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:
1$E [`` n
ZrEou}z(* 一、实现方法
N\ Mdia 4h!yh2c.. 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
Z72%Bv c!6v-2ykv #pragma data_seg("shareddata")
]lfufjj HHOOK hHook =NULL; //钩子句柄
Hif|z[0$ UINT nHookCount =0; //挂接的程序数目
xI?'Nh static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
9?ll(5E static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
A]0R?N9wb_ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
H4
O"^#5 static int KeyCount =0;
jbS@6 *_ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
h/\Zq #pragma data_seg()
OXM=@B<" S;Sy.Lp 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。
lH_pG ~ K\Q4u4DjbJ 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:
%1k"K~eu |;a$
l(~< BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
t'$_3ml cKey,UCHAR cMask)
n-M6~ {
""
^n^$ BOOL bAdded=FALSE;
/7Sg/d%c for(int index=0;index<MAX_KEY;index++){
U~yPQ8jD if(hCallWnd[index]==0){
5g-1pzP9 hCallWnd[index]=hWnd;
],!}| HotKey[index]=cKey;
3t9+Y dNKU HotKeyMask[index]=cMask;
ZKt{3P bAdded=TRUE;
B]yO KeyCount++;
-V2`[k break;
.{t5_,P }
jNX6Ct? }
W7|nc,i0\ return bAdded;
_X?_|!;J }
[^a7l$fmi //删除热键
#B?lU"f8q^ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Adiw@q1& {
|qQ6>IZ BOOL bRemoved=FALSE;
'@KH@~OzRS for(int index=0;index<MAX_KEY;index++){
Dj=$Q44 if(hCallWnd[index]==hWnd){
]]r;}$ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
j-/$e, xX hCallWnd[index]=NULL;
uYlyU~M:D HotKey[index]=0;
m=h/A xW HotKeyMask[index]=0;
!sI^Lh,Y bRemoved=TRUE;
jt6_1^ KeyCount--;
1
Lg {l break;
&k*oG:J3 }
= =pQ
V[ }
)g8Kicox5 }
$HOe){G return bRemoved;
Q$p3cepsK }
;8MQ'# )Dhx6xM[a ~FAk4z=Ed DLL中的钩子函数如下:
=YO<.(Lu NoF|j57?u' LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
B)DuikV.D {
nvQX)Xf BOOL bProcessed=FALSE;
R!"`Po if(HC_ACTION==nCode)
um/F:rp {
EFtn!T if((lParam&0xc0000000)==0xc0000000){// 有键松开
3hJ51=_0^ switch(wParam)
M7Xn=jc {
be-HF;lZe' case VK_MENU:
@`B_Q v@ MaskBits&=~ALTBIT;
S/eplz; break;
w
`d9" n case VK_CONTROL:
H0B=X l[ MaskBits&=~CTRLBIT;
{ **W7\h break;
*@@dO_%6 case VK_SHIFT:
"-:g.x*d MaskBits&=~SHIFTBIT;
j)ln"u0R^B break;
"tJ[M default: //judge the key and send message
t}}Ti$$> break;
\O~/^ Y3U! }
#d<"Ub for(int index=0;index<MAX_KEY;index++){
1\lZ&KX$i if(hCallWnd[index]==NULL)
<ir]bQT continue;
By[M|4a if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
5(1c?biP& {
:>ca).cjac SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
b O}&i3.L; bProcessed=TRUE;
+,7vbs3 }
_I,GH{lh I }
l%0-W }
c*<BU6y else if((lParam&0xc000ffff)==1){ //有键按下
"ig)7X+Wz| switch(wParam)
~A%+oa*2~ {
?c"iV case VK_MENU:
^g2Vz4u MaskBits|=ALTBIT;
M'X,7hZ break;
Hv'
OO@z case VK_CONTROL:
+S#Xm4 MaskBits|=CTRLBIT;
XCxxm3t break;
D8*6h)~ case VK_SHIFT:
}=|{"C MaskBits|=SHIFTBIT;
/VEK<.,aMv break;
Y HS/|- default: //judge the key and send message
yZoJD{'?Sw break;
ON>l%Ae4G }
.n.N.e for(int index=0;index<MAX_KEY;index++){
iM1E**WCtv if(hCallWnd[index]==NULL)
g^po$%I ' continue;
:YX5%6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
iN0'/)ar {
:T@} CJ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
)Xt#coagS bProcessed=TRUE;
N3KI6p6 \ }
hhU\$'0B- }
5}5oj37x }
64"DT3: if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
}=gD,]2x8 for(int index=0;index<MAX_KEY;index++){
spQr1hx< if(hCallWnd[index]==NULL)
^)`e}} continue;
2"}Vfy if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
!lZ}kz0 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
IY!8j$'| //lParam的意义可看MSDN中WM_KEYDOWN部分
F]N?_ bo }
