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:
vlD!YNy
2ja@NT 一、实现方法
M#sDPT Y{ho[% 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:
e$E~@{[1) (X
rrnoz #pragma data_seg("shareddata")
btfjmR<Tp HHOOK hHook =NULL; //钩子句柄
Q/%(&4>'y UINT nHookCount =0; //挂接的程序数目
k+"+s
bsW' static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
',MiD=_ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
l#FW#`f static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
_d$0( static int KeyCount =0;
:.-z) C} static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
o|s JTY #pragma data_seg()
#L{+V?
.Z!!x 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
RsYn6ozb +7jr ]kP9 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
PC| U] 0`KB|=> BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
M1MpR+7S cKey,UCHAR cMask)
]to"X7/ {
::y+|V/ BOOL bAdded=FALSE;
]y'/7U+ for(int index=0;index<MAX_KEY;index++){
e#YQA if(hCallWnd[index]==0){
_l&`*
2d hCallWnd[index]=hWnd;
KUdpOMYX HotKey[index]=cKey;
>+[uV^2[ HotKeyMask[index]=cMask;
>A$J5B>d bAdded=TRUE;
W |]24 KeyCount++;
!OJ@
=y`i break;
,t+5(qi }
3gW4\2|T }
K)Nbl^6x return bAdded;
ob }
v5|X=B>&> //删除热键
kF9T 9 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,KlTitJl\+ {
3dnL\AqC BOOL bRemoved=FALSE;
g& yR - for(int index=0;index<MAX_KEY;index++){
|S5N$[ if(hCallWnd[index]==hWnd){
9})!~r;| if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
<ByR!Y hCallWnd[index]=NULL;
8t$a8 PE HotKey[index]=0;
t5z6{` HotKeyMask[index]=0;
5q`d=L, bRemoved=TRUE;
O jkbv KeyCount--;
X51 7PT8O break;
^@
GE1 }
f:k3j}& }
w#Y<~W& }
)$/Gh&1G return bRemoved;
G4Zs(:a }
!8"516!d|p 1NO<K` ExDH@Lb DLL中的钩子函数如下:
J}7iXTh \o^M ,yI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
K?_4| {
}N_9&I BOOL bProcessed=FALSE;
,w|f*L$ if(HC_ACTION==nCode)
uc?QS~H&w {
zh$[UdY6 if((lParam&0xc0000000)==0xc0000000){// 有键松开
q/,W'lQ\; switch(wParam)
MOJ-q3H^W {
% Ke:%##Y case VK_MENU:
"HW~|M7>( MaskBits&=~ALTBIT;
DRD%pm( break;
;T}#-`O_Im case VK_CONTROL:
}Po&6^ MaskBits&=~CTRLBIT;
Yn,dM~|Cc break;
=KwG;25hX case VK_SHIFT:
30Nya$$A= MaskBits&=~SHIFTBIT;
J!,5HJh1 break;
]6{G;f$ default: //judge the key and send message
jNN$/ZWm break;
I"E5XVC); }
/xjHzva^ w for(int index=0;index<MAX_KEY;index++){
w$H=GF?" if(hCallWnd[index]==NULL)
,TD@s$2x continue;
,UQ4`Mh^L if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}XCHoB {
;m}lmq, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
da3]#%i0 bProcessed=TRUE;
?lzg )88I }
J<:qzwh }
*-bR~ }
OGNjn9av else if((lParam&0xc000ffff)==1){ //有键按下
Vtm5&- switch(wParam)
E9 QA<w {
\%9,<-~[ case VK_MENU:
\GeUX<Fl MaskBits|=ALTBIT;
^;B
vd! break;
@`U78)] case VK_CONTROL:
%@L(A1"#D MaskBits|=CTRLBIT;
lhAwTOn`Q break;
]*pALT6 case VK_SHIFT:
0fnd9`N!0 MaskBits|=SHIFTBIT;
OvU]|4h break;
-IJt( X| default: //judge the key and send message
"])X0z yM break;
*5 FSq }
pB{QO4qn for(int index=0;index<MAX_KEY;index++){
j_SRCm~: if(hCallWnd[index]==NULL)
h2+vl@X continue;
i% k`/X; if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
3|%Q{U {
tv)x(MX SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
s4lkhoN\t bProcessed=TRUE;
\$s<G|<P }
\;p5Pagx0- }
&|xN=U/ }
$O&P@8:Z if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
zbP0! for(int index=0;index<MAX_KEY;index++){
HE+y1f] if(hCallWnd[index]==NULL)
.l5y!? continue;
%"j<` if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
lyKV^7} SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
pL>Q'{7s3 //lParam的意义可看MSDN中WM_KEYDOWN部分
,;C92XY }
Ul OoMGg }
+L*2 6ar6 }
l%lkDh!$" return CallNextHookEx( hHook, nCode, wParam, lParam );
