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:
u%XFFt5
*uA?}XEfi 一、实现方法
<e/O"6='Z ?=r!b{9 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:
{D."A$AAa nz+o8L, #pragma data_seg("shareddata")
'3+S5p8 HHOOK hHook =NULL; //钩子句柄
R#Bt!RNZ UINT nHookCount =0; //挂接的程序数目
D.*JG7;=Z static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
OiM{@ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
&=$8
v"&^ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
ngeX+@ static int KeyCount =0;
^z[s;:- static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
\RQ5$!O #pragma data_seg()
.8b4 Cf`UMQ a 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。
\M>AN
Z} Q.z2 (& 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:
}[LK/@h KO)<Zh BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
`(Q58wR} cKey,UCHAR cMask)
hZ2PP ^ {
7MoO2 BOOL bAdded=FALSE;
+QldZba for(int index=0;index<MAX_KEY;index++){
{H])Fob if(hCallWnd[index]==0){
PDD` eK}Fj hCallWnd[index]=hWnd;
*k+QX HotKey[index]=cKey;
:\4O9f*5+ HotKeyMask[index]=cMask;
})mez[UmZ bAdded=TRUE;
U}gYZi;;$ KeyCount++;
/jj@ =H break;
U-WrZ|- }
{GHGFi`Z }
yt!K|g return bAdded;
Z#V[N9L }
uUc[s"\ //删除热键
-F8%U:2a BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
3g-}k {
J,7_5V@jJ BOOL bRemoved=FALSE;
a#uJzYB0 for(int index=0;index<MAX_KEY;index++){
8$G$Rdn if(hCallWnd[index]==hWnd){
i3e|j(Gs4 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
q8kt_&Ij hCallWnd[index]=NULL;
g^0 HotKey[index]=0;
"Ww^?"jQ) HotKeyMask[index]=0;
Ho\+xX bRemoved=TRUE;
=602%ef\ KeyCount--;
KJ9~"v
break;
,(c="L4[ }
FfD2
&(-R }
29av8eW?3 }
PY>j?otD return bRemoved;
3_33@MM }
jWU)y)$ NoKYHN^*w i^QcW!X& DLL中的钩子函数如下:
(qPZEZKx 57[O)5u.+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
JRodYXjE {
l BOOL bProcessed=FALSE;
\[>Rt if(HC_ACTION==nCode)
{|rwIRe {
dDm<'30?*v if((lParam&0xc0000000)==0xc0000000){// 有键松开
YDmFR,047 switch(wParam)
*-P@|eg {
B"Fg`s+]U case VK_MENU:
-C8awtbC MaskBits&=~ALTBIT;
>Zr/U!W*? break;
Pc4sReo' case VK_CONTROL:
)L#I#% MaskBits&=~CTRLBIT;
0j_!)B break;
'fVk1Qj^ case VK_SHIFT:
GGLVv) MaskBits&=~SHIFTBIT;
}>0UaK break;
\lY26' default: //judge the key and send message
w6wXe_N+M break;
OKf/[hyu }
;$%+TN for(int index=0;index<MAX_KEY;index++){
Pt1Htt:BE if(hCallWnd[index]==NULL)
aqyXxJS8 continue;
P,># if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
p1|@F^Q {
H>Fy 2w SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
CV&
SNA bProcessed=TRUE;
$hE X, }
Wo2M}]0 }
h[lh01z }
>5 i8%r else if((lParam&0xc000ffff)==1){ //有键按下
5 TnECk switch(wParam)
#v~5f;[AAs {
^T<<F}@q case VK_MENU:
#K4wO!d MaskBits|=ALTBIT;
6'Lij&,f?{ break;
7M$>'PfO case VK_CONTROL:
Fe/*U4xU MaskBits|=CTRLBIT;
FJ2^0s/" break;
2^:5aABQ case VK_SHIFT:
3F4I{L MaskBits|=SHIFTBIT;
|H
|ewVUY break;
sXfx[)T< default: //judge the key and send message
k*n5+[U^tP break;
=XWi+') }
s\ ~r
8 for(int index=0;index<MAX_KEY;index++){
YHAy+S if(hCallWnd[index]==NULL)
`GSfA0? continue;
/sYD+*a if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
a2g1 5;kM {
+q=/}| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
F5*Xx g}N bProcessed=TRUE;
Rq\.RR]( }
)fC^h=Qp }
w-\GrxlbX }
J@)6]d/, if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
QGYmQ9m{kL for(int index=0;index<MAX_KEY;index++){
VvPTL8Z if(hCallWnd[index]==NULL)
\.*aC) continue;
lJK U^?4S8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
&]ImO
RN SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
IRcZyry //lParam的意义可看MSDN中WM_KEYDOWN部分
:Tjo+vw7$H }
xl<Cstr }
>Vg<J~[g }
