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:
K+D`U6&
UfEF>@0 一、实现方法
Vh:%e24Z \cdNyVY 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:
%_wX9ZT 2l#Ogn`k #pragma data_seg("shareddata")
MJJy
mi'b HHOOK hHook =NULL; //钩子句柄
SUXRWFl UINT nHookCount =0; //挂接的程序数目
T^8t<S@` static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
{T
Z7>k static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
V+X>t7.Q static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
2JZf@x+} static int KeyCount =0;
;}{%|UAsx static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
V?v,q'? $ #pragma data_seg()
C`3}7qi|C #CoJ S[t 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。
"#2z
'J S*6P=O* 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:
1Tf"<Dp pGz-5afL BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
sB
]~=vUP cKey,UCHAR cMask)
kC"<4U {
Uu{I4ls6B BOOL bAdded=FALSE;
6)m}e?D> for(int index=0;index<MAX_KEY;index++){
t5#IiPp if(hCallWnd[index]==0){
Z VuHO7' hCallWnd[index]=hWnd;
IpmblC4 HotKey[index]=cKey;
>v @R]9 HotKeyMask[index]=cMask;
wxXp(o( bAdded=TRUE;
S1{UVkr KeyCount++;
PD12gUU? break;
1FUadSB5) }
HcA;'L?Dw }
9@
6y(#s return bAdded;
)_OKw?Zi }
z%;b-PpS //删除热键
gmy$_4+6o BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
F0%FX`b{{ {
1`N q
K BOOL bRemoved=FALSE;
}3F8[Td.~N for(int index=0;index<MAX_KEY;index++){
FyX\S= if(hCallWnd[index]==hWnd){
4mJ4) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
~`c?&YixU hCallWnd[index]=NULL;
+~\1Zgw HotKey[index]=0;
Ln0rm9FV- HotKeyMask[index]=0;
|ul25/B
B bRemoved=TRUE;
Mo|[Muj8b KeyCount--;
d0~F|j\# break;
7y:%^sl }
[f}YXQ0N) }
n1`D:XrE }
W~E%Eq3 return bRemoved;
VS<E?JnbFV }
[s$vY~_ ,qV8(`y_ pi:%Bd&F DLL中的钩子函数如下:
7udMF3;> 4bqi&h3 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Juj"cjob {
\ Q<c Y< BOOL bProcessed=FALSE;
a:Jsi= if(HC_ACTION==nCode)
oCdWf63D {
b;# 3X) if((lParam&0xc0000000)==0xc0000000){// 有键松开
wl #Bv,xf switch(wParam)
5G cdz {
:zZK%}G< case VK_MENU:
wq!Gj]B MaskBits&=~ALTBIT;
?9nuL}m!a break;
$5ZBNGr case VK_CONTROL:
6U6,Wu MaskBits&=~CTRLBIT;
YU.aZdA&V3 break;
%KK6}d# case VK_SHIFT:
{A]"/AC MaskBits&=~SHIFTBIT;
72R|zR break;
ik)T>rYg0 default: //judge the key and send message
N|5J-fR& break;
6= s!~ }
#z_lBg. K for(int index=0;index<MAX_KEY;index++){
>&3M
#s(w if(hCallWnd[index]==NULL)
fy" q continue;
g-"@%ps if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
x zu)``? {
VVO C-: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
P:vAU8d> bProcessed=TRUE;
{/G~HoY1i }
)WavG1 }
4;'o`K~* }
Aq%TZ_m else if((lParam&0xc000ffff)==1){ //有键按下
__M(dN(^ switch(wParam)
+<7~yZ[Z8 {
u )PB@ case VK_MENU:
#4iSQ$0 MaskBits|=ALTBIT;
^JZ ]?iny break;
@ofivCc<% case VK_CONTROL:
.6aC2A]es MaskBits|=CTRLBIT;
n@ lf+
break;
3ha^NjE case VK_SHIFT:
kx0(v1y3gT MaskBits|=SHIFTBIT;
S[(Tpk2_ break;
|;e K5(| default: //judge the key and send message
H)z}6[` break;
4Ra }
LgXc}3 for(int index=0;index<MAX_KEY;index++){
TeaP\a if(hCallWnd[index]==NULL)
Q.X)QCp#r continue;
b{JcV if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|`[0U {
,Bax0p SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
tIfA]pE bProcessed=TRUE;
ekC
1wN
l }
AL@8v= }
QG
{KEj2V }
\Fg%V> if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
dPZrX{ c for(int index=0;index<MAX_KEY;index++){
NQ~keN if(hCallWnd[index]==NULL)
5e=9~].7 continue;
Hy=';Ccn} if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
7pf]h$2 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-L&r2RF/ //lParam的意义可看MSDN中WM_KEYDOWN部分
K}7E;O5m" }