\?Xoa"^ }
h^,L) E }
b
o_`P3 return CallNextHookEx( hHook, nCode, wParam, lParam );
-I*vl }
ApggTzh@ >lJTS t5{ 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:
eqOT@~H TB<$9FCHK BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
{7$jwk BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
|,H2ge @a=jSB#B 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:
qrZ3`@C4k d|W=_7z LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
,E%O_:}R {
{C8IYBm if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
pP"j| {
8aM\B%NGWi //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
p*1B*R SaveBmp();
R S>qP;V*- return FALSE;
4OAR ["f }
Pv)^L …… //其它处理及默认处理
3-Xd9ou }
BT3yrq9 &?xtmg<d sS4V(:3s 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。
c|k(_#\B nC?Lz1re 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。
KCp9P2kv. +`$$^x 二、编程步骤
Vvfd?G" *c$UIg 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
3'0Jn6( g2M1zRm; 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
H,7!"!?@N NweGK 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
|]Hr"saO0 QOPh3+.5 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
qM2m ! YuJ{@"H 5、 添加代码,编译运行程序。
~Dw%
d; xwHE,ykE 三、程序代码
Y;E'gP-J *xj2Z,u ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
F,K))325 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
-QBM^L #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
iO18FfM_ #if _MSC_VER > 1000
OJM2t`}_t #pragma once
(Gapv9R #endif // _MSC_VER > 1000
p u?COA #ifndef __AFXWIN_H__
_~P&8 #error include 'stdafx.h' before including this file for PCH
kK:Wr&X0H #endif
7:JGr O #include "resource.h" // main symbols
ip*^eS^ class CHookApp : public CWinApp
*&+zI$u( {
^'+#BPo9@ public:
+Ll29Buyi CHookApp();
\TDn q!)? // Overrides
uGYH4
// ClassWizard generated virtual function overrides
OI6m>XH? //{{AFX_VIRTUAL(CHookApp)
Y$./!lVY public:
^\\9B-MvY virtual BOOL InitInstance();
=`CK`x virtual int ExitInstance();
Yg 2P( //}}AFX_VIRTUAL
K_.|FEV //{{AFX_MSG(CHookApp)
X_Pbbx_j // NOTE - the ClassWizard will add and remove member functions here.
z-sq9Qp&x // DO NOT EDIT what you see in these blocks of generated code !
GyFA1%(o //}}AFX_MSG
Z^WI~B0nt DECLARE_MESSAGE_MAP()
YzEOfHL, };
1C*mR%Q LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
VOg'_#I BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
-?IF'5z BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
*{p:C BOOL InitHotkey();
N6A| BOOL UnInit();
x~D8XN{ #endif
2<'ol65/c :ee vc7 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
R4DfqX #include "stdafx.h"
:RBeq,QaO #include "hook.h"
>Af0S;S #include <windowsx.h>
Z;0<k;#T(p #ifdef _DEBUG
t9lf=+%s #define new DEBUG_NEW
<1_3`t #undef THIS_FILE
-0NkAQrg static char THIS_FILE[] = __FILE__;
[I<J6= #endif
wCj)@3F #define MAX_KEY 100
hwi_=-SL #define CTRLBIT 0x04
9gIim #define ALTBIT 0x02
I@#IXH?6 #define SHIFTBIT 0x01
x7jFYC #pragma data_seg("shareddata")
e9QjRx HHOOK hHook =NULL;
!>kg:xV UINT nHookCount =0;
^.~e static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
ztp2j%' static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Q0ba;KPm static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
3m$Qd#| static int KeyCount =0;
>5Y. static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
+u&3pK>f #pragma data_seg()
<HpUP!q8v HINSTANCE hins;
|=:hUp Jp void VerifyWindow();
w:R#F(
'B BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
E9@Sc>e //{{AFX_MSG_MAP(CHookApp)
%8YUK/(|n // NOTE - the ClassWizard will add and remove mapping macros here.