^WVr@6 return CallNextHookEx( hHook, nCode, wParam, lParam );
|#MA?oz3T }
JM!o(zbt EmH2 Dbw 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
yCmiW
%L4 W/&cnp\ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
p'_*>%4~ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
tt`b+NOH> m"xw5aa> 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
Z$+0gm\Cnw fc&4e:Ve LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
g8B@M*JA {
j[c|np4k\ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
,H.q%!{h_ {
q5QYp //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
P+oZS SaveBmp();
v_oNM5w return FALSE;
#Ok*Or }
*xt3mv/<z …… //其它处理及默认处理
OHH wcJ 7N }
W**a\[~$ &%INfl>o7. QPdhesrd- 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。
x==%BBnO% a[t2TjB 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。
~KCOCtiD ku?i[Th 二、编程步骤
i"zWv@1z p5Y"W(5_ 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";
r6j
3A `F(KM ' 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
^
b}_[B qL3*H\9N 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;
jYuH
zf &grT} 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{9di\xnEm Oi=kL{DG:s 5、 添加代码,编译运行程序。
VBsS1!g O~ w&4F;{ 三、程序代码
&s\w:
9In Lymy/9 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Ga$+x++'* #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
#=+d;RdlW #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
XG*Luc-v #if _MSC_VER > 1000
6x6PP}IX #pragma once
`&j5/[>v #endif // _MSC_VER > 1000
R~;<}!Gtx #ifndef __AFXWIN_H__
nKufVe #error include 'stdafx.h' before including this file for PCH
tE- s/ #endif
g)2}`} #include "resource.h" // main symbols
=3l%ZL/ class CHookApp : public CWinApp
"M1[@xog {
}<A\> public:
fnwtD*`` CHookApp();
F}.<x5I-;h // Overrides
$^d,>hJi // ClassWizard generated virtual function overrides
I=|b3- //{{AFX_VIRTUAL(CHookApp)
tecCU[O public:
(|"KsGl virtual BOOL InitInstance();
XkOsnI8n virtual int ExitInstance();
d\D.l^ //}}AFX_VIRTUAL
^q7
fN0"6 //{{AFX_MSG(CHookApp)
\h?C
G_|] // NOTE - the ClassWizard will add and remove member functions here.
: xB<Rq // DO NOT EDIT what you see in these blocks of generated code !
TU7 Qt< //}}AFX_MSG
t%V!SvT8+ DECLARE_MESSAGE_MAP()
U c$RYPq };
K`768%q LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
9UZKL@KC BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
jL>IX`,+6 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
8?h-H#h BOOL InitHotkey();
ytKh[Uo BOOL UnInit();
U"af3c^2 #endif
9JpPas$] $9j\sZj& //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
; Sq_DP1W #include "stdafx.h"
tJ i#bg% #include "hook.h"
b_:]Y<{> f #include <windowsx.h>
m "h{HgJd #ifdef _DEBUG
seB ^o} #define new DEBUG_NEW
a9` E&Q}z #undef THIS_FILE
v&D^N9hy9 static char THIS_FILE[] = __FILE__;
tc.R(F96 #endif
5ZSV)$t #define MAX_KEY 100
8dNwi&4 #define CTRLBIT 0x04
7q^osOj" #define ALTBIT 0x02
y08.R.
l #define SHIFTBIT 0x01
|Xlpgdiu #pragma data_seg("shareddata")
4(f[Z9 iZ] HHOOK hHook =NULL;
db'Jl^ UINT nHookCount =0;
Zchs/C 9{ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
2X!O ' static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
{'NdN+_C static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
B#N(PvtE static int KeyCount =0;
D
]: sR static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
R6r'[-B2 #pragma data_seg()
Cq(dj^/~m HINSTANCE hins;
Xk8+m> void VerifyWindow();
)xy1DA BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
(:4N#p //{{AFX_MSG_MAP(CHookApp)
uK2MC?LP // NOTE - the ClassWizard will add and remove mapping macros here.
