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:
HWD
3 uhwoE 一、实现方法
> : \lDz D|6prC%/ 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:
+'Tr>2V #ZF|5r + #pragma data_seg("shareddata")
lhJT& HHOOK hHook =NULL; //钩子句柄
9cX
~ UINT nHookCount =0; //挂接的程序数目
VO[s:e9L static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
4k<4=E static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
'Pr(7^ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
{i`BDOaL static int KeyCount =0;
'mG[#M/Y static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
[ gx<7}[ #pragma data_seg()
*W%HTt"N D_(xhM 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。
S1*n4w.H 3($%A GKJ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
m3\lm@`)O 0KU,M+_ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
)z$VQ=]" cKey,UCHAR cMask)
uFL~^vz {
7*~
rhQ BOOL bAdded=FALSE;
|j<b? for(int index=0;index<MAX_KEY;index++){
wp$CJ09f* if(hCallWnd[index]==0){
Bp>%'L hCallWnd[index]=hWnd;
"JKrbgN@;L HotKey[index]=cKey;
T&X*[kP HotKeyMask[index]=cMask;
?L+@?fVN bAdded=TRUE;
?4(uwXp KeyCount++;
N1zB;-0t break;
srO{Ci0 }
HG5|h[4Gt }
0:Yz'k5 return bAdded;
c7L#f=Ot? }
>}43MxU? //删除热键
V[uB0#Lp BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\y"!`.E7\d {
TOeJnk BOOL bRemoved=FALSE;
c+Ejah+ for(int index=0;index<MAX_KEY;index++){
-Q<3Q_ if(hCallWnd[index]==hWnd){
]?/[& PP, if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
G!L=W#{ hCallWnd[index]=NULL;
#/MUiV HotKey[index]=0;
8s6[?=nM HotKeyMask[index]=0;
o_vK4%y( bRemoved=TRUE;
wVP{R3 KeyCount--;
<dLdSEw break;
+\?#8U/k }
z2A7:[ }
n!~{4
uUW }
9 k)?- return bRemoved;
oslV@v
F }
IM7k\ 0bzD-K4WVd -r_z,h| DLL中的钩子函数如下:
$._p !, < ;.'2ZNt2 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
v%VCFJ {
VSc;}LH BOOL bProcessed=FALSE;
/E@LnKe if(HC_ACTION==nCode)
%o.{h {
c{ +Y$ if((lParam&0xc0000000)==0xc0000000){// 有键松开
*ukE"Aj switch(wParam)
oIAP dn {
QA+qFP case VK_MENU:
gmJiKuAL5 MaskBits&=~ALTBIT;
Xv|~1v%s7 break;
k?o(j/ case VK_CONTROL:
I)U|~N MaskBits&=~CTRLBIT;
.ss/E break;
j$4Tot case VK_SHIFT:
@=E@
*@g MaskBits&=~SHIFTBIT;
/NNe/7'l break;
D"El6<3)h default: //judge the key and send message
5YQ4]/h break;
<2HI. @^ }
q UY;CEf for(int index=0;index<MAX_KEY;index++){
4xjk^N9 if(hCallWnd[index]==NULL)
vHCz_ FV continue;
Ps4spy0Fp if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
J'sVT{@GS {
^!3Sz1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
k$9oUE, bProcessed=TRUE;
N0,.cd]y` }
d/k&f5 }
7N+No.vR. }
uZ&,tH/ else if((lParam&0xc000ffff)==1){ //有键按下
Ia*eb%HG switch(wParam)
8B"jvrs {
g|a2z_R case VK_MENU:
<*<7p{x MaskBits|=ALTBIT;
t
\kI( G break;
w4<RV:Vmt case VK_CONTROL:
XsQ?&xK=u MaskBits|=CTRLBIT;
\h~;n)FI break;
Ratg!l|'- case VK_SHIFT:
8j. 9Sk/ MaskBits|=SHIFTBIT;
hub1rY|No break;
Mf^ ;('~ default: //judge the key and send message
wLAGe'GX break;
Nc()$Nl8 }
MoIVval/ for(int index=0;index<MAX_KEY;index++){
RAxAy{ if(hCallWnd[index]==NULL)
{e/Qs|a
R continue;
o}mD1q0yE if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
"<SK=W {
H1N_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Edj}\e*-J bProcessed=TRUE;
\::<] }
S\JV96 }
Af pB=3 }
E)|fKds
if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
2~AGOx for(int index=0;index<MAX_KEY;index++){
6Daz1Pxd+ if(hCallWnd[index]==NULL)
-z)I;R continue;
!n~p?joJ* if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
'KMyaEh.u SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-)(HG)3 //lParam的意义可看MSDN中WM_KEYDOWN部分
uli,@5%\ }
|XzqP +t }
