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:
1f+z[ad&^
r0Zj'F_e 一、实现方法
/g>]J70 >:bXw#w] 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:
2Rqpok4 _<6E>"*m #pragma data_seg("shareddata")
F Jp<J HHOOK hHook =NULL; //钩子句柄
(kVxa8 0 UINT nHookCount =0; //挂接的程序数目
OI,F,4e static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
I{$TMkh[ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
yR% l[/ X static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
c;,-I static int KeyCount =0;
Obx!>mI^6 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
C';Dc4j #pragma data_seg()
~bqw !rz \Ez&?yb/ 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。
N(kSE^skOa |&MOus#v 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:
zWrynJ}s ,z01*Yx BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
X"V)oC cKey,UCHAR cMask)
<Zo{D |hW {
19:1n]*X< BOOL bAdded=FALSE;
OWp`Wat for(int index=0;index<MAX_KEY;index++){
6st^-L if(hCallWnd[index]==0){
\('WS[$2 hCallWnd[index]=hWnd;
EeQ2\'t HotKey[index]=cKey;
Eb8~i_B- HotKeyMask[index]=cMask;
OGcW]i bAdded=TRUE;
y\n#`*5k KeyCount++;
YB_fy8Tfx break;
h%5keiA }
\D-X
_.v }
F9>"1 return bAdded;
!ZM*)6^ }
y:Ag mr,S //删除热键
ba)hWtenH BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ctPT=i60 {
{*"\68e BOOL bRemoved=FALSE;
8yybZ@ for(int index=0;index<MAX_KEY;index++){
4WPco"xH! if(hCallWnd[index]==hWnd){
z%nplG'~| if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
L=5Y^f'aU hCallWnd[index]=NULL;
" eS-i@ HotKey[index]=0;
/2cn`dR, HotKeyMask[index]=0;
k&:~l@?O bRemoved=TRUE;
hP_{$c{4:g KeyCount--;
s6D Pb_, break;
DG,m;vg+ }
!FQS9SoO9 }
paUJq?Af }
4 g8t return bRemoved;
8mC$p6Okd }
Z^ .qX\<M sfp.> bMj id)J;!^;J DLL中的钩子函数如下:
aNgJm~K0P 'X~CrgQl LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
1i#U& {
lr[&*v?h BOOL bProcessed=FALSE;
R8|FqBs
if(HC_ACTION==nCode)
0IQ|`C. {
]sqp^tQ`e if((lParam&0xc0000000)==0xc0000000){// 有键松开
{DX1/49 switch(wParam)
w ; PV
&M {
KssIoP case VK_MENU:
N::.o+1 MaskBits&=~ALTBIT;
?Hbi[YD break;
nIl<2H]F` case VK_CONTROL:
lgC^32y MaskBits&=~CTRLBIT;
f|,2u5
;z break;
ze`qf% case VK_SHIFT:
N8Un42 MaskBits&=~SHIFTBIT;
iJk/fvi break;
bQwiJ`B& default: //judge the key and send message
!^3j9<|@' break;
:Ek3]`q# }
Yt;@@xe& for(int index=0;index<MAX_KEY;index++){
[[Usrbf if(hCallWnd[index]==NULL)
|RI77b:pX continue;
aT=V/Xh}d if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
X6oY-4O {
xKoNo^ FF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
u"zQh| bProcessed=TRUE;
WhL1OG }
gC/-7/} }
.DcuJC= }
(d-j/v*4 else if((lParam&0xc000ffff)==1){ //有键按下
g%d&>y?1r switch(wParam)
pl.=u0 * {
mW U*}-M case VK_MENU:
7h.:XlUm| MaskBits|=ALTBIT;
$]iRfXv,l! break;
u=6{P(5$j case VK_CONTROL:
WR>2t&;E MaskBits|=CTRLBIT;
++0xa%: break;
o#F0 3 case VK_SHIFT:
1H,hw MaskBits|=SHIFTBIT;
S?m4 break;
N+NS\Y5 default: //judge the key and send message
bq`0$c%hN break;
q,eXH8 x }
;?:X_C for(int index=0;index<MAX_KEY;index++){
R P6R1iN3 if(hCallWnd[index]==NULL)
~TALpd continue;
O:G-I$F| if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]6EXaf# {
>a1ovKF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
h3:dO|Z bProcessed=TRUE;
?\Z-3l%M }
#&c}in"! }
<ba+7CK]w }
-* ;`~5 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Xa32p_|5~ for(int index=0;index<MAX_KEY;index++){
Qws#v}xF if(hCallWnd[index]==NULL)
ni x1_Wo; continue;
awa$o if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
zos#B30 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
h|Uy!?l
//lParam的意义可看MSDN中WM_KEYDOWN部分
=2[U4<d!R }
t Sf` }
goV[C]| }