b*\K I // DO NOT EDIT what you see in these blocks of generated code!
xlZ"F //}}AFX_MSG_MAP
?4P*,c END_MESSAGE_MAP()
ryg1o=1v/ bx_`S#*N CHookApp::CHookApp()
?suNA {
g[!t@K // TODO: add construction code here,
w$MFCJ:p& // Place all significant initialization in InitInstance
NTkGLD1e. }
YIvJN oJA%t-&%R CHookApp theApp;
$e)d!m. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
J=JYf_=4bc {
~Pq1@N>n BOOL bProcessed=FALSE;
:
9wW*Ix if(HC_ACTION==nCode)
oi^2Pvauh {
33z)F if((lParam&0xc0000000)==0xc0000000){// Key up
^1sX22k switch(wParam)
$6kVhE!; {
$vlq]6V8 case VK_MENU:
BT.;l I MaskBits&=~ALTBIT;
\09eH[ break;
_~ZNX+4 case VK_CONTROL:
rXPq'k'h#- MaskBits&=~CTRLBIT;
w7@fiH{ break;
3(0k!o0" case VK_SHIFT:
ze@NqCF MaskBits&=~SHIFTBIT;
(A|Gb2 X break;
@KfFtR-; default: //judge the key and send message
D~E1hr&Vd> break;
a|Io)Qhr }
eKPxSN Z for(int index=0;index<MAX_KEY;index++){
h,o/(GNnW if(hCallWnd[index]==NULL)
j6]+fo&3 continue;
+P:xB0Tm
D if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
YBqu7& {
uLX5khQ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
l=,\ h& bProcessed=TRUE;
e33 j&:O }
>qk[/\^O }
#Mkwd5S|L }
,:Qy%k}f else if((lParam&0xc000ffff)==1){ //Key down
Fa:fBs{ switch(wParam)
h
U\)CM {
{>PN}fk2QP case VK_MENU:
6A&e2K> A
MaskBits|=ALTBIT;
KJ M:-z@ break;
ufyqfID case VK_CONTROL:
Dvbrpn!sk MaskBits|=CTRLBIT;
q1}HsTnBH break;
g`I`q3EF) case VK_SHIFT:
yV[9 ( MaskBits|=SHIFTBIT;
"Ah (EZAR
break;
l$N
b1& default: //judge the key and send message
#-*7<wN break;
sLrSi }
Z
M_
6A1 for(int index=0;index<MAX_KEY;index++)
*5?a%p {
RZ 4xR if(hCallWnd[index]==NULL)
{G$I|<MD2T continue;
zO8`xrN! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
K(@QKRZ7[ {
g S xK9P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
d*Q:[RUf, bProcessed=TRUE;
itClCEOA }
~'>RK }
0goKiPx }
"h?;)Ye if(!bProcessed){
K;moV| j for(int index=0;index<MAX_KEY;index++){
:ZG^`H/X1d if(hCallWnd[index]==NULL)
&9X`tCnL continue;
7ADh if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
e&%m[:W:< SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
|TM&:4D]^ }
|<tZ| }
XN65bq }
FYq]-k{\ return CallNextHookEx( hHook, nCode, wParam, lParam );
9ZFvN*Zf' }
oE@{h$= tgoOzk^ BOOL InitHotkey()
AE0d0Y~9 {
64xq@_+ if(hHook!=NULL){
=+;1^sZ nHookCount++;
^T*^L=L_( return TRUE;
1&N|k;#QS }
:&:IZkO else
&* GwA hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
{];4 if(hHook!=NULL)
oz
$T. nHookCount++;
mw0#Dhyy1= return (hHook!=NULL);
jusP
aAdW }
h<;kj#qbb BOOL UnInit()
bL*;6TzRK {
[GKSQt{) if(nHookCount>1){
0w^\sf%s nHookCount--;
3S='/^l return TRUE;
