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:
rjUBLY1(
;,XyN+2H 一、实现方法
)TU<:V #~k[ 6YR 0 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{hs(8%R t`5j4bdG #pragma data_seg("shareddata")
l~J*' m2 HHOOK hHook =NULL; //钩子句柄
SfW}"#L>5 UINT nHookCount =0; //挂接的程序数目
\}JrFc%O static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
s+,&|;Q static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
q8xd*--# static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
.!RavEg+ static int KeyCount =0;
uZIJoT static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
_KN/@(+F #pragma data_seg()
?NG=8.p i#W*' 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。
r_U>VT^E: 8IGt4UF&? 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:
xWE8Wm dMvp&M\\' BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
3o6RbW0[
cKey,UCHAR cMask)
h*w6/ZL1 {
i sW\MB] BOOL bAdded=FALSE;
>7b)y for(int index=0;index<MAX_KEY;index++){
CQ^3v09N;~ if(hCallWnd[index]==0){
*1A&'T2 hCallWnd[index]=hWnd;
\+nGOvM HotKey[index]=cKey;
/ty?<24ko HotKeyMask[index]=cMask;
M#,Q
^rH# bAdded=TRUE;
}Qr6l/2 KeyCount++;
'bu )M1OLi break;
W5pb;74| }
#E$X,[ZFo }
qlsQ|/'D return bAdded;
1;lmu]I>) }
L}%dCe //删除热键
bw4oLu? BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+?m0Q;%b {
H(-4:BD? BOOL bRemoved=FALSE;
'#\1uXM1U? for(int index=0;index<MAX_KEY;index++){
9$1)k;ChP/ if(hCallWnd[index]==hWnd){
TgfrI
if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
iwF9[wAft hCallWnd[index]=NULL;
OCV+h' HotKey[index]=0;
Y[
zZw~yx HotKeyMask[index]=0;
K#mOSY;} bRemoved=TRUE;
pyZ9OA!PD KeyCount--;
_\8qwDg"#e break;
p(JlvJjo }
7 sFz?`- }
Di5(9]o2 }
)3A{GZj#6 return bRemoved;
Pm{*.AW1 }
X/0v'N )?aaBaN$ ?]O7Ao DLL中的钩子函数如下:
0CExY9@Wq g);^NAA LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
"3CJUr:Q {
Wp0
Dq( BOOL bProcessed=FALSE;
Iah[j,]r if(HC_ACTION==nCode)
b=;nm#cAI {
M8&}j if((lParam&0xc0000000)==0xc0000000){// 有键松开
4Xj4|Rw% switch(wParam)
#qBr/+b {
XMIbUbUk- case VK_MENU:
|N /G'>TS MaskBits&=~ALTBIT;
23\RJpKb break;
V$`Gwr]|n case VK_CONTROL:
?~e3&ux MaskBits&=~CTRLBIT;
b*kfWG-6t break;
(!L5-8O case VK_SHIFT:
.Pndx%X9s MaskBits&=~SHIFTBIT;
fV>CZ^=G break;
xw5d|20b default: //judge the key and send message
Uz7oL8 break;
?%tMohL }
Dim>
7Wbh for(int index=0;index<MAX_KEY;index++){
-Apc$0ZsN if(hCallWnd[index]==NULL)
uN*KHE+h continue;
sic"pn],U if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
gV;H6" {
Vv.r8IGYm SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
!|hoYU>@2L bProcessed=TRUE;
`4?~nbz }
}Db[ 4 }
p9!"O }
x&sI=5l else if((lParam&0xc000ffff)==1){ //有键按下
*D}0[|O switch(wParam)
`>Tu|3%\ {
\W5O&G-C case VK_MENU:
{PP9$>4`l MaskBits|=ALTBIT;
.T<=z break;
O|IG_RL] case VK_CONTROL:
{Bs~lC$ MaskBits|=CTRLBIT;
^ 2GHe<Y break;
$4kH3+WJ case VK_SHIFT:
aimarU MaskBits|=SHIFTBIT;
'VyM{:8 break;
{R<Ea
@LV+ default: //judge the key and send message
- O98pi break;
x5`br.b }
G'2#9<c* for(int index=0;index<MAX_KEY;index++){
g6@Fp7T if(hCallWnd[index]==NULL)
EF7+ *Q9 continue;
^H{R+} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
o./.Q9e7 {
<9E0iz+j SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
0]KraLu"N bProcessed=TRUE;
qf@q]wtar }
n~"$^Vr }
Q?ahr~qo }
1wzqGmjmt if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
fx=Awba for(int index=0;index<MAX_KEY;index++){
0N[&3Ee8 if(hCallWnd[index]==NULL)
~7~~S*EQ continue;
\P} p5k[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
hT$~ygQ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
h~&gIub //lParam的意义可看MSDN中WM_KEYDOWN部分
