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:
^lvYj
E
x)}.@\&% 一、实现方法
&JUHm_wd&S fI<|]c}P&J 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:
1Jm'9iy3 E^s<5BC; #pragma data_seg("shareddata")
o,NTIh HHOOK hHook =NULL; //钩子句柄
, B90r7K: UINT nHookCount =0; //挂接的程序数目
s8:-*VR9 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
P55QE+B static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
[k~}Fe)x static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
;bYS#Bid{V static int KeyCount =0;
qQN|\u+co static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
%m/W4Nk #pragma data_seg()
FH3^@@Y% t GS>f>i 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。
p[LPi5 VZz>)Kz: 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:
@"h@4q/W !=)b2}e/> BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
[[XbKg`"? cKey,UCHAR cMask)
h/goV {
{)`tN&\ BOOL bAdded=FALSE;
XfZ^,'z for(int index=0;index<MAX_KEY;index++){
OUtXu7E$ if(hCallWnd[index]==0){
9B)<7JJX!J hCallWnd[index]=hWnd;
6lAHB*` HotKey[index]=cKey;
8el\M/u{ HotKeyMask[index]=cMask;
uD=FTx bAdded=TRUE;
*`]#ntz9 KeyCount++;
x*#9\*@EI break;
N\{{:<Cp\ }
<sncW>?!~ }
?y/LMja return bAdded;
L#|6Lnp^ }
^{}$o#iof //删除热键
XM#xxf* Y BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
fW3awR{ {
~bD'QMk BOOL bRemoved=FALSE;
?mi1PNps# for(int index=0;index<MAX_KEY;index++){
t,]E5,1 if(hCallWnd[index]==hWnd){
xg.o7-^M if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
.P:mYC hCallWnd[index]=NULL;
w<|Qezi3
w HotKey[index]=0;
Z1dLC'/b] HotKeyMask[index]=0;
VN/v] bRemoved=TRUE;
huat,zLS KeyCount--;
%G`GdG}T break;
^'G,sZ6'Nh }
Vi*HG &DD }
o4t6NDa }
UJ?qGOM3x> return bRemoved;
w,x'FZD }
P1_ZGeom* S x0QPX 8!XK[zL DLL中的钩子函数如下:
5jey%)= s(0"r. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Hx?OCGj=S* {
yx\I&\i BOOL bProcessed=FALSE;
^q}cy1"j" if(HC_ACTION==nCode)
zgn~UC6& {
oMeIXb)z if((lParam&0xc0000000)==0xc0000000){// 有键松开
Oz1S*<]=,~ switch(wParam)
b haYbiX? {
U6xs'0 case VK_MENU:
;&} rO.0 MaskBits&=~ALTBIT;
^Q9!DF m break;
Sg+0w7:2 case VK_CONTROL:
G~X93J MaskBits&=~CTRLBIT;
_I/uW|> break;
[XbNZ6 case VK_SHIFT:
%8c2d MaskBits&=~SHIFTBIT;
M"\j7( break;
f=--$o0U~ default: //judge the key and send message
lL;SP& break;
B,(zp#&yB }
3/s" ;Kg, for(int index=0;index<MAX_KEY;index++){
9g~"Y[ ] if(hCallWnd[index]==NULL)
0[In5I I continue;
61pJVOe if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_Squ%z:D {
b-OniMq~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
GX#SCZ&}C bProcessed=TRUE;
y!u=]BE
}
*LOUf7` }
1+ib(MJ<:# }
hM "6-60 else if((lParam&0xc000ffff)==1){ //有键按下
AI,Jy%62/ switch(wParam)
U-ADdOh"q {
8<:.DFq case VK_MENU:
J e"~/+ MaskBits|=ALTBIT;
4N[KmNi< break;
i(mQbWpN case VK_CONTROL:
4apaUP=Jp MaskBits|=CTRLBIT;
Ka/ *Z4" break;
d1BE;9*/7 case VK_SHIFT:
^_ST#fFS MaskBits|=SHIFTBIT;
FNR<=M break;
m&a 8/5 default: //judge the key and send message
Op5S' break;
?2nF1>1 }
x2h5,.K for(int index=0;index<MAX_KEY;index++){
}8eu 9~ if(hCallWnd[index]==NULL)
{?RVw`g&f continue;
R5& R~1N if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6DT^:LHS {
<5E: ,< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
z)F<{]% bProcessed=TRUE;
RAU" }
A+41JMH }
c-oIP~, }
py }`thx if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
>_|$7m.?n[ for(int index=0;index<MAX_KEY;index++){
4GqwY"ja if(hCallWnd[index]==NULL)
6%a:^f] continue;
GV0-"9uwX~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
8)bqN$*h SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
$2w][ d1 //lParam的意义可看MSDN中WM_KEYDOWN部分