n qg=I }
5 5>^H1M return CallNextHookEx( hHook, nCode, wParam, lParam );
ZMQSy7 }
m;)[gF $/ew'h9q 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
qP-* ;?"2sS!AHQ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
js/N qf2> BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
T.HS. x>m_ v 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
#8z2>&:| r5tC LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
W6_/FkO {
b/5 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
QXqBb$AXi, {
Fr?o
4E6h //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
N>giFj[dD SaveBmp();
y)X1!3~( return FALSE;
lPFT)>(+@ }
,.6Hh'^65^ …… //其它处理及默认处理
S-Mn }
m!L&_Z|j ^$c+r%9k 02q]^3 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。
eL[BH8l ,d'x]&a 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。
7Rqjf6kX`O s|.V:%9e 二、编程步骤
$q.%4 H]K(`)y}4 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
Q"n|<!DN (E )@@p7,: 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
`j{5$X 9IZ}}x 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;
UmZ#Cm ig3HPlC 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;
Vi[* a :
&>PN,q> 5、 添加代码,编译运行程序。
zBV7b| j A
q;]al 三、程序代码
3QM6M9M yPL1(i; ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
DS0c0lsx #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
JJ[.K*dO #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Hz&a~ #if _MSC_VER > 1000
eD5.*O #pragma once
{0
d/; #endif // _MSC_VER > 1000
cl:h'aG #ifndef __AFXWIN_H__
.I_Mmaq;i #error include 'stdafx.h' before including this file for PCH
*P]FX-D3 #endif
|{]W (/ #include "resource.h" // main symbols
`2Rd=M]? class CHookApp : public CWinApp
U<QO@5 {
U0G( public:
(+lwt CHookApp();
qKag'0e // Overrides
>J,Rx!fq3 // ClassWizard generated virtual function overrides
")LcB'C //{{AFX_VIRTUAL(CHookApp)
RGvfy/T public:
[Zc8tE2oN virtual BOOL InitInstance();
U[1Rw6 virtual int ExitInstance();
Ze_4MwCW //}}AFX_VIRTUAL
9bd $mp //{{AFX_MSG(CHookApp)
'r3yFoP} // NOTE - the ClassWizard will add and remove member functions here.
Y@N-q // DO NOT EDIT what you see in these blocks of generated code !
sw
A^oU //}}AFX_MSG
jz ;N&62| DECLARE_MESSAGE_MAP()
1{{z[w# };
ZqH.$nXP LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
f*U3s N^y BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
%>u(UmFO BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
KPc`5X BOOL InitHotkey();
U7i WYdt$ BOOL UnInit();
Hz39v44 #endif
AlF"1X02 Q |,(C0<G //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
=wbgZr^2 #include "stdafx.h"
\2F{r<A\@ #include "hook.h"
NbnahhS #include <windowsx.h>
"X<vgM^: #ifdef _DEBUG
6 z(7l #define new DEBUG_NEW
Ud@D%?A7 #undef THIS_FILE
ehehTP static char THIS_FILE[] = __FILE__;
~5S[Sl #endif
03Czx ` #define MAX_KEY 100
eU/o I} A #define CTRLBIT 0x04
,`kag~bZ #define ALTBIT 0x02
=Ts2a"n #define SHIFTBIT 0x01
?Vg251-H #pragma data_seg("shareddata")
IL*Ghq{/ HHOOK hHook =NULL;
Itaq4 ^CE UINT nHookCount =0;
5qZebD2a static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
%@Mv-A6) static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
V?pqKQL0 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
oihn`DY{ static int KeyCount =0;
o%Ubn* static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
39Nz>Nu: #pragma data_seg()
"&!7wH ,A HINSTANCE hins;
/Mq9~oC void VerifyWindow();
rvPY BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
\piB*"ln //{{AFX_MSG_MAP(CHookApp)
ITpo:"X g // NOTE - the ClassWizard will add and remove mapping macros here.