08vA;6zt }
W,YzD&f=uS {<&I4V@+ 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:
g ZhE\ noa?p&Y1m BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
~f2H@# BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
G@h6>O ]i\D*,FfU 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:
It!%/Y5 =0`"T!1 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
]7v-qd {
_h7! if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
o`\l&jUNe {
^V v7u@y //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
bAt%^pc=y SaveBmp();
^x%yIS return FALSE;
E=GCq=Uw }
JAen=%2b …… //其它处理及默认处理
W'rft@J$ }
gIep6nq1`| ' A= x k}l5v)m 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。
e{.2*>pH A/%K= H? 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。
c[?S}u|[' nK1XJp 二、编程步骤
p0? XR =&xamA) 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";
c*K-?n9YMz -ZH]i}$ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
3zY"9KUN ?s #DD, 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;
md_aD VR2BdfKU, 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;
,\4@Ao WZdA<<,:o 5、 添加代码,编译运行程序。
8(q4D K\5u ,g@U*06 三、程序代码
,SuF1&4 qS>P,>C ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
OF,<K%A #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
8 wQV^G #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
I,QJ/sI #if _MSC_VER > 1000
@~'c(+<3 #pragma once
*-T3'beg #endif // _MSC_VER > 1000
()v[@"J #ifndef __AFXWIN_H__
A!H6$-W|p #error include 'stdafx.h' before including this file for PCH
KWCA9.w4q #endif
$}2m%$vJO #include "resource.h" // main symbols
o5mt7/5[i class CHookApp : public CWinApp
lyfLkBF {
"T?%4^:g public:
-4Zf0r1u CHookApp();
:,y V?E6] // Overrides
d%VGfSrKq // ClassWizard generated virtual function overrides
["Ep.7=SU //{{AFX_VIRTUAL(CHookApp)
6GMQgTY^ public:
F N;X"it. virtual BOOL InitInstance();
Erl"X}P virtual int ExitInstance();
ny'~pT'00 //}}AFX_VIRTUAL
.@JXV
$Z //{{AFX_MSG(CHookApp)
:e ?qm7 cB // NOTE - the ClassWizard will add and remove member functions here.
U:c!9uhp // DO NOT EDIT what you see in these blocks of generated code !
kM*f9x //}}AFX_MSG
X3". DECLARE_MESSAGE_MAP()
zv||&Hi };
KR%p*Nh+C LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
HviL4iO BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
>&RpfE[ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
\gki!!HQ BOOL InitHotkey();
Nj*J~&6G BOOL UnInit();
(ScL C #endif
Xgn^)+V: w'~f Z* //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
"X's>uM #include "stdafx.h"
>e($T!}Z #include "hook.h"
fI`6]?W #include <windowsx.h>
Cd#[b)d ?^ #ifdef _DEBUG
}N:0%Gk[; #define new DEBUG_NEW
.T
L0cf To #undef THIS_FILE
&48wa^d static char THIS_FILE[] = __FILE__;
*I(>[m! #endif
Jj*XnL* #define MAX_KEY 100
,;y5Mu8 #define CTRLBIT 0x04
hZVF72D26 #define ALTBIT 0x02
UMpC2)5 #define SHIFTBIT 0x01
:R{Xd{? #pragma data_seg("shareddata")
Ra&HzK? HHOOK hHook =NULL;
`n
Y!nh6! UINT nHookCount =0;
|0ACapp! static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
c>:}~.~T static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
1,T8@8# static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Z9cch-u~ static int KeyCount =0;
@ T'!;) static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Dh BUMDoB #pragma data_seg()
;yqJEj_m( HINSTANCE hins;
ce.'STm= void VerifyWindow();
(\e,,C%; BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
W=&\d`><k //{{AFX_MSG_MAP(CHookApp)
HtgVD~[] // NOTE - the ClassWizard will add and remove mapping macros here.
q%bNT // DO NOT EDIT what you see in these blocks of generated code!