VR9C< tMSi return CallNextHookEx( hHook, nCode, wParam, lParam );
6?c(ue iL[ }
&D~70N\L #0j,1NpL 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
\
>(;t#> ~V4&l3o BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
_*Z2</5 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
,HdFE| N;6WfdA- 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
sx0:g?F3j ]n:)W.|`R LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
O{9h'JU {
<ctn_"p Z if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
[UHDN:y {
(9J,Qs[; //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
=N zA2td SaveBmp();
{<- BU[H return FALSE;
NwdA@"YQ| }
eOQUy+ …… //其它处理及默认处理
]S~Z8T-[ }
mSzBNvci rE
bC_< \Podyh/;? 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
/*bS~7f1 ZAPT5 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
r^k:$wJbRK [a*m9F\ , 二、编程步骤
h+x"?^ G8lR_gD"! 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";
( {H5k'' %Y` @>P' 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
451r!U1Z +]Y&las 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;
i(JBBE" 1TKOvy_ 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;
h&Ehp \z<B=RT\ 5、 添加代码,编译运行程序。
}06
)dJaF#6j 三、程序代码
0=;jGh}|i m[C-/f^u| ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
~n84x #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
+xwz.::: #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
})|+tZ #if _MSC_VER > 1000
)>Oip #pragma once
F+_4Q #endif // _MSC_VER > 1000
tZ[Y~],F #ifndef __AFXWIN_H__
02} &h #error include 'stdafx.h' before including this file for PCH
\c+)Y}:D #endif
*tjE#TW #include "resource.h" // main symbols
a$g4)0eS class CHookApp : public CWinApp
0CxQ@~ttl {
-L6 rXQV@j public:
k=O2s'F` CHookApp();
0iW]#O/ // Overrides
UcDJ%vI // ClassWizard generated virtual function overrides
z_eP //{{AFX_VIRTUAL(CHookApp)
?^us(o7- public:
r:y*l4 virtual BOOL InitInstance();
SHPaSq'&N virtual int ExitInstance();
&3>ki0L //}}AFX_VIRTUAL
r+0"1\f3 //{{AFX_MSG(CHookApp)
Va06(Cq // NOTE - the ClassWizard will add and remove member functions here.
y>u+.z a| // DO NOT EDIT what you see in these blocks of generated code !
%FQMB //}}AFX_MSG
Bm%:Qc* DECLARE_MESSAGE_MAP()
(^Xp\dyZL };
Ywt_h;: LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
'!Vn BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
XZA3TZ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
` &|Rs BOOL InitHotkey();
Vf*!m~]Vqi BOOL UnInit();
0^|)[2m! #endif
/H@k;o Fg?Gx(g4 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
+GgWd=X.Y #include "stdafx.h"
}+QgRGQ #include "hook.h"
31wact^ #include <windowsx.h>
/9|1eSUa #ifdef _DEBUG
1#Dpj.cO# #define new DEBUG_NEW
FJv=5L #undef THIS_FILE
];^A8? static char THIS_FILE[] = __FILE__;
t</rvAH E #endif
Q}W6?XDu #define MAX_KEY 100
oKz|hks[6 #define CTRLBIT 0x04
*(s+u~, I #define ALTBIT 0x02
57)S" #define SHIFTBIT 0x01
,|"tLN*m #pragma data_seg("shareddata")
BkJV{>?_+ HHOOK hHook =NULL;
ss% ahs UINT nHookCount =0;
G|Ic6Sd static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Dz]&|5'N static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Gk8"fs static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
>z
h static int KeyCount =0;
uezqC=v$h static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
hv}rA,Yd #pragma data_seg()
$/5Jc[Ow HINSTANCE hins;
2JYyvJ> void VerifyWindow();
]/HSlT= BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
y^pk)`y8 //{{AFX_MSG_MAP(CHookApp)
lOPCM1Se // NOTE - the ClassWizard will add and remove mapping macros here.
gf2l19aP // DO NOT EDIT what you see in these blocks of generated code!