'cc{sjG // DO NOT EDIT what you see in these blocks of generated code!
OF-g7s6VH //}}AFX_MSG_MAP
`/B+ END_MESSAGE_MAP()
E7/i_Xkk >8$Lqj^i CHookApp::CHookApp()
#n|eq{fkK {
.%M80X{5~ // TODO: add construction code here,
Z4gn7
'V // Place all significant initialization in InitInstance
/`y^z"! }
g\iSc~%? f*p=j(sF CHookApp theApp;
oc[z dIk LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
M.EL^;r {
{V8uk$ BOOL bProcessed=FALSE;
38:5g_ if(HC_ACTION==nCode)
rQ&XHG>Q* {
\#F>R, if((lParam&0xc0000000)==0xc0000000){// Key up
J?hs\nA switch(wParam)
p
)WRsJ8 {
#GUD^#Jh case VK_MENU:
4sC)hAx&f MaskBits&=~ALTBIT;
wb##|XyK<c break;
nAX/u[ case VK_CONTROL:
GBT219Z@8 MaskBits&=~CTRLBIT;
(''w$qq"D break;
7=qvu&{ case VK_SHIFT:
VM;vLUu!e MaskBits&=~SHIFTBIT;
3[ xHY@c break;
/R>YDout} default: //judge the key and send message
^nDa-J$ break;
~4mRm!DP }
Ua~8DdW for(int index=0;index<MAX_KEY;index++){
8~|v:qk if(hCallWnd[index]==NULL)
VAe[x
` continue;
N0 mhgEA if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
D/,(xWaT {
cu)B!#<!& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
z>'vS+axV bProcessed=TRUE;
pkTVQdtRG }
b%d, X-3 }
`v'yGsIV }
lc]cs D else if((lParam&0xc000ffff)==1){ //Key down
7c6-
o"A switch(wParam)
)lJi7 ^, {
]c]^(C case VK_MENU:
3/]~#y%2 MaskBits|=ALTBIT;
_p^Wc.[~M break;
_!w69>Nj case VK_CONTROL:
9Q7342 MaskBits|=CTRLBIT;
Zvra > % break;
u EERNo& case VK_SHIFT:
bHXoZix MaskBits|=SHIFTBIT;
w U1[/ break;
{Eqx'j default: //judge the key and send message
r- Y7wM`TZ break;
+k/=L9#e }
wbg?IvY[ for(int index=0;index<MAX_KEY;index++)
t oM+Bd:Y {
Fr2F&NN`D if(hCallWnd[index]==NULL)
YHxQb$v) continue;
qt4%=E;[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,4;'s {
B$S@xD $ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
.LbAR
u bProcessed=TRUE;
abS3hf }
!JVv`YN }
BH}M]<5 }
tGSXTF}G if(!bProcessed){
*_H]?& for(int index=0;index<MAX_KEY;index++){
][XCpJ)8 if(hCallWnd[index]==NULL)
5@pLGMHT continue;
(CAkzgTfc if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
?D(aky#cyc SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
5'<a,,RKu }
NSq29# }
'a:';hU3f }
O[p c$Pi return CallNextHookEx( hHook, nCode, wParam, lParam );
P:5vS:s? }
'QTa<Z)E Tr;&bX5]H BOOL InitHotkey()
7g%\+%F
I {
nHU}OGzW if(hHook!=NULL){
-<e_^ nHookCount++;
/"^XrVi- return TRUE;
+k0UVZZX? }
6}Rb-\N else
{!! 8 *ix hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
(`R
heEg@f if(hHook!=NULL)
_x$\E nHookCount++;
}FX:sa?5 return (hHook!=NULL);
.B'ws/%5\ }
m/< @Qw BOOL UnInit()
lsgZ {
K@{R?j/+ if(nHookCount>1){
xqauSW nHookCount--;
d ]#`?} return TRUE;
WmRu3O }
c4s,T"H BOOL unhooked = UnhookWindowsHookEx(hHook);
-U\s.FI.AR if(unhooked==TRUE){
$+,kibk*R nHookCount=0;
R3.8Dr0f hHook=NULL;
5,\|XQA5! }
E
5mYFVK return unhooked;
Q9Go}}n }
m6Qm }"" Z|A+\#' BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
2(P<TP._E {
LKZv#b[h BOOL bAdded=FALSE;
