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:
]p:s5Q
o $7:*jU 一、实现方法
ifHQ2Ug9 #/=s74.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:
S|CN)8Jsi fzT|{vG8 #pragma data_seg("shareddata")
*I:^g HHOOK hHook =NULL; //钩子句柄
BGh1hyJ8d UINT nHookCount =0; //挂接的程序数目
\7n ;c static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
3WHj|ENW static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
x\z*iv static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
z/dpnGX static int KeyCount =0;
(P%{Tab static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
lyc
]E
9 #pragma data_seg()
[K1RP. Oi+9kk
e 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。
F=?0:2P0bD b=amd* 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:
4^/MDM@ jNd."[IrO BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
yr8
b?m.x cKey,UCHAR cMask)
&66-0d+Sh {
G6]W'Kk BOOL bAdded=FALSE;
pN|BtrN{ for(int index=0;index<MAX_KEY;index++){
X,DG2HT if(hCallWnd[index]==0){
7jPPN hCallWnd[index]=hWnd;
f*)8bZDD HotKey[index]=cKey;
>rJ9^rS HotKeyMask[index]=cMask;
mwU|Hh)N] bAdded=TRUE;
!6{; z/Hy KeyCount++;
5 YjqN break;
%#kml{I }
%Bn"/0, }
(1Q G]1q return bAdded;
Osz:23(p }
$o2 H#" //删除热键
6AD#x7drj BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
X`
r~cc {
P_6JweN BOOL bRemoved=FALSE;
fhp\of/@
R for(int index=0;index<MAX_KEY;index++){
cih[A2lp if(hCallWnd[index]==hWnd){
Q"rQVO if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
PWUS@I hCallWnd[index]=NULL;
zmaf@T HotKey[index]=0;
}ADdKK- HotKeyMask[index]=0;
.nh }f}j bRemoved=TRUE;
36iDiT_ KeyCount--;
>d2U=Yk! break;
hq+j8w}<- }
Esx"nex }
^k{b8-)W< }
c"F3[mrff return bRemoved;
'&v.h#< }
m/TjXA8_ e x"E50 m
ioNMDG DLL中的钩子函数如下:
rnX
D( LkvR]^u0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
&/wd_;d^A {
Dfz3\|LJ BOOL bProcessed=FALSE;
0G?*i_u\ if(HC_ACTION==nCode)
5jMI33D {
JO3"$s|t if((lParam&0xc0000000)==0xc0000000){// 有键松开
N(ov.l; switch(wParam)
[9N>*dKB {
!C]2:+z-MF case VK_MENU:
!g|)?XWc MaskBits&=~ALTBIT;
}[2 break;
X0\O3l*j case VK_CONTROL:
LKC^Y)6o MaskBits&=~CTRLBIT;
$?`-} wY break;
}KFf case VK_SHIFT:
'tyblj C MaskBits&=~SHIFTBIT;
d-k`DJ! break;
)DG>omCY default: //judge the key and send message
naOCa break;
4gKu8G }
WK$d<:" for(int index=0;index<MAX_KEY;index++){
g+v.rmX if(hCallWnd[index]==NULL)
$F&m('aB8
continue;
kxvzAKz~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
4 q-/R {
yzI`&?
P2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
bn*SLWWQ.3 bProcessed=TRUE;
d-%bRGo/ }
#LU<v }
WlJ=X$ }
"2m (*+ else if((lParam&0xc000ffff)==1){ //有键按下
,ICn]Pdz@ switch(wParam)
2?c##Izn {
]:"<if gp$ case VK_MENU:
LZR
x>q^ MaskBits|=ALTBIT;
fGtYvl O-5 break;
&AUtUp
kOo case VK_CONTROL:
M0) q MaskBits|=CTRLBIT;
&d,!^9 break;
h;C/} s case VK_SHIFT:
Z.QgL= MaskBits|=SHIFTBIT;
r3;@ break;
oeKVcVP|'& default: //judge the key and send message
mZG)#gW[ break;
qp##>c31X }
7oWT6Qa5 for(int index=0;index<MAX_KEY;index++){
8GN_3pT if(hCallWnd[index]==NULL)
lq'MLg continue;
(8Ptuh6\\2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\-`,fat {
mG\$W#+j SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Py72:;wn bProcessed=TRUE;
VvFMpPi }
ahoXQ8c:\} }
D,hZVKa }
v}`{OE:-J if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Z~S%|{&Br for(int index=0;index<MAX_KEY;index++){
:@~W$f\y if(hCallWnd[index]==NULL)
kN~:Bh$ continue;
d}:eLC if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
.D8|_B SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-Z(='A //lParam的意义可看MSDN中WM_KEYDOWN部分
1SK|4Am }
:HiAjaA1pg }
rWMG6+Scb }
% S vfY { return CallNextHookEx( hHook, nCode, wParam, lParam );
uyqu n@q }
gJFx#s0?6. zBjtPtiiI8 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:
fHV%.25 nDU=B.?E{O BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
p[^a4E_v BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Ip_deP@ ]I^b&N 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:
OaH1xZNOC` ?:AD&Dn LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
qG)M8xk {
+x(~!33[G if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Y#<>N-X|kA {
A||,|He~ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
7TU(~]Z SaveBmp();
S*3*Q l* return FALSE;
&l8eljg }
)W,.xP …… //其它处理及默认处理
[:BD9V }
cF V[k'F +Y!
