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:
# nhAW
r!uAofIi_ 一、实现方法
&|;!St]!M GTe9@d 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:
bV,R*C @/iLC6QF #pragma data_seg("shareddata")
ti%
e.p0[ HHOOK hHook =NULL; //钩子句柄
Uij$
eBN UINT nHookCount =0; //挂接的程序数目
K`<P^XJr static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
@jeV[N,0 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
o(qmI/h static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
"j>0A
Hem static int KeyCount =0;
s[bKGn@ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
S_6;e| #pragma data_seg()
_ji%BwJ 4v
.6_ebL 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。
4 XQ?By U7=Z.*/62 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:
_Pal)re]U y_#wR/E)u{ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
df\>-Hl cKey,UCHAR cMask)
9tQk/niMM5 {
Z%=E/xT BOOL bAdded=FALSE;
n]!H,Q1,T for(int index=0;index<MAX_KEY;index++){
~3 (>_r if(hCallWnd[index]==0){
ha5\T' hCallWnd[index]=hWnd;
5.
i;IOx HotKey[index]=cKey;
bc NYoZ8`
HotKeyMask[index]=cMask;
P&;I]2# bAdded=TRUE;
^Pwq`G A KeyCount++;
35T7g65; break;
7h~M&\M }
VPbNLi }
2XpGgG`2`C return bAdded;
*PPFk.#x }
1[ Pbsb //删除热键
bcf OpA BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]CYe=m1<2Q {
Y._AzJ&B[ BOOL bRemoved=FALSE;
70~]J8T+u for(int index=0;index<MAX_KEY;index++){
na)_8r~ if(hCallWnd[index]==hWnd){
<^paRKEa+# if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
{HeMdGn9 hCallWnd[index]=NULL;
kOO2 ?L|Z HotKey[index]=0;
"'L SLp HotKeyMask[index]=0;
2]wh1) bRemoved=TRUE;
]&>)=b!, KeyCount--;
#96a7K break;
;Wdo* ysW }
40XI\yE_? }
S;~_9i]upe }
F(r&:3!97 return bRemoved;
C&gJP7 UF }
Pc<ZfO # 9q?gmAn. }$ der DLL中的钩子函数如下:
7=9jXNk Y ]g :ZokU LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
"( xu {
s~CA
@ BOOL bProcessed=FALSE;
3L|k3 `I4 if(HC_ACTION==nCode)
*h1@eJHMz {
)U`
c9*. if((lParam&0xc0000000)==0xc0000000){// 有键松开
|u[gI+TUE switch(wParam)
-}s?!Pg> {
P^UcpU, case VK_MENU:
7w|s8B MaskBits&=~ALTBIT;
#<{MtK_ break;
p[Es4S}N case VK_CONTROL:
r|+Zni] MaskBits&=~CTRLBIT;
IkkrnG8 break;
H b.oKo$T case VK_SHIFT:
bmLNR MaskBits&=~SHIFTBIT;
[B
Al break;
u CXd%
CzE default: //judge the key and send message
:>=,sLfJ break;
NNX/2 }
53A=Ogk8S for(int index=0;index<MAX_KEY;index++){
(,>`\\ if(hCallWnd[index]==NULL)
bc-"If Z& continue;
_"n4SXhq if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|Cm}%sgR\0 {
4p]Y`];U SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
%{Gqhb=u\ bProcessed=TRUE;
5"+* c@L }
a%kj)ah }
S1."2AxO }
s*;~CH-[ else if((lParam&0xc000ffff)==1){ //有键按下
UOyP6ej switch(wParam)
U4gZW]F {
8wOr`ho B case VK_MENU:
]?2AFkF MaskBits|=ALTBIT;
XB?!V|bno break;
KE_Ze\P case VK_CONTROL:
pR$c<p MaskBits|=CTRLBIT;
\hz)oC break;
r*Mm5QozA case VK_SHIFT:
n(L {2r MaskBits|=SHIFTBIT;
Z(s}
#- break;
J0`?g6aY default: //judge the key and send message
1{*x+GC^/ break;
Cfi5r|S }
u[% #/ for(int index=0;index<MAX_KEY;index++){
j2z$kw% if(hCallWnd[index]==NULL)
Tb[GZ,/%; continue;
*m7e>]- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ZISR]xay {
; -3M SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
,AJd2i x bProcessed=TRUE;
aPbHrk*/ }
uo0(W3Q * }
r=vE0;7 }
2b<0g@~X if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
z}5XLa^ for(int index=0;index<MAX_KEY;index++){
\%K6T)9 if(hCallWnd[index]==NULL)
9X-DR continue;
eK`tFs,u if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
g$+3IVq& SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
KP
i@wl3 //lParam的意义可看MSDN中WM_KEYDOWN部分
,PB?pp8C} }
:=/DF }
4#o` -vcW }