L:IaJ?+? //}}AFX_MSG_MAP
l6:k|hrm; END_MESSAGE_MAP()
%L=roqz _' Xt CHookApp::CHookApp()
A?ma5h {
u^s{r`/ // TODO: add construction code here,
=&U JFu // Place all significant initialization in InitInstance
v2gK(&? }
$fPf/yQmC vY7C!O/y_k CHookApp theApp;
_]E"hr6a LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
0V{-5-. {
,u-i9`B BOOL bProcessed=FALSE;
fCJ:QK! if(HC_ACTION==nCode)
iS&fp[Th {
8&qCH>Cf if((lParam&0xc0000000)==0xc0000000){// Key up
`E8m>q Ss switch(wParam)
eVjr/nm {
6{8qATLR case VK_MENU:
q*{i /=~ MaskBits&=~ALTBIT;
)Uw
QsP break;
H|tbwU)J case VK_CONTROL:
z
`T<g!Y MaskBits&=~CTRLBIT;
cAM1\3HWT" break;
'M=(5p case VK_SHIFT:
w{?nX6a@p MaskBits&=~SHIFTBIT;
Jt43+] break;
_Xlf}BE default: //judge the key and send message
xop9*Z$ break;
4 C/ }
1u:OzyJy for(int index=0;index<MAX_KEY;index++){
0\qbJ if(hCallWnd[index]==NULL)
QxwZ$?w% continue;
z2i?7)(?;A if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Mc>]ZAz r {
8c3`IIzAS SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Q%o ]&Hdn bProcessed=TRUE;
I;qeDCM }
S7P](F=n# }
]7^OTrZ N }
sI,T"D? else if((lParam&0xc000ffff)==1){ //Key down
YC - -&66 switch(wParam)
4xk'R[v {
1`Cr1pH case VK_MENU:
Q!7Er MaskBits|=ALTBIT;
l]%_D*<Y break;
nmn$$=~) case VK_CONTROL:
w}zl=w{G MaskBits|=CTRLBIT;
Bcg\p} break;
'!]ry< case VK_SHIFT:
oL1m<cQo9 MaskBits|=SHIFTBIT;
bmr.EB/ break;
J!3 X}@_N default: //judge the key and send message
.t.H(Q9 break;
!lG5BOJM }
G#ZU^%$M, for(int index=0;index<MAX_KEY;index++)
H2 5Mx>|d {
j2} C if(hCallWnd[index]==NULL)
5?kJ]: continue;
=>-:o:Cu{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
j+\I4oFN {
?w`uv9NUJ8 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
v*7}ux8 bProcessed=TRUE;
(/1 4)"Sk }
|k$[+53A }
]hpocr }
3kx/Q# if(!bProcessed){
),v[.9!}: for(int index=0;index<MAX_KEY;index++){
}_u1' if(hCallWnd[index]==NULL)
&, hhH_W continue;
lx_jy>$}r if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
{:BAh5e| SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
%EkV-%o* }
jkCa2!WQ'i }
C^9G \s' }
v zgR3r return CallNextHookEx( hHook, nCode, wParam, lParam );
%\Dvng6$ }
dS]TTU1 ,l/~epx4v) BOOL InitHotkey()
0?OTa<c {
h6J0b_3h4 if(hHook!=NULL){
:cU6W2EV nHookCount++;
I/4:SNha return TRUE;
"2} {lu }
<%w)EQf4m else
qd$Y"~Mco hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
[Q+8Ku if(hHook!=NULL)
iR}3 [ nHookCount++;
_`3'D`s return (hHook!=NULL);
}dcXuX4{r }
Age BOOL UnInit()
qQK0s*^W {
q"BM*:W if(nHookCount>1){
u&{}hv&FY nHookCount--;
1./uJB/ return TRUE;
U8TH} 9Q }
d&[Ct0!++u BOOL unhooked = UnhookWindowsHookEx(hHook);
~*"]XE?M if(unhooked==TRUE){
;#-yyU nHookCount=0;
dxHKXw hHook=NULL;
3j<:g%5 }
{l/j?1Dxq return unhooked;
ab"6]%_ }
u@QP<[f
aY`qb Jy BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
MI8f(ZJK5 {
ZqT8G BOOL bAdded=FALSE;
R\DdU-k for(int index=0;index<MAX_KEY;index++){
l
Ozi| if(hCallWnd[index]==0){
{Yq"%n'0 hCallWnd[index]=hWnd;
D1w;cV7/d HotKey[index]=cKey;
_cPGS=Ew HotKeyMask[index]=cMask;
yTt,/+I%gJ bAdded=TRUE;
bm/pLC6%. KeyCount++;