P VMF WcHL:38 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。
y>! 8mDvZ Rp0`%}2
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。
ascY E ,j!%,!n o 二、编程步骤
2{}8_G 5._1G| 3 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";
x O_u uvMcB9 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
ZJf:a}=h AW<"3 !@ 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;
ZBuh(be [k<.BCE 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;
P _x(`H DD fw&
y 5、 添加代码,编译运行程序。
;.U<Lr^9# {A`J0ol<B9 三、程序代码
$<da<}b "$krK7Z ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
)&{<gyS1 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
,_M #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
HD_ #-M #if _MSC_VER > 1000
: *8t,f~s^ #pragma once
Y/<`C #endif // _MSC_VER > 1000
(Go1@;5I #ifndef __AFXWIN_H__
l.Q.G<ol #error include 'stdafx.h' before including this file for PCH
8= "01 #endif
S
Rb-eDk' #include "resource.h" // main symbols
,^1B"#0{C< class CHookApp : public CWinApp
M .oH,Kd6 {
d=C&b] public:
5"9'=LV~ CHookApp();
KXf(v4 // Overrides
N8KH.P+ // ClassWizard generated virtual function overrides
-{z<+(K!$ //{{AFX_VIRTUAL(CHookApp)
92(P~Sdv public:
hX)PdRk# virtual BOOL InitInstance();
^xX1G_{ virtual int ExitInstance();
6o)RsxN eu //}}AFX_VIRTUAL
)#l&BV5 //{{AFX_MSG(CHookApp)
)]tf|Mbu // NOTE - the ClassWizard will add and remove member functions here.
S;^'Ek"Z. // DO NOT EDIT what you see in these blocks of generated code !
lj /IN[U/ //}}AFX_MSG
QAzwNXE+ DECLARE_MESSAGE_MAP()
POI|#[-V };
q:MSV{k LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
]4onY> BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
v\2-% BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
hS'!JAM>Q BOOL InitHotkey();
pEp$J;
BOOL UnInit();
/hSEm.< #endif
*X /i< G{74o8 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
7 MS-Gs| #include "stdafx.h"
|,Kk#`lW<f #include "hook.h"
:MihVL F #include <windowsx.h>
3gv@JGt7` #ifdef _DEBUG
tx7B?/5D #define new DEBUG_NEW
:/R>0 n, #undef THIS_FILE
t{-*@8Ke static char THIS_FILE[] = __FILE__;
: G'a"%x #endif
l:+$K s #define MAX_KEY 100
<Rfx`mn #define CTRLBIT 0x04
8?N![D\@ #define ALTBIT 0x02
* hmoi #define SHIFTBIT 0x01
K=1prv2 #pragma data_seg("shareddata")
\0n<6^y HHOOK hHook =NULL;
&Jd_@F#J UINT nHookCount =0;
dUL*~%2I static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
BA8g[TA7K static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
3b?8<* static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
ye-[l7 static int KeyCount =0;
#T=e p0 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
`96MXP #pragma data_seg()
Dkg^B@5Xr HINSTANCE hins;
M%Zh{ void VerifyWindow();
VG_xNM BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
}5AA}= //{{AFX_MSG_MAP(CHookApp)
NG8F'=< // NOTE - the ClassWizard will add and remove mapping macros here.