ji1A>jepF return CallNextHookEx( hHook, nCode, wParam, lParam );
?lTQjw{ }
U|>Js!$ a P`;Nr= 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:
!U91 OSBE5 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
hk~s1" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
{*: C$"L )TxhJB5| 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:
tIg_cY_y 3TJNlS LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
^t| %!r
G {
cD 1p5U if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
$HaM,
Oh;i {
z\\MLyS //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
b_B4 SaveBmp();
L
U7. return FALSE;
(*p |Kzu }
hfY2pG9N …… //其它处理及默认处理
! _QU- }
@E}4LTB se?nx7~ _H-Lt{k 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。
:5dq<>~ ,Rf<6 /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。
7 `|- K (LnKaf8 二、编程步骤
\X(.%5xC $ (GXlhA 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";
1(-)$m8} 0s(G*D2%6 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
8garRB{ ~; MRQE 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;
lwV#j}G f>Ge
Em~ 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;
ec{pWzAe 5y.kOe4vH 5、 添加代码,编译运行程序。
|kjk{ Tfj%Sb,zM
三、程序代码
DlaA-i]l lK{h%2A\b ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
NpSS/rd $ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
[z/OY&kF #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
EayZ*e] #if _MSC_VER > 1000
.(! $j-B #pragma once
Ygg+*z
#endif // _MSC_VER > 1000
?(E$|A #ifndef __AFXWIN_H__
/:B!hvpw #error include 'stdafx.h' before including this file for PCH
5Ba eHzI #endif
SlmgFk!r! #include "resource.h" // main symbols
Z5v\[i@H! class CHookApp : public CWinApp
SoCa_9*X {
;XANITV public:
Nl0*"}`I_ CHookApp();
}e1f kjWk // Overrides
gVb;sk^ // ClassWizard generated virtual function overrides
P#iBwmwN+. //{{AFX_VIRTUAL(CHookApp)
yAaMYF@ public:
U1I2+;"#A virtual BOOL InitInstance();
mzDbw-# virtual int ExitInstance();
@<h@d_8^k //}}AFX_VIRTUAL
H>2)R7h //{{AFX_MSG(CHookApp)
\\6/" // NOTE - the ClassWizard will add and remove member functions here.
PKmr5FB // DO NOT EDIT what you see in these blocks of generated code !
mkgDg y //}}AFX_MSG
6?r}bs6Msx DECLARE_MESSAGE_MAP()
'};pu;GA7 };
Uh{|@D LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
@?TOg{: BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
{ymD.vf=9+ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
K;Fy&p^d BOOL InitHotkey();
L )kwMk BOOL UnInit();
T$!.
:v #endif
wgY:W:y'N ttgb"Wb%S //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
]e!9{\X,* #include "stdafx.h"
Y'0H2B8 #include "hook.h"
dxsPX=\: #include <windowsx.h>
|%Pd*yZA #ifdef _DEBUG
udgf{1EB&2 #define new DEBUG_NEW
"luMz;B #undef THIS_FILE
uvi+#4~G static char THIS_FILE[] = __FILE__;
,-D3tleu` #endif
NsPt1_Y8 #define MAX_KEY 100
n' &:c}zKO #define CTRLBIT 0x04
`-IX"rf #define ALTBIT 0x02
lx(kbSxF #define SHIFTBIT 0x01
:hC+r=!I #pragma data_seg("shareddata")
4+Wti!s HHOOK hHook =NULL;
-uX): h! UINT nHookCount =0;
}Dp/K4 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
|<gYzbq static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
741Sd8 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
*6<<6f`( static int KeyCount =0;
,Tjc\;~% static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
_ ZMoPEW #pragma data_seg()
Q3T@=z2j% HINSTANCE hins;
e-Mei7{% void VerifyWindow();
^-Bx zOp BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
C8ek{o)%W //{{AFX_MSG_MAP(CHookApp)
DgW*Br8< // NOTE - the ClassWizard will add and remove mapping macros here.
l]C#bL>i // DO NOT EDIT what you see in these blocks of generated code!
