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:
ggXg4~WL
rp{q.fy'U 一、实现方法
MCjf$pZN] C`%cPl 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
~\6Kq`Y R>BnUIu #pragma data_seg("shareddata")
hL+)XJu^J HHOOK hHook =NULL; //钩子句柄
oZQ%P UINT nHookCount =0; //挂接的程序数目
71Q-_Hi static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
48Vmz static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
H?m9HBDpn static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
GNgPf"}K static int KeyCount =0;
)!s f@F? static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
,Hlbl}.ls #pragma data_seg()
U\*}} [z5pqd- 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
[z'PdYQR/{ 5RrzRAxq DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
G0Eqo$W)S }4Ef31X8q BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
2"cUBFc1I cKey,UCHAR cMask)
f!|7j}3 {
vR[XbsNM BOOL bAdded=FALSE;
g\[?U9qN for(int index=0;index<MAX_KEY;index++){
x\z*iv if(hCallWnd[index]==0){
p2cwW/^V hCallWnd[index]=hWnd;
|08b=aR6ro HotKey[index]=cKey;
8eCC
=Az: HotKeyMask[index]=cMask;
$ @QF<?i~ bAdded=TRUE;
Ka%u#}; KeyCount++;
(S3\O `5 break;
"#Qqwsw7 }
#&u9z5ywM }
$Y&
8@/L return bAdded;
Q"itV&d, }
(v+nn1, //删除热键
U.g7' `Z< BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
%Bn"/0, {
v50w}w' BOOL bRemoved=FALSE;
YflM*F` for(int index=0;index<MAX_KEY;index++){
n] {sBI3 if(hCallWnd[index]==hWnd){
.K%1{`.| if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Y_'3pX, hCallWnd[index]=NULL;
y:,Ro@H% HotKey[index]=0;
!:"$1kh1(" HotKeyMask[index]=0;
h\dq]yOl bRemoved=TRUE;
c~ x KeyCount--;
hq+j8w}<- break;
!(2rU @. }
r Z)?uqa }
TC[(mf:8 }
($s%5| return bRemoved;
mcO/V-\5' }
>(T)9fKF "]H_;:{f +h*-9 DLL中的钩子函数如下:
"L ,)4v/J my|]:(_0d LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
!C]2:+z-MF {
)w/ #T BOOL bProcessed=FALSE;
P qUjBP\ if(HC_ACTION==nCode)
_TLB1T^/4 {
X"hdCY% if((lParam&0xc0000000)==0xc0000000){// 有键松开
f%ThS42 switch(wParam)
q)N]*~ {
MuI>ZoNF case VK_MENU:
*m$lAWB5D MaskBits&=~ALTBIT;
{"e)Jj_= break;
ut/3?E1 Z case VK_CONTROL:
E]@$,)nC MaskBits&=~CTRLBIT;
d-%bRGo/ break;
1 >}x9D case VK_SHIFT:
cJ^{iOQ+ MaskBits&=~SHIFTBIT;
k4i*80 break;
[T}Lq~ default: //judge the key and send message
~(v7:? break;
`PoFKtVXM }
9I1D'7wI^^ for(int index=0;index<MAX_KEY;index++){
h;C/} s if(hCallWnd[index]==NULL)
3:]c> GPQ continue;
Sj(5xa[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
sd
m4zV]& {
_ZMAlC*$G SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
WWBm*?U bProcessed=TRUE;
=%=lq0GF0 }
/8Wfs5N }
-|.Izgc }
y]U]b G{ else if((lParam&0xc000ffff)==1){ //有键按下
MrU0Jrk4+ switch(wParam)
a]S0|\BkN {
|$:y8H'J case VK_MENU:
-ZVCb@% MaskBits|=ALTBIT;
'73g~T%$^* break;
KHO@"+ case VK_CONTROL:
y3+iADo.p MaskBits|=CTRLBIT;
y&&%%3 break;
cfZ$V^xM case VK_SHIFT:
x$L(!ZDh MaskBits|=SHIFTBIT;
-s6k't break;
>.=v*\P default: //judge the key and send message
3QF/{$65! break;
1OI/,y8} }
h<0&|s*a) for(int index=0;index<MAX_KEY;index++){
oE.59dx if(hCallWnd[index]==NULL)
b0|;v-v continue;
?h|&kRq if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
b/soU2?^ {
Rt+ak} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
- _?U/k(Hi bProcessed=TRUE;
cF V[k'F }
~W..P:wG5 }
UTS.o#d }
Z<IN>:l if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
k}&7!G@T for(int index=0;index<MAX_KEY;index++){
EA``G8Vn> if(hCallWnd[index]==NULL)
J`[v u4 continue;
{9Ug9e{
~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
mDdL7I SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
:9~LYJ
? //lParam的意义可看MSDN中WM_KEYDOWN部分
+ktubJ@Qgj }
j;yKL-ycB }
E (.~[-K4 }
:B7dxE9[r return CallNextHookEx( hHook, nCode, wParam, lParam );
5<$8.a# }
aN?^vW< zI.%b7wq 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:
,CxIA^ f`K[oCfu BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
5q,ZH6\
{ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
?#~km0~F) &WKAg:^k) 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:
Dq[Z0"8 *!r"+?0gN LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
rbl7-xhC7 {
-{z<+(K!$ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
=&t]R?