koDIxj'%X }
x6Zhw9RV }
v&Xsyb0CaM return CallNextHookEx( hHook, nCode, wParam, lParam );
"=<T8M }
LG3D3{H(. j=b?WNK 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
8AL`<8$ /vC|_G|{ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
{2"8^; BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
J=?`~?Vbo 7u7`z% 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:
B8A-|S!,U D! TFb E LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
&zkuL {
%gUf if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
HZ%2WM {
-Uj)6PzGu //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
?5'E P|< SaveBmp();
lz1RAp0R" return FALSE;
"LZQ1P*ef$ }
Bv-|#sdxm …… //其它处理及默认处理
I!sh+e }
} )DE ZcJa: b7-M'-Km0_ 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。
;;>hWAS rywui10x* 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。
pUbf]3 t L_4c~4 二、编程步骤
; '6`hZ WEy$SN+P 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
E%Tpby}^' 4-j3&( 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
24{Tl
q3 -DAkVFsN 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
xib?XzxGo !@>_5p>q* 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
Vx'82CIC b;Nm$`2 5、 添加代码,编译运行程序。
U-^qVlw vVvx g0 三、程序代码
_{Z!$q6, `Xs3^FJt ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
l$[7pM[ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
lL8pIcQW #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
rK` x< #if _MSC_VER > 1000
P ?^h #pragma once
SXqWq #endif // _MSC_VER > 1000
FR*CiaD1 #ifndef __AFXWIN_H__
&~4;HjS #error include 'stdafx.h' before including this file for PCH
}+mIP:T #endif
r_R(kns #include "resource.h" // main symbols
xA7>";sla[ class CHookApp : public CWinApp
,s ` y {
vbA<=V*P public:
Kd='l~rby CHookApp();
"Y'MuV'x // Overrides
5;v_?M!UCK // ClassWizard generated virtual function overrides
nR%ey" //{{AFX_VIRTUAL(CHookApp)
J[|4`GT public:
&,DZ0xA virtual BOOL InitInstance();
dw*PjIB9x virtual int ExitInstance();
UTWchh //}}AFX_VIRTUAL
Tumv0=q4wd //{{AFX_MSG(CHookApp)
"mk@p=d // NOTE - the ClassWizard will add and remove member functions here.
?Z^?A^; }$ // DO NOT EDIT what you see in these blocks of generated code !
{beu //}}AFX_MSG
D;1?IeS DECLARE_MESSAGE_MAP()
90"&KDh };
|.#G G7F^S LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
nj1TX BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
I8x,8}o>V BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
w]@H]>sHd BOOL InitHotkey();
(r6'q0[ BOOL UnInit();
Aj{c s #endif
CJa`[;i0y og[cwa_ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
% _.kd" #include "stdafx.h"
*;ehSg9 #include "hook.h"
xF8U )j! #include <windowsx.h>
d/&W[jJ #ifdef _DEBUG
a^vTBJXo #define new DEBUG_NEW
s!IX3rz #undef THIS_FILE
APgjT';P^ static char THIS_FILE[] = __FILE__;
NZb}n`: #endif
"1P[D'HV4| #define MAX_KEY 100
AONEUSxJ #define CTRLBIT 0x04
:
Iq #define ALTBIT 0x02
A4~-{.w= #define SHIFTBIT 0x01
|l-~,eRvi5 #pragma data_seg("shareddata")
8NZQTRdH HHOOK hHook =NULL;
J#'8]p3E UINT nHookCount =0;
}AW"2<@ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Y+d+ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
OA7YWk<K static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
*SK`&V static int KeyCount =0;
5FJ(x:k?z static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
eG_@WLxwD #pragma data_seg()
=?3b3PZn HINSTANCE hins;
IRknD3LX void VerifyWindow();
u~xfI[8C BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
;!hwcO kX //{{AFX_MSG_MAP(CHookApp)
[%c5MQ?H // NOTE - the ClassWizard will add and remove mapping macros here.