S$+vRX7 //}}AFX_MSG_MAP
8}\VlH] END_MESSAGE_MAP()
%(Nu"3|$K= bAeC=?U CHookApp::CHookApp()
@ _U]U {
F5gL-\6 // TODO: add construction code here,
?a7PxD. // Place all significant initialization in InitInstance
c#$B;? }
CVo@zr$ )(9>r/bq CHookApp theApp;
O>wGc8Of\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
S WVeUL#5 {
2Auhv!xV BOOL bProcessed=FALSE;
1<fS&)^W if(HC_ACTION==nCode)
rBkLwJ] {
KIC5U50J if((lParam&0xc0000000)==0xc0000000){// Key up
"nU5c4
switch(wParam)
36*"oD=@ {
tlV> case VK_MENU:
'~VKH}b MaskBits&=~ALTBIT;
Z%y>q|: break;
*j?tcxq case VK_CONTROL:
xpxUn8. MaskBits&=~CTRLBIT;
fB:9:NX break;
JC(rSs* case VK_SHIFT:
Sf
B+;i'D MaskBits&=~SHIFTBIT;
z~L''X7g break;
[pUw(KV2m default: //judge the key and send message
A`TVV break;
9AD`,]b }
"yCCei,hA? for(int index=0;index<MAX_KEY;index++){
^I~2t|} if(hCallWnd[index]==NULL)
"fdgBso continue;
yMq&9R9F if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=MEv{9_ {
=${]j SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
gV$j ] bProcessed=TRUE;
`utv@9 _z }
n1 =B }
_7'9omq@ }
l~;H~h!h/ else if((lParam&0xc000ffff)==1){ //Key down
0;2i"mzS\ switch(wParam)
rmu5K$pl {
V&;1n case VK_MENU:
6v(}<2~ MaskBits|=ALTBIT;
.+MJ' bW break;
E0!}~Z) case VK_CONTROL:
n1m[7s.[& MaskBits|=CTRLBIT;
OSQZ5:g| break;
{a\O7$A\F case VK_SHIFT:
,;)Y1q}Q MaskBits|=SHIFTBIT;
$}_N379& break;
GR@!mf default: //judge the key and send message
n0F.Um break;
lT#&\JQ
}
<cNXe4( for(int index=0;index<MAX_KEY;index++)
GL[#XB>n {
_*7h1[,{f if(hCallWnd[index]==NULL)
L`;p.L
Bs_ continue;
v#0F1a?]D if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#no~g(!o {
T]-yTsto SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
l9KLP bProcessed=TRUE;
%KHO}gad1 }
5Ds/^fA }
Jz7a|pgep }
c[\ :^w^I6 if(!bProcessed){
'kb5pl~U for(int index=0;index<MAX_KEY;index++){
>$SP2(Y~ if(hCallWnd[index]==NULL)
(DJLq continue;
QEKSbxL\W if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
\95qH,w)T SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
_;(`u!@/{ }
+^ a9i5 }
O4RNt,?l }
}/&Q\Sc return CallNextHookEx( hHook, nCode, wParam, lParam );
.Uq?SmK }
(;v)0&h Lh3>xZy"-z BOOL InitHotkey()
_a1 =? {
`q|&;wP. if(hHook!=NULL){
cpvN
}G nHookCount++;
D,q=?~ return TRUE;
x{{QS$6v }
7?Q@Hj(:NT else
Xou1X$$z hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
uw! if(hHook!=NULL)
!`=ms1%U nHookCount++;
+13h* return (hHook!=NULL);
e~R;
2bk }
Vij P; BOOL UnInit()
XndGe=O {
X8~dFjhX if(nHookCount>1){
NbOeF7cq+ nHookCount--;
'f&o%5] return TRUE;
'F%4[3a$\n }
^kZfE"iE2 BOOL unhooked = UnhookWindowsHookEx(hHook);
!Ic;;< if(unhooked==TRUE){
2WQKj9iyN
nHookCount=0;
S\fEV" hHook=NULL;
:#D?b.= }
X"WKgC g$ return unhooked;
@sQ^6FK0G }
q/y4HT,x &:}e`u@5| BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,XT#V\qne {
H.-jBFt} BOOL bAdded=FALSE;
dFY]~_P472 for(int index=0;index<MAX_KEY;index++){
Rs+rlJq if(hCallWnd[index]==0){
:g)0-gN hCallWnd[index]=hWnd;
EvZ;i^.8LS HotKey[index]=cKey;
n]M1'yU HotKeyMask[index]=cMask;
[ZwZGAP bAdded=TRUE;
D|-^}I4 KeyCount++;