w}n:_e }
]yu,YZ@7 BOOL unhooked = UnhookWindowsHookEx(hHook);
L$zI_
z if(unhooked==TRUE){
#;cDPBv*wS nHookCount=0;
KQ'fp:5|/@ hHook=NULL;
jCdKau&9 }
3&i8C,u]/O return unhooked;
kcT?<r }
\%\b*OO [ox!MQ+s BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
r"#h6lYK& {
5<Mht6"H BOOL bAdded=FALSE;
_\yrR.HIa for(int index=0;index<MAX_KEY;index++){
9`{[J['V if(hCallWnd[index]==0){
2}`Q9? hCallWnd[index]=hWnd;
DF D5">g@ HotKey[index]=cKey;
fq-$u;~h HotKeyMask[index]=cMask;
63:0Vt>hZ^ bAdded=TRUE;
/;LteBoY KeyCount++;
k1;,eB break;
[?TQ!l} 8A }
)US|&>
o8 }
2{naSiaq return bAdded;
0_JbE }
'TclH80 }G
n2% BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
AU1P?lk {
#6{"cr6l BOOL bRemoved=FALSE;
il^SGH for(int index=0;index<MAX_KEY;index++){
E.W7`zl if(hCallWnd[index]==hWnd){
tV2SX7N if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
o?A/ hCallWnd[index]=NULL;
5wXe^G HotKey[index]=0;
.&2p Z HotKeyMask[index]=0;
+kCVi bRemoved=TRUE;
W"9iFj X KeyCount--;
N{n}]Js1D- break;
6_/oVvd }
!ZP1?l30 }
|u8hxa }
X;_0"g return bRemoved;
.XM3oIaW }
rN#ydw:9 X'N4a void VerifyWindow()
<LM<, {
iqf+rBL for(int i=0;i<MAX_KEY;i++){
$hB;r if(hCallWnd
!=NULL){ m'1NZV%#
if(!IsWindow(hCallWnd)){ #|^7{TN
hCallWnd=NULL; 2D-ogSIo
HotKey=0; qg#WDx /
HotKeyMask=0; Bv"Fx*{W
KeyCount--; WH :+HNl1d
} L;.6j*E*
} X70 vDoW
} ~h -G
} 5n;|K]UW
Avw"[~Xd
BOOL CHookApp::InitInstance() 9[5NnRv$P
{ 2YK4SL
AFX_MANAGE_STATE(AfxGetStaticModuleState()); n`f},.NM|
hins=AfxGetInstanceHandle(); s%]-Sw9
InitHotkey(); :K{`0U&l5
return CWinApp::InitInstance(); tF)K$!GR[
} Lc^nNUzPo
$I_04k#t
int CHookApp::ExitInstance() [ d<|Cde
{ HC
w$v#
VerifyWindow(); jsTb0
UnInit(); `xe[\Z2
return CWinApp::ExitInstance(); :7Mo0,Bw,
} RLY Ae
k1>%wR
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {npKdX
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) aA%$<ItH
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >rlQY>5pH
#if _MSC_VER > 1000 "%ag^v9
#pragma once L.(T"`-i
#endif // _MSC_VER > 1000 Y">tfLIL_
|w[}\#2
class CCaptureDlg : public CDialog R@>R@V>c
{ [a;lYsOsJ
// Construction ~bT0gIc
public: Kbx (^f12
BOOL bTray; Q3%a=ba)h
BOOL bRegistered; _5M!ec
BOOL RegisterHotkey(); EH3jzE3N
UCHAR cKey; lsW.j#yE!
UCHAR cMask; S$%/9^\jF
void DeleteIcon(); 6f6_ztTL
void AddIcon(); aGp <%d
UINT nCount; Hk2@X(
void SaveBmp(); 0]8+rWp|Nz
CCaptureDlg(CWnd* pParent = NULL); // standard constructor FVG|5'V^
// Dialog Data 3leg,qd
//{{AFX_DATA(CCaptureDlg) ^w2n
enum { IDD = IDD_CAPTURE_DIALOG }; Pb} &c
CComboBox m_Key; `(;d+fof
BOOL m_bControl; .5L/<
BOOL m_bAlt; s5|LD'o!