H:#sf][&,L // DO NOT EDIT what you see in these blocks of generated code!
!kxJ&VmeF //}}AFX_MSG_MAP
;;|o+4Ob; END_MESSAGE_MAP()
$ucDzf=o PyoIhe&ep CHookApp::CHookApp()
H/2dVUU {
| LXVf // TODO: add construction code here,
;7>k[?'e // Place all significant initialization in InitInstance
NNxzZ!q! }
<GWzdj? n\i~H CHookApp theApp;
pi|=3W LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
1 2VSzIm {
S[;d\Z]~ BOOL bProcessed=FALSE;
}`pxs if(HC_ACTION==nCode)
oh0*b h {
^O3i)GO if((lParam&0xc0000000)==0xc0000000){// Key up
p:NIRs switch(wParam)
GYt|[GC {
)61X,z case VK_MENU:
/ q| o MaskBits&=~ALTBIT;
h'nXV{N0 break;
8B`w!@hf case VK_CONTROL:
Fhrj$ MaskBits&=~CTRLBIT;
,p>@:C/M break;
0z$::p$%u case VK_SHIFT:
i+Lqj MaskBits&=~SHIFTBIT;
`m`Y3I break;
`%/w0,0 default: //judge the key and send message
G,}"}v: break;
Y 8n*o3jM }
R=J5L36F for(int index=0;index<MAX_KEY;index++){
@~QI3)=s if(hCallWnd[index]==NULL)
?j;,:n continue;
~f:"Q(f+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
+>ld {
{%oxzdPc SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
DJZ$M bProcessed=TRUE;
udOdXz6K? }
- i#Kpf }
ny"z<N&}/ }
MwC} else if((lParam&0xc000ffff)==1){ //Key down
x#XxD<y switch(wParam)
G ?Hx"3:? {
5uX-onP\[ case VK_MENU:
W6s-epsRmT MaskBits|=ALTBIT;
gW-mXb break;
/PKu",Azj case VK_CONTROL:
LC4W?']/ MaskBits|=CTRLBIT;
$-p9cyk break;
feJl[3@tO case VK_SHIFT:
!'#GdRstv MaskBits|=SHIFTBIT;
@\WeI"^F8 break;
||))gI`3a default: //judge the key and send message
#}lWM%9Dy break;
|s,y/svp }
K: |-s4= for(int index=0;index<MAX_KEY;index++)
h])oo:u'/Q {
-%dBZW\u2 if(hCallWnd[index]==NULL)
a%2K,.J continue;
bao"iv~z if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
FeNNzV= {
qfX26<q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
"QvTn= bProcessed=TRUE;
N F,<^ u }
CiV^bYi }
^ib
=fLu }
r=/$}l4 if(!bProcessed){
iS< ^MD for(int index=0;index<MAX_KEY;index++){
F1t+D)KA> if(hCallWnd[index]==NULL)
)O2IEwPd. continue;
#||D,[ _=+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Jflm-Hhsf SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
J|w%n5Y }
8O_yZ
~Z4 }
Us.k, }
Ae%AG@L return CallNextHookEx( hHook, nCode, wParam, lParam );
&`,Y/Cbw }
@*E=O | Sf*gAwnW BOOL InitHotkey()
Q
ZC\%X8j {
(^"2"[?a if(hHook!=NULL){
lPD&Doa nHookCount++;
y'!"GrbZ return TRUE;
uvAJJIae' }
DkSs^ym else
=Qf{ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
?G<ISiABQC if(hHook!=NULL)
sDY+J(Z nHookCount++;
4Y{;%;-i return (hHook!=NULL);
[C\B2iU7_M }
91-[[< BOOL UnInit()
4hxa|f {
iuA_Jr if(nHookCount>1){
<I#M^}` nHookCount--;
+`iJ+ return TRUE;
((&5F!+\- }
CDPu(,^ BOOL unhooked = UnhookWindowsHookEx(hHook);
+i#s |kKs\ if(unhooked==TRUE){
}>EWFE` nHookCount=0;
H:P7G_!\ hHook=NULL;
K)
Ums-b }
!L@<?0xLW return unhooked;
Bg] % }
Ylyk/ xS:n BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
0cDP:EzR; {
RL)~J4Y BOOL bAdded=FALSE;
8rjD1< for(int index=0;index<MAX_KEY;index++){
tyWDa$u,u if(hCallWnd[index]==0){
d0i|^ hCallWnd[index]=hWnd;
7%W1M@ HotKey[index]=cKey;
;!C_}P HotKeyMask[index]=cMask;
+&dkJ 4g[ bAdded=TRUE;
h?H|)a<^9 KeyCount++;
$wn0oIuW break;
[k0/ZfFwV }
vvu $8n }
M ziOpraj return bAdded;
Wffz&pR8
}
&E1m{gB( 7#c4.9b? BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
N}1yDN {
.