FR~YO|4? break;
<p@c%e,_ }
YnnpgR. }
A
?"(5da. return bAdded;
rM<lPMr1* }
!sda6?& 89@\AjI BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
49f- u {
{FzL@!|| BOOL bRemoved=FALSE;
[8*Ovd for(int index=0;index<MAX_KEY;index++){
8r
' if(hCallWnd[index]==hWnd){
(]7*Kq if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
wX}N=== hCallWnd[index]=NULL;
dz/'
m7 HotKey[index]=0;
CU=}]Y HotKeyMask[index]=0;
\)'nxFKqV bRemoved=TRUE;
5 e:Urv77 KeyCount--;
?wE@9g A break;
hoxn! x$? }
[% chN/ }
4 -)'a} O }
{Z[yY6Nu return bRemoved;
ZJ(/cD }
%bf+Y7m r\]yq-_ void VerifyWindow()
PoMkFG6 {
VlKy6PSIg for(int i=0;i<MAX_KEY;i++){
G yZYP\'S+ if(hCallWnd
!=NULL){ s
vn[c*
if(!IsWindow(hCallWnd)){ @C)O[&Sk
hCallWnd=NULL; `mPmEV<
HotKey=0; mhTpR0
HotKeyMask=0; Z4FyuWc3
KeyCount--; /nXp5g^6(
} ^}; 4r
} *D`qcv
} sh.xp8^)^>
} E
[JXQ76
K#M
h
BOOL CHookApp::InitInstance() ,2S
<#p!
{ )gdv!
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;ak3@Uee
hins=AfxGetInstanceHandle(); gd<8RVA
InitHotkey(); j`Lf/S!}
return CWinApp::InitInstance(); -Nmf}`_
} |Hn[XRsf
zO{$kT\r&
int CHookApp::ExitInstance() []Cvma1\
{ oTtmn,
T
VerifyWindow(); tW5\Ktjno
UnInit(); UwtOlV:G{
return CWinApp::ExitInstance(); "M6a_rZ2W
} ;a!o$y
!s,<hU#
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file jIE>t5 fy
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) /Nq!^=
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .G+}Kn9!
#if _MSC_VER > 1000 (PGmA>BT
#pragma once U[d/`
#endif // _MSC_VER > 1000 YN] w_=
|Ix6D
class CCaptureDlg : public CDialog (Wr;:3i
{ ,r5<v_
// Construction Z{#^lhHx
public: 3iYz<M
BOOL bTray; 2a.NWJS
BOOL bRegistered; t^?8Di\
BOOL RegisterHotkey(); 0vG}c5;F
UCHAR cKey; 4W9!_:j(j
UCHAR cMask; yG&kP:k<
void DeleteIcon(); q^sMJ
void AddIcon(); sxL;o>{
UINT nCount; w:FH2*
void SaveBmp(); 7~\Dzcfk"P
CCaptureDlg(CWnd* pParent = NULL); // standard constructor JmNeqpbB`w
// Dialog Data N)Qj^bD!
//{{AFX_DATA(CCaptureDlg) |L;'In
enum { IDD = IDD_CAPTURE_DIALOG }; =)M 8>>l
CComboBox m_Key; &Wd,l$P<O
BOOL m_bControl; {\|? {8f
BOOL m_bAlt; (m;P,*
BOOL m_bShift; lk.Q6saI1
CString m_Path; 3JW9G04.
CString m_Number; t{~"vD9Am
//}}AFX_DATA #a#~YSnG
// ClassWizard generated virtual function overrides mMN oR]
//{{AFX_VIRTUAL(CCaptureDlg) ^\N2
Iu>6
public: :#TJ-l:#
virtual BOOL PreTranslateMessage(MSG* pMsg); W<!q>8Xn?
protected: W}L=JJo},
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support jLr8?Hyf
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); o*p7/KvoT
//}}AFX_VIRTUAL $L</{bXW
// Implementation KXw
\N!
protected: nOQ+oqM<
HICON m_hIcon; 1<\cMY6
// Generated message map functions eg(xN/D
//{{AFX_MSG(CCaptureDlg) P]Gsc
virtual BOOL OnInitDialog(); ](MXP,R
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); R$6Y\ *L[
afx_msg void OnPaint(); ]
{NY;|&I'
afx_msg HCURSOR OnQueryDragIcon(); Ix:aHl
virtual void OnCancel(); I$f:K]|.m!
afx_msg void OnAbout(); =1yUH9\,b
afx_msg void OnBrowse(); ; UrwK
afx_msg void OnChange(); ,}{E+e5jh7
//}}AFX_MSG D%^EG8i n.
