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:
l\
dPfJ
SlB`ktcfI 一、实现方法
P WS8Dpb liYsUmjZ= 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:
Vw w 211 Kq")|9=d #pragma data_seg("shareddata")
sP^:*B0 HHOOK hHook =NULL; //钩子句柄
Jy:*GW6 UINT nHookCount =0; //挂接的程序数目
%6(\Ki6I static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
=k<b* 8 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
O;4S<N static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
R^`}DlHX static int KeyCount =0;
#"6l+} static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
:i>LESJq #pragma data_seg()
#tZ!D^GQHq 6%p6BK6 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。
CL2zZk{u_ ?x",VA 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:
BywEoS G h+;Vrx BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
?M4ig_ cKey,UCHAR cMask)
UZt3Ua&J {
&c-V
QP( BOOL bAdded=FALSE;
vVtkB$]L for(int index=0;index<MAX_KEY;index++){
CX/[L)|Ru if(hCallWnd[index]==0){
mIf)=RW hCallWnd[index]=hWnd;
BsXF'x<U* HotKey[index]=cKey;
P4"BX*x HotKeyMask[index]=cMask;
ij]~n bAdded=TRUE;
9HR1m3 KeyCount++;
b [HnhAI break;
HAE$Np|>a }
0>j0L8#^p }
ds(X[7XGW
return bAdded;
LiHJm- }
Uot(3p!S6 //删除热键
\68bXY. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
_lI(!tj( {
8Q/cJ+& BOOL bRemoved=FALSE;
4?@5JpC9VA for(int index=0;index<MAX_KEY;index++){
$o+@}B0) if(hCallWnd[index]==hWnd){
^4WZ%J#g if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
A?HDY_u hCallWnd[index]=NULL;
ksU& q%1 HotKey[index]=0;
9u=]D> kb HotKeyMask[index]=0;
JT}"CuC bRemoved=TRUE;
O~8jz KeyCount--;
Wp
=
]YO break;
Z5rL.a& }
^'N!k{x }
|7|'JTy }
rk=w~IZJ3 return bRemoved;
OkQ<
Sc }
b/.EA'/ TQt[he$O d^?e*USh DLL中的钩子函数如下:
|oeg'T UBv#z&@[ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
H '5zl^8I {
-"yma_ BOOL bProcessed=FALSE;
/tkV/ if(HC_ACTION==nCode)
Dp*:oMATx0 {
@QJPcF" if((lParam&0xc0000000)==0xc0000000){// 有键松开
68~]_r.a switch(wParam)
0@'-g^PS {
0p3) t case VK_MENU:
X..M!3W MaskBits&=~ALTBIT;
)sIzBC break;
{nZP4jze case VK_CONTROL:
zwUZ*Se MaskBits&=~CTRLBIT;
4%v-)HGh break;
P<1&kUZL case VK_SHIFT:
4Vj]bm MaskBits&=~SHIFTBIT;
NB3+kf , break;
\K2S.j default: //judge the key and send message
'yOx&~H] break;
#( 4)ps. }
N["M "s(N for(int index=0;index<MAX_KEY;index++){
J|V*g]#kP if(hCallWnd[index]==NULL)
:ldI1*@i< continue;
`aMnTF5: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
h _c11# {
j*VYUM@y1\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
IL&R&8' bProcessed=TRUE;
=AK6^v&on }
}e"2Nc_UG }
qi_uob }
(F R else if((lParam&0xc000ffff)==1){ //有键按下
K#v @bu:' switch(wParam)
sN[<{;K4 {
LD|T1. case VK_MENU:
*bcemH8f MaskBits|=ALTBIT;
[A uA< break;
X|TGM case VK_CONTROL:
SX?hu|g_r MaskBits|=CTRLBIT;
`sdbo](76 break;
U z)G Y case VK_SHIFT:
0rDQJCm MaskBits|=SHIFTBIT;
<aMihT)dd break;
's8LrO(= default: //judge the key and send message
d8jP@> break;
j}%C;;MPH }
c@O7,y:`I for(int index=0;index<MAX_KEY;index++){
g{?{N if(hCallWnd[index]==NULL)
!q+
%]k?x continue;
Em<J{`k6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>tkU+$;- {
a,t]> z95 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
t(^Lh.<a bProcessed=TRUE;
7BgA+Fz }
QUdF`_U7 }
u"q!p5P%q }
Qz A)HDQ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
AdF[>Wv for(int index=0;index<MAX_KEY;index++){
TY#pj if(hCallWnd[index]==NULL)
qy!pD
R; continue;
)Vy}oFT\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
6:bvq?5a5 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
xtS0D^ //lParam的意义可看MSDN中WM_KEYDOWN部分
nza^<DlS }
SP|Dz,o }
V+y:!t` }
}?d