-$,'|\Y for(int index=0;index<MAX_KEY;index++){
Owv}lJ if(hCallWnd[index]==0){
WHu[A/##'] hCallWnd[index]=hWnd;
JIf.d($
~: HotKey[index]=cKey;
8x 8nQ*_ HotKeyMask[index]=cMask;
ll?Qg%V[t bAdded=TRUE;
j%':M KeyCount++;
x1"8K break;
N(O*"1b }
N Ff`V }
y(Em+YTD return bAdded;
6=*n$l#} }
xhB-gG= _,f7D/dq BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
/03?(n= 3 {
"Id1H BOOL bRemoved=FALSE;
NS "1zR+ for(int index=0;index<MAX_KEY;index++){
<S12=<c?' if(hCallWnd[index]==hWnd){
DU-dIqi if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
o@L
'|#e hCallWnd[index]=NULL;
(?i4P5s[! HotKey[index]=0;
e488}h6#m HotKeyMask[index]=0;
K
28s<i` bRemoved=TRUE;
(-@I'CFd KeyCount--;
KHM,lj* break;
SPauno <M }
q#"lnc<S }
jY ;Hdb'' }
|;"(C# B return bRemoved;
?uW}
XAi }
Cn_r?1{W M}
+s_h9 void VerifyWindow()
2;w> w#}> {
iT+t for(int i=0;i<MAX_KEY;i++){
lbh7`xCR if(hCallWnd
!=NULL){ /XdLdA!v
if(!IsWindow(hCallWnd)){ &3itBQF
hCallWnd=NULL; ucJ8l(?Qc
HotKey=0; }n
+MVJ;dG
HotKeyMask=0; M[e^Z}w.V
KeyCount--; di<g"8
} +;bZ(_ohG
} 74hRG~
} 6t'.4SR
} -67!u;
3@1$y`SN
BOOL CHookApp::InitInstance() G\(*z4@Gz
{ dki3(
AFX_MANAGE_STATE(AfxGetStaticModuleState()); V|<'o<h8
hins=AfxGetInstanceHandle(); t$lJgj(
InitHotkey(); 3(:?Z-iKe
return CWinApp::InitInstance(); g+xcKfN{
} $-
Y8@bw
X G5"u
int CHookApp::ExitInstance() }}Gkipp
{ '"h}l`
VerifyWindow(); _<?z-K_;I
UnInit(); T^ #1T$
return CWinApp::ExitInstance(); L:.Rv0XT
} {yMkd4v
V8Z@y&ny
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ZbH_h]1$D
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) j_b/66JyN
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Zj0h0Vt
#if _MSC_VER > 1000 7>EMr}f C
#pragma once rAD4}A_w
#endif // _MSC_VER > 1000 ('.I)n
8[a N5M]
class CCaptureDlg : public CDialog Ft_g~]kZo
{ FR\r/+n:t0
// Construction g O8~$Aj
public: #(Yd'qKo
BOOL bTray; i6O'UzD@T
BOOL bRegistered; rY$wC%
BOOL RegisterHotkey(); ppeF,Q
UCHAR cKey; V2g"5nYT
UCHAR cMask; \\Z?v,XsS
void DeleteIcon(); }$* z:E
void AddIcon(); Q_*.1L
UINT nCount; &0{&4,
void SaveBmp(); AR
g]GV/L
CCaptureDlg(CWnd* pParent = NULL); // standard constructor |Vp
?
// Dialog Data `*]r+J2
//{{AFX_DATA(CCaptureDlg) zY].ZS=7
enum { IDD = IDD_CAPTURE_DIALOG }; .mxc~
CComboBox m_Key; %PPkT]~\
BOOL m_bControl; 2Ic)]6z
R
BOOL m_bAlt; CYM>4C~>JW
BOOL m_bShift; e'fo^XQn[
CString m_Path; ?}C8_I|4~
CString m_Number; GxE`z6%[
//}}AFX_DATA q^L"@Q5;
// ClassWizard generated virtual function overrides o ,8;=f,7
//{{AFX_VIRTUAL(CCaptureDlg) +KIBbXF7
public: _9S"rH[
virtual BOOL PreTranslateMessage(MSG* pMsg); -@~4: o
protected: ,<TJh[TzC6
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #.LI`nYA
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Ol;"}3*Z*
//}}AFX_VIRTUAL X& XD2o"rt
// Implementation Q{~;4+ZD
protected: gU?M/i2
HICON m_hIcon; tnq ZlS
// Generated message map functions #=Whh
9-d
//{{AFX_MSG(CCaptureDlg) =n;LP#(h ?
