,xe@G)a
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); %aE7id>v6
str.ReleaseBuffer(); (`.qG
&6p
m_Path=str; G:C6`uiy`
if(str.GetAt(str.GetLength()-1)!='\\') 8kM0
m_Path+="\\"; <ZC^H
UpdateData(FALSE); &t|V:_?/x
} JX$NEq(
(g2r\hI
void CCaptureDlg::SaveBmp() NF(IF.8G
{ B "F`OS[
CDC dc; ^O Xr: P
dc.CreateDC("DISPLAY",NULL,NULL,NULL); JKi@Kw
CBitmap bm; ;4v}0N~.
int Width=GetSystemMetrics(SM_CXSCREEN); P9mxY*K)%5
int Height=GetSystemMetrics(SM_CYSCREEN); vp75u93
bm.CreateCompatibleBitmap(&dc,Width,Height); 2n;;Tso"
CDC tdc; !^bB/e
tdc.CreateCompatibleDC(&dc); r2F
CBitmap*pOld=tdc.SelectObject(&bm); Fif^V
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); wt=>{JM
tdc.SelectObject(pOld); m-S33PG{
BITMAP btm; ;E? hz
bm.GetBitmap(&btm); Vt)\[Tl~
DWORD size=btm.bmWidthBytes*btm.bmHeight; lJ] \
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); .Jat^iFj0
BITMAPINFOHEADER bih; Q()RO*9
bih.biBitCount=btm.bmBitsPixel; 0H&U=9'YT
bih.biClrImportant=0; XvkI+c
bih.biClrUsed=0; d7tD|[(J
bih.biCompression=0; SAE'?_
bih.biHeight=btm.bmHeight; cvXI]+`<3\
bih.biPlanes=1; .6 ?>t!&W
bih.biSize=sizeof(BITMAPINFOHEADER); } .H Fm'p
bih.biSizeImage=size; &J/4J
bih.biWidth=btm.bmWidth; 3auJ^B}
bih.biXPelsPerMeter=0; NuS|X
bih.biYPelsPerMeter=0; {}J@+Zsi
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); (06Vcqg
static int filecount=0; eo*u(@
CString name; CVSsB:H6e
name.Format("pict%04d.bmp",filecount++); s@)"IdSA(
name=m_Path+name; w]Ko/;;^2
BITMAPFILEHEADER bfh; 90h1e7ZcC
bfh.bfReserved1=bfh.bfReserved2=0; :_QAjU
bfh.bfType=((WORD)('M'<< 8)|'B'); ['Y+z2k
bfh.bfSize=54+size; |RAQ% VXm
bfh.bfOffBits=54; Fx[A8G
CFile bf; rq(~/Yc
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ,[}yf#8@J
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); c<h!QnJ
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Gz[ymj)5
bf.WriteHuge(lpData,size); t3#H@0<
bf.Close(); F2PLy
q
nCount++; tC@zM.v%
} mQ^@ \s
GlobalFreePtr(lpData); o&XMgY~
if(nCount==1) B`?N0t%X
m_Number.Format("%d picture captured.",nCount); rv%ye
H
else x#j\"$dla
m_Number.Format("%d pictures captured.",nCount); Msa6yD#
UpdateData(FALSE); 4j/ iG\
} !G"9xrr1
s{z~Axup-
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) oLqbR?
{ 2htA7V*dD
if(pMsg -> message == WM_KEYDOWN) !,6v=n[Nz
{ 4/`h@]8P
if(pMsg -> wParam == VK_ESCAPE) A M1C
$
return TRUE; 4I#eC#"
if(pMsg -> wParam == VK_RETURN) mj(&`HRs4
return TRUE; Mi/ &$"=
} ]Ic?:lKN
return CDialog::PreTranslateMessage(pMsg); V^`?8P8d
} (+gL#/u
|:(23O
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `Ge +(1x
{ jqX@&}3@
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >Z2,^5P{
SaveBmp(); Rgfc29(8
return FALSE; pe!dm}!h[
} e\A(#l@g
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2%{YYT
CMenu pop; GIRSoRVsh
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); /J[H5uA
CMenu*pMenu=pop.GetSubMenu(0); uFm+Y]h
pMenu->SetDefaultItem(ID_EXITICON); F[7Kw"~J
CPoint pt; d@D;'2}Yc
GetCursorPos(&pt); ,\S pjE
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 0 .FHdJ<
if(id==ID_EXITICON) S[L#M;n
DeleteIcon(); %CxEZPe$
else if(id==ID_EXIT) ie$`pyj!x
OnCancel(); (!0j4'
return FALSE; kh<pLI >$h
} yWv<A^C&
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `s>UU- 9
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4{*tn"y
AddIcon(); |ilv|U V
return res; XJ:>UNf5;
} mZbWRqP[|_
cZDxsd]
void CCaptureDlg::AddIcon() 9RCO|J
{ %R.xS}
Q
NOTIFYICONDATA data; zmB31' _
data.cbSize=sizeof(NOTIFYICONDATA); FI1THzW4J
CString tip; GJIWG&C03
tip.LoadString(IDS_ICONTIP); %_b^!FR
data.hIcon=GetIcon(0); y^mWG1"O
data.hWnd=GetSafeHwnd(); <DeKs?v
strcpy(data.szTip,tip); *?^Z)C>
data.uCallbackMessage=IDM_SHELL; Sg. +`xww3
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; }xkLD!
data.uID=98; ?~aZ#%*i8
Shell_NotifyIcon(NIM_ADD,&data); $Wr\[P:
ShowWindow(SW_HIDE); tLD~
bTray=TRUE; *t#s$Ga
} poXLy/K
>Lw}KO`
void CCaptureDlg::DeleteIcon() UTDcX
{ 5!'R'x5e
NOTIFYICONDATA data; HDF!`
data.cbSize=sizeof(NOTIFYICONDATA); o%Be0~n'
data.hWnd=GetSafeHwnd(); AezvBY0'`z
data.uID=98; ~|CJsD/
Shell_NotifyIcon(NIM_DELETE,&data); F-BJe]
ShowWindow(SW_SHOW); N+CXOI=6x
SetForegroundWindow(); NI5]Nz<?
ShowWindow(SW_SHOWNORMAL); >H0) ph
bTray=FALSE; }O,U2=Hw`]
} xl+DRPzl
zH)cU%I@.
void CCaptureDlg::OnChange() JcTp(fnW.~
{ vix&E`0yD
RegisterHotkey(); 0PnD|]9:
} 2qZa9^}
3[0w+{(Q
BOOL CCaptureDlg::RegisterHotkey() 4GG1E. z}
{ SXRdNPXFO
UpdateData(); <91t`&aWW
UCHAR mask=0; `y\*m]:
UCHAR key=0; ds*m6#1b
if(m_bControl) O^.%C`*
mask|=4; Xh.+pJl,*
if(m_bAlt) $uEJn&n7}
mask|=2; Xw7{R
if(m_bShift) PUbaS{J7
mask|=1; ''#p47$8<d
key=Key_Table[m_Key.GetCurSel()]; ?mH@`c,fM
if(bRegistered){ ],;D2]<s
DeleteHotkey(GetSafeHwnd(),cKey,cMask); p+, 1Fi
bRegistered=FALSE; cQ8dc+ {
} UI!6aVL.
cMask=mask; g3|BE2?
cKey=key; v~^ks{
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 6m4Te|
return bRegistered; rr |"r
} j~M#Ss-H8
cCM
j\H@
四、小结 `1nRcY
9<xTu>7J
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。