l.=eq return CallNextHookEx( hHook, nCode, wParam, lParam );
1z8AK"8 }
0j-;4>p 4mWT"T-8 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
q'[yYPDX5x K@=_&A! BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
-QydUr/(o BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
5~omZ,qe J$Ba*`~!! 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:
<Y#EiC. WB|SXto%4D LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
WkY>--^ {
0V#eC if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
@|o^]-, {
'"Dgov$q //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
dLu3C-.( SaveBmp();
6EX8,4c\ return FALSE;
|)R{(AK- }
DO=zxdTI! …… //其它处理及默认处理
qg-?Z,EB }
Xn8r3Nb$A y$pT5X G Ll6|Wh X 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
G0$,H(]~ !*|`-woE 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。
!TuMrA* `Df)wNN1 二、编程步骤
~%:23mIk DadlCEZv 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";
ZTSNM)f \c$!C8z 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
8|p*T&Cn& a?9Ka!O4s 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
>&N8Du*[ M&O .7B1} 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
w6l8RNRe -J*jW
N! 5、 添加代码,编译运行程序。
VFwp .1oa! 6tmn1: 三、程序代码
z+B"RV <P1sK/IZb ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
i;B)@op.# #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
wp8ocZ-Gj #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
hGvuA9d~ #if _MSC_VER > 1000
}M9L,O*^ #pragma once
:<Y, f(c #endif // _MSC_VER > 1000
w873: = #ifndef __AFXWIN_H__
9y"*H2$# #error include 'stdafx.h' before including this file for PCH
7w{>bYP #endif
PYz^9Ud 6g #include "resource.h" // main symbols
ra k@oW] class CHookApp : public CWinApp
qS|t7* {
sIh,@b public:
+V6N/{^5 CHookApp();
%t^-Guz // Overrides
$u./%JS // ClassWizard generated virtual function overrides
]\<^rEU //{{AFX_VIRTUAL(CHookApp)
,0=:06l public:
@dCoh-Q3 virtual BOOL InitInstance();
@'EU\Y\l virtual int ExitInstance();
n +z5;'my //}}AFX_VIRTUAL
vrD]o1F //{{AFX_MSG(CHookApp)
$fA%_T_P'P // NOTE - the ClassWizard will add and remove member functions here.
bO%bMZWB!y // DO NOT EDIT what you see in these blocks of generated code !
Rc H",*U //}}AFX_MSG
N&t+*kF_ DECLARE_MESSAGE_MAP()
A/EW57v" };
%g4G&My@J LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
>;.'$- BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
(r?41?5K BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
LHb(T`.= BOOL InitHotkey();
R1X{=ct BOOL UnInit();
F+!K9( `| #endif
,9W|$2=F +," /z\QO //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
=FXZcP>h #include "stdafx.h"
@<O
Bt d #include "hook.h"
u<l[S #include <windowsx.h>
Wo@0yF@ #ifdef _DEBUG
o'Byuct #define new DEBUG_NEW
UmSy p\i #undef THIS_FILE
K$dSg1t
static char THIS_FILE[] = __FILE__;
g9`z]qGWS: #endif
4~3 N;]X #define MAX_KEY 100
lXS.,#lp #define CTRLBIT 0x04
T8,?\7)S9 #define ALTBIT 0x02
!giL~}j(R #define SHIFTBIT 0x01
y pv~F #pragma data_seg("shareddata")
OFTyN^([@ HHOOK hHook =NULL;
}Zue?!KQ UINT nHookCount =0;
I|*w?i* static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
emo@&6* static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
}0Qex=vkO static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Wi
Mi0?$. static int KeyCount =0;
p#UrZKR static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
_>8ZL)NQQ #pragma data_seg()
W4Ey]y" HINSTANCE hins;
wtCz%!OYB void VerifyWindow();
P"LbWZ6Nj BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
%># VhK //{{AFX_MSG_MAP(CHookApp)
%(IkUD // NOTE - the ClassWizard will add and remove mapping macros here.