:>e"D BOOL bRemoved=FALSE;
#WJ*)$A@& for(int index=0;index<MAX_KEY;index++){
1{wbC) if(hCallWnd[index]==hWnd){
ef)zf+o if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
]G
D`
f hCallWnd[index]=NULL;
\ @[Q3.VX HotKey[index]=0;
|fW_9={1kQ HotKeyMask[index]=0;
kv6nVlI)B bRemoved=TRUE;
.wmqaLd% KeyCount--;
&YcOmI/MM
break;
N:okt)q:% }
cRuN; }
B,&QI&k`~ }
y=.bn!u}z return bRemoved;
J .VZD }
A2;6Vz=z G')zDx void VerifyWindow()
}'fa f{W {
Yg,;l-1 for(int i=0;i<MAX_KEY;i++){
c&x1aF "B if(hCallWnd
!=NULL){ 74a@/'WbE
if(!IsWindow(hCallWnd)){ ky-nP8L}
hCallWnd=NULL; 9e c},~(
HotKey=0; =R~zD4{"
HotKeyMask=0; 2gZ nrU
KeyCount--; Dx`-h#
} 0AdxV?6z
} Fi;H
} ^8A[
^cgq
} !%D';wQ,/
! nvg:$.&
BOOL CHookApp::InitInstance() x}nBUq:
{ @g4o8nH}
AFX_MANAGE_STATE(AfxGetStaticModuleState()); *nHuGla
hins=AfxGetInstanceHandle(); 3!osQ1
InitHotkey(); {ya.
return CWinApp::InitInstance(); pkae91
} ji
./m8(
G~v:@
int CHookApp::ExitInstance() ~;a\S3
{ HsUh5;
VerifyWindow(); @K+gh#
UnInit(); uo J0wG.
return CWinApp::ExitInstance(); IM7<z,* oF
} D7T|K :F)
E>f{j:M
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file EFljUT?&
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) K5|~iW'
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ )XGz#C_P
#if _MSC_VER > 1000 lgS7;
#pragma once 1Y J?Y
#endif // _MSC_VER > 1000 biU_ImJ>0
|Tc4a4 jS
class CCaptureDlg : public CDialog zL9~gJ
{ $+_1F`
// Construction fK+
5
public: y`j=(|DV
BOOL bTray; 'vZIAnB8
BOOL bRegistered; \~z$'3H`
BOOL RegisterHotkey(); LiV&47e*>
UCHAR cKey; jx}'M$TA
UCHAR cMask; Kx&"9g$
void DeleteIcon(); 4xr^4\lk
void AddIcon(); JO0o@M5H
UINT nCount; E:ci/09wD
void SaveBmp(); Ul9^"o
CCaptureDlg(CWnd* pParent = NULL); // standard constructor K%+4M#jj5
// Dialog Data W dD889\
//{{AFX_DATA(CCaptureDlg) op5`#{
enum { IDD = IDD_CAPTURE_DIALOG }; >e
R^G5rn;
CComboBox m_Key; W.kcN,
BOOL m_bControl; !5C"`@}q>
BOOL m_bAlt; 2dkWzx
BOOL m_bShift; j&_>_*.y
CString m_Path; } `Ya;
CString m_Number; rU&Y/
//}}AFX_DATA =CRptk6tS
// ClassWizard generated virtual function overrides b<~-s sL7a
//{{AFX_VIRTUAL(CCaptureDlg) bTmhz
public: nEd
"~
virtual BOOL PreTranslateMessage(MSG* pMsg); R"V90b Cf
protected: *bf 5A9
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <{Y3}Q
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); NRJp8G Z%U
//}}AFX_VIRTUAL DE?k|Get2
// Implementation 3CjixXaA$
protected: aG^E^^Y
HICON m_hIcon; v9-4yZU^WR
// Generated message map functions
IPK1g3Z
//{{AFX_MSG(CCaptureDlg) xh$yXP0/
virtual BOOL OnInitDialog(); vm_]X{80;
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); W/xPVmnV
afx_msg void OnPaint(); S-q"'5>
afx_msg HCURSOR OnQueryDragIcon(); t#|R"Q#
virtual void OnCancel(); CvE^t#Bok
afx_msg void OnAbout(); *c[w9(fU
afx_msg void OnBrowse(); 8| =C/k
afx_msg void OnChange(); 9!Q ZuZY
//}}AFX_MSG x@Z{5w_a
DECLARE_MESSAGE_MAP() #f24a?n|
}; Wn+s:ov
#endif #eOHe4Vt
,^8':X"A{!