d6f+[<< }
),(HCzK` }
m <'&`B; }
<`?V:};Q return CallNextHookEx( hHook, nCode, wParam, lParam );
qAW?\*n5N }
Pr'Ij EECuJ+T 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
2(i|n= ?k$'po*Eq BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Fk#$@^c@ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
4Kh0evZ bPA >xAH 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:
@0 #JY:" CmxQb,Ul s LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
ybU_x {
c^1tXu|& if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
$*+IsP! {
@hwe //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
sR;u#". SaveBmp();
Xv<K>i>k return FALSE;
({0:1*lF@ }
*CCh\+S7m …… //其它处理及默认处理
VT [TE }
-?p4"[ bbs'>D3 :Z&<5 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
^v5<* uf%m <Uc?#;%Y} 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
fM`.v+ P09f 二、编程步骤
2rxz<ck( &4{!5r 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
~@$RX:p K$KVm^` 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
lWakyCS {I8C&GS 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
W1_.wN$,5 /|m0)H.> 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]}:WGFM &embAqW: 5、 添加代码,编译运行程序。
k}]M`ad 9Cz|?71 三、程序代码
]$i@^3`[w ^Lv)){t ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
apgR[=Oy #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
2ElZ&(RZJF #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
5x"eM= #if _MSC_VER > 1000
\}71pzw( #pragma once
L;-V Yo# #endif // _MSC_VER > 1000
an2Yluc; #ifndef __AFXWIN_H__
<q&4Y+b #error include 'stdafx.h' before including this file for PCH
8d7 NESYl #endif
Y_<-.?jf #include "resource.h" // main symbols
G8&/Ic class CHookApp : public CWinApp
g'AxJ {
<Hr~|oG public:
G!+Mu2 CHookApp();
GfV#^qi // Overrides
&grqRt // ClassWizard generated virtual function overrides
a}Z+"D //{{AFX_VIRTUAL(CHookApp)
H128T8?r[ public:
b|-S;cw virtual BOOL InitInstance();
m*.+9 6 virtual int ExitInstance();
_:]g:F[
# //}}AFX_VIRTUAL
tb4^+&.GS //{{AFX_MSG(CHookApp)
:DrF)1C // NOTE - the ClassWizard will add and remove member functions here.
C55Av%-= // DO NOT EDIT what you see in these blocks of generated code !
tl;b~k //}}AFX_MSG
20# V?hX3 DECLARE_MESSAGE_MAP()
l5#SOo\ };
=!\Y;rk LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
p\R&vof* BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
!Df>Q5~g BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
.C` YO2, BOOL InitHotkey();
zpjE_| BOOL UnInit();
]$=#:uf #endif
x4K A8 V8Ri2&|3 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
c \;_jg #include "stdafx.h"
O-huC:zZh #include "hook.h"
m}7Nu #include <windowsx.h>
cn Ohj #ifdef _DEBUG
A*g-pJh #define new DEBUG_NEW
msY6zJc` #undef THIS_FILE
/;kSa}"Q static char THIS_FILE[] = __FILE__;
Y]tbwOle #endif
1|m%xX,[ #define MAX_KEY 100
pp{2[> #define CTRLBIT 0x04
m%=*3gH]& #define ALTBIT 0x02
y,/i3^y#_ #define SHIFTBIT 0x01
]GO=8$Z #pragma data_seg("shareddata")
l0U23i HHOOK hHook =NULL;
&$ud;r# UINT nHookCount =0;
.TCDv4? static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
VVDW=G static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
5M/~|"xk static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
dI|D c static int KeyCount =0;
jweX"G54R static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
rsq?4+\ #pragma data_seg()
ac\( [F- HINSTANCE hins;
Gt+rVJ=v void VerifyWindow();
53 -Owjpx BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
)KEW`BC5T //{{AFX_MSG_MAP(CHookApp)
H'JU5nE // NOTE - the ClassWizard will add and remove mapping macros here.