9"3 7va // DO NOT EDIT what you see in these blocks of generated code!
%o4ZD7@ ' //}}AFX_MSG_MAP
Pwn3/+"%K END_MESSAGE_MAP()
l.c*,9
|gW>D=rkj CHookApp::CHookApp()
FabzP_<b {
mX9amS&B$ // TODO: add construction code here,
dMw0Aw,2]8 // Place all significant initialization in InitInstance
]kQ*t{\ }
+,&8U&~` 0yhC_mI CHookApp theApp;
N|OI~boV% LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
$
\j/s:Y {
\YE(E04w57 BOOL bProcessed=FALSE;
B 3Y,|* if(HC_ACTION==nCode)
?32gug\i'} {
iX]Vkx if((lParam&0xc0000000)==0xc0000000){// Key up
A~_*vcz switch(wParam)
"&s9;_9 {
nCZ&FNi{O~ case VK_MENU:
5G"DgG*< MaskBits&=~ALTBIT;
u:Fa1 !4JR break;
X!,2/WT case VK_CONTROL:
roDE?7x1 MaskBits&=~CTRLBIT;
0drt,k break;
AM4lAq_ case VK_SHIFT:
18ApHp MaskBits&=~SHIFTBIT;
h\#\hx break;
Y[l*>}:w default: //judge the key and send message
WdEVT,jjh break;
038|>l-9[ }
:C*7DS for(int index=0;index<MAX_KEY;index++){
fk5xIW if(hCallWnd[index]==NULL)
W_:3Sj l' continue;
+{(f@,&~{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
A
dNQS {
f3Zm_zxj SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
"]1 !<M6\i bProcessed=TRUE;
*E*=
;BG }
\$.8iTr@ }
V2As 5 }
fhGI else if((lParam&0xc000ffff)==1){ //Key down
Wt|IKCx switch(wParam)
By&T59 {
'MLp*3djF, case VK_MENU:
Y.XNA]| MaskBits|=ALTBIT;
n7g}u break;
Hd*e9;z case VK_CONTROL:
5G$N MaskBits|=CTRLBIT;
(X=JT break;
5f;6BP case VK_SHIFT:
z l?Gd4 MaskBits|=SHIFTBIT;
hk6(y?# break;
!&'GWQY{( default: //judge the key and send message
w; [ndZCY7 break;
zSy^vM;6zf }
V
iY -&q' for(int index=0;index<MAX_KEY;index++)
1b^e4 {
rC`pTN if(hCallWnd[index]==NULL)
CD}::7$ continue;
6_Ps*Ed if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
GM_~2Er] {
+rAmy SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
-;NGS
)RM bProcessed=TRUE;
t6/w({}j }
bTBV:]w }
H7{)"P]{f }
>6Y@8 ) if(!bProcessed){
,z4)A&F[c; for(int index=0;index<MAX_KEY;index++){
~quof> if(hCallWnd[index]==NULL)
'q3<R%^Q continue;
_C`&(?} if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
z$64Ep# SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
+D7>$&BD }
x*H,eY3 }
* {avx }
8
5 L< return CallNextHookEx( hHook, nCode, wParam, lParam );
GkwdBy+ }
/!7 bsuGZ BOOL InitHotkey()
%y96]e1 {
e}f#dR+( if(hHook!=NULL){
voX4A
pl nHookCount++;
O0Z!*Hy return TRUE;
^/6LVB * }
1zNh&
" else
vIq>QXb;d hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
'80mhrEutG if(hHook!=NULL)
wh Hp}r nHookCount++;
%#go9H(K return (hHook!=NULL);
_HMQx_e0YM }
k)j6rU BOOL UnInit()
+56N}MAs {
-!@]z2uU if(nHookCount>1){
p!oO}gE nHookCount--;
0P_=Oy"l- return TRUE;
/penB[1i }
NL^;C3u BOOL unhooked = UnhookWindowsHookEx(hHook);