cyYsz'i m break;
X S:W{tL! }
X}"Ic@8 }
^G:}%4 return bAdded;
Tfasry9'8 }
hF m_`J&" GD*rTtDWn BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
B$ty`/{w,B {
mEK0ID\ BOOL bRemoved=FALSE;
3PRg/vD3 for(int index=0;index<MAX_KEY;index++){
KmF"Ccc if(hCallWnd[index]==hWnd){
w5/`_m! if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$y%X#:eLJ hCallWnd[index]=NULL;
z"7I5N HotKey[index]=0;
)w.+( v( HotKeyMask[index]=0;
k OYF]^uJ bRemoved=TRUE;
8&[Lr o9 KeyCount--;
I^}q;L![\ break;
++>HU{ }
<jt_<p
+ }
u.\FNa }
;4(ULJ* return bRemoved;
*[VO03
}
QuB`}rfLf ~rnbuIh void VerifyWindow()
T"h@-UcTl {
pr~%%fCh for(int i=0;i<MAX_KEY;i++){
_xKu EU} if(hCallWnd
!=NULL){ 4KbOyTQ
if(!IsWindow(hCallWnd)){ uGXN ciEp`
hCallWnd=NULL; :? uUh
HotKey=0; m-xnbTcQ
HotKeyMask=0; ]81t~t9LQ
KeyCount--; 4lM)ZDg
} .qd/ft2
} seQSDCsvw*
} 5OJ8o>BF
} B=ckRWq
Uz4!O
BOOL CHookApp::InitInstance() CBkI!
In2
{ #'5C*RO
AFX_MANAGE_STATE(AfxGetStaticModuleState()); egXHp<bqw
hins=AfxGetInstanceHandle(); ^l,(~03_
InitHotkey(); d#tqa`@~
return CWinApp::InitInstance(); mB\)Q J.%
} c[IT?6J4
|\}&mBR
int CHookApp::ExitInstance() FRBW(vKE
{ v|K,
VerifyWindow(); sn!E$ls3O
UnInit(); Q1 t-Z;X
return CWinApp::ExitInstance(); a-\M)}T
} 6%-RKQi
L'Yg$9 Vz
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |]M|IX8
o
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) kVmRv.zZ
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \X*Es.;|x
#if _MSC_VER > 1000 k4C3SI*`4
#pragma once _YK66cS3E/
#endif // _MSC_VER > 1000 ~M c'~:{O
04j]W]8#
class CCaptureDlg : public CDialog ^cz4nW<
{ Sux/='
// Construction gR\z#Sg
public: aAbK{=/y_!
BOOL bTray; &g.do?
BOOL bRegistered; cko^_V&x
BOOL RegisterHotkey(); wB(X(nr
UCHAR cKey; !&eKq?P{j
UCHAR cMask; 7Mj:bm&9
void DeleteIcon(); o){\qhLp
void AddIcon(); sQ}E4Iq1#S
UINT nCount; ;_K3/:
void SaveBmp(); Xf YbWR
CCaptureDlg(CWnd* pParent = NULL); // standard constructor & FpoMW
// Dialog Data W?:e4:Q
//{{AFX_DATA(CCaptureDlg) i^SPNs=
enum { IDD = IDD_CAPTURE_DIALOG }; s+-V^{Ht
CComboBox m_Key; ?Tlt(%f
BOOL m_bControl; ymW? <\AD,
BOOL m_bAlt; Pf:;iXH?
BOOL m_bShift; 5Ic'6AIz
CString m_Path; @ *<`*W
CString m_Number; 'PqKb%B|
//}}AFX_DATA ~Fe$/*v
// ClassWizard generated virtual function overrides 1RgERj
//{{AFX_VIRTUAL(CCaptureDlg) jhJ'fI
public: FX
%(<M
virtual BOOL PreTranslateMessage(MSG* pMsg); v;sWI"Fv!
protected: |muZv!,E
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vf@toYc[E
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); iAr]Ed"9|
//}}AFX_VIRTUAL QPyHos`
// Implementation P!yOA_)as
protected: 8+,I(+
HICON m_hIcon; @$|8zPs
// Generated message map functions M{jJ>S{g
//{{AFX_MSG(CCaptureDlg) :\]qB&
virtual BOOL OnInitDialog(); u_=^Bd
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); .Cu0G1
afx_msg void OnPaint(); JKF/z@Vbe\
afx_msg HCURSOR OnQueryDragIcon(); "!9FJ Y
virtual void OnCancel(); U1)!X@F{
afx_msg void OnAbout(); =&" a:l
afx_msg void OnBrowse(); 7$JOIsM
afx_msg void OnChange(); ]^0mh["
//}}AFX_MSG ANRZQpnXQ
DECLARE_MESSAGE_MAP() 6W/uoH=;
}; )eVn1U2*z.