DECLARE_MESSAGE_MAP() 44%::Oh
}; G Q8I |E
#endif E/U1g4S
I">z#@CT
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 0w+hf3K+:
#include "stdafx.h" *[.\S3K`
#include "Capture.h" &7@6Y{!/
#include "CaptureDlg.h" ?R,^prW{
#include <windowsx.h> K03a@:
#pragma comment(lib,"hook.lib") Z]SCIU @+
#ifdef _DEBUG 1GEE ^Eu
#define new DEBUG_NEW =,T~F3pK
#undef THIS_FILE t4gD*j6J3
static char THIS_FILE[] = __FILE__; #mllVQ
#endif i}wu+<Mk
#define IDM_SHELL WM_USER+1 v11mu2
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); up:e0di{
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1]hMA\x
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; mD )Nh
class CAboutDlg : public CDialog 3Ji,n;QLm
{ ;OdUH
public: @L0wd>
CAboutDlg(); ^1Yx'ua'
// Dialog Data RIJBHOa
//{{AFX_DATA(CAboutDlg) @Rx/]wyH
enum { IDD = IDD_ABOUTBOX }; 8tdUnh%/
//}}AFX_DATA @'}X&TN<a
// ClassWizard generated virtual function overrides " g_\W
//{{AFX_VIRTUAL(CAboutDlg) RisrU
protected: we} sC,
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S>"dUM
//}}AFX_VIRTUAL :_e.ch:4
// Implementation =r_ SMTu
protected: :\bttPw5
//{{AFX_MSG(CAboutDlg) g:2/!tujL
//}}AFX_MSG ,$}Q#q
DECLARE_MESSAGE_MAP() P{}Oe
*9"
}; Cog:6Gnw
-Z;:_"&9
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @ym7hk.
{ |/<iydP
//{{AFX_DATA_INIT(CAboutDlg) @C!q S7k)
//}}AFX_DATA_INIT -_314j=`/
} mYy3KqYu
Br yMq !
void CAboutDlg::DoDataExchange(CDataExchange* pDX) gq0gr?
{ 9Q.j
<
CDialog::DoDataExchange(pDX); fe0 Y^vW
//{{AFX_DATA_MAP(CAboutDlg) ]3I_H+hU
//}}AFX_DATA_MAP 6C3y+@9
} ';lO[B
8bK}&*z<
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) sV*Q8b*
//{{AFX_MSG_MAP(CAboutDlg)
A{c6XQR~z
// No message handlers ,%jJ
,G,
//}}AFX_MSG_MAP -#i%4[v
END_MESSAGE_MAP() S3=J1R,
CjST*(,b
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %idnm
: CDialog(CCaptureDlg::IDD, pParent) V2y[IeSQ
{ ,J~1~fg89
//{{AFX_DATA_INIT(CCaptureDlg) A%2!Hr
m_bControl = FALSE; _E"[%
m_bAlt = FALSE; %!=YNm
m_bShift = FALSE; ?3|ZS8y
m_Path = _T("c:\\"); s=d?}.E$
m_Number = _T("0 picture captured."); rcbixOT
nCount=0; `C()H@;
bRegistered=FALSE; asJYGqdF
bTray=FALSE; z7K?rgH
//}}AFX_DATA_INIT vx4&
;2
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 3dM6zOK
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); %*/[aq, #
} iKK=A.g
dHu]wog
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 'Oc8[8
{ ]6aM %r=c
CDialog::DoDataExchange(pDX); kQb0pfYs
//{{AFX_DATA_MAP(CCaptureDlg) Oh^X^*I$@
DDX_Control(pDX, IDC_KEY, m_Key); BNByaC
DDX_Check(pDX, IDC_CONTROL, m_bControl); td m{
V
st
DDX_Check(pDX, IDC_ALT, m_bAlt); O3_Mrn(R
DDX_Check(pDX, IDC_SHIFT, m_bShift); ZD<,h`
lZ
DDX_Text(pDX, IDC_PATH, m_Path); tyDtwV|