1U)U {i7j if(unhooked==TRUE){
h(~@
nd{ nHookCount=0;
wH?]kV8Q hHook=NULL;
aB_~Vh }
2ezk<R5q+ return unhooked;
CMhl* dH }
8}M-b6RV MnLo{G] BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*x!j:/S`n {
B~ ?R 6 BOOL bAdded=FALSE;
h5)4Z^n for(int index=0;index<MAX_KEY;index++){
a!@(bb
z> if(hCallWnd[index]==0){
|
)No4fm hCallWnd[index]=hWnd;
=I.uf HotKey[index]=cKey;
=67ab_V HotKeyMask[index]=cMask;
&0*7]Wo* bAdded=TRUE;
]D.}
/g KeyCount++;
m~I@q
[ break;
q!10G }
/wi*OZ7R }
dz6&TdEl return bAdded;
W{$J)iQ }
iFOa9!_0n awU!3)B BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
WJlJD*3 {
7_9^nDU BOOL bRemoved=FALSE;
r@t
\a+
for(int index=0;index<MAX_KEY;index++){
>rhqhmh;W" if(hCallWnd[index]==hWnd){
' Ig:- if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$x/VO\Z{- hCallWnd[index]=NULL;
A3Xfu$[u HotKey[index]=0;
<B
Vx% HotKeyMask[index]=0;
:R'={0Jg bRemoved=TRUE;
2^X<n{0N) KeyCount--;
j'uzjs[ break;
]\1H=g%Ou }
l NLa:j }
og?L 9 }
*b4W+E return bRemoved;
Z!+n/ D-1 }
5_\1f|, 1rIL[(r4 void VerifyWindow()
GU0[K#% {
w-"tA`F4 for(int i=0;i<MAX_KEY;i++){
F05]6NVv if(hCallWnd
!=NULL){ 6Z@?W
if(!IsWindow(hCallWnd)){ l3Qt_I)L
hCallWnd=NULL; V. e30u5
HotKey=0; m0i,Zw{eM
HotKeyMask=0; N0pA ,&
KeyCount--; ;S9
z@`a.
} XZ=%XB:?
} M?00n< vM
} I]z4}#+cX
} hg7_ZjO
oe*fgk/o9
BOOL CHookApp::InitInstance() >~l^E!<i-u
{ |;(>q
AFX_MANAGE_STATE(AfxGetStaticModuleState()); gXj3=N(l
hins=AfxGetInstanceHandle(); j.yh>"de
InitHotkey();
/s~BE ,su
return CWinApp::InitInstance(); 6/.kL;AI
} 0}`0!Kv
WR9-HPF
int CHookApp::ExitInstance() }vb.>hy
{ z%;_h-
VerifyWindow(); lMmP]{.>$
UnInit(); 7/HX!y{WP
return CWinApp::ExitInstance(); v]'\]U^
} uovSe4q5q
*m8{yh
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file E#E&z (G2
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^U6VJ(58P
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ gg.lajX
#if _MSC_VER > 1000 U]&/F{3
im
#pragma once K1=j7
#endif // _MSC_VER > 1000 kpRk.Q*
)43z(:<
class CCaptureDlg : public CDialog b
w!
{ J^=Xy(3e
// Construction ;v!Ef"E|cV
public: gDjAnz#
BOOL bTray; $Ji;zR4,
BOOL bRegistered; ,*sKr)9)
BOOL RegisterHotkey(); b"2_EnE}1
UCHAR cKey; Jim5Ul
UCHAR cMask; \('WS[$2
void DeleteIcon(); Qoa&]]
void AddIcon(); Uuktq)NU
UINT nCount; 3fUiYI|&7
void SaveBmp(); H~?7:K
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ezA&cZ5
// Dialog Data ,b<m],p
//{{AFX_DATA(CCaptureDlg) mYqLqezAA
enum { IDD = IDD_CAPTURE_DIALOG }; A>frf[fAW
CComboBox m_Key; yb-4[C:i
BOOL m_bControl; @zJiR{Je-U
BOOL m_bAlt; wn.UjxX.
BOOL m_bShift; \"X_zM
CString m_Path; @ %o'
CString m_Number; !Ld[`d.|R!