BOOL m_bShift; 7x9YA$IE
CString m_Path; &m8B%9w
CString m_Number; cv:nlq)
//}}AFX_DATA CCq<y
// ClassWizard generated virtual function overrides K1O/>dN_\O
//{{AFX_VIRTUAL(CCaptureDlg) T'XAcH
public: _1y|#o
virtual BOOL PreTranslateMessage(MSG* pMsg); 2EE/xnwX
protected: O,qR$#l
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iBJ*6orz
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); *sJx0<!M}
//}}AFX_VIRTUAL F&lc8
// Implementation Sc Gmft3A
protected: 9Lz)SYd
HICON m_hIcon; qCgP8U/jv
// Generated message map functions a}E8ADyC
//{{AFX_MSG(CCaptureDlg) HT?`PG
virtual BOOL OnInitDialog(); ?RWd"JTGue
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); uNXh"?
afx_msg void OnPaint(); `k\]I |6
afx_msg HCURSOR OnQueryDragIcon(); b,T=0W
virtual void OnCancel(); Zpb3>0<R
afx_msg void OnAbout(); m)_1->K
afx_msg void OnBrowse(); /UyW&]nK
afx_msg void OnChange(); [%l+
C~m
//}}AFX_MSG 58e{WC
DECLARE_MESSAGE_MAP() Zy*}C,Z
}; 3{M IBMA
#endif e@]cI/j
oE)c8rE
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file oK5(,8
(4
#include "stdafx.h" 8GlH)J+kq
#include "Capture.h" " "a+Nc
#include "CaptureDlg.h" D{BH~IM
#include <windowsx.h> }T,E$vsx
#pragma comment(lib,"hook.lib") D4#,9?us
#ifdef _DEBUG &KR@2~vE
#define new DEBUG_NEW [9(B;;R@
#undef THIS_FILE
L$jyeFB5
static char THIS_FILE[] = __FILE__; ;SC|VcbyH
#endif sef!hS06
#define IDM_SHELL WM_USER+1 't)j
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); fE7WLV2I>
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8-?n<h%8E
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; dJ24J+9}]j
class CAboutDlg : public CDialog ixKQh};5/
{ kIWQ`)'
public: M!X@-t#
CAboutDlg(); UO:>^,(j
// Dialog Data BM&'3K_y
//{{AFX_DATA(CAboutDlg) gX(QRQ
enum { IDD = IDD_ABOUTBOX }; v?LJ_>hw*T
//}}AFX_DATA =?*V3e3{
// ClassWizard generated virtual function overrides 3J,/bgL5
//{{AFX_VIRTUAL(CAboutDlg) *c3o&-ke9
protected: 9 oq(5BG,
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support cQ+,F2
//}}AFX_VIRTUAL :He:Bdk
// Implementation /=r&9P@Ay<
protected: \17)=W
//{{AFX_MSG(CAboutDlg) n.1a1 Tf
//}}AFX_MSG P{>T?-Hj
DECLARE_MESSAGE_MAP() ?q,x?`|(8
}; WLh_b)V|
LoCxoAg
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) "R9kF-
{ H`io|~Q
//{{AFX_DATA_INIT(CAboutDlg) fZ
%ZV
//}}AFX_DATA_INIT HPCA,*YR`
} _v$mGZpGY
O0$ijJa|
void CAboutDlg::DoDataExchange(CDataExchange* pDX) P2s0H+<
{ 6kDU}]c:H]
CDialog::DoDataExchange(pDX); ih YfWG|
//{{AFX_DATA_MAP(CAboutDlg) 5cE[s<=
//}}AFX_DATA_MAP Xif`gb6`
} "R30oA#m
O-'T*M>
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) A|a\pL` @
//{{AFX_MSG_MAP(CAboutDlg) 3=K-+dhk|t
// No message handlers Ys3C'Gc
//}}AFX_MSG_MAP G:&Q)_
END_MESSAGE_MAP() DHJnz>bE
4PF4#
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) <s{/ka3
: CDialog(CCaptureDlg::IDD, pParent) #{?oUg>$
{ _|Dt6
//{{AFX_DATA_INIT(CCaptureDlg) !EW]:u
m_bControl = FALSE; oNh .Zgg
m_bAlt = FALSE; R1m18GHQ
m_bShift = FALSE; ,}|V'y
m_Path = _T("c:\\"); :8QG$Ua1
m_Number = _T("0 picture captured."); H{ $ yy)@F
nCount=0; "1nd~
BBOw
bRegistered=FALSE; j68Gz5;j
bTray=FALSE; hs*:!&E
//}}AFX_DATA_INIT {Y/
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 02+^rqIx5
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); r-0
7!A
} ){(cRB $
Ud9\;Qse