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `1(ED= |
#include "stdafx.h" _Ffg"xoC
#include "Capture.h" "WQ6[;&V
#include "CaptureDlg.h" [B;okW
#include <windowsx.h> t-KicLr
#pragma comment(lib,"hook.lib")
_$c o Y
#ifdef _DEBUG .,xyE--;d
#define new DEBUG_NEW 3kC|y[.&
#undef THIS_FILE x4c|/}\)*
static char THIS_FILE[] = __FILE__; aYT!xdCI
#endif ~LpkA`Hn!
#define IDM_SHELL WM_USER+1 \DS*G7.A+&
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Lk,q~
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); SDO:Gma
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 'LPyh ;!f
class CAboutDlg : public CDialog te-xhJ&K
{ (9I(e^@]
public: q9rm9#}[J#
CAboutDlg(); FsJk"$}
// Dialog Data 3`%E;?2
//{{AFX_DATA(CAboutDlg) n4S`k%CI
enum { IDD = IDD_ABOUTBOX }; xw}yl4WT{
//}}AFX_DATA .Ji9j[[#D
// ClassWizard generated virtual function overrides h>D;QY
//{{AFX_VIRTUAL(CAboutDlg) trwQ@7
protected: EA>.SSs!
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JS^DyBXc
//}}AFX_VIRTUAL G`O*AQ}[
// Implementation rP7
QW)NF
protected: c86KDEF
//{{AFX_MSG(CAboutDlg) uq s
//}}AFX_MSG
9)W3\I>U-
DECLARE_MESSAGE_MAP() lr~
|=}^
}; "/e)v{
,zM@)Q;9
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) >dJuk6J&c&
{ VqW5VLa
//{{AFX_DATA_INIT(CAboutDlg) ">.k 6Q
//}}AFX_DATA_INIT :Q=y'<
} Hq::F?
[?I<$f"
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "[?DS
{ AJEbiP
CDialog::DoDataExchange(pDX); igA?E56?
//{{AFX_DATA_MAP(CAboutDlg) NT5=%X]
//}}AFX_DATA_MAP I*.nwV<
} :Q("
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) E|c(#P{
//{{AFX_MSG_MAP(CAboutDlg) 1k4\zVgi
// No message handlers %_5#2a
//}}AFX_MSG_MAP 7yyX8p>
END_MESSAGE_MAP() =hvPq@C%
9n\>Yieu
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) S!u8JG1
: CDialog(CCaptureDlg::IDD, pParent) 6WZffB{-TK
{ -V6caVlg
//{{AFX_DATA_INIT(CCaptureDlg) [%bGs1U
m_bControl = FALSE; OgIRI8L
m_bAlt = FALSE; GD.Ss9_h1
m_bShift = FALSE; }Mt)57rU
m_Path = _T("c:\\"); 0)d='3S
m_Number = _T("0 picture captured."); _LwF:19Il
nCount=0; \;~Nj#
bRegistered=FALSE; LEPLoF3,
bTray=FALSE; *4%pXm;
//}}AFX_DATA_INIT zw15r" R
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 '4i8&p`/
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Cwls e-
} P*iC#w]m
bI:W4y>I=
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 5e,u*J]
{ |3e+ K.