LTNj| u }
0q>P~]Ow }
3czeTj }
j?y LDLj return CallNextHookEx( hHook, nCode, wParam, lParam );
*D o/+[Ae }
EXP%Mk/ s2?T5oWU 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
)1N 54FNO sK{l 9 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
L;gO;vO BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
4&8Gr0C ]k9)G* 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
SH*C" +!QJTn"3 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
"UEv&mQ {
`:P
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
iXyO(w4D {
5H=ko8fZ= //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
J]m{b09F SaveBmp();
[M.f-x: return FALSE;
W@yJAQ }
USFDy …… //其它处理及默认处理
&1+X\c+tb }
+?p.?I 4iW'kuK XU+<?%u}z 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
>^Se'SE] ;<UW A. 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
D;UV&.$'v V([~r, 二、编程步骤
Wrr cx( ?<G]&EK~~] 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";
2e$w?W0^ K}6dg< 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
"t^URp3 DGevE~ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
a0Ik`8^` @ym/27cRE 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
Oy 2+b1{ Bi@&nAhn@ 5、 添加代码,编译运行程序。
bzdb|I6Z :ss,Hl 三、程序代码
/r12h| K|DWu8 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
b)9'bJRvU #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
7LO%#No", #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
?<6CFH] #if _MSC_VER > 1000
N)&4Hy #pragma once
" R8KQj #endif // _MSC_VER > 1000
w
'3#&k+ #ifndef __AFXWIN_H__
M-i_#EWP #error include 'stdafx.h' before including this file for PCH
)[1)$-Ru #endif
WD'#5]#Y #include "resource.h" // main symbols
7Sz?S_N/j class CHookApp : public CWinApp
<cA/<3k) {
>Z1q j> public:
v\`9;QV5 CHookApp();
y>*xVK{D // Overrides
M>M`baM1 // ClassWizard generated virtual function overrides
W+*5"h //{{AFX_VIRTUAL(CHookApp)
s}pIk.4ot! public:
KFa_ virtual BOOL InitInstance();
1Z{ZV.! virtual int ExitInstance();
?YeWH
WM //}}AFX_VIRTUAL
5wUUx# //{{AFX_MSG(CHookApp)
vP+@z-O // NOTE - the ClassWizard will add and remove member functions here.
%r4q8- // DO NOT EDIT what you see in these blocks of generated code !
KRjV}\} //}}AFX_MSG
LHJ":^ DECLARE_MESSAGE_MAP()
r[?1 };
udeoW-_ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
WoxwEi1~0 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
D/h/Y) Y BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
h5yzwj:C? BOOL InitHotkey();
4[r/}/iGo BOOL UnInit();
y*MF&mQ[ #endif
#2iD'>bQ f-nz{U //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
)/t?!T.[ #include "stdafx.h"
gl).cIp w #include "hook.h"
eSW{Cb #include <windowsx.h>
k<+0o)) #ifdef _DEBUG
_w*}\~`=^ #define new DEBUG_NEW
L],f3< #undef THIS_FILE
@]bPVG?d static char THIS_FILE[] = __FILE__;
^*\XgX #endif
2c?qV #define MAX_KEY 100
LSQz"Ll
l #define CTRLBIT 0x04
UJs$q\#RO #define ALTBIT 0x02
U.{l;EL:T #define SHIFTBIT 0x01
<LRey%{q #pragma data_seg("shareddata")
)!tK[K?5 HHOOK hHook =NULL;
aTBR|US UINT nHookCount =0;
Su 5>$ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
](F#`zUQ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
0kDK~iT static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
MQ)L:R`L static int KeyCount =0;
DQwGUF'( static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
N$[$;Fm: #pragma data_seg()
7H>@iI"? HINSTANCE hins;
KsrjdJx, ' void VerifyWindow();
NzKUtwnIz BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
exdx\@72 //{{AFX_MSG_MAP(CHookApp)
Vb
qto|X@ // NOTE - the ClassWizard will add and remove mapping macros here.