P 9c! //}}AFX_MSG_MAP
br`cxgZ0" END_MESSAGE_MAP()
~qT5F)$B- b"iPuN!p CHookApp::CHookApp()
;<hLy(@ {
<*oTVl4fS // TODO: add construction code here,
lk;4l Z // Place all significant initialization in InitInstance
m7!Mstu }
HHzAmHt 6fY-DqF! CHookApp theApp;
@Jr:+|v3B LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
MfNsor {
SJ8Ax_9{q BOOL bProcessed=FALSE;
+VT/c if(HC_ACTION==nCode)
C%H{" {
)B)ecJJ_ if((lParam&0xc0000000)==0xc0000000){// Key up
X;'H@GU0 switch(wParam)
db#svj* {
m) QV2n case VK_MENU:
#g=7fu{n: MaskBits&=~ALTBIT;
bf@H(gCW= break;
B63puX{u# case VK_CONTROL:
0 7b=Zhh MaskBits&=~CTRLBIT;
&PZ&'N|P break;
P.aN4 9`= case VK_SHIFT:
S\io5|P MaskBits&=~SHIFTBIT;
RqB 8g break;
4 ))Z Bq? default: //judge the key and send message
A*^aBWFR break;
/F@CrNFb( }
4 '"C8vw. for(int index=0;index<MAX_KEY;index++){
(P'{A>aHl0 if(hCallWnd[index]==NULL)
bY&!d. continue;
8n??/VDRl if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
X)Zc*9XA {
Nk2n&(~$ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
XCvL` bProcessed=TRUE;
_3%eIyk4T }
uHeKttR- }
SFJ"(ey$ }
lV".-:u_ else if((lParam&0xc000ffff)==1){ //Key down
q]Vxf!0*> switch(wParam)
_TntZv.? {
ANWfRtiU# case VK_MENU:
z>]P_E~`} MaskBits|=ALTBIT;
nEHmiG break;
y~Z7sx0 case VK_CONTROL:
ghU~H4[x D MaskBits|=CTRLBIT;
y7^E`LKK break;
{f"oqry_g case VK_SHIFT:
~)CGwST[ MaskBits|=SHIFTBIT;
qf
T71o( break;
WF] |-)vw default: //judge the key and send message
};Pdn7;1G: break;
g~p43sVV }
BD,J4xH; for(int index=0;index<MAX_KEY;index++)
g>E.Snj} {
k@Qd:I;; if(hCallWnd[index]==NULL)
&ea6YQ continue;
DrK@y8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
n{$! ]^> {
rHiBW! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
(h"-#q8$ bProcessed=TRUE;
PCx: }
HjCe/J ; }
eHb@qKnf }
twMDEw#VL if(!bProcessed){
u+
b `aB for(int index=0;index<MAX_KEY;index++){
T].Xx` if(hCallWnd[index]==NULL)
zb3,2D+P continue;
i"#pk"@` if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Yz)+UF, SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
4OeH}@ a }
v`hn9O }
[nA1WFfM }
%0Ibi return CallNextHookEx( hHook, nCode, wParam, lParam );
BEtFFi6ot }
@.)WS\Cv#E FQBE1h@k0u BOOL InitHotkey()
',Y`\X {
nc3usq if(hHook!=NULL){
8 qlQC.VA[ nHookCount++;
I= 2jQ>$Q return TRUE;
E(F?o.b }
`*WzHDv5p else
j-#h^3l1? hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
#(}'G* if(hHook!=NULL)
oP~%7Jt nHookCount++;
\NZ@>on return (hHook!=NULL);
$MqEM~^= }
6<fcG BOOL UnInit()
\1sWmN6 {
n"w>Y)C(X) if(nHookCount>1){
' ""s%C+ nHookCount--;
.B?fG)'WsF return TRUE;
cHC1l }
GXi)3I% BOOL unhooked = UnhookWindowsHookEx(hHook);
_MWW if(unhooked==TRUE){
W[f%m0 nHookCount=0;
)>tT""yEl hHook=NULL;