L{0\M`B- // DO NOT EDIT what you see in these blocks of generated code!
/@64xrvIl= //}}AFX_MSG_MAP
VwKfM MI8 END_MESSAGE_MAP()
MZ?+I~@ TVF:z_M9 CHookApp::CHookApp()
hmB`+?,z* {
@<3kj
R?j // TODO: add construction code here,
}wZsM[NDB // Place all significant initialization in InitInstance
:JU$6 }
ojyP.R d&lT/S CHookApp theApp;
Z*n4$?%W LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
-/:!AxIH {
\]0#jI/: BOOL bProcessed=FALSE;
C;?<WtH if(HC_ACTION==nCode)
WmOu#5*; {
GX=U6n> if((lParam&0xc0000000)==0xc0000000){// Key up
pVM1%n:# switch(wParam)
*v$j n {
?pWda<& case VK_MENU:
N/eus"O; MaskBits&=~ALTBIT;
i|rC Ga0} break;
\D1@UyE case VK_CONTROL:
DzIV5FG MaskBits&=~CTRLBIT;
1)3'Y2N* break;
\5-Dp9vG case VK_SHIFT:
E`Br# "/Bl MaskBits&=~SHIFTBIT;
U|<>xe*|% break;
}`aT=_ B default: //judge the key and send message
LLL;SNY break;
Zrzv'; }
?<rZ9$ for(int index=0;index<MAX_KEY;index++){
T$sm}= if(hCallWnd[index]==NULL)
a ?\:,5= continue;
H43d[@h if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Z<*"sFpAO {
hW9U%-D SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
SkmKf~v bProcessed=TRUE;
Z_a@,k:+[ }
>S8
n8U }
b 4f3ef }
bYmk5fpRG else if((lParam&0xc000ffff)==1){ //Key down
&fsk ESV0 switch(wParam)
wD/jN: {
Dw>)\\n{Kl case VK_MENU:
QQ=Kj%R MaskBits|=ALTBIT;
>[&ser break;
d)0|Q case VK_CONTROL:
)%<,JD MaskBits|=CTRLBIT;
^%m{yf# break;
f&txg,W,yv case VK_SHIFT:
x |gYxZ MaskBits|=SHIFTBIT;
%{Obhj;c break;
3.9/mztS default: //judge the key and send message
~Kl"V%> break;
~pHuh#> }
h/2@4XKj for(int index=0;index<MAX_KEY;index++)
%<r}V<OeR {
<m0=bm{j if(hCallWnd[index]==NULL)
O0s,)8+z5D continue;
W*?qOq
{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
3dJiu {
Z;[xaP\S SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
,L
MN@G bProcessed=TRUE;
49HP2E }
qL
<@PC.5 }
i3pOGa< }
\6bvk _ if(!bProcessed){
}|&^Sg%95 for(int index=0;index<MAX_KEY;index++){
^*+j7A.n if(hCallWnd[index]==NULL)
EPA
2_ continue;
^/cqE[V~, if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
s IBP$9 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
n]7rHV}G }
`[e0_g\ }
=$%-RX7 }
2jlz#Sk return CallNextHookEx( hHook, nCode, wParam, lParam );
;$8ptB . }
-d thY(8 h6bvUI+|h BOOL InitHotkey()
I!}V+gu= {
eC WF0a if(hHook!=NULL){
x iz+R9p nHookCount++;
pju*i6z return TRUE;
6pt|Crvu }
R+!oPWfb else
Y;iI=U hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
]
_W'-B if(hHook!=NULL)
B.KK@ nHookCount++;
4>2\{0r return (hHook!=NULL);
O9m sPb: }
<WnIJum BOOL UnInit()
#DARZh U) {
um%s9 if(nHookCount>1){
'+ mI
nHookCount--;
&ld<fa(w+2 return TRUE;
:5'hd^Q }
yE.st9m BOOL unhooked = UnhookWindowsHookEx(hHook);
nf[KD,f if(unhooked==TRUE){
gI9nxy nHookCount=0;
8k)*f+1o hHook=NULL;
2
E?]!9T~| }
Y]Z& return unhooked;
2Nx:Y+[
}
9P,[MZ _zzT[} BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