virtual BOOL OnInitDialog(); $4]4G=o
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); +5%ncSJx
afx_msg void OnPaint(); <B+
WM
afx_msg HCURSOR OnQueryDragIcon(); ;U? 323Z
virtual void OnCancel(); rgEN~e'
afx_msg void OnAbout(); -JclEp
afx_msg void OnBrowse(); )?(_vrc<
afx_msg void OnChange(); SN$3cg]z
//}}AFX_MSG ,5x9o"N!
DECLARE_MESSAGE_MAP() R,-DP/ (im
}; <4I`|D3@
#endif E:P_CDSd]
"a<:fEsSE
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C~M,N|m+^
#include "stdafx.h" qI[AsM+
#include "Capture.h" ^vI`#}?
#include "CaptureDlg.h" w=~X 6[+3
#include <windowsx.h> /5Yl, P
#pragma comment(lib,"hook.lib") 2TQ<XHA\
#ifdef _DEBUG LfvRH?<W
#define new DEBUG_NEW `U>]*D68
#undef THIS_FILE -8SZ}J
static char THIS_FILE[] = __FILE__; hKems3
#endif <V|\yH9
#define IDM_SHELL WM_USER+1 }'uV{$
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ];u nR<H
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _A=i2?g
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; {k']nI.>
class CAboutDlg : public CDialog (Y"./BDY
{ p<B*)1Tj0
public: D% 2S!
CAboutDlg(); 1W7ClT_cQ
// Dialog Data JRDIGS_~
//{{AFX_DATA(CAboutDlg) FyV $`c$
enum { IDD = IDD_ABOUTBOX }; GvL\%0Ibx
//}}AFX_DATA p)~EG=p
// ClassWizard generated virtual function overrides PE6ZzxR|U<
//{{AFX_VIRTUAL(CAboutDlg) x.
/WP~I
protected: {=+'3p
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :=K+~?
//}}AFX_VIRTUAL gbu)bqu2x
// Implementation mqiCn]8G
protected: =ibKdPtTh^
//{{AFX_MSG(CAboutDlg) Q6CVMYT
//}}AFX_MSG mC'<Ov<eJ
DECLARE_MESSAGE_MAP() v/,,z+%-
}; "[CR5q9Pr
n9k-OGJ
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) [`1@`5SL-
{ \CYKj_c
//{{AFX_DATA_INIT(CAboutDlg) &p55Cg@e)
//}}AFX_DATA_INIT > v4+@o[~
} L(HAAqRnJ
5$*=;ls>J
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
~vMJ?P@
{ zSBR_N51
CDialog::DoDataExchange(pDX); RZ?abE8
//{{AFX_DATA_MAP(CAboutDlg) =V:Al
//}}AFX_DATA_MAP <{z-<D;
} N\fj[?f[
Wyb+K)Tg
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1CS\1[E
//{{AFX_MSG_MAP(CAboutDlg) i8=+<d
// No message handlers <qBM+m$|)
//}}AFX_MSG_MAP xqv&^,ic
END_MESSAGE_MAP() W O'nW
QF$s([
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) c']m5q39'
: CDialog(CCaptureDlg::IDD, pParent) :{aiw?1
{ -CTLQyj)
//{{AFX_DATA_INIT(CCaptureDlg) $]J<^{v
m_bControl = FALSE;
wKbU}29c
m_bAlt = FALSE; 8,)<,g-/=
m_bShift = FALSE; CZkmd
m_Path = _T("c:\\"); kXOc)
m_Number = _T("0 picture captured."); lXutZ<S[
nCount=0; M'@
bRegistered=FALSE; 4!-/m7%eF
bTray=FALSE; /LLo7"
//}}AFX_DATA_INIT $@~sO0q
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
L$@qEsO
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9x#Tj/5%
} ZSLvr-,D
*EFuK8 ;
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) p uW
{
4G j
CDialog::DoDataExchange(pDX); Fh}GJE
//{{AFX_DATA_MAP(CCaptureDlg) !_-Uwg
DDX_Control(pDX, IDC_KEY, m_Key); QvlVjDIy
DDX_Check(pDX, IDC_CONTROL, m_bControl); #`%V/ #YK
DDX_Check(pDX, IDC_ALT, m_bAlt); JHJ]BMm
DDX_Check(pDX, IDC_SHIFT, m_bShift); 3.h0
