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:
bf1$:09
CKFr9bT{ 一、实现方法
^qBm%R( @cxM#N8e 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
,\3Cq2h Z[Iej:o5 #pragma data_seg("shareddata")
HfP<hQmN' HHOOK hHook =NULL; //钩子句柄
l?m 3* UINT nHookCount =0; //挂接的程序数目
roG<2i F static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
b5jD /X4 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
| a
i#rU static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
XH*(zTd(? static int KeyCount =0;
mRyf+O[ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
+jq@!P"}d #pragma data_seg()
=^*EM<WG) %yKcp5_ 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
vmOye/?k 0;=]MEk? DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
47*2QL^zj E#tfCM6 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
&6Lh>n( cKey,UCHAR cMask)
^b$G.h{o!E {
ouo IbA9X BOOL bAdded=FALSE;
A(BjU:D(Oj for(int index=0;index<MAX_KEY;index++){
?aBAmyxm if(hCallWnd[index]==0){
A~k:
m0MX hCallWnd[index]=hWnd;
7TypzgXNe HotKey[index]=cKey;
)w&|VvM )L HotKeyMask[index]=cMask;
^e =xEZD bAdded=TRUE;
}z\ t}lven KeyCount++;
'
Gx\ break;
glM42s }
S;8=+I, }
2Z<S^9O9 return bAdded;
G\k&sF }
KMfRMc& //删除热键
Td7Q%7p: BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;"9Ks. {
'h~IbP BOOL bRemoved=FALSE;
l9+CJAmq for(int index=0;index<MAX_KEY;index++){
>}]bKq if(hCallWnd[index]==hWnd){
U Lq`!1{
if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
QJR},nZ3 hCallWnd[index]=NULL;
VB8eGMo HotKey[index]=0;
&\6(iL HotKeyMask[index]=0;
GuL0:, bRemoved=TRUE;
QL2LIs KeyCount--;
eDNY|}$}v break;
HJ"sK5Q }
>
9z-/e }
vKdS1Dn1 }
D0S^Msk9L return bRemoved;
~WV1t][ }
:AuK Q`c P&Xy6@%[Z DSp~k) DLL中的钩子函数如下:
j 7O!uUQQ fffWvf LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
9M|#X1r{%{ {
-{d(~XIo BOOL bProcessed=FALSE;
f1o^:}5x if(HC_ACTION==nCode)
94*MRn1E {
) 54cG if((lParam&0xc0000000)==0xc0000000){// 有键松开
_x!/40^G switch(wParam)
/Q#eP m {
l 8GAZ*+ case VK_MENU:
KiC,O7&< MaskBits&=~ALTBIT;
c1*^
\ break;
@&Yl'&pn-R case VK_CONTROL:
!>K=@9NC|. MaskBits&=~CTRLBIT;
v6x jLP;O break;
33hP/p% case VK_SHIFT:
PIQd=%?' MaskBits&=~SHIFTBIT;
qla=LS\-A+ break;
`r\/5|M default: //judge the key and send message
+8|Xj!!*} break;
d=\\ik8 }
,~l4-x., for(int index=0;index<MAX_KEY;index++){
l}g_< if(hCallWnd[index]==NULL)
duCXCX^n
T continue;
}J\7IsM& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
C^U>{jf ! {
gMZrtK`< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
>k/
rJ[Sc bProcessed=TRUE;
!|ic{1!_ }
5Go@1X]I }
wb]Z4/j# }
-&v0JvTJ9j else if((lParam&0xc000ffff)==1){ //有键按下
r>"l:GZ switch(wParam)
$3970ni,?O {
;\/RgN case VK_MENU:
d1*0?G TT MaskBits|=ALTBIT;
4}YHg&@\d% break;
O=!Eqa ExW case VK_CONTROL:
+tYskx/ MaskBits|=CTRLBIT;
"oR%0pU* break;
YsTF10 case VK_SHIFT:
Ac
+fL MaskBits|=SHIFTBIT;
4!'4 l=jO break;
kO/;lrwC default: //judge the key and send message
'^2bC break;
"Vwk&~B% }
$B%3#- for(int index=0;index<MAX_KEY;index++){
AX )dZdd if(hCallWnd[index]==NULL)
/KO2y0` continue;
?i~mt'O if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6gq`V, {
nK]L0 *s SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
N{!@M_C^%R bProcessed=TRUE;
10_@'N }
Nlm3RxSn }
}:b) =fs }
c&SSf_0O* if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Y#U0g|UDn for(int index=0;index<MAX_KEY;index++){
g9=O<u# if(hCallWnd[index]==NULL)
#'y^@90R continue;
86Xf6Ea if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
T(+*y SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
f2Tz5slE //lParam的意义可看MSDN中WM_KEYDOWN部分
79'N/:. }