,7XtH>2s // DO NOT EDIT what you see in these blocks of generated code!
'Peni1_ //}}AFX_MSG_MAP
>%E([:$A END_MESSAGE_MAP()
_Jv
9F8v 5d@t7[] CHookApp::CHookApp()
ASPy {
LI)!4(WH // TODO: add construction code here,
lnGq :- // Place all significant initialization in InitInstance
m*X[ Jtr }
0q\7C[R_ -CH`> CHookApp theApp;
A8A~!2V LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
ny-7P;->8 {
a^5^gId5l! BOOL bProcessed=FALSE;
E2L(wt}^ if(HC_ACTION==nCode)
e4FM} z[ {
B^D(5 if((lParam&0xc0000000)==0xc0000000){// Key up
?[x49Ux,P switch(wParam)
)5fQ$<(Z {
P'MY[&|mM' case VK_MENU:
6mH/ m& MaskBits&=~ALTBIT;
2FD=lR?6 break;
aAu>Tn86D. case VK_CONTROL:
H;aYiy MaskBits&=~CTRLBIT;
}6 5s'JB break;
@5)
8L/[l case VK_SHIFT:
v6\F
Q9|t MaskBits&=~SHIFTBIT;
wiX ~D
break;
>ds%].$-\ default: //judge the key and send message
@xsCXCRWVV break;
I &* _,d }
PN+G:Qv for(int index=0;index<MAX_KEY;index++){
#<( = }? if(hCallWnd[index]==NULL)
<ktzT&A continue;
>Q,zNs if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Pag63njg? {
+D#Z n!P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
R6 XuA(5 bProcessed=TRUE;
}_QKJw6/" }
~#\i!I;RY} }
4\.V }
!S%6Uzsj else if((lParam&0xc000ffff)==1){ //Key down
weMww,: ^[ switch(wParam)
Vv$HR {
04!(okubyp case VK_MENU:
q^rl) MaskBits|=ALTBIT;
l6[lJ0Y break;
1gO2C$ case VK_CONTROL:
Q Z8QQ`*S MaskBits|=CTRLBIT;
,G^[o,hS break;
}wSi~^* case VK_SHIFT:
+w|9x.&W MaskBits|=SHIFTBIT;
`P+(&taT break;
FDFH,J`_ default: //judge the key and send message
z1 i &Ge break;
.V6-(d }
F)$K for(int index=0;index<MAX_KEY;index++)
[AEBF2OIv {
:&'{mJW*{t if(hCallWnd[index]==NULL)
@D`zKYwX1 continue;
PM$Ee #62R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
z}}]jR\y? {
j_?cpm{~ml SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
P2n2Qt2 bProcessed=TRUE;
BH0!6Oq }
bm&87 }
;Hm'6TR! }
KiLvI,9y if(!bProcessed){
\9)[#Ld for(int index=0;index<MAX_KEY;index++){
oL/o*^ if(hCallWnd[index]==NULL)
MBk"KF continue;
E(+T* if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
<l\N|+7R SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
dhRJg"vrQ }
P`s(kIe }
^[h2% c$ }
}IUP5O6 return CallNextHookEx( hHook, nCode, wParam, lParam );
w`yx=i# }
<D /a l9 J;~|ph BOOL InitHotkey()
$CtCOwKZ {
-oBI+v& if(hHook!=NULL){
`]2@_wa nHookCount++;
#!!AbuhzK{ return TRUE;
&R]pw`mTH }
Y4~vC[$x' else
R $b,h hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
":WYcaSi if(hHook!=NULL)
Md(JIlh3 nHookCount++;
l[n@/%2 return (hHook!=NULL);
=mrY/:V }
9$tl00 BOOL UnInit()
AF#_nK)@ {
;bHfn-X if(nHookCount>1){
SfI*bJo>V nHookCount--;
?M&4pO&Y return TRUE;
Md9l+[@ }
nTZ> |R) BOOL unhooked = UnhookWindowsHookEx(hHook);
(DJvi6\H if(unhooked==TRUE){
RebTg1vGu nHookCount=0;
z}5<$K_U hHook=NULL;
IhW7^(p\ }
g37q/nEv return unhooked;
.w'vD/q; }
iPU% /_> /_OOPt=G BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
qyv"Wb6+ {
W(k:Pl# BOOL bAdded=FALSE;
X(GV6mJ4 for(int index=0;index<MAX_KEY;index++){
Xu]h$%W if(hCallWnd[index]==0){
"|4jPza hCallWnd[index]=hWnd;
_W9&J&l0so HotKey[index]=cKey;
lwsbm D HotKeyMask[index]=cMask;