6`%|-o
: {
G(wstHT;/ BOOL bAdded=FALSE;
2Dt^W.! for(int index=0;index<MAX_KEY;index++){
T!Tp:&O- if(hCallWnd[index]==0){
(/Jy9=~ hCallWnd[index]=hWnd;
t=My=pG HotKey[index]=cKey;
V|F/ynJfA HotKeyMask[index]=cMask;
s&+`> bAdded=TRUE;
q(WGvl^r KeyCount++;
Lsai8 B break;
.gNziDO
}
Ut C<TBr }
\So)g)K return bAdded;
P[$idRS& }
}'86hnW Z\]LG4N? BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
v~W;&{ {
he@Y1CY BOOL bRemoved=FALSE;
wAgVevE for(int index=0;index<MAX_KEY;index++){
tk:nth if(hCallWnd[index]==hWnd){
j^v<rCzc( if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
]Nw]po+ hCallWnd[index]=NULL;
m5a'Vs HotKey[index]=0;
B*E"yB\NV HotKeyMask[index]=0;
>|gXE> bRemoved=TRUE;
8r:T&)v KeyCount--;
smn(q)tt break;
2yD ?f8P4 }
DZLEx{cm }
8|$g"?CU }
9~2iA,xs return bRemoved;
@HnahD }
J5O/c,?g $P)-o?eer void VerifyWindow()
pHye8v4fvi {
C-@M|K9A' for(int i=0;i<MAX_KEY;i++){
@[`]w`9Q7 if(hCallWnd
!=NULL){ XbeT x
if(!IsWindow(hCallWnd)){ k]P'D
.
hCallWnd=NULL; #c"05/=A
HotKey=0; pIug$Ke_%
HotKeyMask=0; H;@0L}Nu+}
KeyCount--; gNZ"Kr o6
} aIr"!. 4
} Sn
7h$
} 1{RA\CF
} %KN2iNq
<g\:By^
BOOL CHookApp::InitInstance() aqI m W
{ :;hm^m]Y
AFX_MANAGE_STATE(AfxGetStaticModuleState()); +W$uHQq
hins=AfxGetInstanceHandle(); -UAMHd}4
InitHotkey(); <Wj/A/
return CWinApp::InitInstance(); TEGg)\+D>
} Im};wJ&
\}<J>R@
int CHookApp::ExitInstance() bE=[P}E
{
Jk:ZO|'Z
VerifyWindow(); ()$m9%x
UnInit(); &B1!,joH~
return CWinApp::ExitInstance(); SOMAs'=
} ,%zE>^~
3h%Nd&_9
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file /QCg E~
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) aI}htb{m`
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ FPZ@6
#if _MSC_VER > 1000 @at*E%T[
#pragma once uINEq{yo
#endif // _MSC_VER > 1000 7Up-a^k^`
iAPGP-<6
class CCaptureDlg : public CDialog |%rRALIY
{ u*oP:!s
// Construction EG_P^<z
public: KV'3\`v@LY
BOOL bTray; (9'q/qgTO
BOOL bRegistered; ZEpu5`
BOOL RegisterHotkey(); >* F#ZZv}p
UCHAR cKey; \l# H#~
UCHAR cMask; bP|-GCKM8
void DeleteIcon(); \<y|[
void AddIcon(); -]YsiE?r
UINT nCount; pe).
void SaveBmp(); _j{)%%?r
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 1Mx2%
// Dialog Data . S;o#Zw*R
//{{AFX_DATA(CCaptureDlg) t: ,lz8Y~
enum { IDD = IDD_CAPTURE_DIALOG }; ADP3Nic
CComboBox m_Key; <]#_&Na
BOOL m_bControl; W'E3_dj+
BOOL m_bAlt; BvH I}=
BOOL m_bShift; -- IewW
CString m_Path; CPY|rV
CString m_Number; W>,D$
//}}AFX_DATA 2$2@?]|?
// ClassWizard generated virtual function overrides xa
!/.
//{{AFX_VIRTUAL(CCaptureDlg) B[f:T%
public: 9\E];~"iP
virtual BOOL PreTranslateMessage(MSG* pMsg); *$JS}Pax
protected: :;LaV
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !>+m46A
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); p^p1{%=
//}}AFX_VIRTUAL ]C|xo.=?]
// Implementation I8IH\5k
protected: =BV_?