#endif vhGX&
FvXpqlp
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file .3CQFbHF
#include "stdafx.h" +[`
)t/
#include "Capture.h" jfU$qo!gi
#include "CaptureDlg.h" ~hb;kc3
#include <windowsx.h> wCEcMVT
#pragma comment(lib,"hook.lib") ;--p/h*.
#ifdef _DEBUG 2t;3_C
#define new DEBUG_NEW AbL(F#{
#undef THIS_FILE HBm(l@#.
static char THIS_FILE[] = __FILE__; G2dPm}s ZG
#endif re fAgS!=q
#define IDM_SHELL WM_USER+1 fC+tu>=
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XzB3Xs?W2
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tP89gN^PA|
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; p{x6BVw?>
class CAboutDlg : public CDialog Jow{7@FG
{ c27Zh=;Tj
public: E
<N%
CAboutDlg(); XPLm`Q|1#t
// Dialog Data 2S//5@~_m
//{{AFX_DATA(CAboutDlg) ybv]wBpM:
enum { IDD = IDD_ABOUTBOX }; ]l}bk]
//}}AFX_DATA 5R6QZVc
// ClassWizard generated virtual function overrides LX}|%- iv
//{{AFX_VIRTUAL(CAboutDlg) \j4!dOGZ
protected: Rl'xEtaN
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D7Y?$=0ycb
//}}AFX_VIRTUAL 69 J4p=c,
// Implementation I:WPP'L4o
protected: ;?Q0mXr
//{{AFX_MSG(CAboutDlg) f\z9?Z(~
//}}AFX_MSG F(`Q62o@
DECLARE_MESSAGE_MAP() 65GC7 >[
}; G+tzp&G@
SduUXHk
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) f\;f&GI
{ m4^VlE,`Dh
//{{AFX_DATA_INIT(CAboutDlg) 4{h^O@*g
//}}AFX_DATA_INIT |M EJ)LE7
} @h\i<sh!^
0R;`)V\^
void CAboutDlg::DoDataExchange(CDataExchange* pDX) orFB*{/Z
{ ?4t~z 1.f
CDialog::DoDataExchange(pDX); MfraTUxIo/
//{{AFX_DATA_MAP(CAboutDlg) 212 =+k
//}}AFX_DATA_MAP _MTvNs
} q)PSHr=Z
yMOYTN@]
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) D>kkA|>
//{{AFX_MSG_MAP(CAboutDlg) UMH~Q`"
// No message handlers tPDB'S:&3
//}}AFX_MSG_MAP X^C $|:
END_MESSAGE_MAP() ]j.!