DDX_Text(pDX, IDC_PATH, m_Path); m ~gc c
DDX_Text(pDX, IDC_NUMBER, m_Number); _CizU0S
//}}AFX_DATA_MAP nd{k
D>a
} )k81
OZ&SxR%q4
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .lGN
Fx
//{{AFX_MSG_MAP(CCaptureDlg) D4T(Dce
ON_WM_SYSCOMMAND() 4
i`FSO
ON_WM_PAINT() .qCI!%fg
ON_WM_QUERYDRAGICON() 8`Tj *7Y=
ON_BN_CLICKED(ID_ABOUT, OnAbout) ksyQ_4^SO
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) pV$A?b"?*
ON_BN_CLICKED(ID_CHANGE, OnChange) 7s0pH+
//}}AFX_MSG_MAP )g ?'Nz
END_MESSAGE_MAP() tYx>?~
)Dyyb1\)
BOOL CCaptureDlg::OnInitDialog() UryHte
{ f;bVzti+w
CDialog::OnInitDialog(); `_OB_F
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 4XSq\.@G
ASSERT(IDM_ABOUTBOX < 0xF000); eRg;)[#0>$
CMenu* pSysMenu = GetSystemMenu(FALSE);
>j&k:
if (pSysMenu != NULL) Mz;KXP
{ k>:\4uI|<\
CString strAboutMenu; m>!aI?g
strAboutMenu.LoadString(IDS_ABOUTBOX); ,E2c9V'
if (!strAboutMenu.IsEmpty()) soA] f
{ zG<>-?q~'
pSysMenu->AppendMenu(MF_SEPARATOR); b6@0?_n
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %z-n2%
} w=[ITQ|W%
} {&nDm$KTD
SetIcon(m_hIcon, TRUE); // Set big icon QM{B(zH
SetIcon(m_hIcon, FALSE); // Set small icon (w
Q,($@
m_Key.SetCurSel(0); ^j2z\yo
RegisterHotkey(); H:mcex
CMenu* pMenu=GetSystemMenu(FALSE); Li\b,_C
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); jOL=vG
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); lN_b&92
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \\Nt^j3qR
return TRUE; // return TRUE unless you set the focus to a control 0RN 7hpf&`
} J5}?<Dd:
Z*.rv t
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Q>TNzh
{ jV#1d8qm
if ((nID & 0xFFF0) == IDM_ABOUTBOX) R xc
{ G9CL}=lJ,
CAboutDlg dlgAbout; J!yK/*sO,
dlgAbout.DoModal(); M[L@ej
} Z.N9e
else h@Ix9!?+
{ WmE4TL^8?
CDialog::OnSysCommand(nID, lParam); U :8cz=#
} <SRo2rjRa
} ZpZoOdjslV
J,k.*t:
void CCaptureDlg::OnPaint() #_zj5B38E
{ 'r}y{`3M
if (IsIconic())
hAD gi^
{ \M~uNWv|
CPaintDC dc(this); // device context for painting %< Jj[F
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )b,FE}YX
// Center icon in client rectangle Cm-dos
int cxIcon = GetSystemMetrics(SM_CXICON); 'i 8`LPQ
int cyIcon = GetSystemMetrics(SM_CYICON); TIn o"tc3
CRect rect; )~#3A@
GetClientRect(&rect); 5E2T*EXSh
int x = (rect.Width() - cxIcon + 1) / 2; I3 YSW
int y = (rect.Height() - cyIcon + 1) / 2; \$,8aRT>#U
// Draw the icon +<WNAmh
dc.DrawIcon(x, y, m_hIcon); `r0MQkk
} S*H
@`Do%d
else {-yw@Kq
{ b3q&CJ4|
CDialog::OnPaint(); v5*JBW+c*
} t5EYu*
} `bZgw
8aW<lu
HCURSOR CCaptureDlg::OnQueryDragIcon() vP,$S^7$
{ JC7:0A^
return (HCURSOR) m_hIcon; y.::d9v
} ex|h&Vma2V
FMC]KXSd
void CCaptureDlg::OnCancel() 5PE}3he:
{ @[]#[7
if(bTray) n{"a0O
DeleteIcon(); RHmT$^=
CDialog::OnCancel(); `?SLp
} BxesoB
6Z{(.'Be
void CCaptureDlg::OnAbout() M} Mgz
{ *Z3b6X'e
CAboutDlg dlg; ~g*5."-i
dlg.DoModal(); }`]Et99Q5
} 5)ooE
dHtEyF
void CCaptureDlg::OnBrowse() >*$Xbj*
{ =|H.r9-PK6
CString str; WpC9(AX5g
BROWSEINFO bi; iK8jX?