4,>9N9.?9 // DO NOT EDIT what you see in these blocks of generated code!
P)cEYk //}}AFX_MSG_MAP
!6x7^E;c END_MESSAGE_MAP()
CW2)1%1iz =t`cHs29 CHookApp::CHookApp()
}*C*!?pcd {
3I(;c ,S // TODO: add construction code here,
":f]egq
- // Place all significant initialization in InitInstance
S@g(kIo] }
tcO{CI xP,b/T#a CHookApp theApp;
X`1R&K;z^ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
uaz!ze+ {
3)OQgeKU BOOL bProcessed=FALSE;
',c~8U#q if(HC_ACTION==nCode)
gJCZ9{Nl {
}8POm# if((lParam&0xc0000000)==0xc0000000){// Key up
NJ]3qH switch(wParam)
a9UXg<4 {
kIX1u<M~ case VK_MENU:
s<rV1D MaskBits&=~ALTBIT;
Svb>s|D break;
SZEi+CRs0 case VK_CONTROL:
tJybR"NQ MaskBits&=~CTRLBIT;
h[&"KA break;
`<7!Rh,tS^ case VK_SHIFT:
Ij$C@hH MaskBits&=~SHIFTBIT;
EY:IwDA.} break;
*AYq:n6 default: //judge the key and send message
""Da2Md break;
;1s+1G}_z }
#n}~u@,o_ for(int index=0;index<MAX_KEY;index++){
6i2%EC9 if(hCallWnd[index]==NULL)
L7d1)mV continue;
0{g*\W*+~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
X6",Xr!{ {
1`YU9? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Z %Ozzp/ bProcessed=TRUE;
|q58XwU ` }
/isalOT }
JhfVm*, }
Fs].Fa else if((lParam&0xc000ffff)==1){ //Key down
vbVOWX6 switch(wParam)
xM(H4.< {
g;v;xlY`N case VK_MENU:
.] sJl MaskBits|=ALTBIT;
^lAM /
break;
8;V9%h`P> case VK_CONTROL:
tq}45{FH3 MaskBits|=CTRLBIT;
jn:_2g[ break;
I# &r5Q case VK_SHIFT:
ZZ7qSyBs? MaskBits|=SHIFTBIT;
M
`^[Y2 c break;
i'7+
?YL default: //judge the key and send message
u '7h(1@ break;
IHYLM;@L }
dH!z<~ for(int index=0;index<MAX_KEY;index++)
An$2='=/ {
xC,x_:R` if(hCallWnd[index]==NULL)
bh<;px- continue;
Vv45w#w; if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
+.Ij%S[Px5 {
e=WjFnK[x7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
FO5a<6 bProcessed=TRUE;
REU," }
3f] ;y<Km }
pK@=]K~l0 }
8.[F3Tk= if(!bProcessed){
?%h$deJ for(int index=0;index<MAX_KEY;index++){
w?8SQI,~X if(hCallWnd[index]==NULL)
pYx,*kG:HW continue;
NS~;{d\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
DK\XC%~m SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\xj;{xc }
+yp:douERi }
:-B+W9'5 }
d=PX}o^ return CallNextHookEx( hHook, nCode, wParam, lParam );
N+=|WeZ }
80Dn!9j* RqtBz3v BOOL InitHotkey()
eHy UY&N/ {
U}RBgPX! if(hHook!=NULL){
UowvkVa nHookCount++;
y
%Q. ( return TRUE;
#cu{AdK }
_cX}!d!j else
@"-\e|[N hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
\</!kY*3@t if(hHook!=NULL)
kFv*>>X` nHookCount++;
Zd6ik&S
return (hHook!=NULL);
P[2!D)A }
T&?g) BOOL UnInit()
NOo? {
(Jk&U8y if(nHookCount>1){
q(6.VU@ nHookCount--;
<w{?b'/q return TRUE;
/ce;-3+ }
c Mgd BOOL unhooked = UnhookWindowsHookEx(hHook);
#wI}93E if(unhooked==TRUE){
d+
jX49Vt nHookCount=0;
_x!idf hHook=NULL;
"XR=P>
xk }
u4C9ZYN return unhooked;
U!aM63F3 }
V4n~Z+k #i[:oC6m: BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