qz:]-A bAdded=TRUE;
=h\E<dw KeyCount++;
vXubY@k2 break;
t{ H1u }
v |ifI }
!QTPWA return bAdded;
6^ik|k| }
no3Z\@% J9a $AU* BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
lM&UFEl-\ {
t&pGQ BOOL bRemoved=FALSE;
(fd[P|G_] for(int index=0;index<MAX_KEY;index++){
6H6Law!) if(hCallWnd[index]==hWnd){
#01/(:7 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
`$Kes;[X hCallWnd[index]=NULL;
cKpQr7]ur HotKey[index]=0;
! OfO:L7- HotKeyMask[index]=0;
;*`_#Rn# bRemoved=TRUE;
V g6S/- KeyCount--;
~*kK4]lP break;
R_9 o!sTZ }
5*XH6g F }
PHl4 vh#E! }
]0YDb~UB return bRemoved;
(-'PD_| }
/'"R Mq (ic@3:xR void VerifyWindow()
7H?!RYrx {
X_!$Pk7ma for(int i=0;i<MAX_KEY;i++){
D0KELAcY if(hCallWnd
!=NULL){ |QMT
A5
if(!IsWindow(hCallWnd)){ YZ{;%&rB
hCallWnd=NULL; 5 Af?Yxv
HotKey=0; Ss+F9J
HotKeyMask=0; sHF%=Vu
KeyCount--; R1~7F{FW
} cY^Y!.,
} b2W; |
} %27G 2^1
} E~qK&7+
:g/{(#E@Z
BOOL CHookApp::InitInstance() h4h d<,
{ !Am
=v=>
AFX_MANAGE_STATE(AfxGetStaticModuleState()); R<t&F\>
hins=AfxGetInstanceHandle(); hPS/CgLq
InitHotkey(); P0Aas)!
return CWinApp::InitInstance(); r"6lLc
} ={OCa1
pM,#wYL
int CHookApp::ExitInstance() ]KzJ u`O%G
{ B piEAwh
VerifyWindow(); nWd:>Ur
UnInit(); ~LSy7$rz
return CWinApp::ExitInstance(); `yy%<&
} \?[O,A
x={kjym L
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file e-1;dX HL
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) zCyR<as7
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ tYF$#Nor#k
#if _MSC_VER > 1000 T$f:[ye]Z
#pragma once IwOfZuS
#endif // _MSC_VER > 1000 '! #On/
E`U&Z
class CCaptureDlg : public CDialog 6Uch0xha!
{ 5Gc_LI&v7
// Construction &`-_)~5]
public: (q0No26;(
BOOL bTray; 4,o
%e,z
BOOL bRegistered; }3LBbG0Bw
BOOL RegisterHotkey(); JvT%R`i
UCHAR cKey; lK_
~d_f
UCHAR cMask; jo]m12ps
void DeleteIcon(); @#'yPV1
void AddIcon(); D:+)uX}MOf
UINT nCount; x;<oaT$X
void SaveBmp();
MYKs??]Y1
CCaptureDlg(CWnd* pParent = NULL); // standard constructor c8H9_6
// Dialog Data 7g {g}
//{{AFX_DATA(CCaptureDlg) mrw]yu;2<n
enum { IDD = IDD_CAPTURE_DIALOG }; B:B0p+$I
CComboBox m_Key; \H},ouU
BOOL m_bControl; uZo]8mV
BOOL m_bAlt; yd\5Z[iEp
BOOL m_bShift; [1t\|v
CString m_Path; 3RBpbTNWp
CString m_Number; /F\>Z]
//}}AFX_DATA 0[_O+u
// ClassWizard generated virtual function overrides HQ ELK
//{{AFX_VIRTUAL(CCaptureDlg) ,+swH;=7#r
public: 0(Yh~{
virtual BOOL PreTranslateMessage(MSG* pMsg); 8#NIs@DJ
protected: g6x/f<2x
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support h0'8NvalQ
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?GaI6?lbn
//}}AFX_VIRTUAL G~b`O20N
// Implementation 3:l: ~Vn
protected: u K+9gTv
HICON m_hIcon; #`fi2K&]j
// Generated message map functions ze#rYN vo/
//{{AFX_MSG(CCaptureDlg) 1Xk{(G<\
virtual BOOL OnInitDialog(); }.fZy&_
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =%:n0S0C"
afx_msg void OnPaint(); Gd]5xl
HRU
afx_msg HCURSOR OnQueryDragIcon(); (9WL+S
virtual void OnCancel(); hlSB7D"d
afx_msg void OnAbout(); W>aQ
tT
afx_msg void OnBrowse(); % 8rr*l5
afx_msg void OnChange(); E< io^
//}}AFX_MSG kx;xO>dC
DECLARE_MESSAGE_MAP() 0XBBA0tq