HICON m_hIcon; 0&Iu+hv
// Generated message map functions ~X'hRNFx~
//{{AFX_MSG(CCaptureDlg) X*bOE}
virtual BOOL OnInitDialog(); i\4d d)p-
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !HW?/-\,O
afx_msg void OnPaint();
!NKPy+v
afx_msg HCURSOR OnQueryDragIcon(); w2`JFxQ^x
virtual void OnCancel(); 62[_u]<Yub
afx_msg void OnAbout(); |uRYejj#j
afx_msg void OnBrowse(); G!Y7RjWD
afx_msg void OnChange(); O\@0o|NM
//}}AFX_MSG b=L|GV@$
DECLARE_MESSAGE_MAP() 9):^[Wkx
}; }Py Z{yS
#endif
[Z1,~(3
Cs,t:ajP
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ,ob)6P^rw
#include "stdafx.h" Q%V530
P;
#include "Capture.h" m8gU8a"(
#include "CaptureDlg.h" O"RIY3m
#include <windowsx.h> 0nR_I^
#pragma comment(lib,"hook.lib") hsI9{j]f
#ifdef _DEBUG 8lCo\T5"
#define new DEBUG_NEW vv`53 Pbw)
#undef THIS_FILE ;jlI>;C;V
static char THIS_FILE[] = __FILE__; 2e({%P@2?
#endif aLQ]2m
#define IDM_SHELL WM_USER+1 sE^=]N
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3YEw7GIO-
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); y99|V39'
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; t-]~^s
class CAboutDlg : public CDialog xp\6,Jyh
{ h<!!r
public: !\\1#:*_W
CAboutDlg(); 3Z%jx#
// Dialog Data WxtB:7J
//{{AFX_DATA(CAboutDlg) RTL@WI
enum { IDD = IDD_ABOUTBOX }; WtMDHfwqu\
//}}AFX_DATA d#I; e
// ClassWizard generated virtual function overrides 8Urj;KkD
//{{AFX_VIRTUAL(CAboutDlg) S;nlC
protected: o4aFgal1
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >kDkv g1"
//}}AFX_VIRTUAL ;4`%?6%
// Implementation sB'~=1m^
protected: d! _8+~
//{{AFX_MSG(CAboutDlg) r+h$]OJ
//}}AFX_MSG dQNW1-s
DECLARE_MESSAGE_MAP() 1%N[DA^<\
}; ^VjF W
V?jot<|$
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) O[9A} g2~
{ <VT|R~
//{{AFX_DATA_INIT(CAboutDlg) j3/K;U/SGJ
//}}AFX_DATA_INIT ]"\sd"
} Cs^'g'
v%E!
void CAboutDlg::DoDataExchange(CDataExchange* pDX) aR%E"P-6l
{ @ |(Tg
CDialog::DoDataExchange(pDX); MQo/R,F }
//{{AFX_DATA_MAP(CAboutDlg) ]%h|ox0
//}}AFX_DATA_MAP LJ*W&y(2>Q
} uCf _O~
qu/b:P
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1@^*tffL:
//{{AFX_MSG_MAP(CAboutDlg) a0&R! E;
// No message handlers b5^-qc6X
//}}AFX_MSG_MAP cN]g^
END_MESSAGE_MAP() iE"+-z\U
)Tf,G[z&ge
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7KV0g1GQ
: CDialog(CCaptureDlg::IDD, pParent) VyOpPIP
{ 6"GHVFB
//{{AFX_DATA_INIT(CCaptureDlg) tI+P&L"
m_bControl = FALSE; I@I-QiI
m_bAlt = FALSE; -1]8f
m_bShift = FALSE; U#(#U0s*-
m_Path = _T("c:\\"); %I%OHs
m_Number = _T("0 picture captured."); \7*"M y*
nCount=0; $HFimU,V=0
bRegistered=FALSE; 0JV|wd8j
bTray=FALSE; ,4S6F HK
//}}AFX_DATA_INIT OZ Hfd7K4A
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +^|=MK%
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Iv>4o~t
} u 9kh@0
JS(%:
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) DG
6W
^
{ }(w9[(K
CDialog::DoDataExchange(pDX); rL6Y4u0e%
//{{AFX_DATA_MAP(CCaptureDlg) MtBoX*"