dW|S\S'& }
dJ{'b'# }
<Lq.J`|+ return CallNextHookEx( hHook, nCode, wParam, lParam );
3J^'x }
jrYA5>=># 0IbR>zFg. 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
oi^pU U,~Z 2L BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
sbFA{l3 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
nh"LdHqiDB %#lJn.o 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
F
@Wb<+0 il:RE8 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
vH?3UW {
CX>QP&Gj if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
<gY.2#6C\% {
dJmr!bN\; //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Z&J.8A]L SaveBmp();
8d>>r69$pa return FALSE;
FWpb5jc)3 }
P # Z+:T …… //其它处理及默认处理
+[=%W }
KMV&c j"P}Wn 4Mjcx.21 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。
-[5yp 2F-{ g; ZVoD 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。
7{u1ynt xJE26i 二、编程步骤
~5_>$7L> /p[lO g 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
Sh o] ~)XX :x_;- 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
4VlQN$ zT _[pa)O` 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;
77zDHq= )Yw m_f-N 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;
X>s'_F? !
d " i 5、 添加代码,编译运行程序。
8$6^S{M3 Cn8w})B 三、程序代码
7E)*]7B% {
daEKac5 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
<0^L L #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
':?MFkYC #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
=:7OS>x #if _MSC_VER > 1000
7D)i]68E #pragma once
EN@Pr `R #endif // _MSC_VER > 1000
Kd^,NAg #ifndef __AFXWIN_H__
P}$DCD<$U #error include 'stdafx.h' before including this file for PCH
ZklZU,\!|v #endif
%0^taA #include "resource.h" // main symbols
FTZaN1%` class CHookApp : public CWinApp
oxgh;v* {
UhF+},gU public:
sT% ^W CHookApp();
oi/bp#(fa // Overrides
^-pHhh|g // ClassWizard generated virtual function overrides
"_36WX //{{AFX_VIRTUAL(CHookApp)
=jW=Z$3q public:
Bis'59?U_ virtual BOOL InitInstance();
`]l*H3+hg virtual int ExitInstance();
pe7R1{2Q_s //}}AFX_VIRTUAL
DM)%=C6< //{{AFX_MSG(CHookApp)
RS1c+]rr // NOTE - the ClassWizard will add and remove member functions here.
s*.&DN // DO NOT EDIT what you see in these blocks of generated code !
$tFmp) //}}AFX_MSG
c/ABBvd| DECLARE_MESSAGE_MAP()
!$^LTBOH3 };
m}>#s3KPA LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
zD}2Zh] BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
D= LLm$y
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
[(4s\c BOOL InitHotkey();
'6W|, BOOL UnInit();
'"<h;| #endif
~OQ/ |ws vB T]a //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Q GQ}I #include "stdafx.h"
;chz};zY #include "hook.h"
k_%"# #include <windowsx.h>
0 P-eC|0 #ifdef _DEBUG
C%\. #define new DEBUG_NEW
0!!z'm3
#undef THIS_FILE
vd}Y$X static char THIS_FILE[] = __FILE__;
(}NKW #endif
r1QLSD]i6 #define MAX_KEY 100
8 ,<F102( #define CTRLBIT 0x04
;Jq 7E #define ALTBIT 0x02
xHY#" #define SHIFTBIT 0x01
1 n<7YO7} #pragma data_seg("shareddata")
Y)]x1I HHOOK hHook =NULL;
HOrD20 UINT nHookCount =0;
nq"U`z@R static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
0h",. static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
;wvhe;! static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
d~-Cr-s4 static int KeyCount =0;
W|aFEY static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
q_|YLs` #pragma data_seg()
5 U{}A\q HINSTANCE hins;
WTP~MJ#C void VerifyWindow();
Rr/sxR|0_ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Fj~,> //{{AFX_MSG_MAP(CHookApp)
W.t` // NOTE - the ClassWizard will add and remove mapping macros here.