F {
6PyW(i(bs //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Am@:<J SaveBmp();
N`J]k
B7 return FALSE;
g#%Egb1 }
('z:XW96 …… //其它处理及默认处理
VOSq%hB }
0dW*].Gi: F*-+5nJ&@ u?rs6A[h# 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。
eb>jT: Oy_%U* 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。
s4`,Z*H *cP(3n3]R 二、编程步骤
43,baeG %v4*$E!f 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";
|OiM(E( WBWIHv{j 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
&3$FkU^F6 d7G
DIYH< 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;
N4l}5(e 4I8QM&7 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;
*?pnTQs^ FQ>y2n=<d 5、 添加代码,编译运行程序。
n0QHrIf{ zF@[S 三、程序代码
SUDvKP lhX4MB" ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Qp9QSyMs} #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
LP'~7FG #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
eD|"?@cE #if _MSC_VER > 1000
O%f{\Fr #pragma once
TVF:z_M9 #endif // _MSC_VER > 1000
!l5@L\ #ifndef __AFXWIN_H__
n_(f"Uv #error include 'stdafx.h' before including this file for PCH
lnGg1/ #endif
cB)tfS4) #include "resource.h" // main symbols
E/<n"'0ek class CHookApp : public CWinApp
Y;"jsK{$ {
67Ev$a_d" public:
Bbtc[@"X CHookApp();
7 lSR // Overrides
{:#c1d2@8 // ClassWizard generated virtual function overrides
vdh[%T,& //{{AFX_VIRTUAL(CHookApp)
Lvrflx*Q public:
6rM{r> virtual BOOL InitInstance();
L}7 TM:% virtual int ExitInstance();
ZH<qidpR //}}AFX_VIRTUAL
g'td(i[ //{{AFX_MSG(CHookApp)
A2!pbeG // NOTE - the ClassWizard will add and remove member functions here.
G8WPXj( // DO NOT EDIT what you see in these blocks of generated code !
#qARcxbK| //}}AFX_MSG
N2 t` DECLARE_MESSAGE_MAP()
7m %[$X` };
.Fx3WryF LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
N85ZbmU~
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
\Xe{vlo>h BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
.7M.bpmqE BOOL InitHotkey();
yg4#,4---b BOOL UnInit();
Z_a@,k:+[ #endif
Tz~a. h@ 7uf5w0] //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
T
oT(' #include "stdafx.h"
1p$ *N #include "hook.h"
s@E)=;! #include <windowsx.h>
1,7
}ah_ #ifdef _DEBUG
E:-~SH} #define new DEBUG_NEW
OdOn wY #undef THIS_FILE
x |gYxZ static char THIS_FILE[] = __FILE__;
Dk&(QajL #endif
qDqy9u:g #define MAX_KEY 100
BSy{"K*M #define CTRLBIT 0x04
Uw| -d[! #define ALTBIT 0x02
3dJiu #define SHIFTBIT 0x01
/ U!xh3 #pragma data_seg("shareddata")
z "z HHOOK hHook =NULL;
J*_^~t UINT nHookCount =0;
v2a(yH static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
'blMwD{0&\ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
138v{Z static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
.V\~#Ro$G static int KeyCount =0;
n]7rHV}G static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
[mj=m?j #pragma data_seg()
|
O 9 b HINSTANCE hins;
A'Z!l20_ void VerifyWindow();
WYP\J1sy BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
S(^YTb7 //{{AFX_MSG_MAP(CHookApp)
HH0ck(u_A* // NOTE - the ClassWizard will add and remove mapping macros here.
6pt|Crvu // DO NOT EDIT what you see in these blocks of generated code!