\0bao< // DO NOT EDIT what you see in these blocks of generated code!
l=+hs //}}AFX_MSG_MAP
">zK1t5= END_MESSAGE_MAP()
gl.uDO%. pf&H !-M CHookApp::CHookApp()
(tG8HwV- {
U1oZ\Mh // TODO: add construction code here,
K;uO<{a)r // Place all significant initialization in InitInstance
HRP }
^~dBO%M^ [Q0n-b,Q CHookApp theApp;
!UPKy$ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
irZMgRQAT {
p"l GR&b BOOL bProcessed=FALSE;
MZ$x(Vcj if(HC_ACTION==nCode)
ERka l7+ {
LpV2XL$p># if((lParam&0xc0000000)==0xc0000000){// Key up
/J@<e{&t~ switch(wParam)
Vv|%;5( {
<I
5F@pe' case VK_MENU:
ICvl;Q MaskBits&=~ALTBIT;
!!KA9mP break;
8D]&wBR: case VK_CONTROL:
9-B/n0 MaskBits&=~CTRLBIT;
e^ Aw%t break;
FqWW[Bgd case VK_SHIFT:
d+m}Z>iQ1O MaskBits&=~SHIFTBIT;
}Mv$Up break;
u)X]]6YJ default: //judge the key and send message
:ebu8H9f% break;
#aHJ|[[(n }
-!bfxbP for(int index=0;index<MAX_KEY;index++){
4`X]$. if(hCallWnd[index]==NULL)
b7uxCH]Z
continue;
Cf~vT" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
":I@>t{H* {
P*
Z1Rs_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
JKjVrx>
@ bProcessed=TRUE;
*#y9 Pve }
f*%Y]XL;% }
TWU[/>K }
+hZ{/ else if((lParam&0xc000ffff)==1){ //Key down
ByU&fx2Z switch(wParam)
Kb$6a'u7 {
L>3- z>u, case VK_MENU:
#qnK nxD MaskBits|=ALTBIT;
O-3R#sZ0 break;
)i^+=TZ q case VK_CONTROL:
Jc=~BT_G MaskBits|=CTRLBIT;
eV5
e:9
break;
>LAhc 7I case VK_SHIFT:
f,(@K% MaskBits|=SHIFTBIT;
6,raRg6 break;
;5dA default: //judge the key and send message
bxc!x>) break;
QJH(( }
xo
GX&^= for(int index=0;index<MAX_KEY;index++)
7*MjQzg-P {
O$*\JL if(hCallWnd[index]==NULL)
yDORL|
E' continue;
?PSJQ3BC| if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6Zx'$F.iqK {
:OKU@l| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
7`P1=`.. bProcessed=TRUE;
s
+Q'\? }
LLV1W0VO=P }
yhsbso,5 a }
j
e;^i,& if(!bProcessed){
=XhxD<kI for(int index=0;index<MAX_KEY;index++){
S=zW
wo$ if(hCallWnd[index]==NULL)
Ly_.%f continue;
qDK\MQ! if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
.L=C7 w1 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
=7vbcAJ\ }
D,,$ }
rvUJK,oE }
?l?_8y/ww return CallNextHookEx( hHook, nCode, wParam, lParam );
4_KRH1 }
FdE9k\E#/) G0mvrc-( BOOL InitHotkey()
lxh}N, {
_|C T|q if(hHook!=NULL){
IAFj_VWC0 nHookCount++;
"t>WM return TRUE;
+'`I]K> }
Yw6d-5=: else
W5U;{5 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
!#TM%w if(hHook!=NULL)
k:0nj!^4w> nHookCount++;
*USzzLq return (hHook!=NULL);
XJguw/[wm }
+rOfQ'lQ BOOL UnInit()
btDPP k' {
q+1SU6x'm if(nHookCount>1){
0N`'a?x nHookCount--;
cHw-; return TRUE;
M1,1J-h }
Aw,#oG {N BOOL unhooked = UnhookWindowsHookEx(hHook);
o#frNT} if(unhooked==TRUE){
omZ
bn nHookCount=0;
Uv|^k8( hHook=NULL;
E>L_$J -A- }
a-Ne!M[ return unhooked;
3IYbgUG }
r.10b]b [W--%=Ou BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]D\p<4uepM {