V:vYS // DO NOT EDIT what you see in these blocks of generated code!
UL
//}}AFX_MSG_MAP
z&r@c-l@ END_MESSAGE_MAP()
?* %JGz_ Gh #$[5&` CHookApp::CHookApp()
n_X)6 s {
?$&iVN^UA // TODO: add construction code here,
iO_6>&( // Place all significant initialization in InitInstance
pN
^^U[ }
pAd 8-a Xitsbf=Gg CHookApp theApp;
M@b:~mI[sw LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
gnPu{-Ec* {
_9Zwg+oO[ BOOL bProcessed=FALSE;
eURj'8o), if(HC_ACTION==nCode)
:_y}8am;H~ {
CVyE5w if((lParam&0xc0000000)==0xc0000000){// Key up
vw/L|b7G switch(wParam)
>
R5<D'cEN {
tEXY>= case VK_MENU:
Ckc4U. t| MaskBits&=~ALTBIT;
FV->226o% break;
#nOS7Q#uW case VK_CONTROL:
SZ[,(h MaskBits&=~CTRLBIT;
Fs,#d%4 @% break;
?UGA-^E1 case VK_SHIFT:
^YLk&A)X MaskBits&=~SHIFTBIT;
VS{po:]A break;
+jPs0?}s default: //judge the key and send message
[9S? break;
R;68C6 4 }
aX'R&R for(int index=0;index<MAX_KEY;index++){
w`")^KXi if(hCallWnd[index]==NULL)
4.}{B_)LK continue;
@d]a#ypU if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
97%S{_2m/ {
L6-zQztn SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
^t'mfG|DV bProcessed=TRUE;
:t36]NM }
PfRe)JuB }
U)n+j}vi }
O*8.kqlgt else if((lParam&0xc000ffff)==1){ //Key down
S?k G|y switch(wParam)
C;C= g1I} {
L93&.d@m9 case VK_MENU:
muc>4!Q MaskBits|=ALTBIT;
6pHn%yE* break;
~RRp5x _ case VK_CONTROL:
g]hTz)8fF MaskBits|=CTRLBIT;
Xj^Hy"HC^~ break;
vCB0x:/ case VK_SHIFT:
Y%B:IeF} MaskBits|=SHIFTBIT;
n7r )wy break;
bvK fxAih default: //judge the key and send message
d 18>0R break;
};z[x2l^ }
&u@<0 1= for(int index=0;index<MAX_KEY;index++)
o'8`>rb {
TNHkHR[& if(hCallWnd[index]==NULL)
#:yh2y7a% continue;
X?'v FC if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
wInJ!1 {
,a&&y0, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
,'E+f% bProcessed=TRUE;
#H;yXsR` }
m1mA:R\zM }
#BK3CD(& }
7vRFF@eq} if(!bProcessed){
t3dvHU&Z: for(int index=0;index<MAX_KEY;index++){
ve [*t ` if(hCallWnd[index]==NULL)
GRt1]%l#$ continue;
<]jKpJ{3N if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#@*;Y(9Ol SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
X
\1grM }
w[bhm$SX]B }
c%N8|!e }
P}AfXgr return CallNextHookEx( hHook, nCode, wParam, lParam );
-f+U:/'.>v }
,'KQF C <u'q._m BOOL InitHotkey()
Y2)2
tzr] {
U49#?^? if(hHook!=NULL){
Y]ZNAR nHookCount++;
Vl0
J!JK_ return TRUE;
ac-R q.GQY }
m,,FNYW else
YhVV~bvz* hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
<)vjoRv if(hHook!=NULL)
]%RX\~Q.4 nHookCount++;
'DB4po. return (hHook!=NULL);
P2q'P& }
`pHlGbrW BOOL UnInit()
nMniHB' {
uEK9 if(nHookCount>1){
eq|G\XJ nHookCount--;
\sUk71L`j return TRUE;
u;[*Z }
Y'75DE<BC BOOL unhooked = UnhookWindowsHookEx(hHook);
x2^Yvgc- if(unhooked==TRUE){
Guc~]
B nHookCount=0;
3(Y#*f| hHook=NULL;
80p? qe }
C1/<t)^ return unhooked;
y}'c)u }
A 11w{`EM &s +DK` BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
!zd]6YL$ {
{iyO96YI[^ BOOL bAdded=FALSE;
M=mzl750M for(int index=0;index<MAX_KEY;index++){
&m>yY{be if(hCallWnd[index]==0){
TTJFF\$? hCallWnd[index]=hWnd;
F)W7,^=X>- HotKey[index]=cKey;
VUo7Evc:.P HotKeyMask[index]=cMask;
_o
2pyV& bAdded=TRUE;
kiW|h)w_,v KeyCount++;
]/o0p break;
MQ9Nn|4 }
t3~ZGOn }
bD&^-&
G return bAdded;
Qj?qWVapA }
-FAAP&LG Au q) BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