CDialog::DoDataExchange(pDX); l%_K$$C
//{{AFX_DATA_MAP(CCaptureDlg) K:'^f? P
DDX_Control(pDX, IDC_KEY, m_Key); ugTsI~aE
DDX_Check(pDX, IDC_CONTROL, m_bControl); E5rV}>(Y
DDX_Check(pDX, IDC_ALT, m_bAlt); fV>d_6Lf}
DDX_Check(pDX, IDC_SHIFT, m_bShift); oMg-.!6
DDX_Text(pDX, IDC_PATH, m_Path); Gl'G;F$Y-
DDX_Text(pDX, IDC_NUMBER, m_Number); W/BPf{U
//}}AFX_DATA_MAP ;]grbqXVE
} :5CyR3P
o-H?q!
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) v%T'!(0j/
//{{AFX_MSG_MAP(CCaptureDlg) a r8iuwfZ
ON_WM_SYSCOMMAND() gyAJ#N|
ON_WM_PAINT() [G$ #jUt/O
ON_WM_QUERYDRAGICON() Rmmu#-{Y
ON_BN_CLICKED(ID_ABOUT, OnAbout) \O "`o4
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) .o`Io[io
ON_BN_CLICKED(ID_CHANGE, OnChange) p*0[:/4
//}}AFX_MSG_MAP WC<[<uI*
END_MESSAGE_MAP() SZe55mK `
;@qS#7SRB
BOOL CCaptureDlg::OnInitDialog() >Vt2@Ee
{ rz_W]/G-P
CDialog::OnInitDialog(); \7b, Mz!
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); [k%hl`}
ASSERT(IDM_ABOUTBOX < 0xF000); Wj,s/Yr:
CMenu* pSysMenu = GetSystemMenu(FALSE); R&Nl!QTJj
if (pSysMenu != NULL) H@@ 4n%MK
{ \B~g5}=
CString strAboutMenu; 7u&l]NC?y
strAboutMenu.LoadString(IDS_ABOUTBOX); Hh;lT
if (!strAboutMenu.IsEmpty()) Lq>lj`>
{ q]OIP"yv
pSysMenu->AppendMenu(MF_SEPARATOR); I{dy,\p
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); j36YIz$a
} Z}!'fX."
} x @q.u3o9
SetIcon(m_hIcon, TRUE); // Set big icon ZS=H1
SetIcon(m_hIcon, FALSE); // Set small icon k)7i^1U
m_Key.SetCurSel(0); 7oF3^K'S
RegisterHotkey(); {Cm!5Q Yy
CMenu* pMenu=GetSystemMenu(FALSE); 03 gbcNo
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 50Gr\
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); '(B -{}l
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~wuCa!!A
return TRUE; // return TRUE unless you set the focus to a control EQlb:;j
} \54B
&Iy5@8
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) RBf#5VjOG!
{ FCNYfjB%
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 5n2!Y\
{ C lf;+G0
CAboutDlg dlgAbout; {H[N|\
dlgAbout.DoModal(); 7d>w]R,Z
} nE8z1hBUq
else 6vbKKn`ST
{ 1ygEyC[1
CDialog::OnSysCommand(nID, lParam); G(wK(P0j
} BH {z]a
}
:'F,l:
,zx{ RDI
void CCaptureDlg::OnPaint() B,%6sa~I
{ 2fr%_GNu
if (IsIconic()) h +B7BjA>G
{ Rw0|q
CPaintDC dc(this); // device context for painting <J+Oh\8tad
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); id9QfJ9t
// Center icon in client rectangle G3TS?u8Q
int cxIcon = GetSystemMetrics(SM_CXICON); dT'}:2
int cyIcon = GetSystemMetrics(SM_CYICON); *B!Ox}CI.L
CRect rect; w>f.@luO4
GetClientRect(&rect); C <:g"F:k
int x = (rect.Width() - cxIcon + 1) / 2; lfM vNv
int y = (rect.Height() - cyIcon + 1) / 2; |
CFG<]
// Draw the icon y%%VJ}'X!
dc.DrawIcon(x, y, m_hIcon); >gzM-d
} [ ?7QmZK
else m
uO.
{ {2:baoG-
CDialog::OnPaint(); ?aTH<
} nD/B:0'
} c\o_U9=n
w~Q\:<x&~Z
HCURSOR CCaptureDlg::OnQueryDragIcon() Sc{&h8KMTb
{ DDkN3\w
return (HCURSOR) m_hIcon; 1(Vv-bq$
} </_QldL_
,H6P%
void CCaptureDlg::OnCancel() j%`
C
{ @uyQH c,V
if(bTray) &q|vvF<G
DeleteIcon(); W[J2>`k9
CDialog::OnCancel(); 0-uj0"r`
} wry`2_c
s3A(`heoq
void CCaptureDlg::OnAbout() 9U<WR*H
{ S>x@9$( ym
CAboutDlg dlg; "vybVWEE
dlg.DoModal(); Ux',ma1JK
} [/hoNCH!