//}}AFX_DATA },;Z<(
// ClassWizard generated virtual function overrides or"9I1o
//{{AFX_VIRTUAL(CCaptureDlg) u
p]>UX8
public: /A-VT
virtual BOOL PreTranslateMessage(MSG* pMsg); NOFH
protected: Q]]M;(
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /GF"D5
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); I0N~>SpZ5
//}}AFX_VIRTUAL iGBHlw;A
// Implementation CropHB/t
protected: ^[6#Kw&E
HICON m_hIcon; (ylZ[M&B:
// Generated message map functions iM$iZ;Tp
//{{AFX_MSG(CCaptureDlg) +fHqGZ]
virtual BOOL OnInitDialog(); 4YXp,U
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); mln%Rd6u/
afx_msg void OnPaint(); 8g?2( MT;
afx_msg HCURSOR OnQueryDragIcon(); Y}h&dAr
virtual void OnCancel(); 39x
4(
afx_msg void OnAbout(); %6x3G
afx_msg void OnBrowse(); Knp}88DR^j
afx_msg void OnChange(); 59(kk;
//}}AFX_MSG J&L#^f*d
DECLARE_MESSAGE_MAP() 55Xfu/hQ
}; Xif>ZL?aXb
#endif #dFE}!"#`
yQq|!'MK k
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file qykI[4
#include "stdafx.h" >ktekO:H
#include "Capture.h" 6ZQ$5PY
#include "CaptureDlg.h" D 77$aCt
#include <windowsx.h> P)[QC
#pragma comment(lib,"hook.lib") WHr:M/qD
#ifdef _DEBUG N_p^DP
#define new DEBUG_NEW 8\bZ?n#dn
#undef THIS_FILE N.vkM`Z
static char THIS_FILE[] = __FILE__; A{wk$`vH
#endif >+%p}l:<\
#define IDM_SHELL WM_USER+1 WV;[v g]
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sUZ2A1J}
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); XUK%O8N#9
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; XcKyrh;i
class CAboutDlg : public CDialog G{.A5{
{ d 1 O+qS
public: :eBp`dmn
CAboutDlg(); \wp8kSzC
// Dialog Data } 7i}dyQv}
//{{AFX_DATA(CAboutDlg) k~]\kv=
enum { IDD = IDD_ABOUTBOX }; w69G6G(
//}}AFX_DATA sh%%U
// ClassWizard generated virtual function overrides "R[6Q ^vw
//{{AFX_VIRTUAL(CAboutDlg) -];Hb'M.!e
protected: h:
zi8;(
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (`d _DQ
//}}AFX_VIRTUAL ah!fQLMH
// Implementation /4 .]L~
protected: 9$^v*!<z\
//{{AFX_MSG(CAboutDlg) KA."[dVa
//}}AFX_MSG +}C M2>M
DECLARE_MESSAGE_MAP() R/&C}6Gn
}; }S9uh-j6l
h=_h,?_
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) _2eL3xXha.
{ *B+YG^Yu^
//{{AFX_DATA_INIT(CAboutDlg) X'5+)dj
//}}AFX_DATA_INIT u2 U4MV1C
} {'Gu@l
;{rl
Y>
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >H?~2O
{ tmC9p6%
CDialog::DoDataExchange(pDX); &uJ7[m19z
//{{AFX_DATA_MAP(CAboutDlg) S4%MnT6Uy
//}}AFX_DATA_MAP )Ju$PrO
} e0<L^|S
^j'vM\^`ml
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ntF#x.1Pm
//{{AFX_MSG_MAP(CAboutDlg) "HbrYYRb'
// No message handlers Y0nuwX*{
//}}AFX_MSG_MAP SFa^$w
END_MESSAGE_MAP() jqy?Od)
N-GQ\&
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) RH<C:!F^
: CDialog(CCaptureDlg::IDD, pParent) nb|"dK|
{ hN_,Vyf
//{{AFX_DATA_INIT(CCaptureDlg) D 3}e{J8
m_bControl = FALSE; wq3 V&@.
m_bAlt = FALSE; 0'Qo eFKG
m_bShift = FALSE; 2
Xc,c*r
m_Path = _T("c:\\"); i{2rQy+
m_Number = _T("0 picture captured."); ++0xa%:
nCount=0; l7GLN1#m
bRegistered=FALSE; ^i~'aq
bTray=FALSE; 1H,hw
//}}AFX_DATA_INIT P
C
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 2n5{H fpY
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); :6Sb3w5h
} a<{+
JU5
kx3]A"]>'
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) f%Bm x{Ttq
{ Hy1f,D
CDialog::DoDataExchange(pDX); ACxjY2
//{{AFX_DATA_MAP(CCaptureDlg)
QX393v!