DDX_Control(pDX, IDC_KEY, m_Key); RJ$x{$r[
DDX_Check(pDX, IDC_CONTROL, m_bControl); U^9#uK6GM
DDX_Check(pDX, IDC_ALT, m_bAlt); 3TNj*jo
DDX_Check(pDX, IDC_SHIFT, m_bShift); #Dl=K<I
DDX_Text(pDX, IDC_PATH, m_Path); '/<f'R^
DDX_Text(pDX, IDC_NUMBER, m_Number); s.>;(RiJd
//}}AFX_DATA_MAP =_vW7-H
} M}N[> ,2'
::p(ViYG
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ,h* 'Cs04h
//{{AFX_MSG_MAP(CCaptureDlg) ^wb$wtL('
ON_WM_SYSCOMMAND() w72\'
ON_WM_PAINT() k\}\>&Zqu
ON_WM_QUERYDRAGICON() n4DKLAl
ON_BN_CLICKED(ID_ABOUT, OnAbout) ITBa ^P
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) .=/TT|eMS
ON_BN_CLICKED(ID_CHANGE, OnChange) >VB*Xt\C&
//}}AFX_MSG_MAP !2]'S=Y
END_MESSAGE_MAP() n~?n+\.&a
&>3AL,
BOOL CCaptureDlg::OnInitDialog() Og9:MFI
{ *T0!q#R
CDialog::OnInitDialog(); 3KN})*1
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); nb #)$l
ASSERT(IDM_ABOUTBOX < 0xF000); KDJ-IXoU
CMenu* pSysMenu = GetSystemMenu(FALSE); fH?s~X]
if (pSysMenu != NULL) [?moS!
{ Kb*X2#;*
CString strAboutMenu; A%%Vyz
strAboutMenu.LoadString(IDS_ABOUTBOX); ac#I$V-
if (!strAboutMenu.IsEmpty()) VK^m]??s_
{ ?m:,hI
pSysMenu->AppendMenu(MF_SEPARATOR); 75*q^ui
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); # 4;(^`?
} 9=p/'d8
} 0z`-fQfK
SetIcon(m_hIcon, TRUE); // Set big icon ^(T_rEp
SetIcon(m_hIcon, FALSE); // Set small icon ;;7:l,vy
m_Key.SetCurSel(0); d\j[O9W>
RegisterHotkey(); Tu_4kUCR!f
CMenu* pMenu=GetSystemMenu(FALSE); )LjW=;(b
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); xA]}/*
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); O
<"\G!y~
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); E}8wnrxf
return TRUE; // return TRUE unless you set the focus to a control {9<c*0l
} +L|-W9"@3
%p8#pt\$7
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) w)xfP^M#
{ i
3i
if ((nID & 0xFFF0) == IDM_ABOUTBOX) noQS bI
@
{ 4ZrRgx2MD
CAboutDlg dlgAbout; P,={ C6*
dlgAbout.DoModal(); ja+PVf
} fW3NH7aUG
else >A ?,[p`<
{ )^LiALh
CDialog::OnSysCommand(nID, lParam); zT ; +akq
} ]T1\gv1~
} )5/,B-+O"
UA(&_-C\
void CCaptureDlg::OnPaint()
)6:1`&6
{ Gq0`VHAn
if (IsIconic()) ]@hN&W(+ x
{ aP/Ff%5T
CPaintDC dc(this); // device context for painting rqz`F\A;%
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); n1;zml:7_
// Center icon in client rectangle ) S,f I
int cxIcon = GetSystemMetrics(SM_CXICON);
u E<1PgW
int cyIcon = GetSystemMetrics(SM_CYICON); ,<!v!~Iy
CRect rect; Vl%UT@D|
GetClientRect(&rect); (u-eL#@
int x = (rect.Width() - cxIcon + 1) / 2; Ktn:6=,
int y = (rect.Height() - cyIcon + 1) / 2; #-8%g{
// Draw the icon pra0:oHN
dc.DrawIcon(x, y, m_hIcon); o&:'MwU
} {Xv0=P
else w>TTu:
7
{ /SD(g@G,
CDialog::OnPaint(); ]jgMN7
} 9oTtH7%
} 7)dCdO
b;IzK'
HCURSOR CCaptureDlg::OnQueryDragIcon() J)._&O$
{ 0Q!/A5z
return (HCURSOR) m_hIcon; yGvBQ2kYb
} x|GkXD3
nUf0TkA
void CCaptureDlg::OnCancel() |wGmu&fY
{ EClx+tz;`
if(bTray) \x<i6&.