%/2OP &1< }
l?A~^4(5a/ return unhooked;
[]doLt;J }
s.^+y7$ &o]fBdn BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
cJ\1ndBH {
vRb7=fXf BOOL bAdded=FALSE;
lWDSF]ZYV for(int index=0;index<MAX_KEY;index++){
}Te+Rv7{E if(hCallWnd[index]==0){
'w0?- hCallWnd[index]=hWnd;
Rrrq>{D HotKey[index]=cKey;
_
h/:r1 HotKeyMask[index]=cMask;
xb2j
|KY7 bAdded=TRUE;
87F]a3 KeyCount++;
e=+q*]> break;
:w]NN\ }
v}\Fbe }
d ATAH}r& return bAdded;
[HhaBy9 }
u"Mf xW` #y'p4Xf BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
7^;-[?l
{
$9h^tP'CV BOOL bRemoved=FALSE;
Pv|sPIIB7 for(int index=0;index<MAX_KEY;index++){
ymn@1BA8J if(hCallWnd[index]==hWnd){
Yfx?3 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
&14xYpD< hCallWnd[index]=NULL;
HQSFl=Q HotKey[index]=0;
\*M;W|8aB HotKeyMask[index]=0;
O>>/2V9 bRemoved=TRUE;
!D!"ftOm KeyCount--;
mA#;6?6 break;
MP_/eC ; }
XZ2 ji_D }
w\M"9T }
fZ(k"*\MZ return bRemoved;
XP[~ :+ }
r?9".H 3e>U(ES void VerifyWindow()
e~SRGyIww {
r)B55;*Fh for(int i=0;i<MAX_KEY;i++){
G.r=fNP if(hCallWnd
!=NULL){ 411z-aS
if(!IsWindow(hCallWnd)){ ~R\ $Z
hCallWnd=NULL; MAp#1+k
HotKey=0; ..x2
HotKeyMask=0; P'<j<h6
KeyCount--; QRx9;!~b}
} 3vkzN
} a^Z=xlJ/uZ
} |n;5D,r0C
} C)~%(< D
+Ht(_+To1
BOOL CHookApp::InitInstance() _;R#B`9Iu
{ TrNh,5+b
AFX_MANAGE_STATE(AfxGetStaticModuleState()); a]J>2A@-I
hins=AfxGetInstanceHandle(); !}5+hj!6
InitHotkey(); Vh^ :.y
return CWinApp::InitInstance(); qoZe<jW (
} 2V~uPZ
m{&lU@uL
int CHookApp::ExitInstance() ~.#57g F"
{ _bRgr
VerifyWindow(); a5(9~.9
UnInit(); Z{gDEo)
return CWinApp::ExitInstance(); ]z2x`P^oI
} 2&=CC4<!d
%q.5;L
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |[p]])
o
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) A8k $.E
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ k@pEs# a
#if _MSC_VER > 1000 *q;83\
#pragma once WR u/7$8
#endif // _MSC_VER > 1000 D&=+PAX
X5(oL
class CCaptureDlg : public CDialog ><$V:nsEO
{ }S4+1
U3
// Construction %L$?Mey
public: 8w#4T:hsuN
BOOL bTray; 7#N
?{3i
BOOL bRegistered; "Xl"H/3r
BOOL RegisterHotkey(); rHqP[[4B'
UCHAR cKey; a@AIv"q
UCHAR cMask; ItVVI"-
void DeleteIcon(); p<&>1}j=
void AddIcon(); Y/LS(b*
UINT nCount; "Bz#5kqnl
void SaveBmp(); i~3\dp
CCaptureDlg(CWnd* pParent = NULL); // standard constructor brK7|&R<
// Dialog Data b&]z^_m)
//{{AFX_DATA(CCaptureDlg) GnCs_[*&r
enum { IDD = IDD_CAPTURE_DIALOG }; *^XMf
CComboBox m_Key; e.Jaq^Gw|
BOOL m_bControl; F=PBEaX
BOOL m_bAlt; QIdml*Np?H
BOOL m_bShift; %$bhg&}
CString m_Path; NBAOVYK
CString m_Number; zn0%%x+!g
//}}AFX_DATA oTr,zRL
// ClassWizard generated virtual function overrides e.Q'l/g
//{{AFX_VIRTUAL(CCaptureDlg) ;iQw2XhT
public: +Y2D @K?)