char name[MAX_PATH]; G}@a]EGm
ZeroMemory(&bi,sizeof(BROWSEINFO)); -f"{%<Q
bi.hwndOwner=GetSafeHwnd(); /?*ut&hwv
bi.pszDisplayName=name; &a'LOq+r'
bi.lpszTitle="Select folder"; ,vuC0{C^
bi.ulFlags=BIF_RETURNONLYFSDIRS; j k&\{
LPITEMIDLIST idl=SHBrowseForFolder(&bi); e /L([
if(idl==NULL) HP:[aR!2P
return; AL|3_+G
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); D{JwZL@7k2
str.ReleaseBuffer(); C4gzg
m_Path=str; ~Jlq.S'
if(str.GetAt(str.GetLength()-1)!='\\') =:\5*
m_Path+="\\"; SA?1*dw)
UpdateData(FALSE); =D)ADZ\<r
} T2|os{U
T/jxsIt3
void CCaptureDlg::SaveBmp() y8dOx=c
{ wqgKs=y
CDC dc; o 9d|XY_
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ~iq=J5IN#
CBitmap bm; DkW^gt
int Width=GetSystemMetrics(SM_CXSCREEN); \+k~p:d_8
int Height=GetSystemMetrics(SM_CYSCREEN); vILgM\or
bm.CreateCompatibleBitmap(&dc,Width,Height); )-25?B
CDC tdc; `tl -] ^Y2
tdc.CreateCompatibleDC(&dc); fP
llN8n
CBitmap*pOld=tdc.SelectObject(&bm); p:3w8#)MZ
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); wcGv#J],
tdc.SelectObject(pOld); n/YnISt
BITMAP btm; ulfs Z:
bm.GetBitmap(&btm);
#p-\Y7f
DWORD size=btm.bmWidthBytes*btm.bmHeight; *pyC<4W
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ?5wsgP^
BITMAPINFOHEADER bih; .p(r|5(b
bih.biBitCount=btm.bmBitsPixel; WZ UeW*#=
bih.biClrImportant=0; oslj<
bih.biClrUsed=0; nIqF:6/
bih.biCompression=0; im
F,8 '
bih.biHeight=btm.bmHeight; 6rlvSdB
bih.biPlanes=1; ]hZk#rp}
bih.biSize=sizeof(BITMAPINFOHEADER); GK#D R/OM
bih.biSizeImage=size; D[{"]=-
bih.biWidth=btm.bmWidth; VREDVLQT
bih.biXPelsPerMeter=0; 8#HQ05q>
bih.biYPelsPerMeter=0; 0f9U:)1z
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <}F(G-kV6
static int filecount=0; )M8@|~~
CString name; ,Bj]j -\Y
name.Format("pict%04d.bmp",filecount++); vgi`.hk
name=m_Path+name; .I%B$eH
BITMAPFILEHEADER bfh; f4vdJ5pV
bfh.bfReserved1=bfh.bfReserved2=0; Hro)m"
bfh.bfType=((WORD)('M'<< 8)|'B'); BRv#`
bfh.bfSize=54+size; CjJ n
bfh.bfOffBits=54; Sp]ov:]%f
CFile bf; Y@+9Ukd/
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ [YJ*zO
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); m/`L3@7Tt
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); <"av /`;
bf.WriteHuge(lpData,size); @.pr}S/
bf.Close(); 4I2#L+W
nCount++; r>G||/Z
} Zt
1nH
GlobalFreePtr(lpData); H7f
Xg
if(nCount==1) wV,=hMTd&\
m_Number.Format("%d picture captured.",nCount); qJw\<7m
else 2FGCf} ,
m_Number.Format("%d pictures captured.",nCount); ?i}wm`
UpdateData(FALSE); 2~hQ
} s:I 8~Cc
JC}T*h>Ee
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 6mjD@
{ CS0q#?
if(pMsg -> message == WM_KEYDOWN) 5'_:>0}
{ kqGydGh*"
if(pMsg -> wParam == VK_ESCAPE) u3sr"w&
return TRUE; |V^f}5gd
if(pMsg -> wParam == VK_RETURN) l I2UpfkBP
return TRUE; l>)+HoD
} %m$t'?
return CDialog::PreTranslateMessage(pMsg); 2
S2;LB
} |WW'qg]Uu
OOYdrv,
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Vc+~yh.)