w$`u_P|@E:
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) I.o3Old
: CDialog(CCaptureDlg::IDD, pParent) &-x/c\jz
{ UJ`%uLR~
//{{AFX_DATA_INIT(CCaptureDlg) ]0pI6"
m_bControl = FALSE; <#~n+,
m_bAlt = FALSE; R%JEx3)0m
m_bShift = FALSE; USXPa[
m_Path = _T("c:\\"); BT(G9Pj;
m_Number = _T("0 picture captured."); hP/uS%X
nCount=0; <JZa
bRegistered=FALSE; P.~sNd oJ
bTray=FALSE; G~NhBA9
//}}AFX_DATA_INIT (JiEV3GH
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 F|&mxsL
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); JV!}"[
} HPK}Z|Vl
`U;V-
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) TSsx^h8/
{ obw:@i#
CDialog::DoDataExchange(pDX); U27ja|W^
//{{AFX_DATA_MAP(CCaptureDlg) L~_zR >
DDX_Control(pDX, IDC_KEY, m_Key); ~5Rh7
DDX_Check(pDX, IDC_CONTROL, m_bControl); 7RgnL<t~:8
DDX_Check(pDX, IDC_ALT, m_bAlt); [{J1b
DDX_Check(pDX, IDC_SHIFT, m_bShift); &jDRRT3
DDX_Text(pDX, IDC_PATH, m_Path); tdC
kvVE
DDX_Text(pDX, IDC_NUMBER, m_Number); XB%`5wwd
//}}AFX_DATA_MAP n4
Y
]v
} }Z`@Z'
YC}$O2
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) E
eCgV{9B
//{{AFX_MSG_MAP(CCaptureDlg) EKT"pL-EY
ON_WM_SYSCOMMAND() 6.4,Qae9E
ON_WM_PAINT() ;"%luQA<w
ON_WM_QUERYDRAGICON() =k+i5:@]
ON_BN_CLICKED(ID_ABOUT, OnAbout) gwYTOs^
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) wD[qE
ON_BN_CLICKED(ID_CHANGE, OnChange) taOsC!Bp
//}}AFX_MSG_MAP T0}P 'q
END_MESSAGE_MAP() {K2F(kz?T
zdDJcdbGd1
BOOL CCaptureDlg::OnInitDialog() }Z\+Qc<<
{ 14\!FCe)!
CDialog::OnInitDialog(); M~!LjJg;
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _d<\@Tkw
ASSERT(IDM_ABOUTBOX < 0xF000); /XW,H0pR
CMenu* pSysMenu = GetSystemMenu(FALSE); Mq,_DQ
if (pSysMenu != NULL) *-9b!>5eD
{ ,#-^
CString strAboutMenu; 9a_(_g>S
strAboutMenu.LoadString(IDS_ABOUTBOX); GgjBLe=C
if (!strAboutMenu.IsEmpty()) 6d/b*,4[
{ fmq^AnKd
pSysMenu->AppendMenu(MF_SEPARATOR); FkT% -I
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); RrqZ5Gonj
} qsL6*(S(r
} ?)5M3lV3k
SetIcon(m_hIcon, TRUE); // Set big icon iF]vIg#h
SetIcon(m_hIcon, FALSE); // Set small icon ]0:R^dHE
m_Key.SetCurSel(0); x9CI>l
RegisterHotkey(); Jh:-<xy)
CMenu* pMenu=GetSystemMenu(FALSE); /7zy5
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); **O4"+Xi8
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9/|i.2&
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 'C*NyHc
return TRUE; // return TRUE unless you set the focus to a control -/&6}lD
} gf2w@CVF>=
9uREbip
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >Y< y]vM:
{ G8?<(.pi@
if ((nID & 0xFFF0) == IDM_ABOUTBOX) W.,J'
{ efP2 C\
CAboutDlg dlgAbout; wh:`4Yw
dlgAbout.DoModal(); QX~*aqS3s8
} ArU>./)Q
else ?-'Q-\j
{ YKvFZH)
CDialog::OnSysCommand(nID, lParam); fhn0^Qc"+
} Tm^zoVi
} AjANuyUaP
^NLKX5Q
void CCaptureDlg::OnPaint() x{*!"a>
{ 9e :E% 2
if (IsIconic()) (*fsv
g~
{ Nmsb
CPaintDC dc(this); // device context for painting aLXA9?
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); e@,,;YO#4
// Center icon in client rectangle cmN0ya
int cxIcon = GetSystemMetrics(SM_CXICON); rb\Ohv\
int cyIcon = GetSystemMetrics(SM_CYICON); xD?{Hw>QT#
CRect rect; 5\Y/s o=
GetClientRect(&rect); 6eK^T=
int x = (rect.Width() - cxIcon + 1) / 2; '\*Rw]bR|
int y = (rect.Height() - cyIcon + 1) / 2; qryt1~Dq
// Draw the icon 3Ob"r`
dc.DrawIcon(x, y, m_hIcon); r IK|} 5
} ZJ[ Uz_%W
else OEwfNZQ-
{ BtHvfoT
CDialog::OnPaint(); JN KZ'9
} /?XfVhA:A
} =OZ_\vO
C${TC+z
HCURSOR CCaptureDlg::OnQueryDragIcon() b);}x1L.T
{ }lb.3fqiA
return (HCURSOR) m_hIcon; z:G9Uu3H(
} (
L6`_)
"&+0jfLY+
void CCaptureDlg::OnCancel() N8{>M,
{ M{4_BQ4$
if(bTray) 6kuSkd$.