virtual BOOL PreTranslateMessage(MSG* pMsg); LoSrXK~0~J
protected: :f7:@8
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support sxdDI?W4
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); |QQ(1#d
//}}AFX_VIRTUAL `uqe[u;`6
// Implementation PG@C5Rnu
protected: 6BZi4:PDx
HICON m_hIcon; twt's,dO
// Generated message map functions zQ+
%^DT1
//{{AFX_MSG(CCaptureDlg) DYrci?8Ith
virtual BOOL OnInitDialog(); 2_Zn?#G8dl
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); vrh2}biCR
afx_msg void OnPaint(); Ci[Ja#p7$h
afx_msg HCURSOR OnQueryDragIcon(); dZddoz_
virtual void OnCancel(); ]
p v!Ll
afx_msg void OnAbout(); '#yIcV$
afx_msg void OnBrowse(); 9niffq)h
afx_msg void OnChange(); 'oM=ZU8wo
//}}AFX_MSG W@+ge]9m&
DECLARE_MESSAGE_MAP() BFqM6_/J
}; _UbyhBl
#endif V<U9Pj^?^
#UvWS
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 2ppJ;P{k
#include "stdafx.h" [vnxp/v/<
#include "Capture.h" K]^Jl0
#include "CaptureDlg.h" %wGQu;re
#include <windowsx.h> :#UA!|nV
#pragma comment(lib,"hook.lib") @# .a5
#ifdef _DEBUG `:dGPBBO
#define new DEBUG_NEW /<J5?H
#undef THIS_FILE {>Qs+]
static char THIS_FILE[] = __FILE__; R#ya9GN{
#endif LX(`@-<DH
#define IDM_SHELL WM_USER+1 y+7A?"s)
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hy3?.
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !F2JT@6
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; u~Y+YzCxV
class CAboutDlg : public CDialog Xa$tW%)
{ !3"Hn
public: `R-VJR 2"
CAboutDlg(); 461p 4)
// Dialog Data D&6.> wt
.
//{{AFX_DATA(CAboutDlg) R?:(~ X\
enum { IDD = IDD_ABOUTBOX }; T
0?9F2
//}}AFX_DATA 6h&i<->
// ClassWizard generated virtual function overrides %kk~qvW
//{{AFX_VIRTUAL(CAboutDlg) "@itn
protected: +4k4z:<n
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }G<A$*L1
//}}AFX_VIRTUAL @Z@S;RWSU
// Implementation ^!K 8nW{*
protected: 02po;
//{{AFX_MSG(CAboutDlg) FNXVd/{M3
//}}AFX_MSG T{Yk/Z/}?
DECLARE_MESSAGE_MAP() U5j0i]
}; 5pq9x4&
l
i2/"~l
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -raZ6?Zjc
{ :LD+B1$y
//{{AFX_DATA_INIT(CAboutDlg) liTAV9<
//}}AFX_DATA_INIT ?$4CgN-
} .Mzrj{^Y
iBqIV
void CAboutDlg::DoDataExchange(CDataExchange* pDX) *G,r:Bnb
{ &-ZRS/_d>
CDialog::DoDataExchange(pDX); {ALOs^_-
//{{AFX_DATA_MAP(CAboutDlg) @C5%`{\
//}}AFX_DATA_MAP 4,ewp coC%
} s;:quM
~VJP:Y{[
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) N{fYO4O
//{{AFX_MSG_MAP(CAboutDlg) &3Mps[u:h
// No message handlers &sS]h|2Z5
//}}AFX_MSG_MAP 2Zw]Uu`sb
END_MESSAGE_MAP() su Z`
/S%!{;:
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $I90KQB\_
: CDialog(CCaptureDlg::IDD, pParent) /Pa<I^-#
{ 90+Hv:wF
//{{AFX_DATA_INIT(CCaptureDlg) Jv:|J
DZ'
m_bControl = FALSE; t($z+C<
m_bAlt = FALSE; ^r~R]stE^
m_bShift = FALSE; v5`Odbc=w
m_Path = _T("c:\\"); 8?k.4{?