DDX_Text(pDX, IDC_NUMBER, m_Number); fg9sZ%67]\
//}}AFX_DATA_MAP 0N}5sF
} m=K XMX
Kzm_AHA)
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =#u2Rx%V
//{{AFX_MSG_MAP(CCaptureDlg) q[#\qT&QU
ON_WM_SYSCOMMAND() }Q%>Fv
ON_WM_PAINT() m<yA]
';s
ON_WM_QUERYDRAGICON() 2iGRw4`_a
ON_BN_CLICKED(ID_ABOUT, OnAbout) CxRp$;rk
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ~U1iB
ON_BN_CLICKED(ID_CHANGE, OnChange) V.4j?\#%
//}}AFX_MSG_MAP ZJ4"QsF
END_MESSAGE_MAP() ^Y&Cm.w
G^R;~J*TDE
BOOL CCaptureDlg::OnInitDialog() aw 7f$Fqk
{ 1_t Dp&UO
CDialog::OnInitDialog(); 8iCIs=06
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); D;L :a`Y
ASSERT(IDM_ABOUTBOX < 0xF000); </%H 'V@
CMenu* pSysMenu = GetSystemMenu(FALSE); T/K.'92S
if (pSysMenu != NULL) KZE.}8^%D
{ *"5a5.`%,
CString strAboutMenu; 6?lg
6a/eO
strAboutMenu.LoadString(IDS_ABOUTBOX); W(8g3
if (!strAboutMenu.IsEmpty()) d3$<|mG$
{ )k1,oUx
pSysMenu->AppendMenu(MF_SEPARATOR); v Y\O=TZT
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `SW
" RLS3
} N|j.@K
} So^`L s;S
SetIcon(m_hIcon, TRUE); // Set big icon [E^X=+Jnz
SetIcon(m_hIcon, FALSE); // Set small icon lEDHx[q
m_Key.SetCurSel(0); [0LqZ<\5
RegisterHotkey(); 10rGA=x'(
CMenu* pMenu=GetSystemMenu(FALSE); g?VME]:
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); YUb,5Y0
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 'k67$H
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^;3rdBprm
return TRUE; // return TRUE unless you set the focus to a control 5{a(
+'
} a7|&Tbv
]*@$%iCPE
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) "6dbRo5%
{ Fdw[CYHz
if ((nID & 0xFFF0) == IDM_ABOUTBOX) $ddYH
{ _e_%U<\4
CAboutDlg dlgAbout; #[W[|m
dlgAbout.DoModal(); iq:[+
} qlJOb}$ I
else LPn}QzH
{ cQ41NX@I
CDialog::OnSysCommand(nID, lParam); X-,y[ )
} \ Sby(l
} zrO|L|F&P
1.H!A@
void CCaptureDlg::OnPaint() 4Jr[8P0/A9
{ *`-29eR"8
if (IsIconic()) KL mB
{ emB D@r
CPaintDC dc(this); // device context for painting kA;Tr4EA6
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4.B*B3
// Center icon in client rectangle !O6Is'%B
int cxIcon = GetSystemMetrics(SM_CXICON); ()#tR^T
int cyIcon = GetSystemMetrics(SM_CYICON); Y^Q|l%Qrb
CRect rect; g<4M!gi
GetClientRect(&rect); Z{4aGp*
int x = (rect.Width() - cxIcon + 1) / 2; "EYjY->
int y = (rect.Height() - cyIcon + 1) / 2; 0r ;
nz]'
// Draw the icon 50aWFJYw
dc.DrawIcon(x, y, m_hIcon); ].P(/~FS9
} zZc@;S#
else {U '&9_y
{ RhNaYO
CDialog::OnPaint(); R(83E
B~_
} bM0[V5:jB
} K_|~3g
Fg\| e%
HCURSOR CCaptureDlg::OnQueryDragIcon() j~S!!Z]
{ %)Uvf`Xhh4
return (HCURSOR) m_hIcon; H\+c'$
} B=bI'S8\
%Fg8l{H3
void CCaptureDlg::OnCancel() e_k
_ty`
{ XH:gQ 9FD
if(bTray) vZeYp
DeleteIcon(); MupW=3.38
CDialog::OnCancel(); n~ >h4=h
} x~9z`d{!