DDX_Control(pDX, IDC_KEY, m_Key); |h%fi-a:
DDX_Check(pDX, IDC_CONTROL, m_bControl); ZBfB4<M9xS
DDX_Check(pDX, IDC_ALT, m_bAlt); zXg/.z]
DDX_Check(pDX, IDC_SHIFT, m_bShift); qbdv
DDX_Text(pDX, IDC_PATH, m_Path); UkBr4{+aE
DDX_Text(pDX, IDC_NUMBER, m_Number); ;hp?wb
//}}AFX_DATA_MAP ppM^&6x^
} ?28aEX_w
4S#q06=Xe
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !Pb39[f
//{{AFX_MSG_MAP(CCaptureDlg) 'D;'Pr]
ON_WM_SYSCOMMAND() dKTUW<C
ON_WM_PAINT() p uLQ_MNV
ON_WM_QUERYDRAGICON() as| MB
(
ON_BN_CLICKED(ID_ABOUT, OnAbout) eEkbD"Q
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) RJZ4fl
ON_BN_CLICKED(ID_CHANGE, OnChange) %O3 r>o=
//}}AFX_MSG_MAP D*#r
V
P
END_MESSAGE_MAP() kT6EHuB
})}-K7v1+
BOOL CCaptureDlg::OnInitDialog() WD5ulm?91|
{ T Jp0^&Q
CDialog::OnInitDialog(); :j0r~*z-
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (s.S
n(E
ASSERT(IDM_ABOUTBOX < 0xF000); ur2`.dY>3"
CMenu* pSysMenu = GetSystemMenu(FALSE); p![CH
if (pSysMenu != NULL) Y+I`XeY
{ e#$ZOK)`
CString strAboutMenu; L1E\^)
strAboutMenu.LoadString(IDS_ABOUTBOX); s"\o6r
,
if (!strAboutMenu.IsEmpty()) S}cm.,/w
{ o\YF_235
pSysMenu->AppendMenu(MF_SEPARATOR); nANoy6z:
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); gRdg3qvU
} 675x/0}GO
} FucLcq2Z
SetIcon(m_hIcon, TRUE); // Set big icon Ju7nvxC
SetIcon(m_hIcon, FALSE); // Set small icon ?#917M
m_Key.SetCurSel(0); ;1 02ddRV
RegisterHotkey(); (PN!k0Y
CMenu* pMenu=GetSystemMenu(FALSE); `Z0#IeX=
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,HdFE|
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); URD<KIN>
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -3T6ck
return TRUE; // return TRUE unless you set the focus to a control sx0:g?F3j
} ,fwN_+5
?pv}~>
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) DHV#PLbN$
{ T9+ ?A
l
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
$dLPvN
{ >_$DKY>$`
CAboutDlg dlgAbout; nn_j"Nu
dlgAbout.DoModal(); #ab=]}2W_g
} Mb(aI!;A
else N5=;
PZub
{ -3<5,Q{G+
CDialog::OnSysCommand(nID, lParam); {^#62Y
} x1kb]0s<-
} DN@T4!
$Y4;Xe=
void CCaptureDlg::OnPaint() )5j%."
{ mSzBNvci
if (IsIconic()) f9g#pyH4
{ ` `A=p<W
CPaintDC dc(this); // device context for painting +`x8[A)-
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Osdw\NNH~M
// Center icon in client rectangle ?b~V uo
int cxIcon = GetSystemMetrics(SM_CXICON); j9za)G-J
int cyIcon = GetSystemMetrics(SM_CYICON); Xo*=iD$Jys
CRect rect; 1v4(
GetClientRect(&rect); e/m,PE
int x = (rect.Width() - cxIcon + 1) / 2; DT@6Q.
int y = (rect.Height() - cyIcon + 1) / 2; \@4_l?M
// Draw the icon 5"5D(
dc.DrawIcon(x, y, m_hIcon); ( {H5k''
} Rt<8&.m4
else t "J"G@1)
{ zZ|Si
CDialog::OnPaint(); 1;[\xqJ
} o~F @1
} q@p-)+D;
!\H!9FR
HCURSOR CCaptureDlg::OnQueryDragIcon() y.~y*c6,g
{ d\dt}&S 5
return (HCURSOR) m_hIcon; Eq9TJt'3y
}
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bO:Ei
void CCaptureDlg::OnCancel() 78\:{i->ta
{ (@dh"=Lt\
if(bTray) vvLm9Tw
DeleteIcon(); "|<\\HR
CDialog::OnCancel(); _gB`;zo
} lu(<(t,Lbs
V,($I'&/
void CCaptureDlg::OnAbout() 92GO.xAD?