H#~gx_^U {
,~1'L6Ri? BOOL bAdded=FALSE;
L"qJZU for(int index=0;index<MAX_KEY;index++){
zuV%`n if(hCallWnd[index]==0){
"bm|p/A hCallWnd[index]=hWnd;
m2c'r3 UEu HotKey[index]=cKey;
@-
STo/ HotKeyMask[index]=cMask;
qq/>E*~ bAdded=TRUE;
d:@+dS KeyCount++;
<+_XGOt0< break;
>R+-mP!nj }
cb|+6m~ }
ABN4kM>% return bAdded;
tk&AZb,sP }
;xZ+1zmL0 _MBhwNBxZ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
eV[{c %wN: {
;6W ]f([ BOOL bRemoved=FALSE;
&h-_|N for(int index=0;index<MAX_KEY;index++){
gV2vwe if(hCallWnd[index]==hWnd){
2:*15RH3 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
m,k0 h% hCallWnd[index]=NULL;
r5}p . HotKey[index]=0;
um.ZAS_kmc HotKeyMask[index]=0;
D&G6^ME bRemoved=TRUE;
.a.HaBBV KeyCount--;
rH3U;K! break;
~"#0rPT }
?veeW6E( }
sbW+vc }
2d D"^z{ return bRemoved;
o,*m,Qc }
uUI#^ A Qr.{_M void VerifyWindow()
@dWA1tM {
DYf QlA for(int i=0;i<MAX_KEY;i++){
JQV%W+-@ if(hCallWnd
!=NULL){ \ 'm7un
if(!IsWindow(hCallWnd)){ iWs6 !s!
hCallWnd=NULL; ;6G]~}>o
HotKey=0; A{+/$7vek
HotKeyMask=0; UP-eKK'z
KeyCount--; 5 pCicwea#
} <=4$.2ym
} uY]';OtG
} 7=P)` @
} M| (VM=~
$*C
}iJsF
BOOL CHookApp::InitInstance() d@Z DIy
{ h4hAzFQ.s
AFX_MANAGE_STATE(AfxGetStaticModuleState()); T3wTMbZ!VK
hins=AfxGetInstanceHandle(); )Te\6qM
InitHotkey(); <Wn~s=
return CWinApp::InitInstance(); suN6(p(.
} 9xQ|Uad+%
/5,6{R9
int CHookApp::ExitInstance() S7+>Mk
{ y\FQt];z)
VerifyWindow(); :'[?/<iTg
UnInit(); ,U{dqw8E{
return CWinApp::ExitInstance(); +^AdD8U
} opfnIkCe
2*cNd}qr
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >ywl()4O
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8{>|%M
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ T9yI%;D
#if _MSC_VER > 1000 V%R]jbHZ#
#pragma once /@`"&@W'
#endif // _MSC_VER > 1000 G8repY
6s@!Yn|?
class CCaptureDlg : public CDialog v}DNeIh~
{ vPnS`&
// Construction F 'uqL+jVO
public: :` SIuu~@
BOOL bTray; RuHDAJ"&a
BOOL bRegistered; zA#pgX[#
BOOL RegisterHotkey(); b 8@}Jv
UCHAR cKey; i+`8$uz
UCHAR cMask; ,a5q62)q
void DeleteIcon(); Ftyxz&-4$p
void AddIcon(); zZ[kU1Fyv
UINT nCount; `{#""I^_
void SaveBmp(); AF:_&gF
CCaptureDlg(CWnd* pParent = NULL); // standard constructor L'wR$
// Dialog Data =c6d$
//{{AFX_DATA(CCaptureDlg)
^tTM
7
enum { IDD = IDD_CAPTURE_DIALOG }; [Q T ;~5
CComboBox m_Key; \n}%RD-Ce
BOOL m_bControl; ,LBj$U]e|E
BOOL m_bAlt; 9O- otAGM
BOOL m_bShift; 8$uq60JK
CString m_Path; qjRbsD>
CString m_Number; g0 Q,]\~
//}}AFX_DATA "-:H$
// ClassWizard generated virtual function overrides ,zjz "7'
//{{AFX_VIRTUAL(CCaptureDlg) Y~Uf2(7b5
public: /
B!j`UK
virtual BOOL PreTranslateMessage(MSG* pMsg); \4 b^*`d
protected: 9"[,9HN
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support PS~_a
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); YMo8C(
//}}AFX_VIRTUAL x1~AY/)v
// Implementation IR"C?