sp
Q4m
void CCaptureDlg::OnAbout() :n4:@L<%H
{ +#uNQ`1v
CAboutDlg dlg; vMX6Bg8
dlg.DoModal(); "-QRkif
} aDl,
K;GL
n*m"L|:ff
void CCaptureDlg::OnBrowse() Qyv'nx0=
{ Q_kT}6#(J=
CString str; :DMHezaU
BROWSEINFO bi; t&9as}
char name[MAX_PATH]; qbU1qF/
ZeroMemory(&bi,sizeof(BROWSEINFO)); a()6bRc~T
bi.hwndOwner=GetSafeHwnd(); YNg\"XjJM<
bi.pszDisplayName=name; 'lN*Ys iDi
bi.lpszTitle="Select folder"; % O&m#)|
bi.ulFlags=BIF_RETURNONLYFSDIRS; C^,4`OI
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 5hJYy`h~
if(idl==NULL) \)otu\3/
return; Rnj Jg?I=
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); G/fP(o-Wd
str.ReleaseBuffer(); s("Cn/ZkS
m_Path=str; +f
X}O9
if(str.GetAt(str.GetLength()-1)!='\\') MvZ+n
m_Path+="\\"; @L[PW@:SZ
UpdateData(FALSE); \[[TlB>
} /o|PA:6J
(ET ;LH3
void CCaptureDlg::SaveBmp() M<A;IOpR+
{ 0q[p{_t`
CDC dc; Mhv1K|4s
dc.CreateDC("DISPLAY",NULL,NULL,NULL); jr,&=C(
CBitmap bm; Ha)3i{OM
int Width=GetSystemMetrics(SM_CXSCREEN); @],6SKbG6
int Height=GetSystemMetrics(SM_CYSCREEN); >'} Y1_S5
bm.CreateCompatibleBitmap(&dc,Width,Height); ~aJW"\{
CDC tdc; I|g@W_
tdc.CreateCompatibleDC(&dc); NK7H,V}T
CBitmap*pOld=tdc.SelectObject(&bm); 0" U5oP[
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,DQGv_
tdc.SelectObject(pOld); gp~yt0AU
BITMAP btm; SON^CvMs{
bm.GetBitmap(&btm); T-a&e9B
DWORD size=btm.bmWidthBytes*btm.bmHeight; g08*}0-k
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); '}jf#C1$c
BITMAPINFOHEADER bih; xm<v"><
bih.biBitCount=btm.bmBitsPixel; FOOQ'o[}
bih.biClrImportant=0; ^>N8*=y
bih.biClrUsed=0; M82.khm~jM
bih.biCompression=0; k{gl^
bih.biHeight=btm.bmHeight; VHXI@UT*
bih.biPlanes=1; +1otn~(E
bih.biSize=sizeof(BITMAPINFOHEADER); |d,F-9iw
bih.biSizeImage=size; oLgg
bih.biWidth=btm.bmWidth; &MCy.(jN
bih.biXPelsPerMeter=0; #v{ Y=$L
bih.biYPelsPerMeter=0; `TUZZz
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); sW
}<zGYd
static int filecount=0; [/
AIKZM<
CString name; u3U4UK
name.Format("pict%04d.bmp",filecount++); xC<=~(
name=m_Path+name; )VNM/o%Q
BITMAPFILEHEADER bfh; J!rY
6[t
bfh.bfReserved1=bfh.bfReserved2=0; oFWt(r
bfh.bfType=((WORD)('M'<< 8)|'B'); {}V$`L8
bfh.bfSize=54+size; DW#Bfo
bfh.bfOffBits=54; n'THe|:I
CFile bf; yH*hL0mO
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ FC6x Fg^
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +}P%HH]E/p
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); k!T|)\nc+
bf.WriteHuge(lpData,size); Odm#wL~E
bf.Close(); zG_p"Z7,
nCount++; X:>$8 ^gS
} JjQ8|En
GlobalFreePtr(lpData); 1Q]Rd
if(nCount==1) UEzsDJu
m_Number.Format("%d picture captured.",nCount); cv2]*
else C\7u<2c
m_Number.Format("%d pictures captured.",nCount); hi!`9k
UpdateData(FALSE); ^o YPyk`9
} ]nQ+nH
1pK6=-3w3