}; 02]8|B(E90
#endif .P|+oYT&g
k8Su/U
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 8M".o n
#include "stdafx.h" "G i+zkVm
#include "Capture.h" H`+]dXLB
#include "CaptureDlg.h" B J:E,P`_
#include <windowsx.h> A$H+4L
#pragma comment(lib,"hook.lib") /Gh
x2B
#ifdef _DEBUG ZYl-p]\*y
#define new DEBUG_NEW cAsSN.HFS
#undef THIS_FILE YKs^%GO+
static char THIS_FILE[] = __FILE__; uJ)\P
#endif j:de}!wc
#define IDM_SHELL WM_USER+1 <.?^LT
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dcrJ,>i}
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kcma/d
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 's7 SZ$(
class CAboutDlg : public CDialog {=pP`HD0
{ 6a 2w-}Fs
public: ^,ZvKA"}+/
CAboutDlg(); CwH)6uA
// Dialog Data E``!-W
//{{AFX_DATA(CAboutDlg) VQG /g\
enum { IDD = IDD_ABOUTBOX }; ^~YmLI4
//}}AFX_DATA 4/mj"PBKL
// ClassWizard generated virtual function overrides 2jrX
//{{AFX_VIRTUAL(CAboutDlg) rt\<nwc
protected: Tg{dIh.Q~O
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #IL~0t
//}}AFX_VIRTUAL wzLiVe-
// Implementation dTU.XgX)1^
protected: *fuGVA
//{{AFX_MSG(CAboutDlg) A]~i uUHm
//}}AFX_MSG @]VvqCk
DECLARE_MESSAGE_MAP() +2k|g2
}; 40l#'< y;
!~$ YD*"S
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ke;*uS
{ )lngef
/D_
//{{AFX_DATA_INIT(CAboutDlg) Ph7(JV{
//}}AFX_DATA_INIT ?`[ uh%
} /iJcy:J
#9W5
void CAboutDlg::DoDataExchange(CDataExchange* pDX) * v7& T
{ [0,q7d?"
CDialog::DoDataExchange(pDX); 7gR;
//{{AFX_DATA_MAP(CAboutDlg) dO4U9{+
//}}AFX_DATA_MAP S;AnpiBM8
} E*!zJ,@8
A](}"Pi!n
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) oe_[h]Hgl
//{{AFX_MSG_MAP(CAboutDlg) 2"{]A;@
// No message handlers :Ro"
0/d
//}}AFX_MSG_MAP wGQ hr="
END_MESSAGE_MAP() Uub%s`O
KlX |PQ
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) : z,vJ~PW
: CDialog(CCaptureDlg::IDD, pParent) /Geks/
{ =x.v*W]F`
//{{AFX_DATA_INIT(CCaptureDlg) (9[C0e S
m_bControl = FALSE; '8pPGh9D
m_bAlt = FALSE;
s?\9i6
m_bShift = FALSE; v.^
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m_Path = _T("c:\\"); #/sE{jm
m_Number = _T("0 picture captured."); 2Z9gOd<M~
nCount=0; h'q0eqYeu)
bRegistered=FALSE; sT"tS>
bTray=FALSE; [F-u'h< *l
//}}AFX_DATA_INIT p 2f
WL
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 iKEKk\j-w
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d~1"{WPSn
} lo;9sTUHT
wk
<~Y 3u
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) uM!r|X)8
{ :x5o3xE
CDialog::DoDataExchange(pDX); ZYt"=\_
//{{AFX_DATA_MAP(CCaptureDlg) ]=XL9MI
DDX_Control(pDX, IDC_KEY, m_Key); \U =>
DDX_Check(pDX, IDC_CONTROL, m_bControl); ,xM*hN3A
DDX_Check(pDX, IDC_ALT, m_bAlt); IhKas4
DDX_Check(pDX, IDC_SHIFT, m_bShift); ~Wd8>a{w
DDX_Text(pDX, IDC_PATH, m_Path); FZ.Yn
DDX_Text(pDX, IDC_NUMBER, m_Number); (IQ L`3f%
//}}AFX_DATA_MAP ,?N_67
} *wZV*)}
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BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^|12~d_.T
//{{AFX_MSG_MAP(CCaptureDlg) JRs[%w`kD
ON_WM_SYSCOMMAND() WD`{kqc
ON_WM_PAINT() #:5g`Ch4,
ON_WM_QUERYDRAGICON() [B;Ek\ 5W
ON_BN_CLICKED(ID_ABOUT, OnAbout) jl%eO.