protected: 7^>~k}H
HICON m_hIcon; H ezbCwsx&
// Generated message map functions U%Fa.bL~
//{{AFX_MSG(CCaptureDlg) P,8TO-e7
virtual BOOL OnInitDialog(); &DW !$b
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); >_Tyzl>z
afx_msg void OnPaint(); OI Fjc0
afx_msg HCURSOR OnQueryDragIcon(); Csu9u'.V
virtual void OnCancel(); U/Cc!WXV]
afx_msg void OnAbout(); dsX"S;`v
afx_msg void OnBrowse(); Lum=5zDo
afx_msg void OnChange(); 5]G%MB/|$
//}}AFX_MSG U2`:'
DECLARE_MESSAGE_MAP() tO&n$$
}; "y8W5R5kL4
#endif TTO8tT3[6}
-[*y{K@dh
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 3_RdzW}f
#include "stdafx.h" !}}
)f/
#include "Capture.h" K7s[Fa6J
#include "CaptureDlg.h" C#[P<= v
#include <windowsx.h> vAP1PQX;
#pragma comment(lib,"hook.lib") b|V<Kp
#ifdef _DEBUG &am<_Tn*3
#define new DEBUG_NEW +/_XSo
#undef THIS_FILE iklZ[G%A0
static char THIS_FILE[] = __FILE__; l>|scs;TI
#endif ~;b}_?%o
#define IDM_SHELL WM_USER+1 9<&*iIrM
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~"*W;|)
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~APS_iG[
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ,OrrGwp&
class CAboutDlg : public CDialog TQ![
{ Lt~&K$t7~
public: |Fx *,91
CAboutDlg(); xm=Gt$>.o
// Dialog Data sw9ri}oc
//{{AFX_DATA(CAboutDlg) 44 8%yP
enum { IDD = IDD_ABOUTBOX }; md bi@ms@
//}}AFX_DATA BJ_"FG
// ClassWizard generated virtual function overrides jcC"vr'u|
//{{AFX_VIRTUAL(CAboutDlg) ) M8,Tv*~
protected: zv"NbN
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support aY4v'[
//}}AFX_VIRTUAL X#by Dg
// Implementation |"}7)[BW}
protected: 8@doKOA~T
//{{AFX_MSG(CAboutDlg) k v_t6 (qd
//}}AFX_MSG {^Q,G x(
DECLARE_MESSAGE_MAP() ;mI^J=V3
}; ,+d8
O,7S1
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) le_aIbB"P
{ bp" @p:
//{{AFX_DATA_INIT(CAboutDlg) 'PrBa[%
//}}AFX_DATA_INIT GfSD%"
} u-jV@Tz
-F(luRBS(W
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
K#6@sas
{ "([gN:
CDialog::DoDataExchange(pDX); "1\GU1x
//{{AFX_DATA_MAP(CAboutDlg) W9}
,f
//}}AFX_DATA_MAP r=37Q14v
} s-I M
7m%12=Im5
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) VL5VYv=:
//{{AFX_MSG_MAP(CAboutDlg) k&L/JzzI
// No message handlers -G7)Y:
//}}AFX_MSG_MAP KL!cPnAUu
END_MESSAGE_MAP() \HrtPm`e
cBbumf 9C
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) r#oJch=
: CDialog(CCaptureDlg::IDD, pParent) iDcYyNE
{ "J*>g(H53
//{{AFX_DATA_INIT(CCaptureDlg) Jza?DhSAZ
m_bControl = FALSE; p7{H
"AC
m_bAlt = FALSE; 0)zJG |
m_bShift = FALSE; <H#0pFB
m_Path = _T("c:\\"); uF[*@N
m_Number = _T("0 picture captured."); W!"QtEJ,
nCount=0; !5h8sD;
bRegistered=FALSE; d"E3ypPK
bTray=FALSE; _B^X3EOc
//}}AFX_DATA_INIT Xk'Pc0@a
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 '
-9=>
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); O> _ F
} 4o";p}[b
Cb|1Jtb
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2 ( I4h[
{ -da: j-_
CDialog::DoDataExchange(pDX); K}
T=j+
//{{AFX_DATA_MAP(CCaptureDlg) KSS]% 66Y
DDX_Control(pDX, IDC_KEY, m_Key); y$di_)&g
DDX_Check(pDX, IDC_CONTROL, m_bControl); eB_r.R{
DDX_Check(pDX, IDC_ALT, m_bAlt); +*`kJ)uP
DDX_Check(pDX, IDC_SHIFT, m_bShift); K;Hgq4
DDX_Text(pDX, IDC_PATH, m_Path); 1R yE8DdP
DDX_Text(pDX, IDC_NUMBER, m_Number); gH,Pz
//}}AFX_DATA_MAP h 2JmRO
} Gj%q:[r
f.%3G+
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +Q"~2_q5/;
//{{AFX_MSG_MAP(CCaptureDlg) $;$vcV9*
ON_WM_SYSCOMMAND() jAcKSx$}y"
ON_WM_PAINT() Q`.q,T8I
ON_WM_QUERYDRAGICON() r|]YS6
ON_BN_CLICKED(ID_ABOUT, OnAbout) av5a2r0W1
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >z/.8!#Q
ON_BN_CLICKED(ID_CHANGE, OnChange) !%t2ZQJq
//}}AFX_MSG_MAP EbX!;z
END_MESSAGE_MAP() qQ3pe:n?