+]S!pyZ" BOOL bAdded=FALSE;
tK LAA+Z for(int index=0;index<MAX_KEY;index++){
be(p13&od if(hCallWnd[index]==0){
|>Wi5h{6X hCallWnd[index]=hWnd;
Y6ORI HotKey[index]=cKey;
M^?=!!US^ HotKeyMask[index]=cMask;
8
huB<^ bAdded=TRUE;
oh%/\Xu KeyCount++;
wg{Y6XyH break;
Mb\[` 4z }
e*/ya 8p? }
G}0fk]%\: return bAdded;
mP+rPDGp }
[+
N 5 O#@KP"8 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
J%ue{PL7 {
Ku<_N]9 BOOL bRemoved=FALSE;
&k0c|q] for(int index=0;index<MAX_KEY;index++){
(IIOVv
1J if(hCallWnd[index]==hWnd){
2@+MT z if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
%q5iy0~P hCallWnd[index]=NULL;
S$%Y{ HotKey[index]=0;
DOGg=`XK1 HotKeyMask[index]=0;
]qNPOnlp bRemoved=TRUE;
F<^93a9 KeyCount--;
%
ovk}}%; break;
h|
]BA}D }
+{/*P5 }
SPY4l*kX }
f')3~)" return bRemoved;
iT"H%{+~ }
@V5'+^O G[[NDK void VerifyWindow()
^bckl
tSo {
]J6+nA6)
for(int i=0;i<MAX_KEY;i++){
bmu<V1[W if(hCallWnd
!=NULL){ WA 79(B
if(!IsWindow(hCallWnd)){ G)wIxm$?0
hCallWnd=NULL; "K$
y(}C
HotKey=0; \`: LPe
HotKeyMask=0; ICI8xP}a?
KeyCount--; "G m:M
} !>L+q@l)
} ?.&?4*u
} tmf=1M
} 4,g3 c
#$(wfb9
BOOL CHookApp::InitInstance() z0m[25FQG
{ !kg)8 4C[
AFX_MANAGE_STATE(AfxGetStaticModuleState()); vy+9Q5@W
hins=AfxGetInstanceHandle(); j])nkm7_
InitHotkey(); iWNTI
return CWinApp::InitInstance(); )QiHe}
} R
WU,v{I9
qnZ`]?
int CHookApp::ExitInstance() ;o0o6pF
{ c&T14!lfn
VerifyWindow(); |~3$L\X
UnInit(); 3`aJ"qQE
return CWinApp::ExitInstance(); ,*$/2nB^
} tXIre-. 2}
Oz1ou[8k
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file /+F|+1
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) F ttny]
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ lt&30nf=
#if _MSC_VER > 1000 I NE,/a=
#pragma once ~IE5j,SC
#endif // _MSC_VER > 1000 TAu*lL(F
Ev\kq>2O
class CCaptureDlg : public CDialog K-}'Fiq
{ tFd^5A*
// Construction _\Cd.
public: 8Bnw//_pT
BOOL bTray; ^D0BGC&&
BOOL bRegistered; NX*9nwp^
BOOL RegisterHotkey(); CQcb !T
UCHAR cKey; 6c>tA2G|8
UCHAR cMask; !OJSQB,
void DeleteIcon(); 'k9hzk(*
void AddIcon(); S-:7P.#Q
UINT nCount; ?JD\pYg[/
void SaveBmp(); &sx|sLw)
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ptmPO4f
// Dialog Data pPG@_9qf
//{{AFX_DATA(CCaptureDlg) Gr;~P*
enum { IDD = IDD_CAPTURE_DIALOG }; )LYj,do
CComboBox m_Key; 6YZ&>`a^
BOOL m_bControl; #:68}f"$
BOOL m_bAlt; ku'%+svD
BOOL m_bShift; | We @p
CString m_Path; `<>8tZS9"
CString m_Number; >P=xzg79
//}}AFX_DATA ?mt$c6-
// ClassWizard generated virtual function overrides x./jTebeO
//{{AFX_VIRTUAL(CCaptureDlg) Sg<''pUh
public: [21tT/
virtual BOOL PreTranslateMessage(MSG* pMsg); gHlahg
protected: 00G[`a5
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support " I@Z:[=2
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); $XI5fa4Tt
//}}AFX_VIRTUAL "7)F";_(^
// Implementation d~|qx
protected: _ }!Q4K
HICON m_hIcon; YS{
// Generated message map functions %p2 C5z?