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) z{+; '9C
ON_BN_CLICKED(ID_CHANGE, OnChange) ~=]@],{
//}}AFX_MSG_MAP H4",r5qw:
END_MESSAGE_MAP() :h dh$}y
4!W?z2ly~R
BOOL CCaptureDlg::OnInitDialog() fe`G^hV
{ +GtGyp
CDialog::OnInitDialog(); _;RD-kv
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); EF{'J8AQ
ASSERT(IDM_ABOUTBOX < 0xF000); otVdx&%]
CMenu* pSysMenu = GetSystemMenu(FALSE); ,'DrFlI
if (pSysMenu != NULL) f;dU72]q+
{ Mp}NUQHE
CString strAboutMenu; /3%xQK>%
strAboutMenu.LoadString(IDS_ABOUTBOX); $ =a$z"
if (!strAboutMenu.IsEmpty()) e[o
;l
{ <G =@Gl
pSysMenu->AppendMenu(MF_SEPARATOR); F09AX'nj
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); yp'>+cLa
} n,LKkOG
} P&,cCR>
SetIcon(m_hIcon, TRUE); // Set big icon \`5u@Nzx
SetIcon(m_hIcon, FALSE); // Set small icon -\v8i.w0
m_Key.SetCurSel(0); ee[NZz
RegisterHotkey(); [<$d@}O
CMenu* pMenu=GetSystemMenu(FALSE); _qNLy/AY
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ?2>v5p
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); nit7|T@^
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5ml}TSMu'
return TRUE; // return TRUE unless you set the focus to a control 4'|:SyOm
} xM,(|p(
p[:%Ck"$7
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >7Q7H#~w
{ SXF_)1QO\W
if ((nID & 0xFFF0) == IDM_ABOUTBOX) mSeNM
{ N'.+ezZ;h
CAboutDlg dlgAbout; h%e!f#
dlgAbout.DoModal(); izo
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} be@uHikp;v
else 2a-hf|b1
{ TnAX;+u
CDialog::OnSysCommand(nID, lParam); 3&:fS|L~c
} S`.-D+.68
} RjHpC7b*%
L@GD$F=<0
void CCaptureDlg::OnPaint() ;Nij*-U4~
{ o|C{ s
if (IsIconic()) Z_+No :F7I
{ Lcm!e
CPaintDC dc(this); // device context for painting (DAJ(r~
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); z6(Q
3@iO
// Center icon in client rectangle 5,Zn$zosJC
int cxIcon = GetSystemMetrics(SM_CXICON); s50ln&2
int cyIcon = GetSystemMetrics(SM_CYICON); q>X2=&1
CRect rect; h (2k;M^s
GetClientRect(&rect); [N)M]u
int x = (rect.Width() - cxIcon + 1) / 2; ![%,pip2/&
int y = (rect.Height() - cyIcon + 1) / 2; cIjsUqKa
// Draw the icon {Wo7=aR
dc.DrawIcon(x, y, m_hIcon); miqCUbcU
} eRbO Hj1
else n
Lb 9$&
{ "-%H</
CDialog::OnPaint(); ~yN,F pD
} l-EQh*!j
} w4a7c
C"<@EMU9
HCURSOR CCaptureDlg::OnQueryDragIcon() ]9Hy
"#Fz
{ (=9&"UH
return (HCURSOR) m_hIcon; L4b4X
} Z
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67?5Cv
void CCaptureDlg::OnCancel() ,jmG!qJb
{ ;\N*iN#K
if(bTray) zdE^v{}|
DeleteIcon(); y
rk#)@/m
CDialog::OnCancel(); CgC wM=!r
} wn&2-m*a
U,BBC
void CCaptureDlg::OnAbout() 6*7&X#gG
{ r8rR _M{P
CAboutDlg dlg; ZI7<E
dlg.DoModal(); Z]<_a)>
} >Fz$DKr[
g:U ul4
void CCaptureDlg::OnBrowse() wG
O)!u 4
{ #eYVZ=E
CString str;
s25012
BROWSEINFO bi; {Y Ymt!Ic
char name[MAX_PATH]; +Sfv.6~v
ZeroMemory(&bi,sizeof(BROWSEINFO)); %:*HzYf
bi.hwndOwner=GetSafeHwnd(); *rLs!/[Z_
bi.pszDisplayName=name; _q 8m$4