{ ,,-j5Y
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ M->#WGl\B
SaveBmp(); f|2QI~R
return FALSE; ~O
4@b/!4
} 3w! NTvp
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ z'0
=3
CMenu pop; S(: |S(
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Az/P;C=
CMenu*pMenu=pop.GetSubMenu(0); [ *
!0DW`
pMenu->SetDefaultItem(ID_EXITICON); <<H'Z
CPoint pt; H-8_&E?6m
GetCursorPos(&pt); Htep3Ol3
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1h`# H:
if(id==ID_EXITICON) 5e2yJ R
DeleteIcon(); )7Oj
else if(id==ID_EXIT) Z*'_/Grv?
OnCancel(); z0T6a15f!P
return FALSE; qnO/4\qq
} %t$)sg]
LRESULT res= CDialog::WindowProc(message, wParam, lParam); #:Ukv?
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {3 >`k.w
AddIcon(); ,fj~BkW{
return res; T? ,Q=.
} 3)XS^WG
ca%XA|_J
void CCaptureDlg::AddIcon() EDg; s-T=
{ ,|w,
NOTIFYICONDATA data; Wr,pm#gl6
data.cbSize=sizeof(NOTIFYICONDATA); Qk&6Z%
CString tip; &]c7<=`K"
tip.LoadString(IDS_ICONTIP); )XYCr<s2"
data.hIcon=GetIcon(0); /1r{z1pv\
data.hWnd=GetSafeHwnd(); l
Ng)k1
strcpy(data.szTip,tip); iF1zLI<A
data.uCallbackMessage=IDM_SHELL; RMAbu*D0
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; )(yKm/50
data.uID=98; ]Yf8
Shell_NotifyIcon(NIM_ADD,&data); mQ\oR|
ShowWindow(SW_HIDE); TaZlfe5z
bTray=TRUE; r6kQMFA
} N
Q}5'
+lJD7=%K]Z
void CCaptureDlg::DeleteIcon() DMT2~mh
{ 5gwEr170
NOTIFYICONDATA data; ShOB"J-
data.cbSize=sizeof(NOTIFYICONDATA); %i&\X[
data.hWnd=GetSafeHwnd(); P}-S[[b73s
data.uID=98; :Y)G- :S+
Shell_NotifyIcon(NIM_DELETE,&data); 3;Tsjv}
ShowWindow(SW_SHOW); 3.%jet1
SetForegroundWindow(); PH!rWR
ShowWindow(SW_SHOWNORMAL); wT:mfS09N
bTray=FALSE; ]kH8T'
} (-{.T
6Q`7>l.|?
void CCaptureDlg::OnChange() 9A}nZ1Y
{ 83Fmu/(
RegisterHotkey(); d^`n/"Ice
} ;5}"2hU>
r4 ;nkx
BOOL CCaptureDlg::RegisterHotkey() Chtls;Ph[
{ ET|4a(x
UpdateData(); NaeG)u#+
UCHAR mask=0; S?Uvt?
UCHAR key=0; JwUz4
if(m_bControl) smX&B,&@
mask|=4; 7] 17?s]t,
if(m_bAlt) WQHlf0]
mask|=2; m_UzmWF
if(m_bShift) &-|(q!jm
mask|=1; Gdlx0i
key=Key_Table[m_Key.GetCurSel()]; r
D|Bj(X8
if(bRegistered){ AaJz3oncJ
DeleteHotkey(GetSafeHwnd(),cKey,cMask); OWmI$_L
bRegistered=FALSE; 0f,Ii_k bT
} \Qz
cMask=mask; @FuX^Q.[
cKey=key; </qli-fXB}
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); J8hH#7WMS
return bRegistered; 1@Rl^ey
} !^w}Sp
}vQY+O
四、小结 R<ZyP~
HuajdC~
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。