DeleteIcon(); T*jQzcm~?
CDialog::OnCancel(); 6}>CPi#
} i>%A0.9
(DY&{vudF
void CCaptureDlg::OnAbout() ]\(Ho
{ \IO<V9^L
CAboutDlg dlg; DAf0bh"
dlg.DoModal(); e&-MP;kgW9
} Fuy"JmeR
$nr=4'yZ
void CCaptureDlg::OnBrowse() vC!B}~RG
{ ^5rB/y,
CString str; _t?#
BROWSEINFO bi; r2T$
;m.
char name[MAX_PATH]; vq:?a
ZeroMemory(&bi,sizeof(BROWSEINFO)); 0^K2"De
bi.hwndOwner=GetSafeHwnd(); a[@Y>
bi.pszDisplayName=name; rk
&ME#<r
bi.lpszTitle="Select folder"; @wcrtf~{)&
bi.ulFlags=BIF_RETURNONLYFSDIRS; .,<w_=
LPITEMIDLIST idl=SHBrowseForFolder(&bi); q0 L\{
if(idl==NULL) *>E_lWW.
return; cyBm,!
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ToM1#]4
str.ReleaseBuffer(); g9@H4y6fe=
m_Path=str; pch8A0JAl)
if(str.GetAt(str.GetLength()-1)!='\\') xq&r|el
m_Path+="\\"; 1 RVs!;
UpdateData(FALSE); d'@i8N["{
} 00/ RBs5
Q$b4\n?44
void CCaptureDlg::SaveBmp() $V,ZH*
g
{ m,V"S(A
CDC dc; Q%x-BZb~
dc.CreateDC("DISPLAY",NULL,NULL,NULL); `PZcL2~E
CBitmap bm; X8y :=k,E
int Width=GetSystemMetrics(SM_CXSCREEN); m2[]`Ir^@
int Height=GetSystemMetrics(SM_CYSCREEN);
*JF7 B
bm.CreateCompatibleBitmap(&dc,Width,Height); \1<8'at
CDC tdc; ~(\.j=x
tdc.CreateCompatibleDC(&dc); B["jndyr
CBitmap*pOld=tdc.SelectObject(&bm); ca<OG;R^
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); DdqE6qE
tdc.SelectObject(pOld); xM=?ES
BITMAP btm; Jk;dtLL}4
bm.GetBitmap(&btm); QXEz[R
DWORD size=btm.bmWidthBytes*btm.bmHeight; Y 2[ik<
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); HT7I~]W
BITMAPINFOHEADER bih; -f["1-A
bih.biBitCount=btm.bmBitsPixel; )zkr[;j~`
bih.biClrImportant=0; r-o+NV
bih.biClrUsed=0; @cc}[Uw4B
bih.biCompression=0; lJdrrR)wg
bih.biHeight=btm.bmHeight; ai"N;1/1O|
bih.biPlanes=1; q\xsXM
bih.biSize=sizeof(BITMAPINFOHEADER); Zs2;VW4RW
bih.biSizeImage=size; ]z8Th5a?o
bih.biWidth=btm.bmWidth; '&/~Sh$%
bih.biXPelsPerMeter=0; |_ OoD9,M
bih.biYPelsPerMeter=0; %LBf'iA
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); }kSP p
static int filecount=0; ndu$N$7+
CString name; b8**M'k
name.Format("pict%04d.bmp",filecount++); %E[ $np>
name=m_Path+name; 8ib e#jlg
BITMAPFILEHEADER bfh; o)+C4f[G4
bfh.bfReserved1=bfh.bfReserved2=0; AnoA5H
bfh.bfType=((WORD)('M'<< 8)|'B'); |h& q
bfh.bfSize=54+size; mFt\xGa
bfh.bfOffBits=54; mYbu1542'n
CFile bf; VFq7nV/O
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ IV~5Y{(l
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); XZrzG P(
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); V/tl-;W
bf.WriteHuge(lpData,size); ki|OowP
bf.Close(); vI]V@il
nCount++; =R*IOJ
} p-*{x
GlobalFreePtr(lpData); =^z*p9ZB
if(nCount==1) [9yd29pQ]
m_Number.Format("%d picture captured.",nCount); 9Zr6 KA{
else ?}HZJ@:lB
m_Number.Format("%d pictures captured.",nCount); G"ixw
UpdateData(FALSE); #'.