C&&*6E5 {
"kE$2Kg BOOL bRemoved=FALSE;
3Ishe" for(int index=0;index<MAX_KEY;index++){
7 +RsZu if(hCallWnd[index]==hWnd){
-|?I'~[#( if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
4oY<O hCallWnd[index]=NULL;
#s'UA!) HotKey[index]=0;
36NENzK HotKeyMask[index]=0;
Q:
H`TSR] bRemoved=TRUE;
bJ[{[|yEd KeyCount--;
/~,|zz break;
8y<NT" }
0 > }
\m>mE/N }
QbF!V%+a's return bRemoved;
SMMV$;O{9 }
DNP%]{J |C \%H R void VerifyWindow()
zyznFiE {
zL1*w@6 for(int i=0;i<MAX_KEY;i++){
y+ZRh?2 if(hCallWnd
!=NULL){ <Ae1YHUY
if(!IsWindow(hCallWnd)){ :'L^zGf
hCallWnd=NULL; j^t#>tZS
HotKey=0; F__(iXxC
HotKeyMask=0; 9]ga\>v
KeyCount--; (8[et m
} ;*3OkNxa3
} l5> H\
} JGJXV3AT
} =F(fum;zH
qjK'sge/
BOOL CHookApp::InitInstance() eV?._-G
{ i2a""zac
AFX_MANAGE_STATE(AfxGetStaticModuleState()); D{Zjo)&tF'
hins=AfxGetInstanceHandle(); {,Y?+F
InitHotkey(); 2:31J4t-<
return CWinApp::InitInstance(); ]kJinXHW
} sH//*y
&rTOJ1)V}
int CHookApp::ExitInstance() U]Iypl`l
{ 0i76(2
VerifyWindow(); 7J
0=HbH
UnInit(); @Axwj
return CWinApp::ExitInstance(); i.eu$~F
} U_/sY9gz(
7^{M:kYC!
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $6W o$c%
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) o%!8t_1mR
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ :# 1d;jx
#if _MSC_VER > 1000 (*.t~6c?5
#pragma once l?F&I.{J
#endif // _MSC_VER > 1000 xQ4'$rL1d
^)r^k8y'
class CCaptureDlg : public CDialog On[:]#
{ ~Rs_ep'+Q2
// Construction rf2+~B{$,
public: y7K&@Y
BOOL bTray; hAPWEh^
BOOL bRegistered; 6x1!!X+)+
BOOL RegisterHotkey(); .qjVw?E
UCHAR cKey; s0}OsHAj
UCHAR cMask; Ca: jN0
void DeleteIcon();
F
%OA
void AddIcon(); D1&%N{
UINT nCount; P'.M.I@
void SaveBmp(); bB|UQaCl
CCaptureDlg(CWnd* pParent = NULL); // standard constructor c:
/Wk
// Dialog Data `$IuN*
//{{AFX_DATA(CCaptureDlg) `m6>r9:
enum { IDD = IDD_CAPTURE_DIALOG }; ZRDY`eK
CComboBox m_Key; 0KW@j>=jK
BOOL m_bControl; zJp}JO
BOOL m_bAlt; 0]x g E
BOOL m_bShift; 2OXcP!\Y
CString m_Path; @a AR99 M
CString m_Number; 'A0.(a5
//}}AFX_DATA 41c]o<!=)j
// ClassWizard generated virtual function overrides vqq7IV)|
//{{AFX_VIRTUAL(CCaptureDlg) [dm&I#m=
public: <kQ
5sG
virtual BOOL PreTranslateMessage(MSG* pMsg); rJ
LlDKP-(
protected: }GIwYh/
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UL81x72O
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); JArSJ:}
//}}AFX_VIRTUAL Dg^n`[WO
// Implementation s>=DfE-;"
protected: _j$"fg
HICON m_hIcon; 9H@I<`qGC
// Generated message map functions R3nCk-Dq
//{{AFX_MSG(CCaptureDlg) ^/|agQ7D2
virtual BOOL OnInitDialog(); P8tpbdZE-
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); l+6y$2QR
afx_msg void OnPaint(); }T@^wY_Ow
afx_msg HCURSOR OnQueryDragIcon(); J%G
EIe|
virtual void OnCancel(); vwVK^B
afx_msg void OnAbout(); &PHejG_#
afx_msg void OnBrowse(); 3F5Y#[L`
afx_msg void OnChange(); RlRkw+%m
//}}AFX_MSG 8dg\_H_
DECLARE_MESSAGE_MAP() !.(Kpcrg
}; uSZCJ#'G
#endif axJuJ`+Y
=oZHN,
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file mWOW39Ku
#include "stdafx.h" >]6f!;Rt
#include "Capture.h" :n'$Txf
#include "CaptureDlg.h" :%[=v(G[
#include <windowsx.h> q=NI}k
#pragma comment(lib,"hook.lib") v-zi ,]W
#ifdef _DEBUG -f&16pc1t
#define new DEBUG_NEW P`/;3u/P
#undef THIS_FILE yc4?'k!