bi.lpszTitle="Select folder"; k&b>-QP6
bi.ulFlags=BIF_RETURNONLYFSDIRS; (&(f`c@I
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,tZwXP{
if(idl==NULL) ;/@R{G{+~;
return; |Bp?"8%*l
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); *M:Bhw
str.ReleaseBuffer(); `;;!>rm
m_Path=str; AN@Vos
Cu
if(str.GetAt(str.GetLength()-1)!='\\') 2xX7dl(cC
m_Path+="\\"; f@0`,
UpdateData(FALSE); ZAE;$pkP
} t(Uoi~#[
a|.u;
void CCaptureDlg::SaveBmp() y_6HQ:
{ YdFC YSiS
CDC dc; yFSL7`p+
dc.CreateDC("DISPLAY",NULL,NULL,NULL); VI?[8@*Z
CBitmap bm; ze-iDd_y
int Width=GetSystemMetrics(SM_CXSCREEN); Z(L>~+%
int Height=GetSystemMetrics(SM_CYSCREEN); nV,a|V5Xm
bm.CreateCompatibleBitmap(&dc,Width,Height); mIyaoIE|$
CDC tdc; |fUSq1//
tdc.CreateCompatibleDC(&dc); F}X_I
CBitmap*pOld=tdc.SelectObject(&bm); .NKN2
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); y;;@T X
tdc.SelectObject(pOld); ?V0IryF;
BITMAP btm; CVm*Q[5s"
bm.GetBitmap(&btm); 6
Qmtb2
DWORD size=btm.bmWidthBytes*btm.bmHeight; M0|z^2
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <XNLeJdY
BITMAPINFOHEADER bih; 7$ 'ja
bih.biBitCount=btm.bmBitsPixel; n3(HA
bih.biClrImportant=0; _/Hu'9432
bih.biClrUsed=0; V|7 cdX#H
bih.biCompression=0; [(C lvGx
bih.biHeight=btm.bmHeight; vQ;Z 0_
bih.biPlanes=1; c0@v`-9
bih.biSize=sizeof(BITMAPINFOHEADER); u>BR WN
bih.biSizeImage=size; TtzB[F
bih.biWidth=btm.bmWidth; x-[l`k.V
bih.biXPelsPerMeter=0; ?g 3sv5\u
bih.biYPelsPerMeter=0; /O9z-!Jz
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /#tOi[0[
static int filecount=0; *`kh}
CString name; &:rf80`z.
name.Format("pict%04d.bmp",filecount++); v"`w'+
name=m_Path+name; avQwbAh[
BITMAPFILEHEADER bfh; .m
.v$(
bfh.bfReserved1=bfh.bfReserved2=0; o.,hCg)X
bfh.bfType=((WORD)('M'<< 8)|'B'); hGsYu )
bfh.bfSize=54+size; m9r
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bfh.bfOffBits=54; *p"%cas
CFile bf; h T<v8
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \n}cx~j
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7XaRi@uG
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]c08`
bf.WriteHuge(lpData,size); r'&VH]m
bf.Close(); ,ecFHkT>
nCount++; lyP<&<Y5
} G3q\Z`|3h
GlobalFreePtr(lpData); -{HA+ YL H
if(nCount==1) 2vynz,^ET
m_Number.Format("%d picture captured.",nCount); ,a}+Jj{
else biQDupTz
m_Number.Format("%d pictures captured.",nCount); LVX.s tN#p
UpdateData(FALSE); _di[PU=Vh
} {a(TT)d
8/k*"^3
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) XOU
9r(
{ lwSA!W
if(pMsg -> message == WM_KEYDOWN)
KrB"2e+J
{ wtK+\Qnb
if(pMsg -> wParam == VK_ESCAPE) f mf(5
return TRUE; vLq_l4l
if(pMsg -> wParam == VK_RETURN) }5`Kn}rY
return TRUE; s_/CJ6s
} [&51m^
return CDialog::PreTranslateMessage(pMsg); i!(u4wTFF
} !IcPO
r3'0{Nn+
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l4RZ!K*X_"
{ b:2#3;)
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ `KB; 3L
SaveBmp(); |Y4c+6@_
return FALSE; J.$N<.