DeleteIcon(); 3 z#;0n}
CDialog::OnCancel(); `WW0~Tp3
} v1lj /A
P%lLKSA
void CCaptureDlg::OnAbout() T?ZMmUE
{ 6e*b;{d
CAboutDlg dlg; n|*V
8VaL
dlg.DoModal(); &4[iC/}
} -oo=IUk
o_N02l4J)
void CCaptureDlg::OnBrowse() '} kq@
{ dCK-"#T!
CString str; >lW*%{|b$^
BROWSEINFO bi; Q}T9NzOH%
char name[MAX_PATH]; *3K"Kc2
ZeroMemory(&bi,sizeof(BROWSEINFO)); nJya1AH;
bi.hwndOwner=GetSafeHwnd(); )AoFd>
bi.pszDisplayName=name; 2yZ6:U~
bi.lpszTitle="Select folder"; ~z}au"k
bi.ulFlags=BIF_RETURNONLYFSDIRS; ;~bn@T-
LPITEMIDLIST idl=SHBrowseForFolder(&bi); }a1UOScO0
if(idl==NULL) hF 1/=;>
return; ZkJM?Fzq
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); IXN4?=)I
str.ReleaseBuffer(); M5V1j(URE
m_Path=str; g3XAs@
if(str.GetAt(str.GetLength()-1)!='\\') XL3h ;$,
m_Path+="\\"; z&0V21"l
UpdateData(FALSE); f.$o|R=v
} z)~!G~J]
Em;b,x*U
void CCaptureDlg::SaveBmp() ]`XuE-Uh
{ 4Dia#1$:J
CDC dc; 9-^p23.@[j
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,lJ6"J\8.
CBitmap bm; TfVD'HAN;l
int Width=GetSystemMetrics(SM_CXSCREEN); v1=X =H
int Height=GetSystemMetrics(SM_CYSCREEN); pQ Y>
bm.CreateCompatibleBitmap(&dc,Width,Height); G~L?q~b
CDC tdc; WLLv a<{
tdc.CreateCompatibleDC(&dc); J":9
CBitmap*pOld=tdc.SelectObject(&bm); @;}H<&"
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }$1;<
tdc.SelectObject(pOld); eLny-.i,7
BITMAP btm; 0Y2^}u@5
bm.GetBitmap(&btm); [BBKj)IK
DWORD size=btm.bmWidthBytes*btm.bmHeight; F/SsiUBS
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Cpcd`y=IN
BITMAPINFOHEADER bih; h$k3MhYDes
bih.biBitCount=btm.bmBitsPixel; '>Y
2lqa
bih.biClrImportant=0; =7Vl{>*1N
bih.biClrUsed=0; HJR<d&l;p
bih.biCompression=0; Dj+Osh
bih.biHeight=btm.bmHeight; #L0I+ K,K\
bih.biPlanes=1; ~,68S^nP)H
bih.biSize=sizeof(BITMAPINFOHEADER); Xh"iP %
bih.biSizeImage=size; 1qe^rz|
bih.biWidth=btm.bmWidth; qo-F9u1J
bih.biXPelsPerMeter=0; Y0\\(0j64
bih.biYPelsPerMeter=0; 0s""%MhFI
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ';,Bn9rv
static int filecount=0; {7>CA'>
CString name; "D(8]EG=
name.Format("pict%04d.bmp",filecount++); -3tBN*0+
name=m_Path+name; QCfpDE}
BITMAPFILEHEADER bfh; pHB35=p28
bfh.bfReserved1=bfh.bfReserved2=0; y9li<u<PF
bfh.bfType=((WORD)('M'<< 8)|'B'); B kxhF
bfh.bfSize=54+size; Bq]O &>\hX
bfh.bfOffBits=54; Gc!8v}[7J
CFile bf; j(C
UYm
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ y32++b!