static char THIS_FILE[] = __FILE__; -__RFxG
#endif 9`83cL
#define IDM_SHELL WM_USER+1 F`/-Q>Q
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?C('
z7
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); d~i WV6Va
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; (G:A^z
class CAboutDlg : public CDialog Gm,vLs9H$T
{ }2WscxL
public: ~r/"w'dB
CAboutDlg(); 3AKT>Wy =
// Dialog Data 'r&az BO
//{{AFX_DATA(CAboutDlg) G,tJ\xMw8
enum { IDD = IDD_ABOUTBOX }; v"nN[_T
//}}AFX_DATA
Bw;gl^:UG
// ClassWizard generated virtual function overrides r57&F`{
//{{AFX_VIRTUAL(CAboutDlg) 1&zvf4
protected: cT2&nZ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Q5[x2 s_ d
//}}AFX_VIRTUAL :O`7kZ]=n
// Implementation ~d0:>8zQR
protected: OT1
//{{AFX_MSG(CAboutDlg) @ |bN[X L
//}}AFX_MSG 4(
Q_J4}P
DECLARE_MESSAGE_MAP() / z<7gd~oU
}; ^$8@B]*
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CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
G.2\Sw
{ pbfIO47ZC
//{{AFX_DATA_INIT(CAboutDlg) f`ro{p
//}}AFX_DATA_INIT [I*)H7pt}
} {1 VHz])I
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void CAboutDlg::DoDataExchange(CDataExchange* pDX) BZS%p
{ |l4tR
CDialog::DoDataExchange(pDX); xJG&vOf;?
//{{AFX_DATA_MAP(CAboutDlg) -^1}J
//}}AFX_DATA_MAP 8Zj=:;
} N>R\,n|I
dTV4 Q`Z
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1NHiW
v
//{{AFX_MSG_MAP(CAboutDlg) I5nxY)v
// No message handlers OyI?P_0u
//}}AFX_MSG_MAP ` ,lm:x+(0
END_MESSAGE_MAP() o#"U8N%r
KCBA`N8
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) L/ L#[
: CDialog(CCaptureDlg::IDD, pParent) z7vc|Z|
{ 5j8aMnv s
//{{AFX_DATA_INIT(CCaptureDlg) /
.wO<l=
m_bControl = FALSE; @nC][gNv
m_bAlt = FALSE; b 7XTOB_HO
m_bShift = FALSE; ;jgk53lo
m_Path = _T("c:\\"); _Y{8FN(4
m_Number = _T("0 picture captured."); Hw0S/ytY
nCount=0; M~rN17S
bRegistered=FALSE; =`MxgK +
bTray=FALSE; s3(mkdXv
//}}AFX_DATA_INIT U0ZT9/4
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Yfbo=yk
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); oI\Lepl*
} ,9A1p06
GHs,,J;
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {yo{@pdX>
{ HbOLf
CDialog::DoDataExchange(pDX); m|')
A
//{{AFX_DATA_MAP(CCaptureDlg) O/XG}G.x|
DDX_Control(pDX, IDC_KEY, m_Key); C F,-l
B
DDX_Check(pDX, IDC_CONTROL, m_bControl); 9"W 3t]
DDX_Check(pDX, IDC_ALT, m_bAlt); Yvi.l6JL
DDX_Check(pDX, IDC_SHIFT, m_bShift); O{vVW9Q
DDX_Text(pDX, IDC_PATH, m_Path); ~U;M1>
DDX_Text(pDX, IDC_NUMBER, m_Number); YkN0,6
//}}AFX_DATA_MAP w3n6md
} `49: !M$i
}WowgY
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) c-jE1y<
//{{AFX_MSG_MAP(CCaptureDlg) {PGiNY%q