' |z
} I#;.;%u
3gYtu-1
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) <?h(Dchq
{ 1n[wk'}qf4
if(pMsg -> message == WM_KEYDOWN) a:s$[+'Y
{ @6*eS+t\
if(pMsg -> wParam == VK_ESCAPE) 3zv0Nwb,
return TRUE; *;T'=u_lR
if(pMsg -> wParam == VK_RETURN) &5*t*tI
return TRUE; *Ag3qnY
} uK0L>
return CDialog::PreTranslateMessage(pMsg); qp{~OW3
} N'0nt]&a
\H
5t-w=
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8 %p+:6kP5
{ ),H1z`c&I
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ E:;MI{;7
SaveBmp(); ~MP/[,j`
return FALSE; EqOhz II^
} loUZD=Ph
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ *VaQ\]:d
CMenu pop; +_jM$?:F}
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); bI8')a
CMenu*pMenu=pop.GetSubMenu(0); ^4xl4nbx
pMenu->SetDefaultItem(ID_EXITICON); U+aiH U9
CPoint pt; &{q<
GetCursorPos(&pt); t"OP*
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); $ago
if(id==ID_EXITICON) fKO@Qx]
DeleteIcon(); KN&|&51p}
else if(id==ID_EXIT) 5Rp mR
OnCancel(); bK{ VjXF
return FALSE; &'Xgf!x
} ?v`24p3PC
LRESULT res= CDialog::WindowProc(message, wParam, lParam); JW"`i
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) C3~O6<,Jh
AddIcon(); &UO/p/a
return res; 93=?^
} V."cmtf
v=cX.^L
void CCaptureDlg::AddIcon() ~du U& \
{ g ;XK3R
NOTIFYICONDATA data; GyVuQ51
data.cbSize=sizeof(NOTIFYICONDATA); g?*D)WU
CString tip; TP/bX&bjCy
tip.LoadString(IDS_ICONTIP); %'VzN3Q5V
data.hIcon=GetIcon(0); J&B5Ll
data.hWnd=GetSafeHwnd(); I9xkqj
strcpy(data.szTip,tip); PEaZ3{-
data.uCallbackMessage=IDM_SHELL; lq a~ZF*
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yqR]9"a
data.uID=98; mQ9shdvt-
Shell_NotifyIcon(NIM_ADD,&data); 'T7Y5X80$j
ShowWindow(SW_HIDE); UID`3X
bTray=TRUE; wk'&n^_br
} d.
ZfK
L-zU%`1{M
void CCaptureDlg::DeleteIcon() 7Sh1QDYZ
{ tKds|0,j|
NOTIFYICONDATA data; '&$zgK9T?
data.cbSize=sizeof(NOTIFYICONDATA); X&Sah}0V&
data.hWnd=GetSafeHwnd(); 4vNH"72P
data.uID=98; wFjQ1<s=
Shell_NotifyIcon(NIM_DELETE,&data); gSf> +|
ShowWindow(SW_SHOW); ^z~drcR
SetForegroundWindow(); /2MZH
ShowWindow(SW_SHOWNORMAL); 8~T=p:z'
bTray=FALSE; tY:,9eh7B
} _xBhMu2f
Aj(y]p8
void CCaptureDlg::OnChange() LBmXy8'T`
{ fPstSez
RegisterHotkey(); hjhZ":I.
} t_Rj1U
?{xD{f$
BOOL CCaptureDlg::RegisterHotkey() cob??|,\m
{ Vv+ oq5hf
UpdateData(); =#A/d`2
b
UCHAR mask=0; `b%^_@Fb
UCHAR key=0; D *IeG>%
if(m_bControl) L+eK)Q
mask|=4; @ZrNV*&<
if(m_bAlt) Hs{x Z:
mask|=2; tu/4
if(m_bShift) ,?`kYPZ
mask|=1; ly6dl
key=Key_Table[m_Key.GetCurSel()]; "-j96
KD
if(bRegistered){ x(p/9$.#
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2|U6dLZ!
bRegistered=FALSE; 3+q-yP#X
} A,(9|#%L
cMask=mask; r;E5e]w*-
cKey=key; 3,#v0 #
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Ndyo)11z
return bRegistered; E`{DX9^
} Mm1>g~o
s6#e?5J
四、小结 K@/dQV%Z
)-Z*/uF^
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。