//{{AFX_MSG(CCaptureDlg)
+X;6%O;
virtual BOOL OnInitDialog(); SAG)vmm
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 4:<0i0)5
afx_msg void OnPaint(); 2.&v{gq
afx_msg HCURSOR OnQueryDragIcon(); $vy.BYFm
virtual void OnCancel(); u 3,b,p
afx_msg void OnAbout(); df1* [
afx_msg void OnBrowse(); =WEfo;
afx_msg void OnChange(); J7QlGm,=
//}}AFX_MSG SsznV}{^
DECLARE_MESSAGE_MAP() H[,.nH_>+
}; V6$v@Zq
#endif JpDYB
ooZ7HTP|
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file E7_^RWG
#include "stdafx.h" (I[o;0w
#include "Capture.h" _i8$!b2Mr
#include "CaptureDlg.h" _-8,}F}W#s
#include <windowsx.h> 7FDraEr#f
#pragma comment(lib,"hook.lib") ^1cqx]>E
#ifdef _DEBUG &`TX4b^/!
#define new DEBUG_NEW "4tRy9q
#undef THIS_FILE WejY
b;KS
static char THIS_FILE[] = __FILE__; C}1(@$
#endif ,+X8?9v
#define IDM_SHELL WM_USER+1 2s{yg%U(
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %?wuKZLnc
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tIr66'8
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Jx>P%>+<j
class CAboutDlg : public CDialog K5.C*|w
{ WJ.PPq>]F
public: 2hu6
CAboutDlg(); C3_*o>8
// Dialog Data W;-Qze\D
//{{AFX_DATA(CAboutDlg) k2@IJ~
enum { IDD = IDD_ABOUTBOX }; QHM39Eu]
//}}AFX_DATA ;:!LAe
// ClassWizard generated virtual function overrides _&z>Id`w
//{{AFX_VIRTUAL(CAboutDlg) gR( c;
protected: lT:<ZQyjT
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support FFQF0.@EBi
//}}AFX_VIRTUAL 'qM3.U
// Implementation h NoN=J
protected: Yr31GJ}K
//{{AFX_MSG(CAboutDlg) )T3wU~%
//}}AFX_MSG !.J~`Y'd_
DECLARE_MESSAGE_MAP() 'RA[_Z
}; 3|?fGT;P
K7l{&2>?
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) T#BOrT>V
{ 9qW,I|G
//{{AFX_DATA_INIT(CAboutDlg) lR(&Wc\j
//}}AFX_DATA_INIT zR
.MXr
} ='JX_U`A^F
*=Fcu@
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4Oy
c D
{ >r*Zm2($MR
CDialog::DoDataExchange(pDX); c1<g!Q&E
//{{AFX_DATA_MAP(CAboutDlg) &qU[wn:1
//}}AFX_DATA_MAP 5a`}DTB[Co
} Qh[t##I/
4mAtYm
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) =,'Z6?%p
//{{AFX_MSG_MAP(CAboutDlg) lrE0)B5F
// No message handlers Z~|J"2.
//}}AFX_MSG_MAP 1=X=jPwO C
END_MESSAGE_MAP() 4{?x(~
4_Jdh48-d
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) e>^R 8qM?
: CDialog(CCaptureDlg::IDD, pParent) ?*@h]4+k'
{ w s=T R
//{{AFX_DATA_INIT(CCaptureDlg) hmH$_YP}
m_bControl = FALSE; (+_J0i t
m_bAlt = FALSE; ,54<U~Lg:
m_bShift = FALSE; GN<I|mGLJK
m_Path = _T("c:\\"); hF~B&^dd.
m_Number = _T("0 picture captured."); rA`\we)
nCount=0; hLvv:C@
bRegistered=FALSE; 5dF=DCZ
bTray=FALSE; 6!nb)auVi
//}}AFX_DATA_INIT ASvPr*q/
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 vFOv
I Vp
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Em,!=v(*
} ;]Aa
fq|2E&&v
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)
%\cC]<>
{ o
FLrSmY)E
CDialog::DoDataExchange(pDX); Lvq]SzOw
//{{AFX_DATA_MAP(CCaptureDlg) c)8wO=!