ON_WM_SYSCOMMAND() zIzL7oD
ON_WM_PAINT() Y)O88C
ON_WM_QUERYDRAGICON() ugu|?z*dI
ON_BN_CLICKED(ID_ABOUT, OnAbout) k)3b0T@b
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2_/H,
ON_BN_CLICKED(ID_CHANGE, OnChange) lXT+OJF
//}}AFX_MSG_MAP >z'T"R/
END_MESSAGE_MAP() yG'
5:
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BOOL CCaptureDlg::OnInitDialog() ^P!(*k#T
{ JT,[;
CDialog::OnInitDialog(); ngt?9i;N
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9ZD>_a
ASSERT(IDM_ABOUTBOX < 0xF000); +^6a$ N
CMenu* pSysMenu = GetSystemMenu(FALSE); MJ\^i4
if (pSysMenu != NULL) euMJ c
{ #Dz. 58A
CString strAboutMenu; 4)Bk:K
strAboutMenu.LoadString(IDS_ABOUTBOX); .5^7Jwh
if (!strAboutMenu.IsEmpty()) 5i0vli/L
{ ]/#3 P
pSysMenu->AppendMenu(MF_SEPARATOR); yI{4h $c
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `o4%UkBpM
} ykS-5E`
} .A Dik}o
SetIcon(m_hIcon, TRUE); // Set big icon "C]v
SetIcon(m_hIcon, FALSE); // Set small icon qo*%S
m_Key.SetCurSel(0); ;hV-*;>
RegisterHotkey(); ,I2x&Ys&.
CMenu* pMenu=GetSystemMenu(FALSE); UfkQG`G9H
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Hk 0RT%PK
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); {3* Ne /
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); r`\6+ Ntb.
return TRUE; // return TRUE unless you set the focus to a control d)WGI
RUx
} D7lRZb
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void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) H5eGl|Z5]^
{ H3xMoSs
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
O`^dy7>{U
{ vNDf1B5z
CAboutDlg dlgAbout; D_Zt:tzO
dlgAbout.DoModal(); ,%T
sfB
} jtv<{7a
else X:>,3[hx|
{ OTj
J'
CDialog::OnSysCommand(nID, lParam); l9Av@|
} [*K.9}+G_
} wM``vx[/
K^Ho%_)
void CCaptureDlg::OnPaint() grxlGS~Q
{ M:*)l(
if (IsIconic()) u.@B-Pf[Eo
{ x+bC\,q
CPaintDC dc(this); // device context for painting @@3%lr71
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); w }=LC#le
// Center icon in client rectangle pf`vH`r
int cxIcon = GetSystemMetrics(SM_CXICON); XS(Q)\"
int cyIcon = GetSystemMetrics(SM_CYICON); Rn $TYCO
CRect rect; I]-"Tw
GetClientRect(&rect); l+#uQo6cqQ
int x = (rect.Width() - cxIcon + 1) / 2; ?~3Pydrb#
int y = (rect.Height() - cyIcon + 1) / 2; ^2`*1el
// Draw the icon 7o7*g 7
dc.DrawIcon(x, y, m_hIcon); | /X+2K}3
} C <d]0)
else [{q])P;
{ tiPZ.a~k
CDialog::OnPaint(); {U)q)
} yIu_DFq%
} Q"s]<MtdS
Y#zHw<<E
HCURSOR CCaptureDlg::OnQueryDragIcon() RZ0+Uu/J
{ YS bS.tq
return (HCURSOR) m_hIcon; A~@x8
} ^@
Xzh:
] 1s6=
void CCaptureDlg::OnCancel() Xd@ d$
{ v[4-?7-
if(bTray) /^9=2~b
DeleteIcon(); ?/fC"MJq?