{ ho_;;y
CAboutDlg dlg; !c\d(u
dlg.DoModal(); 9
I> 3p4]
} RV|: mI
s!09Pxc
void CCaptureDlg::OnBrowse() pAYH"Q6~)I
{ E{d Mdz
CString str; oQ 5g0(J~
BROWSEINFO bi; iZQwo3"8r
char name[MAX_PATH]; ](vshgp2
ZeroMemory(&bi,sizeof(BROWSEINFO)); Z
xLjh
bi.hwndOwner=GetSafeHwnd(); l,*v/95h
bi.pszDisplayName=name; =/"Of
bi.lpszTitle="Select folder"; Pn5@7~
bi.ulFlags=BIF_RETURNONLYFSDIRS; lC+p2OG^[
LPITEMIDLIST idl=SHBrowseForFolder(&bi); tgDmHxB]0
if(idl==NULL) 9/RbfV[)
return; SM5i3EcFYP
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); UcDJ%vI
str.ReleaseBuffer(); [K[tL|EK
m_Path=str; _`L,}=um'
if(str.GetAt(str.GetLength()-1)!='\\') 4em7PmT
m_Path+="\\"; bv>;%TF
UpdateData(FALSE); Ix%h/=I
} LKG],1n-
FK{YRt
void CCaptureDlg::SaveBmp() ~!'%m(g
{ #H(|+WEu
CDC dc; )]!Ps` ,u
dc.CreateDC("DISPLAY",NULL,NULL,NULL); rB}UFS)
CBitmap bm; [syuoJ
int Width=GetSystemMetrics(SM_CXSCREEN); 0b=OK0n!%
int Height=GetSystemMetrics(SM_CYSCREEN); 3Qe:d_
bm.CreateCompatibleBitmap(&dc,Width,Height); V#|#%
8
CDC tdc; R)t"`'6|
tdc.CreateCompatibleDC(&dc); @?{n`K7{`
CBitmap*pOld=tdc.SelectObject(&bm); Pv`yOx&nE
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5B
.+>u"e
tdc.SelectObject(pOld); 'Ol}nmJ'n
BITMAP btm; S)z
jfJR
bm.GetBitmap(&btm); ,:QG%Et
DWORD size=btm.bmWidthBytes*btm.bmHeight; !'B.ad
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); b/ 'fC%o,
BITMAPINFOHEADER bih; ^v3ytS
bih.biBitCount=btm.bmBitsPixel; <dDGV>n4;
bih.biClrImportant=0; bc5+}&W
bih.biClrUsed=0; ?};}#%971
bih.biCompression=0; BXaA#} ;e
bih.biHeight=btm.bmHeight; '@wYr|s4
bih.biPlanes=1; X_|8CD-@6
bih.biSize=sizeof(BITMAPINFOHEADER); |v}"UW(y
bih.biSizeImage=size; O$Wt\Y<q
bih.biWidth=btm.bmWidth; 4>{q("r,
bih.biXPelsPerMeter=0; ;or(:Yoc-
bih.biYPelsPerMeter=0; ?)7uwJsH
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Qwk
static int filecount=0; lKI1bs]i
CString name; >f19P+
name.Format("pict%04d.bmp",filecount++); pQ*9)C
name=m_Path+name; 6t
TLyI$+
BITMAPFILEHEADER bfh; iquB]z'
bfh.bfReserved1=bfh.bfReserved2=0; +%6{>C+bZo
bfh.bfType=((WORD)('M'<< 8)|'B'); t'_Hp},
bfh.bfSize=54+size; b'O>&V`
bfh.bfOffBits=54; A(W%G|+
CFile bf; FsY}mql
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ wQ*vcbQX*
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7h<Q{X<A
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 23qTmh
bf.WriteHuge(lpData,size); $91c9z;f^
bf.Close(); NUEy0pLw
nCount++; kG
&.|
} -$?xR]( f
GlobalFreePtr(lpData); y;yXOE_
if(nCount==1) nu}$wLM
m_Number.Format("%d picture captured.",nCount); <G{m=
else 782be-n
m_Number.Format("%d pictures captured.",nCount); qWHH%
L;
UpdateData(FALSE); _$NFeqLww
} p8oOm>B96n
8uM >Up X
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) *&+e2itmp
{ )~T)$TS
if(pMsg -> message == WM_KEYDOWN) ~{0:`)2FQ
{ &kHp}\
if(pMsg -> wParam == VK_ESCAPE) rm;'/l8Y-E
return TRUE; V2,54YE
if(pMsg -> wParam == VK_RETURN) ,_r"=>?@
return TRUE; =_\5h=`Yx
} 7UejK r
return CDialog::PreTranslateMessage(pMsg); 4cRF3$amd
} VljAAt
wXMKQ)$(
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1% ]|O
{ U>IllNd
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ '+?AaR&p?