m_Number = _T("0 picture captured."); B4;P)\2
nCount=0; 5>M@
F0
bRegistered=FALSE; < nyk:E
bTray=FALSE; OY(znVHU
//}}AFX_DATA_INIT g?!;04
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Re'Ek
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); e
irRAU
} n/GJ&qLi:g
)hK1W\5
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) vX}mwK8
{ OTwXc*2u]
CDialog::DoDataExchange(pDX); |c!lZo/
//{{AFX_DATA_MAP(CCaptureDlg) 7.xJ:r|
DDX_Control(pDX, IDC_KEY, m_Key); eR5+1b
DDX_Check(pDX, IDC_CONTROL, m_bControl); M.}QXta
DDX_Check(pDX, IDC_ALT, m_bAlt); .(zZTyZr
DDX_Check(pDX, IDC_SHIFT, m_bShift); .@]M'S^1
DDX_Text(pDX, IDC_PATH, m_Path); ]mvVX31T
DDX_Text(pDX, IDC_NUMBER, m_Number); [0hZg
//}}AFX_DATA_MAP fT_swhIO
} cOEzS
*g/@-6
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) -q/FxESp
//{{AFX_MSG_MAP(CCaptureDlg) N_>}UhZ
ON_WM_SYSCOMMAND() &0S/]E`_M
ON_WM_PAINT() J*O$)K%Hx
ON_WM_QUERYDRAGICON() 8rsv8OO
ON_BN_CLICKED(ID_ABOUT, OnAbout) "Q<*H<e
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &g-uQBQI#
ON_BN_CLICKED(ID_CHANGE, OnChange) ]j?Kn$nv*S
//}}AFX_MSG_MAP
T89VSB~
END_MESSAGE_MAP() Li\BRlebR{
1_.#'U>
BOOL CCaptureDlg::OnInitDialog() MOW {g\{\
{ y7#4Mcc`~
CDialog::OnInitDialog(); \:wLUGFl5
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); \ g[A{
ASSERT(IDM_ABOUTBOX < 0xF000); 6WnGP>tc.
CMenu* pSysMenu = GetSystemMenu(FALSE); 7 }sj&
if (pSysMenu != NULL) '$n#~/#}
{ 7%4@*
CString strAboutMenu; H=k*;'
strAboutMenu.LoadString(IDS_ABOUTBOX); v;@-bED(Qs
if (!strAboutMenu.IsEmpty()) XS/5y(W
{ da&f0m U
pSysMenu->AppendMenu(MF_SEPARATOR); %S<( z5
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); g8_IZ(%:
} MhpR^VM'.
} tY=n("=2
SetIcon(m_hIcon, TRUE); // Set big icon 3M&75OE
SetIcon(m_hIcon, FALSE); // Set small icon L&nGjC+Lr
m_Key.SetCurSel(0); VCvqiHn
RegisterHotkey(); oWUDTio#[
CMenu* pMenu=GetSystemMenu(FALSE); {m%X\s;ni
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); I:aG(8Bi)H
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); QP e}rQnm
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %lU$;cY
return TRUE; // return TRUE unless you set the focus to a control
" V`MNZ
} q}["Nww-
ico(4KSk
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) cNG6 A4
{ X7]vXo*
if ((nID & 0xFFF0) == IDM_ABOUTBOX) []M+(8Z_P
{ uv[e0,@
CAboutDlg dlgAbout; 1dK^[;v>3
dlgAbout.DoModal(); VmB/X))
} 1v&!`^G99j
else ? I}T[j
{ z
{J1pH_X
CDialog::OnSysCommand(nID, lParam); a;Y9wn
} '4A8\&lQO
} 9D_4]'KG
KV0e^c;
void CCaptureDlg::OnPaint() \(LHcvbb
{ F#^ .L|d4
if (IsIconic()) ;D[b25
{ y*6r&989
CPaintDC dc(this); // device context for painting 4>^ %_Xj[
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QE5
85s5
// Center icon in client rectangle 2'J.$ h3
int cxIcon = GetSystemMetrics(SM_CXICON); gGU3e(!Uc
int cyIcon = GetSystemMetrics(SM_CYICON); kc8T@5+I0
CRect rect; *R>I%?]V3
GetClientRect(&rect); b`K~l'8
int x = (rect.Width() - cxIcon + 1) / 2; "FaG5X(