WDxcV%
void CCaptureDlg::OnBrowse() yWZ_
{ kXhd]7ru
CString str; `TO Xktj
BROWSEINFO bi; 6
DQOar>d
char name[MAX_PATH]; [7.Num_L
ZeroMemory(&bi,sizeof(BROWSEINFO)); ek5j;%~g1
bi.hwndOwner=GetSafeHwnd(); _$T
!><)y
bi.pszDisplayName=name; qfT9g>EF
bi.lpszTitle="Select folder"; c}OveR$'&
bi.ulFlags=BIF_RETURNONLYFSDIRS; }Jh.+k|_
LPITEMIDLIST idl=SHBrowseForFolder(&bi); a K6dy\
if(idl==NULL) a7_Q8iMe
return; r>8`gAhx
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Y~*p27@fR
str.ReleaseBuffer(); oO[eer_S-
m_Path=str; qmpT G:+
if(str.GetAt(str.GetLength()-1)!='\\') AoGpM,W]5
m_Path+="\\"; _hV34:1F
UpdateData(FALSE); _)vX_gCi
} KF
*F
4Wz1O$*
void CCaptureDlg::SaveBmp() pSQ2wjps
{ qdk!.A{
CDC dc; Vr1r2G2
dc.CreateDC("DISPLAY",NULL,NULL,NULL); bl!pKOY
CBitmap bm; l5^Q
int Width=GetSystemMetrics(SM_CXSCREEN); Yl au
int Height=GetSystemMetrics(SM_CYSCREEN); W<&/5s
bm.CreateCompatibleBitmap(&dc,Width,Height); xp:I(
CDC tdc; %6lGRq{/?
tdc.CreateCompatibleDC(&dc); uHquJQ4
CBitmap*pOld=tdc.SelectObject(&bm); YYI0iM>
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >,zU=I?9Y
tdc.SelectObject(pOld); $Xo_8SX,
BITMAP btm; FP{=b/
bm.GetBitmap(&btm); MbYgGE,LA
DWORD size=btm.bmWidthBytes*btm.bmHeight; AiR#:r
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [YlRz
BITMAPINFOHEADER bih; BPW.&2?<
bih.biBitCount=btm.bmBitsPixel; V+sZ;$
bih.biClrImportant=0; nO6UlY
bih.biClrUsed=0; 2va[= >_
bih.biCompression=0; p?Ux1S
bih.biHeight=btm.bmHeight; ]{i0?c
bih.biPlanes=1; =zAFsRoD_B
bih.biSize=sizeof(BITMAPINFOHEADER); ?8grK
bih.biSizeImage=size; ecl6>PS$'
bih.biWidth=btm.bmWidth; M1P;x._n
bih.biXPelsPerMeter=0; cyd_xB5K
bih.biYPelsPerMeter=0; )ty>{t
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); h{HpI
0q4
static int filecount=0; k:/Z6TLk3
CString name; ^`xS|Sq1D
name.Format("pict%04d.bmp",filecount++); ]D@aMC$#
name=m_Path+name; '$yy
BITMAPFILEHEADER bfh; r4FSQ$[9w
bfh.bfReserved1=bfh.bfReserved2=0; FDiDHOR
bfh.bfType=((WORD)('M'<< 8)|'B'); ,^
-%<
bfh.bfSize=54+size; ~,F]~|U7l
bfh.bfOffBits=54; #bGYHN
CFile bf; #r>)A
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ yAGQD[ih
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =?Co<972Z
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Q!-"5PX
bf.WriteHuge(lpData,size); yWc%z6dXC
bf.Close(); Pt-mLINvG
nCount++; :k_)Bh?+
} #Z]Cq0=
GlobalFreePtr(lpData); K7x;/O
if(nCount==1) Pj56,qd>s
m_Number.Format("%d picture captured.",nCount); -
]We|{
else }n^}%GB
m_Number.Format("%d pictures captured.",nCount); _,F\%}
UpdateData(FALSE); MftaT5
} ZrP
8/>
a]V#mF |{
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) K vPLA{
{ H^B,b!5i
if(pMsg -> message == WM_KEYDOWN) 9nO&d(r g
{ _^eA1}3
if(pMsg -> wParam == VK_ESCAPE) PCDvEbpG
return TRUE; 'q/C: Yo
if(pMsg -> wParam == VK_RETURN) w5-^Py
return TRUE; ~
c~j
} P-^-~/>n
return CDialog::PreTranslateMessage(pMsg); Lo[;{A$u
} ='Oxy
(Ww
SisC~
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4,)QV_?