SaveBmp(); ,u#uk7V
return FALSE; 5:Pp62
} xKWqDt
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =zDU!< U
CMenu pop; P_B#
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ah;2\0|t
CMenu*pMenu=pop.GetSubMenu(0); Y|_#yb
pMenu->SetDefaultItem(ID_EXITICON); B&Q\J>l9S
CPoint pt; od{Y`
.<
GetCursorPos(&pt); ^I~2t|}
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); c$rkbbf~V
if(id==ID_EXITICON) yMq&9R9F
DeleteIcon(); .9
mwRYgD
else if(id==ID_EXIT) F^7qLvh
OnCancel(); Yc3\NqQM
return FALSE; X|q&0W=
} P,k~! F^L
LRESULT res= CDialog::WindowProc(message, wParam, lParam); klxVsx%I{G
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) t
9&xk?%{
AddIcon(); :tp2@*]9Z
return res; J0*hJ-/u
} K 4QJDC8
%'a%ynFs
void CCaptureDlg::AddIcon() _Db=I3.HJ
{ y >r7(qg
NOTIFYICONDATA data; hEi]-N\X
data.cbSize=sizeof(NOTIFYICONDATA); {YC!pDG
CString tip; C8rD54A'M
tip.LoadString(IDS_ICONTIP); >A5R
data.hIcon=GetIcon(0); Q1jU{
data.hWnd=GetSafeHwnd(); )uC],CbW{
strcpy(data.szTip,tip); @wy|l)%
data.uCallbackMessage=IDM_SHELL; X1&Ug^
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; NdGIH/Y;M
data.uID=98; 7zXFQ|TP
Shell_NotifyIcon(NIM_ADD,&data); v".q578
0B
ShowWindow(SW_HIDE); fft FNHP
bTray=TRUE; JQ=i{ 9iJ
} _x&;Fa%
gD10C,{
void CCaptureDlg::DeleteIcon() {a^A-Xh[u
{ 0B fqEAl
NOTIFYICONDATA data; 8@]*X,umc
data.cbSize=sizeof(NOTIFYICONDATA); W^npzgDCo
data.hWnd=GetSafeHwnd(); n|2`y?
data.uID=98; Z>gxECi
Shell_NotifyIcon(NIM_DELETE,&data); `bT!_ Ru
ShowWindow(SW_SHOW); W t4ROj
SetForegroundWindow(); mbB,j~;^6H
ShowWindow(SW_SHOWNORMAL); g\S@@0T{0
bTray=FALSE; (DJLq
} :Rv?>I j
0T7(c-
void CCaptureDlg::OnChange() !Ob
{ %a=K:" oU[
RegisterHotkey(); >}Qj|05G
} Ec
IgX_\
9pUvw_9MY
BOOL CCaptureDlg::RegisterHotkey() fZ1v|
{ :f%FM&b
UpdateData(); DX GClH
UCHAR mask=0; VN[C%C
UCHAR key=0; 59mNb:<
if(m_bControl) K~ ,|~
mask|=4; ZycV?ob8}
if(m_bAlt) s3qWTdM
mask|=2; nfpkWyI u{
if(m_bShift) `q|&;wP.
mask|=1; mAMi-9
key=Key_Table[m_Key.GetCurSel()]; N`XJA-DE
if(bRegistered){ 56gpAc
DeleteHotkey(GetSafeHwnd(),cKey,cMask); U"$Q$ OFs
bRegistered=FALSE; Ck;O59A"&-
} 7?Q@Hj(:NT
cMask=mask; o#3?")>|
cKey=key; y_EkW
f
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )*#Pp )Q
return bRegistered; H,,-;tN?
} M2HO!btf
ALvj)I`Al
四、小结 AzAD76iNv
ASmMj;>UM
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。