DDX_Control(pDX, IDC_KEY, m_Key); (UZ*36@PJx
DDX_Check(pDX, IDC_CONTROL, m_bControl); 8ilbX)O
DDX_Check(pDX, IDC_ALT, m_bAlt); ?/(K7>`
DDX_Check(pDX, IDC_SHIFT, m_bShift); ".%LBs~$
DDX_Text(pDX, IDC_PATH, m_Path);
x]oQl^F
DDX_Text(pDX, IDC_NUMBER, m_Number); =!^iiHF
//}}AFX_DATA_MAP L{f>;[FR
} >~rd5xlk
$O'2oeM
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) SN(=e#ljE
//{{AFX_MSG_MAP(CCaptureDlg) ^-u HdafP
ON_WM_SYSCOMMAND() iyYY)roB
ON_WM_PAINT() V(u2{4gZ
ON_WM_QUERYDRAGICON() d~jtWd|?
ON_BN_CLICKED(ID_ABOUT, OnAbout) CLEG'bZa,
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) dyzwJ70K
ON_BN_CLICKED(ID_CHANGE, OnChange) (QSWb>np
//}}AFX_MSG_MAP Hi_Al,j:
END_MESSAGE_MAP() wLSZL
"g%:#'5
BOOL CCaptureDlg::OnInitDialog() \>Rwg=Lh
{ 4AOS}@~W
CDialog::OnInitDialog(); 0 jP00
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 4 Qel;
ASSERT(IDM_ABOUTBOX < 0xF000); _qt;{,t
CMenu* pSysMenu = GetSystemMenu(FALSE); : .o=F`W
if (pSysMenu != NULL) T[h}A"yK;
{ ,{?bM
CString strAboutMenu; (4ci=*3=
strAboutMenu.LoadString(IDS_ABOUTBOX); #IaBl?}r^
if (!strAboutMenu.IsEmpty()) _8li4;F
{ udD*E~1q
pSysMenu->AppendMenu(MF_SEPARATOR); U.Chf9a-
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {0vbC/?]
} n5k^v$'
} RA/ =w&
SetIcon(m_hIcon, TRUE); // Set big icon J)8pqa
SetIcon(m_hIcon, FALSE); // Set small icon /-{O\7-D
m_Key.SetCurSel(0); ]2\2/~l
RegisterHotkey(); [wio/wc
CMenu* pMenu=GetSystemMenu(FALSE); ).+xcv
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); t7oz9fSz=?
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); rfXF 01I
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); !|<f%UO
return TRUE; // return TRUE unless you set the focus to a control *K jVPs
} pmW6~%}*
_X%6 +0M
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) H"FflmUO
{ I"cQ5gF?A
if ((nID & 0xFFF0) == IDM_ABOUTBOX) x-V' 0-#U>
{ 1s}``1>
CAboutDlg dlgAbout; =!S@tuY
dlgAbout.DoModal(); ADyNNMcx
} Tt <-<oyU.
else _WDBG
{ 0J:U\S
CDialog::OnSysCommand(nID, lParam); <[3lV)~t
} )|Vg/S
} b*FU*)<4.
SEQO2`]e:
void CCaptureDlg::OnPaint() bm tJU3Rm
{ ?mYV\kDt\
if (IsIconic()) j |'#5H`
{ s;_#7x#
CPaintDC dc(this); // device context for painting tLXn?aNY
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); n$hqNsM
// Center icon in client rectangle HV*:<2P%D
int cxIcon = GetSystemMetrics(SM_CXICON); vN0L(B
int cyIcon = GetSystemMetrics(SM_CYICON); nF. ;LM
CRect rect; yo?g"vbE
GetClientRect(&rect); &Qtp"#{
int x = (rect.Width() - cxIcon + 1) / 2; f=_Bx2ub
int y = (rect.Height() - cyIcon + 1) / 2; lNh=>DPu
// Draw the icon ]*g ss'N
dc.DrawIcon(x, y, m_hIcon); A|
gs Uh
} !8
wid&
else SA`J.4yn
{ } `>J6y9
CDialog::OnPaint(); kKxL04
} %|`:5s-T%
} $dx1[V+_
6zp@#vYI