int y = (rect.Height() - cyIcon + 1) / 2; w|PZSOJ
// Draw the icon $/45*
dc.DrawIcon(x, y, m_hIcon); q#PGcCtu
} <S0!$.Kg*<
else b\?#O}
{ bah5 f
CDialog::OnPaint(); eeb8v:4
} a(8]y.`Tv
} 4!6g[[|&J
S-yd-MtQp
HCURSOR CCaptureDlg::OnQueryDragIcon() :"O=/p+*Us
{ U5H o? `<
return (HCURSOR) m_hIcon; O&w$
} ]&G5/]f
?ST}0F00}
void CCaptureDlg::OnCancel() Cq(Xa-
{ nM0nQ{6
if(bTray) VJR'B={h
DeleteIcon(); )uX:f8
CDialog::OnCancel(); o$-8V:)6d
} "!Qhk3*
;D^)^~7dh
void CCaptureDlg::OnAbout() ^c(PZ,/#JB
{ nO|S+S_9
CAboutDlg dlg; ;!~;05^iD
dlg.DoModal(); +p cj8K%
} %cm5Z^B1"
f^%E]ki
void CCaptureDlg::OnBrowse() %#]T.g
{ wl{p,[]
CString str; Zgg 7pL)#c
BROWSEINFO bi; l =_@<p
char name[MAX_PATH];
:,ym)|YV
ZeroMemory(&bi,sizeof(BROWSEINFO)); C`jP8"-
bi.hwndOwner=GetSafeHwnd(); R/Y/#X^b
bi.pszDisplayName=name; FI/YJ@21
bi.lpszTitle="Select folder"; .gPsJ?b
bi.ulFlags=BIF_RETURNONLYFSDIRS; 18n84RkI9
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6Ss{+MF|v
if(idl==NULL) }agl:~C
return; g-:)}8d6
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); asq/_`
str.ReleaseBuffer(); Hwc{%.% ae
m_Path=str; 52["+1g\
if(str.GetAt(str.GetLength()-1)!='\\') hL3,/^;E ,
m_Path+="\\"; 5{u6qc4FW
UpdateData(FALSE); G4{qWa/
} c0qv11,:t
kCwTv:)
void CCaptureDlg::SaveBmp() EIYM0vls(
{ U.)G#B
CDC dc; !}PFi T^
dc.CreateDC("DISPLAY",NULL,NULL,NULL); GY",AL8f
CBitmap bm; kIfb!
int Width=GetSystemMetrics(SM_CXSCREEN); \G= E%aK
int Height=GetSystemMetrics(SM_CYSCREEN); dI 5sqM:
bm.CreateCompatibleBitmap(&dc,Width,Height); 4bxkp3~h;
CDC tdc; 1 IlR
tdc.CreateCompatibleDC(&dc); O\LW
8\M
CBitmap*pOld=tdc.SelectObject(&bm); =k*0O_
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .3U[@ *b(
tdc.SelectObject(pOld); `HS4(2+C
BITMAP btm; "~(&5M\8`
bm.GetBitmap(&btm); <bx9;1C>zd
DWORD size=btm.bmWidthBytes*btm.bmHeight; !Q(xOc9>Ug
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }g*-Ty
BITMAPINFOHEADER bih; @*uX[)
bih.biBitCount=btm.bmBitsPixel; 9V],X=y~
bih.biClrImportant=0; J@GfO\
o
bih.biClrUsed=0; ) ]%9Tgn
bih.biCompression=0; Ds
G
*
bih.biHeight=btm.bmHeight; `Of wl%G
bih.biPlanes=1; >#:/
GN?
bih.biSize=sizeof(BITMAPINFOHEADER); NDOZ!`LqH
bih.biSizeImage=size; Uo @NK
bih.biWidth=btm.bmWidth; &V?q d{39
bih.biXPelsPerMeter=0; Ij#a
bih.biYPelsPerMeter=0; 1 :Yt2]
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !1RV[b.8
static int filecount=0; p\{+l;`
CString name; X]yERaJ,i
name.Format("pict%04d.bmp",filecount++); 87K)qsv8
name=m_Path+name; ]v{fFmL
BITMAPFILEHEADER bfh; NVjJ/
bfh.bfReserved1=bfh.bfReserved2=0; }m9LyT=~$
bfh.bfType=((WORD)('M'<< 8)|'B'); +r0eTP=zf
bfh.bfSize=54+size; 4{DeF@@
bfh.bfOffBits=54; F3Y>hs):7
CFile bf; Z0=m:h
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 7idi&h"
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [)3 U])w/
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); B
(1,Rq[
bf.WriteHuge(lpData,size); <]'"e]
bf.Close(); y^AA#kk
nCount++; '!-?