WI*CuJU<zJ
BOOL CCaptureDlg::OnInitDialog() 8lDb<i
{ V?0IMc
CDialog::OnInitDialog(); bYpeI(zK
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ^~vM*.j~j
ASSERT(IDM_ABOUTBOX < 0xF000); 2 A";oE
CMenu* pSysMenu = GetSystemMenu(FALSE); n'q:L(`M
if (pSysMenu != NULL) 5`:d$rv
{ 0y/31hp
CString strAboutMenu; IC8%E3
strAboutMenu.LoadString(IDS_ABOUTBOX); ,~1sZ`C
if (!strAboutMenu.IsEmpty()) 01&E.A
{ Qm*ZOz'i
pSysMenu->AppendMenu(MF_SEPARATOR); ?*
,
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ux!YVvTPd
} NOkgG0Z
} XjP;O,x
SetIcon(m_hIcon, TRUE); // Set big icon f}*:wj
SetIcon(m_hIcon, FALSE); // Set small icon ]auqf
m_Key.SetCurSel(0); Ac*J;fI
RegisterHotkey(); .m\0<8C
CMenu* pMenu=GetSystemMenu(FALSE); .L;e:cvx
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); @OFxnF`
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); AOKC1iD%Y
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); FIVC~LDd
return TRUE; // return TRUE unless you set the focus to a control k.c.7%|~;
} RP+)sCh
Q (q&(/
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) cPAR.h,b?
{ #pK"
^O*!
if ((nID & 0xFFF0) == IDM_ABOUTBOX) S-Bx`e9 '
{ i'>5vU0?3
CAboutDlg dlgAbout; )cP)HbOd=
dlgAbout.DoModal(); v[8+fd)}S
} T2.[iD!A
else ITn PF{N
{ 3Z me?o*bY
CDialog::OnSysCommand(nID, lParam); f{[0;qDJ
} liLhvcd
} %m[ZU<v
FINHO058^Y
void CCaptureDlg::OnPaint() PXJ7Ek*/
{ WK7?~R%rq
if (IsIconic()) 7OG:G z+)x
{ gGM QRRq
CPaintDC dc(this); // device context for painting ;y1/b(t
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); yf8kBT:&S
// Center icon in client rectangle "8cI]~V
int cxIcon = GetSystemMetrics(SM_CXICON); &|RTLGwX
int cyIcon = GetSystemMetrics(SM_CYICON); rcMf1\
CRect rect; y@LiUe5
GetClientRect(&rect); es x/{j;<u
int x = (rect.Width() - cxIcon + 1) / 2; SZ$WC8AX
int y = (rect.Height() - cyIcon + 1) / 2; v3XM-+Z4
// Draw the icon z,^~H
dc.DrawIcon(x, y, m_hIcon); _!,
J iOI
} q-_!&kDK"
else ^->S7[N?
{ "&4r!2A
CDialog::OnPaint(); #)]t4wa_W
} NsM`kZM4H
} NIbK3`1
w7Y@wa!