).0p\.W~ //}}AFX_MSG_MAP
Udf\;G@ END_MESSAGE_MAP()
LK!sk5/ .wUnN8crQ CHookApp::CHookApp()
_
nz^+ {
\t`Vq JLyu // TODO: add construction code here,
6,|>;,U7 // Place all significant initialization in InitInstance
rCsC}2O }
HR?bnkv|id Qmb+%z CHookApp theApp;
y~Yv^'Epf LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
xFJT&=Af W {
-SLk8x BOOL bProcessed=FALSE;
>rSCf= if(HC_ACTION==nCode)
LpI4R {
j}K3YfH if((lParam&0xc0000000)==0xc0000000){// Key up
`Y+R9bd switch(wParam)
t=My=pG {
y+= s/c case VK_MENU:
Pa#Jwo MaskBits&=~ALTBIT;
/|#2ehE break;
XH0o8\. case VK_CONTROL:
_|4QrZ$n( MaskBits&=~CTRLBIT;
P.g./8N`z break;
IwS<p- case VK_SHIFT:
,Z
:2ba MaskBits&=~SHIFTBIT;
!)CY\c4}d> break;
YMy** default: //judge the key and send message
O_GHvLO= break;
Z0O0Q =e\Y }
MRZN4<}9 for(int index=0;index<MAX_KEY;index++){
8kr$w$=q if(hCallWnd[index]==NULL)
7xY&7 x(v continue;
VKw.g@BY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
N})vrB;1 {
2^75|Q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
[Jjo H1E@ bProcessed=TRUE;
Yt{Z+.;9OI }
A>315!d" }
g;OR{ }
/J Y6S else if((lParam&0xc000ffff)==1){ //Key down
6
{F#_. switch(wParam)
7q 5 \]J[ {
%KN2iNq case VK_MENU:
W5()A,R MaskBits|=ALTBIT;
;PqC*iz break;
d_f*'M2Gv case VK_CONTROL:
8Fbt >-N<\ MaskBits|=CTRLBIT;
,`'A"]" break;
oK<H/76x case VK_SHIFT:
DY/%|w*L MaskBits|=SHIFTBIT;
l}T@Cgt break;
%F$]v default: //judge the key and send message
m(1ot M9 break;
7|bBC+;( }
33a}M;vx for(int index=0;index<MAX_KEY;index++)
@at*E%T[ {
gx eu2HG if(hCallWnd[index]==NULL)
iAPGP-<6 continue;
%U.x9UL if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
;*U&lT {
$]W*;MTI} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
7TU77 bProcessed=TRUE;
cg_tJ^vrY }
bP|-GCKM8 }
jaVx9FR+ }
Nr"GxezU+A if(!bProcessed){
T
:^OW5 d for(int index=0;index<MAX_KEY;index++){
. S;o#Zw*R if(hCallWnd[index]==NULL)
&N3a`Ua continue;
*+2BZZwT if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Gg:W% SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-- IewW }
?VTP|Z }
bGwj` lue }
j xq89x return CallNextHookEx( hHook, nCode, wParam, lParam );
;2MdvHhz1 }
8u"C7} N_ %+#l{\z BOOL InitHotkey()
]C|xo.=?] {
%RzkP}1>E if(hHook!=NULL){
;qUd]c9oi nHookCount++;
qjf4G[]! return TRUE;
X*bOE} }
WS1Y maV else
DIhV;[\ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
`Cy;/95m if(hHook!=NULL)
gy#G; 9p nHookCount++;
1p SEr6 return (hHook!=NULL);
KEq48+j }
r-[YJzf@P BOOL UnInit()
SpEu>9g& {
[Z1,~(3 if(nHookCount>1){
h<WTN_i} nHookCount--;
)o&}i3~Q
return TRUE;
+ eZn }
/de~+I5AB~ BOOL unhooked = UnhookWindowsHookEx(hHook);
jT-tsQ ., if(unhooked==TRUE){
[LbCG nHookCount=0;
<#T#+uO hHook=NULL;
7Fb!;W#X }
xP'"!d4^i return unhooked;
K2tOt7M! }
)S@TYzdAN 'm/`= QX BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
G49`a*Jn {
C3K")BO! BOOL bAdded=FALSE;
}\W^$e- for(int index=0;index<MAX_KEY;index++){
i[vOpg]J if(hCallWnd[index]==0){
<*ME&cgh4 hCallWnd[index]=hWnd;
>kDkv g1" HotKey[index]=cKey;
0!1cHB/c HotKeyMask[index]=cMask;