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ]E3g8?L
{ ;kF p)*i
CDialog::DoDataExchange(pDX); 23fAc"@ B
//{{AFX_DATA_MAP(CCaptureDlg) 9"aTF,'F/
DDX_Control(pDX, IDC_KEY, m_Key); v m$v[
DDX_Check(pDX, IDC_CONTROL, m_bControl); zld>o3K}
DDX_Check(pDX, IDC_ALT, m_bAlt); gI%n(eY
DDX_Check(pDX, IDC_SHIFT, m_bShift); |JDJ{;o
DDX_Text(pDX, IDC_PATH, m_Path); nbRg<@
DDX_Text(pDX, IDC_NUMBER, m_Number); UM]wDFn'E
//}}AFX_DATA_MAP a3)#tt=rA
} j>:T)zhyY
V , "'k<y
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ynd}w
G'
//{{AFX_MSG_MAP(CCaptureDlg) L7b{H2 2
ON_WM_SYSCOMMAND() @Uu\x~3y
ON_WM_PAINT() x~z 2l#ow
ON_WM_QUERYDRAGICON() -|T^
ON_BN_CLICKED(ID_ABOUT, OnAbout) Af%?WZlOq
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) GJ$,@
ON_BN_CLICKED(ID_CHANGE, OnChange) g-s@m}[T
//}}AFX_MSG_MAP oe<Y,%u"6
END_MESSAGE_MAP() hh{liS% 10
OH(+]%B78
BOOL CCaptureDlg::OnInitDialog() WT)")0)[
{ >fdN`W}M
CDialog::OnInitDialog(); O*PHo_&G
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )
jvkwC
ASSERT(IDM_ABOUTBOX < 0xF000); RAxz+1JT
CMenu* pSysMenu = GetSystemMenu(FALSE); &sWyh[`P
if (pSysMenu != NULL) PLyu1{1"z
{ _aGdC8%[
CString strAboutMenu; {+EPE2X=C
strAboutMenu.LoadString(IDS_ABOUTBOX); i_@RWka<
if (!strAboutMenu.IsEmpty()) i@6
/#
{ r]S9z
pSysMenu->AppendMenu(MF_SEPARATOR); ,ym;2hJ
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #(H_w4
} R}VL UL$
} I6fpXPP).
SetIcon(m_hIcon, TRUE); // Set big icon -a[{cu{
SetIcon(m_hIcon, FALSE); // Set small icon >tzXbmFp;
m_Key.SetCurSel(0); _7 ;^od=C
RegisterHotkey(); #+G2ZJxL|
CMenu* pMenu=GetSystemMenu(FALSE); P:TpB6.=q
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); qw/{o:ce]
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 1L|(:m+
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ? `KOW
return TRUE; // return TRUE unless you set the focus to a control w;(gi
} {|%O)fr,
Dfo9jYPf
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8GP}g?%
{ (
A) wcB
if ((nID & 0xFFF0) == IDM_ABOUTBOX) *J=ol
{ 1`t?5|s>
CAboutDlg dlgAbout; NZuFxJ-`
dlgAbout.DoModal(); jJvNN -^
} EHHxCq?
else bij?q\
{ 6~S0t1/t?
CDialog::OnSysCommand(nID, lParam); ihWz/qx&q
} )8SP$
} {+:XVT_+
m { fQL
void CCaptureDlg::OnPaint() ar|[D7Xrq\
{ \gkajY-?
if (IsIconic()) dWy1=UQfP
{ Z]f2&
CPaintDC dc(this); // device context for painting x,dv~QU
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 3Y-v1.^j
// Center icon in client rectangle H~i],WD
int cxIcon = GetSystemMetrics(SM_CXICON); f zO8by
int cyIcon = GetSystemMetrics(SM_CYICON); -#6*T,f0P(
CRect rect; )mdNvb[*n
GetClientRect(&rect); 7
L\?
int x = (rect.Width() - cxIcon + 1) / 2; to 6Q90(
int y = (rect.Height() - cyIcon + 1) / 2; y7OG[L/
// Draw the icon &*aU2{,s,;
dc.DrawIcon(x, y, m_hIcon); T6$<o\g'
} cloI 6%5r
else PNgMLQI6
{ DZRxp,
CDialog::OnPaint(); l`&6W?C
} c5e\ckqm^
} S$52KOo
H>f{3S-%
HCURSOR CCaptureDlg::OnQueryDragIcon() )yW_O:
{ hhAC@EGG
return (HCURSOR) m_hIcon; PEEY;x
} bOMP8{H,
sjgR \`AU
void CCaptureDlg::OnCancel() 0
0&$SE
{ g{hA,-3
if(bTray) [Z\1"m
DeleteIcon(); ?w/nZQWi
CDialog::OnCancel(); .~L4#V{c~
} zI! R-Nb
acY[?L_6J
void CCaptureDlg::OnAbout() ;/ KF3
%
{ gc3 U/
jM
CAboutDlg dlg; 7RE6y(V1
dlg.DoModal(); vw]
D{OBv*
} ZHlin#"
\)ZX4rs{8
void CCaptureDlg::OnBrowse() t[,T}BCy.