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); IWo~s
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "%Ana=cc
bf.WriteHuge(lpData,size); l\;mP.!
bf.Close(); ?_>^<1I1
nCount++; G=HxD4l
} NJf(,Mr*|
GlobalFreePtr(lpData); ]}7rWs[|1
if(nCount==1) 1bZiPG{
m_Number.Format("%d picture captured.",nCount); |cGeL[
else #S%Y;ilq
m_Number.Format("%d pictures captured.",nCount); vj&5`
UpdateData(FALSE); 4t
Nv q
} ,i?!3oLT
Z/kaRnG[@t
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) J.mewD!%z
{ 4ylDD|) rO
if(pMsg -> message == WM_KEYDOWN) )YMlFzYr
{ 3U"')
if(pMsg -> wParam == VK_ESCAPE) u] U)d$|
return TRUE; Cz@FZb8
if(pMsg -> wParam == VK_RETURN) 'gZbNg=&[
return TRUE; M"5!s,
} CQjZAv
return CDialog::PreTranslateMessage(pMsg); r7"A u"
} /witDu7
6~F#F)C'
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *rn]/w8ZW
{ D<bU~Gd,P
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5`"*y iv
SaveBmp(); $FQcDo|[
return FALSE; 7<1fKrN?GF
} 1Y"35)CR)
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =Esbeb7P
CMenu pop; nl'J.dJe
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); yMbcFDlBr
CMenu*pMenu=pop.GetSubMenu(0); }-{ b$6]
pMenu->SetDefaultItem(ID_EXITICON); `[@^m5?b-
CPoint pt; 2rO)qjiH
GetCursorPos(&pt); M*O(+EM
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); IQw
%|^
if(id==ID_EXITICON) L)/6kt=
DeleteIcon(); 6c2ThtL
else if(id==ID_EXIT) dF{6>8D=5B
OnCancel(); w`j*W$82
return FALSE; 9eGCBVW:*
} ]D{c4)\7C|
LRESULT res= CDialog::WindowProc(message, wParam, lParam); gj[ >p=Wn
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ]M~8@K
AddIcon(); 3V/_I<y
return res; Eg`R|CF
} a:yB%:2
8B *E+f0
void CCaptureDlg::AddIcon() K5!";V
{ emv ;m/&8
NOTIFYICONDATA data; +MNSZLP]
data.cbSize=sizeof(NOTIFYICONDATA); NWJcFj_
CString tip; Nt
zq"ces)
tip.LoadString(IDS_ICONTIP); M)"]$TM
data.hIcon=GetIcon(0); O1?B{F/ e
data.hWnd=GetSafeHwnd(); e{fZ}`=7y
strcpy(data.szTip,tip); "u(S2'DW'(
data.uCallbackMessage=IDM_SHELL; oUQGLl!V
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; iN<(O7B;
data.uID=98; G-\<5]k]
Shell_NotifyIcon(NIM_ADD,&data); [i(Cl}
ShowWindow(SW_HIDE); DC|xilP1O
bTray=TRUE; 9 m\)\/V
} S9G8aea/
0
&*P}U}Uc
void CCaptureDlg::DeleteIcon() m x3}m?WQ
{ [as-3&5S
NOTIFYICONDATA data; _kn]#^ucCe
data.cbSize=sizeof(NOTIFYICONDATA); 0\5M^:8i3
data.hWnd=GetSafeHwnd(); GFdZ`i
data.uID=98; *>e~_{F
Shell_NotifyIcon(NIM_DELETE,&data); j7@!J7S
ShowWindow(SW_SHOW); !~K=#"T
SetForegroundWindow(); gf0PMc3l
ShowWindow(SW_SHOWNORMAL); DUZQO{V
bTray=FALSE; ra]!4Kd'
} iD%qy /I/
0=OD?48<
void CCaptureDlg::OnChange() tCZpfZ@+=
{ `GvA241
RegisterHotkey(); tCWJSi`IJ
} <^#P6
cwu$TP A>
BOOL CCaptureDlg::RegisterHotkey() 0fnZR$PB
{ |yLk5e~@-
UpdateData(); `Uzs+k-]
UCHAR mask=0; 3%XG@OgP
UCHAR key=0; T|;^.TZ
if(m_bControl) TT|-aS0l(u
mask|=4; ob0~VEH-
if(m_bAlt) OYBotk]{1
mask|=2; d4ic9u*D
if(m_bShift) (JevHdI*V
mask|=1; +->\79<#V(
key=Key_Table[m_Key.GetCurSel()]; jZrY=f
if(bRegistered){ ]|,vCKju
DeleteHotkey(GetSafeHwnd(),cKey,cMask); iH[E=
6*
bRegistered=FALSE; +yth_9
} De;, =BSp
cMask=mask; hgj CXl
cKey=key; f4R1$(<
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); dF$KrwDK
return bRegistered; > P(eW7RL
} DWuRJ
(Ar?QwP9>
四、小结 ~Y% :
3
,MRvuw0P
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。