CDialog::OnCancel(); 6Zx)L|B
} 97pfMk1_
f<;eNN
void CCaptureDlg::OnAbout() Oh3A?!y#
{ !8I80:e_~
CAboutDlg dlg; !>?*gc.<
dlg.DoModal(); VQI[J
} &3|l4R\
PQrc#dfc|
void CCaptureDlg::OnBrowse() "XLFw;o
{ O$7r)B6Cs
CString str; VKcVwq
BROWSEINFO bi; r<[G~n
char name[MAX_PATH]; hf:\^w
ZeroMemory(&bi,sizeof(BROWSEINFO)); T*%O\&'r
bi.hwndOwner=GetSafeHwnd(); Z=beki]
bi.pszDisplayName=name; =J`M}BBx
bi.lpszTitle="Select folder"; D$Ao-6QE
W
bi.ulFlags=BIF_RETURNONLYFSDIRS; bR<XQHl
LPITEMIDLIST idl=SHBrowseForFolder(&bi); fwi
-
if(idl==NULL) %-L
T56T
return; c6cB
{/g
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); MDoV84Fh
str.ReleaseBuffer(); t]hfq~Ft
m_Path=str; [ZL<Q
if(str.GetAt(str.GetLength()-1)!='\\') t8ORfO+
m_Path+="\\"; Prrz>
UpdateData(FALSE); _ZE&W
} ;!B,P-Z"g
bb}Fu/S
void CCaptureDlg::SaveBmp() xk7VuS*
{ \;1nEjIA
CDC dc; 'yR\%#s6
dc.CreateDC("DISPLAY",NULL,NULL,NULL); )
D5JA`
CBitmap bm; $U"pdf
int Width=GetSystemMetrics(SM_CXSCREEN); W)AfXy
int Height=GetSystemMetrics(SM_CYSCREEN); :)F0~Q
bm.CreateCompatibleBitmap(&dc,Width,Height);
y$9XHubu
CDC tdc; yeLd,M/I
tdc.CreateCompatibleDC(&dc); S;tvt/\!Z
CBitmap*pOld=tdc.SelectObject(&bm); _FkH;MG WS
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); IM_SZs
tdc.SelectObject(pOld); pp+z5
BITMAP btm; _adW>-wQ!d
bm.GetBitmap(&btm); Y/f8rN
DWORD size=btm.bmWidthBytes*btm.bmHeight; Z fd `Fu
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); v,Z?pYYo
BITMAPINFOHEADER bih; x b!&'cw
bih.biBitCount=btm.bmBitsPixel; a28`)17z
bih.biClrImportant=0; [&)*jc16
bih.biClrUsed=0; @+sYwlA~
bih.biCompression=0; BD [<>Wm
bih.biHeight=btm.bmHeight; s8;*Wt
bih.biPlanes=1; 7w}]9wCN?
bih.biSize=sizeof(BITMAPINFOHEADER); "(iQ-g Mm
bih.biSizeImage=size; juQ?k xOB
bih.biWidth=btm.bmWidth; yJdkDVxYr
bih.biXPelsPerMeter=0; h*?]A
bih.biYPelsPerMeter=0; fs2y$HN
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); w&
)ApfL
static int filecount=0; i^)JxEPr w
CString name; KB$Y8[
name.Format("pict%04d.bmp",filecount++); Qp-P[Tc
name=m_Path+name; ,"5xKF+cS
BITMAPFILEHEADER bfh; !?z"d
bfh.bfReserved1=bfh.bfReserved2=0; cRWYS[O?-
bfh.bfType=((WORD)('M'<< 8)|'B'); Pu(kCH{
bfh.bfSize=54+size; ;Q<2Y#
bfh.bfOffBits=54; v!#koqd1y.
CFile bf; _$yS4= .
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @v/
8}n
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); |$[.X3i
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); e\}'i-
bf.WriteHuge(lpData,size); \)cbg#v
bf.Close(); {6mFI1;q
nCount++; @DKph!cr
} x??H%'rP
GlobalFreePtr(lpData); ~BgNMO;|
if(nCount==1) \^dYmU
m_Number.Format("%d picture captured.",nCount); 0U!_ o2]
else TVK*l*
m_Number.Format("%d pictures captured.",nCount); >0cg
UpdateData(FALSE); ]Aj5 K
} ]'<"qY
EME}G42KN
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) |N|[E5Cn
{ - H`,`#{
if(pMsg -> message == WM_KEYDOWN) j rg B56LL
{ OpmPw4?}
if(pMsg -> wParam == VK_ESCAPE) OG^#e+
return TRUE; ZeH=]G4Zv7
if(pMsg -> wParam == VK_RETURN) ^2nH6,LPS
return TRUE; %-an\.a.