HCURSOR CCaptureDlg::OnQueryDragIcon() 02*qf:kTnA
{ 8=joVbs
return (HCURSOR) m_hIcon; udLI AV*
} 6j6;lNUc
fxr#T'i
void CCaptureDlg::OnCancel() {N/%%O.b
{ sO6=w%l^
if(bTray) yrfV&C%=n
DeleteIcon(); r@Jy*2[-Jq
CDialog::OnCancel(); Yb/*2iWX
} 9`Fw}yAt
s<k2vbhI
void CCaptureDlg::OnAbout() ?7LvJ8
{ *x;4::'Jn
CAboutDlg dlg; PRTjXq6)5
dlg.DoModal(); ~eoM
2XlW
} 09G47YkSy1
kV5)3%?
void CCaptureDlg::OnBrowse() S5y.H
{ zhFm2
CString str; fbOqxF"?we
BROWSEINFO bi; )=29Hm"
char name[MAX_PATH]; rZaO^}u]
ZeroMemory(&bi,sizeof(BROWSEINFO)); Z
f\~Cl
bi.hwndOwner=GetSafeHwnd(); ,%l}TSs
bi.pszDisplayName=name; X~JP
1
bi.lpszTitle="Select folder"; foQo`}"5
bi.ulFlags=BIF_RETURNONLYFSDIRS; (uDd_@a9t
LPITEMIDLIST idl=SHBrowseForFolder(&bi); q^EY?;Y
if(idl==NULL) X|eZpIA45
return; )S2yU<6oOt
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); s:"Sbml
str.ReleaseBuffer(); V8TdtGB.|h
m_Path=str; Tsa]SN14
if(str.GetAt(str.GetLength()-1)!='\\') ]6)u$4X6$
m_Path+="\\"; x4H#8ZK!
UpdateData(FALSE); NzP71t+
} K SOD(
x6s|al
void CCaptureDlg::SaveBmp() <]LljTm`i
{ R( FQ+h
CDC dc; @y`xFPB
dc.CreateDC("DISPLAY",NULL,NULL,NULL); G`>]ng
CBitmap bm; ^9q#,6
int Width=GetSystemMetrics(SM_CXSCREEN); g;8 wP5i
int Height=GetSystemMetrics(SM_CYSCREEN); _J W|3q
bm.CreateCompatibleBitmap(&dc,Width,Height); er)I ".|
CDC tdc; Xzf,S;XV~
tdc.CreateCompatibleDC(&dc); 0x!&>
CBitmap*pOld=tdc.SelectObject(&bm); @&O4a2+
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); HRDpFMA/~
tdc.SelectObject(pOld); p.=9[`
BITMAP btm; wLXJ?iy3
bm.GetBitmap(&btm); o5F:U4sG
DWORD size=btm.bmWidthBytes*btm.bmHeight; `**{a/3
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <c pck
BITMAPINFOHEADER bih; #H>{>0q
bih.biBitCount=btm.bmBitsPixel; PKSfu++Z
bih.biClrImportant=0; c8JW]A`9b)
bih.biClrUsed=0; <dH@e
bih.biCompression=0; Q,xL8i
M,
bih.biHeight=btm.bmHeight; l_+@Xpl
bih.biPlanes=1; x2#JD|0
bih.biSize=sizeof(BITMAPINFOHEADER); !ou#g5Q@z
bih.biSizeImage=size; ~,HFd`
bih.biWidth=btm.bmWidth; qEST[S V
bih.biXPelsPerMeter=0; J}X{8Ds9
bih.biYPelsPerMeter=0; FHSoj=
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $?0ch15/
static int filecount=0; gtA34iw
CString name; UDg's
name.Format("pict%04d.bmp",filecount++); UlE%\L0GD&
name=m_Path+name; EaO@I.[
BITMAPFILEHEADER bfh; DdgiY9a.
bfh.bfReserved1=bfh.bfReserved2=0; =L" 0]4K
bfh.bfType=((WORD)('M'<< 8)|'B'); PFh ^Z L
bfh.bfSize=54+size; GYaP"3Lu
bfh.bfOffBits=54; V;XKvH
CFile bf; nG!<wlY14P
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ fq6%@M~
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ==5F[UX
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }bjZeh.