N'%l/ bAdded=TRUE;
SMA' VU KeyCount++;
zogl2e+ break;
i| *r/ }
`EVy }
8Tp!b
%2. return bAdded;
A_5M\iN\ }
V24FzQ?z:. !XF:.| BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:8lqo%5 {
h$ $i@IO0 BOOL bRemoved=FALSE;
MQo/R,F } for(int index=0;index<MAX_KEY;index++){
1?".R]<{2T if(hCallWnd[index]==hWnd){
4ZT0~37( if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
NHaqT@: hCallWnd[index]=NULL;
U%tpNWB HotKey[index]=0;
Ve[&_(fP HotKeyMask[index]=0;
IvB)d}p bRemoved=TRUE;
mGc i>)2
KeyCount--;
Twk,R. O break;
[nB4s+NX }
OH` |aqN }
IoHYY:[- }
U#(#U0s*- return bRemoved;
VCvFCyAz }
qW9~S0sl EN@<z; void VerifyWindow()
OZ Hfd7K4A {
=XZd_v for(int i=0;i<MAX_KEY;i++){
E~c>LF_]Q if(hCallWnd
!=NULL){ PO]c&}/
if(!IsWindow(hCallWnd)){ &MP +
hCallWnd=NULL; w(!COu
HotKey=0; MtBoX*"
HotKeyMask=0; _4X3g%nXl
KeyCount--; 3TNj*jo
} OF 1Qr bj
} Hni?r!8r
} @-aMj
} ::p(ViYG
)'axJ
BOOL CHookApp::InitInstance() L9,O,f
{ <PpW.1w
AFX_MANAGE_STATE(AfxGetStaticModuleState()); :<R"Kk@
hins=AfxGetInstanceHandle(); A=\:b^\
InitHotkey(); &u9@FFBT8
return CWinApp::InitInstance(); DM3 %+ xY
} ]Jx_bs~g
IF<<6.tz
int CHookApp::ExitInstance() \@GKVssw
{ V})b.\"F
VerifyWindow(); u=PYm+q{
UnInit(); Ag0)> PD^
return CWinApp::ExitInstance(); e c4vX
} DY8w\1g"
j@Y'>3
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file P] qL&_
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) L31#v$;4
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 'qiDh[ATa
#if _MSC_VER > 1000 Tu_4kUCR!f
#pragma once )LjW=;(b
#endif // _MSC_VER > 1000 TX$4x~:
N:&EFfg3
class CCaptureDlg : public CDialog cxn*!TwDs
{ \jHIjFwQ
// Construction W&;,7T8@
public: {6gY6X-R
BOOL bTray; 9]PMti
BOOL bRegistered; Hm
17El68
BOOL RegisterHotkey(); whh#J
(
UCHAR cKey; L_Lhmtm}m
UCHAR cMask; @$!rgLyL[
void DeleteIcon(); Q;y)6+VU4
void AddIcon(); ,HtXD~N
UINT nCount; LV`tnt's
void SaveBmp(); W?R@ eq.9
CCaptureDlg(CWnd* pParent = NULL); // standard constructor &^(4yw(~
// Dialog Data 6QG"~>v7'(
//{{AFX_DATA(CCaptureDlg) ?[c{pb,|
enum { IDD = IDD_CAPTURE_DIALOG }; !]t5(g_
CComboBox m_Key; 7 L$\S[E
BOOL m_bControl; f7oJ6'K
BOOL m_bAlt; #(G"ya
BOOL m_bShift; a?8boN(
CString m_Path; U~q2j#pJ
CString m_Number; H_d^Xk QZ
//}}AFX_DATA <7Ry"z6g;
// ClassWizard generated virtual function overrides :fA|J!^b[
//{{AFX_VIRTUAL(CCaptureDlg)
o3(:R0
public: [SU;U['7
virtual BOOL PreTranslateMessage(MSG* pMsg); {YF(6wVl
protected: {B7${AE
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support s%i
\z }/
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ,j e
//}}AFX_VIRTUAL *IWWD\U
// Implementation )8*}-z
protected: yz^4TqJ
HICON m_hIcon; \/F*JPhy
// Generated message map functions KuZZKh
//{{AFX_MSG(CCaptureDlg) sMgRpem;
virtual BOOL OnInitDialog(); 3#N`n |UgC
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); N<^)tR8+
afx_msg void OnPaint(); P`AW8Y6o
afx_msg HCURSOR OnQueryDragIcon(); 2U@:.S'K
virtual void OnCancel(); AwWo,Y399h
afx_msg void OnAbout(); !24PJ\~I