} q*}$1 zb
return CDialog::PreTranslateMessage(pMsg); "5"{~3Gw^
} HBZtg
5>-~!Mg1
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) " ,]A.,
{ #KDN
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ tdNAR|
SaveBmp(); {m"I-VF
return FALSE; w}?,N
} 1~S''[
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 0NXaAf:2Z
CMenu pop; '\P+Bu]6&
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [6%y RQ_
CMenu*pMenu=pop.GetSubMenu(0); ?+L7Bd(EF%
pMenu->SetDefaultItem(ID_EXITICON); Mlo:\ST|
CPoint pt; +<3e@s&
GetCursorPos(&pt); ?Skv2!X|
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); _8wT4|z5
if(id==ID_EXITICON) .K+5k`kd
DeleteIcon(); *rC%nmJwk!
else if(id==ID_EXIT) 7=HpEc
OnCancel(); BX2}ar
return FALSE; FLQ^J3A,I
} _r`(P#Hy
LRESULT res= CDialog::WindowProc(message, wParam, lParam); dZAb':
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) W 7w*VD|
AddIcon(); _3{8Zg
return res; r|3<UR%
} 3u'@anre
F
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void CCaptureDlg::AddIcon() 9Yji34eDZ
{ k"+/DK,:
NOTIFYICONDATA data; *enT2Q
data.cbSize=sizeof(NOTIFYICONDATA);
CL5t6D9Qi
CString tip; 5oR)
tip.LoadString(IDS_ICONTIP); C <H$}f
data.hIcon=GetIcon(0); zS `>65}e
data.hWnd=GetSafeHwnd(); > (W\Eh{J
strcpy(data.szTip,tip); E :UJ"6
data.uCallbackMessage=IDM_SHELL; j:0<
tjE
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ZSn6JV'g
data.uID=98; )_K:A(V>
Shell_NotifyIcon(NIM_ADD,&data); X`7O%HiX/`
ShowWindow(SW_HIDE); Hm_&``='
bTray=TRUE; =j8g6# 'u
} uy([>8uu
p%5(Qqmlk
void CCaptureDlg::DeleteIcon() p+Fh9N<F9
{ UbP$WIrq
NOTIFYICONDATA data; ;e Mb$px
data.cbSize=sizeof(NOTIFYICONDATA);
WDh*8!)
data.hWnd=GetSafeHwnd(); H4BuxM_r
data.uID=98; +[#^c3x2
Shell_NotifyIcon(NIM_DELETE,&data); fAD
{sg
ShowWindow(SW_SHOW); (n2=.9k!
SetForegroundWindow(); [L?WM>]%
ShowWindow(SW_SHOWNORMAL); q ;e/gP2
bTray=FALSE; @Dd3mWKq
} 1+Bj` ACP
YGZa##i
void CCaptureDlg::OnChange() !uhh_3RH
{ &izk$~
RegisterHotkey(); 8zpTCae^=7
} `'ak/%Krh
$
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BOOL CCaptureDlg::RegisterHotkey() xS_tB)C
{ ;eP.B/N
UpdateData(); nDXy$f8
UCHAR mask=0; Su k;##I
UCHAR key=0; |q 0iX2W
if(m_bControl) qO>A6
mask|=4; vcSb:('
if(m_bAlt) MwWN;_#EO)
mask|=2; NZuylQ)0
if(m_bShift) ":L d}~>
mask|=1; Ar`U/ %Cu
key=Key_Table[m_Key.GetCurSel()]; BsYJIKfW
if(bRegistered){ s+a#x(7{
DeleteHotkey(GetSafeHwnd(),cKey,cMask); tS[@?qP
bRegistered=FALSE; 1pTQMf a
} J!iKW
cMask=mask;
bRx}ih
cKey=key; }SGb`l
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); n;r
W
return bRegistered; HG)h,&nc-
} 8b $e)
1Pd2%
四、小结 l6T5]$
?8$h%Ov-
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。