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) </= CZy5w
{ >)Ioo$B
if(pMsg -> message == WM_KEYDOWN) TXjloGv^
{ Wbe0ZnM]
if(pMsg -> wParam == VK_ESCAPE) 8!&nKy<Y
return TRUE; TjxA#D)
if(pMsg -> wParam == VK_RETURN) Ry&q1j
return TRUE; r$ =qQ7^#
} A^ViDP
return CDialog::PreTranslateMessage(pMsg); Z&Ue|Z4Qt
} Z0-ytODII
Ql8bt77eI-
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V>Fesm"aq
{ #n3ykzoqIX
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?R|th Z
SaveBmp(); `N}d}O8
return FALSE; rFey4zzz
} %m eLW&
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ v8m`jxII64
CMenu pop; ~EEs}i
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); <*<U!J-i
CMenu*pMenu=pop.GetSubMenu(0); 6V1:qp/6
pMenu->SetDefaultItem(ID_EXITICON); )T1iN(Z
CPoint pt; yS!(Ap
GetCursorPos(&pt); io.]'">
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?'eq",c#4N
if(id==ID_EXITICON) "UG
K8x
DeleteIcon(); NLyXBV[hV
else if(id==ID_EXIT) O- #TZ
OnCancel(); "$| Zr
return FALSE; M&KyA
} ]a?bzOr,
LRESULT res= CDialog::WindowProc(message, wParam, lParam); A_R!uRD8-
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ut_pHj@
AddIcon(); 8]bz(P#
return res; l+'F_a
} .TpsJXF
^:KO_{3E
void CCaptureDlg::AddIcon() Vn, ><g
{ @0NJ{
NOTIFYICONDATA data; 0 )}$^TV
data.cbSize=sizeof(NOTIFYICONDATA); Zb_apjg[4
CString tip; TTZe$>f
tip.LoadString(IDS_ICONTIP); O=}g4c
data.hIcon=GetIcon(0); |^a;77nE_^
data.hWnd=GetSafeHwnd(); eGL<vX
strcpy(data.szTip,tip); ^YlI>_3s
data.uCallbackMessage=IDM_SHELL; pHC/(6?
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !<<AzLVL
data.uID=98; Kct@87z
Shell_NotifyIcon(NIM_ADD,&data);
]Oeh=gq
ShowWindow(SW_HIDE); $_Nf-:D*
bTray=TRUE; fjG&`m#"
} =qu(~]2(
!*{q^IO9v&
void CCaptureDlg::DeleteIcon() B&0;4
{ ,Nm$i"Lg
NOTIFYICONDATA data; vFv3'b$;G
data.cbSize=sizeof(NOTIFYICONDATA); i=S~(gp
data.hWnd=GetSafeHwnd(); l\OLyQ
data.uID=98; F@YKFk+a
Shell_NotifyIcon(NIM_DELETE,&data); j;0vAf
ShowWindow(SW_SHOW); bHE2,;o
SetForegroundWindow(); Cu;5RSr2Z
ShowWindow(SW_SHOWNORMAL); :-T*gqj|
bTray=FALSE; E_T2z4lw
}
9+=gke
p@
NaD=9
void CCaptureDlg::OnChange() L%"LlSg
{ 2JGL;U$
RegisterHotkey(); TrS8h^C
} 3uWkc3
6%G-Vs]*2
BOOL CCaptureDlg::RegisterHotkey() p4!:]0c
{ Q\ppfc{,
UpdateData(); Z<?OwAWz
UCHAR mask=0; X}ma]
UCHAR key=0; fWnD\mx?0
if(m_bControl) }_9,w;M$
mask|=4; NPa\Cg[
if(m_bAlt) >$WQxbwM(
mask|=2; 2Os1C}m
if(m_bShift) "Jq8?FoT
mask|=1; V~G`kkNy
key=Key_Table[m_Key.GetCurSel()]; CNZ z]H
if(bRegistered){ m0n)dje
DeleteHotkey(GetSafeHwnd(),cKey,cMask); fxaJZz$o
bRegistered=FALSE; /P|fB]p
} w'MGA
cMask=mask; Mn1Pt|_@!
cKey=key; `.jzuX
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); YHkcWz
return bRegistered; U1_@F$mq<
} ^&@w$
Dl(3wgA
四、小结 4fk8*{Y
ajR%c2G;
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。