bf.WriteHuge(lpData,size); FoyYWj?,R
bf.Close(); !=,4tg`
nCount++; "S%t\
} EX`P(=zD
GlobalFreePtr(lpData); EbQLMLD%
if(nCount==1) `S@TiD*
m_Number.Format("%d picture captured.",nCount); G-Tmk7m
else |HAJDhM,l
m_Number.Format("%d pictures captured.",nCount); G:1'}RC :
UpdateData(FALSE); mUh]`/MK$
} Mn.,?IF`K
(hzN(Dh
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ssi7)0
{ MePD:;mm^
if(pMsg -> message == WM_KEYDOWN) $>XeC}"x68
{ ~t`s&t'c|
if(pMsg -> wParam == VK_ESCAPE) ?0VR2Yb${b
return TRUE; +tqErh?Al
if(pMsg -> wParam == VK_RETURN) 85GIEUvH/
return TRUE; &[.`xZ(|
} H,!xTy"Wh
return CDialog::PreTranslateMessage(pMsg); )#}>,,S
} L8QWEFB|
.gRj^pu
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _8VP'S=
{ senK(kbc
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @LKQ-<dZG
SaveBmp(); HgF;[rq3Q
return FALSE; )\fY1WD
} f&^(f1WO
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ pIJXP$v3
CMenu pop; bV_nYpo
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |@Tga_0p
CMenu*pMenu=pop.GetSubMenu(0); #@S%?`4,
pMenu->SetDefaultItem(ID_EXITICON); N6Ud(8*
CPoint pt; W_\zx<m
GetCursorPos(&pt); p~qe/
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Z'JS@dV
if(id==ID_EXITICON) B[t^u\Fk
DeleteIcon(); S\e&xUA;|
else if(id==ID_EXIT) xAQtX=FoX+
OnCancel(); 5</$dcG
return FALSE; RdTM5ANT
} 9 E!le=>
LRESULT res= CDialog::WindowProc(message, wParam, lParam); |"3<\$[
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 7;"0:eX
AddIcon(); 11[lc2
return res; }{o!
} gb ga"WO
(jgk !
6
void CCaptureDlg::AddIcon() Ej(Jj\
{ :HkBP90o
NOTIFYICONDATA data; +&Ld`d!n
data.cbSize=sizeof(NOTIFYICONDATA); tgK
I
CString tip; '$K E=Jy
tip.LoadString(IDS_ICONTIP); G 6sK3K
data.hIcon=GetIcon(0); f!Q\M1t)
data.hWnd=GetSafeHwnd(); T~TP
strcpy(data.szTip,tip); yB*,)x0
@
data.uCallbackMessage=IDM_SHELL; FK|O^->B
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; {4 Of.
data.uID=98; Hcq.Lq;2:
Shell_NotifyIcon(NIM_ADD,&data); 'rD6MY
ShowWindow(SW_HIDE); La26"C"X
bTray=TRUE; P3$eomX'
} <B"sp r&1
tli.g
void CCaptureDlg::DeleteIcon() )ZJvx%@i
{ &SY!qTxF
NOTIFYICONDATA data;
l] nt@0+
data.cbSize=sizeof(NOTIFYICONDATA); _FLEz|%~
data.hWnd=GetSafeHwnd(); nV;'UpQw
data.uID=98; RgE`H r
Shell_NotifyIcon(NIM_DELETE,&data); "/#JC}]
ShowWindow(SW_SHOW); tT$OnZu&
SetForegroundWindow(); l\HdB"nT
ShowWindow(SW_SHOWNORMAL); aER|5!7(2\
bTray=FALSE; 2ej7Ql_@c
} <qCa9@Ea
<AHpk5Sn{
void CCaptureDlg::OnChange() uy'ghF
{ L[` l80
RegisterHotkey(); s[1ao"sZ^
} lo1Ui`V
]rmBM
BOOL CCaptureDlg::RegisterHotkey()
5\- uo
{ 5jdZC(q5a
UpdateData(); qtGJJ#^,
UCHAR mask=0; .1x04Np!
UCHAR key=0; ^rkKE
dd
if(m_bControl) PxHFH pL
mask|=4; !Brtao"m
if(m_bAlt) yC,/R371k
mask|=2; !QUY (
if(m_bShift) j=_rUc'Me
mask|=1; K~x,so
key=Key_Table[m_Key.GetCurSel()]; 8!g
`bC#%
if(bRegistered){ S)rZE*~2
DeleteHotkey(GetSafeHwnd(),cKey,cMask); z`y9<+
bRegistered=FALSE; YeX*IZX8
} ));#oQol9
cMask=mask; 5sD,gZ7
cKey=key; g;IlS*Ld
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); T)C@6/
return bRegistered; BxY t*b%
} [\uR3$j#
g|=_@
pL
四、小结 WA{igj@\
B*7kX&Uq
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。