} fl"y@;;#h
GlobalFreePtr(lpData); 9 <KtI7
if(nCount==1) ~}5Ml_J$,l
m_Number.Format("%d picture captured.",nCount); MA+-2pMc|7
else r}\h\ {
m_Number.Format("%d pictures captured.",nCount); q~J
oGTv
UpdateData(FALSE); ,z1!~gIal
} uit-Q5@~
w`}9/s;$
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,0Zn hS)kq
{ 5FSv"=
if(pMsg -> message == WM_KEYDOWN) Z02s(y=k1
{ :Nz?<3R0\
if(pMsg -> wParam == VK_ESCAPE) <}
y p
return TRUE; AD@PNM
if(pMsg -> wParam == VK_RETURN) uXLZtfu{
return TRUE; b#g
{`E
} sJb)HQ,7x
return CDialog::PreTranslateMessage(pMsg); DvX3/z#T
} ^W"Q(sh
5Vi]~dZu7
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9>Uq$B
{ Ao":9r[V
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ hoR=%pC*
SaveBmp(); 5w3 ZUmjO
return FALSE; A*;?U2
} V-_/(xt*
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ kwHqvO!G
CMenu pop; NaA+/:
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); rQEi/
CMenu*pMenu=pop.GetSubMenu(0); YN@6}B#1
pMenu->SetDefaultItem(ID_EXITICON); zBt`L,^
CPoint pt; *AH^%!kVP
GetCursorPos(&pt); C.>
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); T|@#w%c''
if(id==ID_EXITICON) *q*HG W5
DeleteIcon(); sz/ *w 7
else if(id==ID_EXIT) #9`r XEz
OnCancel(); e3eVvl5]
return FALSE; 2vc\=
}
3@)obb
LRESULT res= CDialog::WindowProc(message, wParam, lParam); tqf&N0*
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) a*Ss -y
AddIcon(); )'5<6Q.]
return res; A XBkJ'jd
} !:"-:O}>=,
qO-C%p
[5
void CCaptureDlg::AddIcon() lwOf)jK:J
{ _BV`,`8}
NOTIFYICONDATA data; qL|
5-(P
data.cbSize=sizeof(NOTIFYICONDATA); c^=R8y-N
CString tip; 4\N_ G
@
tip.LoadString(IDS_ICONTIP); {l2N&
data.hIcon=GetIcon(0); gYatsFyL
data.hWnd=GetSafeHwnd(); fcRj
strcpy(data.szTip,tip); p9-0?(]
data.uCallbackMessage=IDM_SHELL; Di*]ab
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; z)lM2x>|*
data.uID=98; 4'SaEsA~
Shell_NotifyIcon(NIM_ADD,&data); o+<29o
ShowWindow(SW_HIDE); &%^K,Q"
bTray=TRUE; +z\\VD
} {A|bBg1!
*URdd,){i
void CCaptureDlg::DeleteIcon() BhKO_wQ?:J
{ naz:A
NOTIFYICONDATA data; 7*i}km
data.cbSize=sizeof(NOTIFYICONDATA); \a\= gn
data.hWnd=GetSafeHwnd(); {j?7d; 'j
data.uID=98; 8xgJSk
Shell_NotifyIcon(NIM_DELETE,&data); 9\v.qo.
ShowWindow(SW_SHOW); _J,xT
SetForegroundWindow(); "B#Y-
ShowWindow(SW_SHOWNORMAL); Z_FNIM0f
bTray=FALSE; 2"@Ft()]
} `(!NYx
`<^*jB@P
void CCaptureDlg::OnChange() #vQ?
{ {I{3 (M#"
RegisterHotkey(); wcZbmJ:
} -#aZF2z
Wr5 Q5s)c
BOOL CCaptureDlg::RegisterHotkey() ^agj4$
{ ExCM<$,
UpdateData(); -es"0wS<u
UCHAR mask=0; Uky9zGa
UCHAR key=0; @9 )}cg
if(m_bControl) d+6]u_J
mask|=4; BwxnDe G)
if(m_bAlt) CWi8Fv
mask|=2; W"Q!|#;l.
if(m_bShift) b`CWp;6Y
mask|=1; .:y5U}vR
key=Key_Table[m_Key.GetCurSel()];
6Y1J2n"
if(bRegistered){ (a.1M8v+Sg
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Oz{%k#X-
bRegistered=FALSE; A
WHU'
} 3qi_]*dD
cMask=mask; q8xd*--#
cKey=key; ]^K;goQv
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); /0lC KU!=
return bRegistered; 3b!,D
} [i7YVwG4
zizk7<?L.
四、小结 uS<_4A;sD,
Z\? E3j
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。