{ # NK{]H$fd
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ #"C*dNAB
SaveBmp(); ~h +B&F+5
return FALSE; =fy.'+
} ]t17= Lr?
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 1G(wESe
CMenu pop; 2,|@a\H
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); G'HLnx}Yi
CMenu*pMenu=pop.GetSubMenu(0); N1n\tA?
pMenu->SetDefaultItem(ID_EXITICON); 5M8
CPoint pt; /f.
,xs!
GetCursorPos(&pt); f~jdN~
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); v+C D{Tc
if(id==ID_EXITICON) e \kR/<L
DeleteIcon(); ](ztb)
else if(id==ID_EXIT) 4Im}!q5;:<
OnCancel(); w3>G3=b
return FALSE; H?ue!5R#L
} (a,`Y.
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Xn!=/<TIVz
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) &$qIJvMiK
AddIcon(); ]/R>nT
return res; *D7oHwDU
} D*HK[_5
)B@&q.2B=
void CCaptureDlg::AddIcon() @X/-p3729
{ z%6egi>
NOTIFYICONDATA data; OWN|W,
data.cbSize=sizeof(NOTIFYICONDATA); %z
@T /
CString tip; "VsS-b^ P
tip.LoadString(IDS_ICONTIP); oY@]&A^ah
data.hIcon=GetIcon(0); m1 p%,
data.hWnd=GetSafeHwnd(); el^<M,7!
strcpy(data.szTip,tip); K^I$05idi
data.uCallbackMessage=IDM_SHELL; )gR3S%Ju
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; {5fq4AA6
data.uID=98; h*
/
Shell_NotifyIcon(NIM_ADD,&data); Ki)hr%UFw
ShowWindow(SW_HIDE); \\"CgH-
bTray=TRUE; .=
8Es#
} >\5ZgC
uMC0XE|S
void CCaptureDlg::DeleteIcon() z8};(I>)
{ yg4ILL
NOTIFYICONDATA data; G_5NS<JE"S
data.cbSize=sizeof(NOTIFYICONDATA); +A_jm!tJS(
data.hWnd=GetSafeHwnd(); 1@<>GDB9
data.uID=98; B7'2@+(
Shell_NotifyIcon(NIM_DELETE,&data); *EtC4sP
ShowWindow(SW_SHOW); Gg7ZSB 7
SetForegroundWindow(); Hp
fTuydU
ShowWindow(SW_SHOWNORMAL); %ZlnGr
bTray=FALSE; y2C/DyuAY|
} 5_L43-
o{|
|Ig
void CCaptureDlg::OnChange() MD+eLA7
{ k#@)gL
RegisterHotkey(); %bnjK#o"Q
} ;u%4K$
JAL"On#c#0
BOOL CCaptureDlg::RegisterHotkey() Ly/5" &HD
{ 'ka"0~:NS{
UpdateData(); st CFLYox
UCHAR mask=0; yD ur9Qd6
UCHAR key=0; lzZ=!dG
if(m_bControl) 5g4c1K
mask|=4; jmnrpXaAx
if(m_bAlt) jRdW=/q+(
mask|=2; U09@pne8
if(m_bShift) RKz _GEH)
mask|=1; y|D-W>0cX3
key=Key_Table[m_Key.GetCurSel()]; `VOLw*Ci
if(bRegistered){ ]JHY(H2|
DeleteHotkey(GetSafeHwnd(),cKey,cMask); "6
bRegistered=FALSE; 'seuO!5
} -(.\> F
cMask=mask; -_Iuvw
cKey=key; O$peCv
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); S>?B)
return bRegistered; *WXqN!:
} %u$dN9cw
nHF
四、小结 Jc9^Hyqu&
$2*&\/;-E!
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。