HCURSOR CCaptureDlg::OnQueryDragIcon() 6"7:44O;G
{ (!_X:+0_
return (HCURSOR) m_hIcon; r>@ B+Xi
} P,$[|)[E
2[8fFo>
void CCaptureDlg::OnCancel() de=5=>P7
{ U5On-T5
if(bTray) =0PNHO\gl
DeleteIcon(); ^B<PD]
CDialog::OnCancel(); 5S|}:~7T
} (b`4&sQ<
|i}+t
void CCaptureDlg::OnAbout() 8g#
c%eZ
{ c6?c>*z
CAboutDlg dlg; F;d%@E_Bc
dlg.DoModal(); 7E!";HT
} e-%7F]e
R<y Nv
void CCaptureDlg::OnBrowse() ,`%k'ecN
{ q19k<BqR
CString str; @H3 s2|
BROWSEINFO bi; }{#;;5KrB
char name[MAX_PATH]; ONr?.MJ6j
ZeroMemory(&bi,sizeof(BROWSEINFO)); :>tF_6
bi.hwndOwner=GetSafeHwnd(); Q
QsVIHA
bi.pszDisplayName=name; wL8bs-
U
bi.lpszTitle="Select folder"; (1kn):
bi.ulFlags=BIF_RETURNONLYFSDIRS; 'uP'P#
LPITEMIDLIST idl=SHBrowseForFolder(&bi); (opROsFh
if(idl==NULL) .KiPNTh'
return; B%%.@[o,
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <?>I\
str.ReleaseBuffer(); "%.|n|
m_Path=str; =RW*
%8C
if(str.GetAt(str.GetLength()-1)!='\\') <t?x 'r?@
m_Path+="\\"; q7O,I`KaJ
UpdateData(FALSE); 0%h[0jGj
} ; d, JN
KA|&Q<<{@
void CCaptureDlg::SaveBmp() eHVdZ'%x
{ r!=]Q}`F
CDC dc; ;1{iF2jZ:
dc.CreateDC("DISPLAY",NULL,NULL,NULL); %Lh-aP{[e
CBitmap bm; wE,=%?"
int Width=GetSystemMetrics(SM_CXSCREEN); I<D&,LFH*w
int Height=GetSystemMetrics(SM_CYSCREEN); i$`|Y*
bm.CreateCompatibleBitmap(&dc,Width,Height); P;)2*:--)
CDC tdc; "B|nh d
tdc.CreateCompatibleDC(&dc); dxzvPgi?
CBitmap*pOld=tdc.SelectObject(&bm); 8Ehy9<
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); G?Qe"4
.
tdc.SelectObject(pOld); L?3VyBE
BITMAP btm; l]a^"4L4`o
bm.GetBitmap(&btm); lF;ziF
DWORD size=btm.bmWidthBytes*btm.bmHeight;
Z #.GI
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); i#L6UKe:Q
BITMAPINFOHEADER bih; ALE808;|
bih.biBitCount=btm.bmBitsPixel; D:YN_J"kV
bih.biClrImportant=0; l1-4n*fU
bih.biClrUsed=0; -vv
bih.biCompression=0; $:%*gY4~76
bih.biHeight=btm.bmHeight; \&eY)^vw
bih.biPlanes=1; =gMaaGg p,
bih.biSize=sizeof(BITMAPINFOHEADER); ' +)6#/*
bih.biSizeImage=size; `7u\
bih.biWidth=btm.bmWidth; kdK*MUB
bih.biXPelsPerMeter=0; FX7Cjo#=R
bih.biYPelsPerMeter=0; >%iu!H"
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ]yyU)V0Iu
static int filecount=0; c0!Te'?
CString name; ?Ia4H
name.Format("pict%04d.bmp",filecount++); Ux_EpC
name=m_Path+name; gZw\*9Q9
BITMAPFILEHEADER bfh; 4 "pS
bfh.bfReserved1=bfh.bfReserved2=0; C$]5l;`
bfh.bfType=((WORD)('M'<< 8)|'B'); U-Af7qO
bfh.bfSize=54+size; #t"9TP
bfh.bfOffBits=54; vqrBRlZ
CFile bf; M*g2VyZ
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $x;tSJ)m~
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Nf=C?`L
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )x$!K[=
bf.WriteHuge(lpData,size); z{Hz;m:*_
bf.Close(); >[Xm|A#
nCount++; 2.StG(Y!