} K9]L>Wj
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ \Cx2$<8
CMenu pop; \<TWy&2&
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); F P3{Rp
CMenu*pMenu=pop.GetSubMenu(0); 7*.nd
pMenu->SetDefaultItem(ID_EXITICON); Pd)mLs Jg
CPoint pt; G
.NGS%v
GetCursorPos(&pt); {{qu:(_g
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;X , A|m$(
if(id==ID_EXITICON) a[I
: ^S
DeleteIcon(); Qhy!:\&1
else if(id==ID_EXIT) L xP%o
OnCancel(); #A\@)wJ
return FALSE; f}=>c|Do
} uVN2}3!)Y
LRESULT res= CDialog::WindowProc(message, wParam, lParam); l|v`B6(
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) xa8;"Y~"bg
AddIcon(); FF #T"y0Y
return res; gamE^Ee
} 6+!$x?5|NP
_0}u0fk
void CCaptureDlg::AddIcon() !y+uQ_IS@
{ m~04I~8vk
NOTIFYICONDATA data; MQ#k`b#()
data.cbSize=sizeof(NOTIFYICONDATA); &n9&k
Em
CString tip; 2D UY4Ti
tip.LoadString(IDS_ICONTIP); #zRHYZc'T|
data.hIcon=GetIcon(0); j<'ftKk
data.hWnd=GetSafeHwnd(); K
@RGvP
strcpy(data.szTip,tip); qF\w#nG
data.uCallbackMessage=IDM_SHELL; ox*1F+Xri
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; e.\dqt~%y
data.uID=98; 8yk7d76Y
Shell_NotifyIcon(NIM_ADD,&data); t'1g+g
ShowWindow(SW_HIDE); _iu~vU)r
bTray=TRUE; P?p]sLrP
} 1*" 7q9x
#N"m[$;QR
void CCaptureDlg::DeleteIcon() R:4@a ':H
{ C#-HWoSi
NOTIFYICONDATA data; _B>'07D0
data.cbSize=sizeof(NOTIFYICONDATA); .' }jd#
data.hWnd=GetSafeHwnd(); yIhPB8QL
data.uID=98; aq)g&.dw?
Shell_NotifyIcon(NIM_DELETE,&data); ?VlGTMaS+
ShowWindow(SW_SHOW); A'BqNsy
SetForegroundWindow(); fLnwA|n=
ShowWindow(SW_SHOWNORMAL); h4jo<yp\
bTray=FALSE; 793 15A
} 2xf#@`U
To}eJ$8*5
void CCaptureDlg::OnChange() ^D<CoxG
{ r4pX47H
RegisterHotkey(); T%%
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} ynv{
rMl
Li]bU
BOOL CCaptureDlg::RegisterHotkey() $33E-^
{ ckMG4
3i\j
UpdateData(); 2TUV9Z
UCHAR mask=0; <3!Al,!ej@
UCHAR key=0; ;89kL]
if(m_bControl) iLch3[p%
mask|=4; >ei~:z]R
if(m_bAlt) =WjHf8v;
mask|=2; +q'\rpt
if(m_bShift) #B<EMGH
mask|=1; 23P&n(.
key=Key_Table[m_Key.GetCurSel()]; OKAU*}_
if(bRegistered){ ele@xl
DeleteHotkey(GetSafeHwnd(),cKey,cMask); yAfwQ$Ll7
bRegistered=FALSE; P&sWn?q Ol
} VxBBZsZO~
cMask=mask; 0S^&A?$=
cKey=key; =B9-}]DDO
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g]lEG>y1R
return bRegistered; ss[`*89
} &nP0T-T5y
KEtV
四、小结 nm@h5ON_
7b+r LyS0
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。