{ 5,BkwAr+6[
CString str; y=xe<#L
BROWSEINFO bi; g/Jj]X#r
char name[MAX_PATH]; cGta4;
ZeroMemory(&bi,sizeof(BROWSEINFO)); IQ=|Kj9h
bi.hwndOwner=GetSafeHwnd(); ,7jiHF
bi.pszDisplayName=name; }#>d2 =T$
bi.lpszTitle="Select folder"; n "KJB
bi.ulFlags=BIF_RETURNONLYFSDIRS; _np>({
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Uv`v|S:+2
if(idl==NULL) jjT2k
return; MZW
Y
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <S@mQJS!y
str.ReleaseBuffer(); vC<kpf!
m_Path=str; ]#q7}Sd
if(str.GetAt(str.GetLength()-1)!='\\') `OReSg
2
m_Path+="\\"; %GCd?cFF
UpdateData(FALSE); D.R|HqZ
} 8sF0]J[g{
;To+,`?E;q
void CCaptureDlg::SaveBmp() @-@rG>y^:
{ h;UdwmT
CDC dc; Pq\V($gN
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Z?v6pjZ?
CBitmap bm;
"rDzrz
int Width=GetSystemMetrics(SM_CXSCREEN); }_ :#fE
int Height=GetSystemMetrics(SM_CYSCREEN); =tRe3o0(
bm.CreateCompatibleBitmap(&dc,Width,Height); -sH.yAvC6
CDC tdc; k,iV$,[TF
tdc.CreateCompatibleDC(&dc); Ox*T:5
CBitmap*pOld=tdc.SelectObject(&bm); k>;r9^D
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); i-s?"Fk
tdc.SelectObject(pOld); W<N QUf[=
BITMAP btm; 7K]U|K#
bm.GetBitmap(&btm); D3AtYt
DWORD size=btm.bmWidthBytes*btm.bmHeight; Ldj^O9p(
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); PSqtZN
BITMAPINFOHEADER bih; ~uZLe\>K
bih.biBitCount=btm.bmBitsPixel; VfC[U)w*vm
bih.biClrImportant=0; ySK Yqt z
bih.biClrUsed=0; p F*~)e
bih.biCompression=0; OjlB0
bih.biHeight=btm.bmHeight; K^&
]xFW
bih.biPlanes=1; .'{6u;8
bih.biSize=sizeof(BITMAPINFOHEADER); ID).*@(I"
bih.biSizeImage=size; _KhEwd
bih.biWidth=btm.bmWidth; ]#-/i2-K
bih.biXPelsPerMeter=0; CE7pg&dJ)i
bih.biYPelsPerMeter=0; e9hVX[uq
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6dR-HhF
static int filecount=0; m>-^K
CString name; u3i|}`
name.Format("pict%04d.bmp",filecount++); "ko?att~
name=m_Path+name; 9Bvn>+_K
BITMAPFILEHEADER bfh; C`~4q<W'
bfh.bfReserved1=bfh.bfReserved2=0; F;&fx(
bfh.bfType=((WORD)('M'<< 8)|'B'); 9k+&fyy
bfh.bfSize=54+size; (T#(A4:6S
bfh.bfOffBits=54; vl{_M*w
;
CFile bf; m57tOX
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /Zeg\}/4[
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); zmfRZ!Eh
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); %)hIpxOrX
bf.WriteHuge(lpData,size); Or#+E2%1E
bf.Close(); #
/,2MQ
nCount++; {{[jC"4AY
} g9weJ6@}M
GlobalFreePtr(lpData); +yP[(b/
if(nCount==1) ZJI1NCBZ
m_Number.Format("%d picture captured.",nCount); 3| '#n[3
else JXRf4QmG
m_Number.Format("%d pictures captured.",nCount); (zw=qbS&
UpdateData(FALSE); "G-0i KW;
} 60~>f)vu
b^l
-*4
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Rr;LV<q+
{
vD)A)
if(pMsg -> message == WM_KEYDOWN) T.w}6?2
{ $L&9x3+?Kg