} WafdE
GlobalFreePtr(lpData); Q;XXgX#l
if(nCount==1) fl!mYCPv
m_Number.Format("%d picture captured.",nCount); #[no~&E
else C#A@)>
m_Number.Format("%d pictures captured.",nCount); )v${&H
UpdateData(FALSE); &tlR~?$e*
} ,DE(5iDS
'b LP~
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) er(8}]X8Q
{ CMC?R,d
if(pMsg -> message == WM_KEYDOWN) P/FrE~
{ MB}:GY?
if(pMsg -> wParam == VK_ESCAPE) .(`(chRa}
return TRUE; cj$,ob&DX
if(pMsg -> wParam == VK_RETURN) -0A@38, }
return TRUE; !Bag}|#
} ot-(4Y
return CDialog::PreTranslateMessage(pMsg); Ly^E& ,)
} X32RZ9y
5\uNEs$T
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *}+R{
{ FpP\-+Sl
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,)Yao;Cvd
SaveBmp(); 5?^]1P_
return FALSE; b0y-H/d/}
} G!AICcP^
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){
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CMenu pop; 0v;ve
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); R|/Wz/$1A
CMenu*pMenu=pop.GetSubMenu(0); #uQrJh1o8
pMenu->SetDefaultItem(ID_EXITICON); l>A\V)
CPoint pt; 5kK=S
GetCursorPos(&pt); j1'\R+4U
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CoKiQUW
if(id==ID_EXITICON) Us1@\|]
DeleteIcon(); !.9l4@z#
else if(id==ID_EXIT) 5r'=O2AZX
OnCancel(); Sq?,C&LsA
return FALSE; EJO.'vQ
} 4;?1Kb#
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?A|zRj{
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) <MRC%!.
AddIcon(); )8:n}w
return res; <inl{CX/
} %wOOzp`
#1MKEfv(~
void CCaptureDlg::AddIcon() 2q12yY f
{ N0]z/}hd@
NOTIFYICONDATA data; B<A:_'g
data.cbSize=sizeof(NOTIFYICONDATA); _wMc*kjJO
CString tip; mG
X\wta
tip.LoadString(IDS_ICONTIP); P<8LAc$T
data.hIcon=GetIcon(0); yxqTm%?y
data.hWnd=GetSafeHwnd(); wyp{KIV
strcpy(data.szTip,tip); H1Q''$}Z.
data.uCallbackMessage=IDM_SHELL; Mk<m6E$L
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; IT,"8s
data.uID=98; QDP-E[
Shell_NotifyIcon(NIM_ADD,&data); SzRL}}I
ShowWindow(SW_HIDE); 2%bhW,?I
bTray=TRUE; :g&>D#{
} GX7VlI[
m{VL\ g)
void CCaptureDlg::DeleteIcon() SF0Jb"kS
{ !5NGlqEF#
NOTIFYICONDATA data; S
9WawI
data.cbSize=sizeof(NOTIFYICONDATA); Lg8]dBXu
data.hWnd=GetSafeHwnd(); D4d]3|/T
data.uID=98; *`%4loW
Shell_NotifyIcon(NIM_DELETE,&data); ~M*7N@D
ShowWindow(SW_SHOW); dZF8R
SetForegroundWindow(); 'HCnB]1
ShowWindow(SW_SHOWNORMAL); D^$]>-^
bTray=FALSE; S=4R5igrC
} V_jiOT!
+5#x6[
void CCaptureDlg::OnChange() !TGr .R
{ P?xA$_+
RegisterHotkey(); nz>K{(
} }lH;[+u3
fD0{ 5
BOOL CCaptureDlg::RegisterHotkey() CDJ$hu
{ Il|GCj*N
UpdateData(); ^[0"vtb
UCHAR mask=0; 8*vFdoE_oO
UCHAR key=0; li@kLh
if(m_bControl) Urn
mask|=4; :u
AjV
if(m_bAlt) tO7I&LNE
mask|=2; bZu$0IG
if(m_bShift) L,6MF,vx
mask|=1; @$Yb#$/
key=Key_Table[m_Key.GetCurSel()]; rj}(muM,R
if(bRegistered){ D6Dn&/>Zp
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Rw/Ciw2@?
bRegistered=FALSE; nVNs][
} @Zj&`/
cMask=mask; HXyFj
cKey=key; Q@3B{
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1}`2\3,
return bRegistered; rJX\6{V!_
} !F-sA: xq
_;#9!"&
四、小结 2av*o~|J*:
W|0My0y
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。