if(pMsg -> wParam == VK_ESCAPE) B[/['sD
return TRUE; LY88;*:S
if(pMsg -> wParam == VK_RETURN) lF}$`6
return TRUE; X?v^>mA
} 3VRZM@i
return CDialog::PreTranslateMessage(pMsg);
Eagmafu
} B-ri}PA
G_, t\
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) k"^t?\Q%vI
{ .M53, 8X
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &b@!DAwAJ
SaveBmp(); 9p\wTzA
return FALSE; 1nlE3Y?AV
} sRe#{EuJ
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Q!2iOvK
CMenu pop; JPT I6"/
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [cTRz*\s
CMenu*pMenu=pop.GetSubMenu(0); K@j^gF/0B
pMenu->SetDefaultItem(ID_EXITICON); c]aK
N
CPoint pt; F3Ak'h{Ay
GetCursorPos(&pt); */5<L99v
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); fdq^!MWTi
if(id==ID_EXITICON) 6PQJgki
DeleteIcon(); z5yb$-j
else if(id==ID_EXIT) ;*g*DIR
OnCancel(); QC\g%MVG
return FALSE; rPo\Dz
} TA@tRGP>
LRESULT res= CDialog::WindowProc(message, wParam, lParam); l`M5'r]l
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) d[>N6?JA/
AddIcon(); +zVcOS*-
return res; 2NArE@
} :9x084ESR)
`3sy>GU?
void CCaptureDlg::AddIcon() [nN\{"~O
{ \Sq"3_m4T
NOTIFYICONDATA data; _sf#J|kQ
data.cbSize=sizeof(NOTIFYICONDATA); ~g
K-5}%!
CString tip; 7k`*u) Q
tip.LoadString(IDS_ICONTIP); u.pKK
data.hIcon=GetIcon(0); AK~`pq[.
data.hWnd=GetSafeHwnd(); SP
D207
strcpy(data.szTip,tip); 9HJ'p:{)
data.uCallbackMessage=IDM_SHELL; (Xr_ np @
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4*D fI
data.uID=98; Kixr6\
Shell_NotifyIcon(NIM_ADD,&data); l#5~t|\
ShowWindow(SW_HIDE); B::4Qme
bTray=TRUE; LpiHoavv
} 7$1fy0f[l
#E$Z[G]
void CCaptureDlg::DeleteIcon() _']%qd"%
{ 35%[DUkb
NOTIFYICONDATA data; N)vk0IM!
data.cbSize=sizeof(NOTIFYICONDATA); }o!#_N0T
data.hWnd=GetSafeHwnd(); Xew1LPI
data.uID=98; StdS$XW
Shell_NotifyIcon(NIM_DELETE,&data); O7'<I|aD
ShowWindow(SW_SHOW); /+x#V!zM
SetForegroundWindow(); wzDk{4U
ShowWindow(SW_SHOWNORMAL); c+Q.?vJ
bTray=FALSE; t4jd
KYA
} j5,^9'
dK J@{d
void CCaptureDlg::OnChange() t> x-1vf%
{ wZo.ynXT
RegisterHotkey(); ~<2 IIR$H
} hr_9;,EPh
H4}%;m%
BOOL CCaptureDlg::RegisterHotkey() HvqF@/xh
{ E VN-<=i^
UpdateData(); S/nj5Lh
UCHAR mask=0; ;LQ# *NjL\
UCHAR key=0; l\T!)Ql
if(m_bControl) I+Ncmg )>
mask|=4; Xx3g3P
if(m_bAlt) w'oo-.k
mask|=2; z_:eM7]jv
if(m_bShift) J0ZxhxX35
mask|=1; XSm"I[.g
key=Key_Table[m_Key.GetCurSel()]; q3AJwELXw
if(bRegistered){ n*vTVt)dJ
DeleteHotkey(GetSafeHwnd(),cKey,cMask); H{\.g=01
bRegistered=FALSE; E(QZ!'%K+m
} PJxak3
cMask=mask; VxkCK02k
cKey=key; ZR;8rZ](
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); M#\ <
return bRegistered; E[|s>Xv~
} %]a
@A8o0
%Ycx C0S[
四、小结 kf%&d}2to
"*++55
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。