afx_msg void OnBrowse(); iCtS<"@Yx
afx_msg void OnChange(); @K1'Q!S*
//}}AFX_MSG RwUosh\W
DECLARE_MESSAGE_MAP() ]\ t20R{z
}; G>,43S!<
#endif @ |D#lBm
TGHyBPJb
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "P
yG;N!W
#include "stdafx.h" -8:/My
#include "Capture.h" ]DjnzClx
#include "CaptureDlg.h" G124!^
#include <windowsx.h> E?S
#pragma comment(lib,"hook.lib") OM?FpRVU8
#ifdef _DEBUG `Gh J)WA<
#define new DEBUG_NEW =HjC.h
#undef THIS_FILE ca<OG;R^
static char THIS_FILE[] = __FILE__; T'!p{Fbg;
#endif Jk;dtLL}4
#define IDM_SHELL WM_USER+1 sGG
q~7
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c!N#nt_<
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =
OzpI
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; r-o+NV
class CAboutDlg : public CDialog IO7cRg'-F
{ ai"N;1/1O|
public: x27$h)R0v
CAboutDlg(); ]z8Th5a?o
// Dialog Data y+h/jEbM</
//{{AFX_DATA(CAboutDlg) %LBf'iA
enum { IDD = IDD_ABOUTBOX }; )M*Sg?L
//}}AFX_DATA b8**M'k
// ClassWizard generated virtual function overrides $}B&u )
//{{AFX_VIRTUAL(CAboutDlg) |?
rO
protected: #j'7\SV
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mFt\xGa
//}}AFX_VIRTUAL Cz6bD$5
// Implementation e!vWGnY
protected: baGV]=j
//{{AFX_MSG(CAboutDlg) oiOu169]
//}}AFX_MSG rJ(A O'=
DECLARE_MESSAGE_MAP() 5Gm8U"UR
}; 6Ev+!!znu
+mN8uU~(kx
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) a:KL{e[
{ |XmzqX%
//{{AFX_DATA_INIT(CAboutDlg) SgkW-#
//}}AFX_DATA_INIT LI>Bl
} -$I$z o
%4})_h?j
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 5%+epzy
{ pm2]
CDialog::DoDataExchange(pDX); yji>vJHu
//{{AFX_DATA_MAP(CAboutDlg) Fb ~h{
//}}AFX_DATA_MAP 5a4i)I63o
} P!gY&>EU
!Wj`U$];
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) "n{JH9sA:
//{{AFX_MSG_MAP(CAboutDlg) %Vfr#j$=
// No message handlers &~'i,v|E
//}}AFX_MSG_MAP Pm QeO*f+
END_MESSAGE_MAP() ^4xl4nbx
^!$=(jh.
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %vbov}R
: CDialog(CCaptureDlg::IDD, pParent) *+(eH#_2/
{ NTSIClm}U
//{{AFX_DATA_INIT(CCaptureDlg) op3a*KG
m_bControl = FALSE; N*\ri0
m_bAlt = FALSE; 9*XT|B
m_bShift = FALSE; n4.\}%=z
m_Path = _T("c:\\"); PKd'lo
m_Number = _T("0 picture captured."); 2b Fr8FUt-
nCount=0; Hs6Kki1
bRegistered=FALSE; k1SD{BL
bTray=FALSE; Yp\Y]pym
//}}AFX_DATA_INIT .3#Xjhebvu
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 M"-.D;sa1
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); >_$_fB
} TaF;PGjVw
:ciD!Ly
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2*]
[M,L0c
{ yCkX+{ki
CDialog::DoDataExchange(pDX); Tl#2w=
//{{AFX_DATA_MAP(CCaptureDlg) xrI9t?QaCb
DDX_Control(pDX, IDC_KEY, m_Key); F+L%Ho;@P
DDX_Check(pDX, IDC_CONTROL, m_bControl); `i+2YCk
DDX_Check(pDX, IDC_ALT, m_bAlt); '&$zgK9T?
DDX_Check(pDX, IDC_SHIFT, m_bShift); dp4vybJ
DDX_Text(pDX, IDC_PATH, m_Path); wFjQ1<s=
DDX_Text(pDX, IDC_NUMBER, m_Number); / %iS\R%ca
//}}AFX_DATA_MAP 1 |/ |Lq%w
} TX7dwmt)N
HVzkS|^F
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [+="I
&
//{{AFX_MSG_MAP(CCaptureDlg) C0/G1\
ON_WM_SYSCOMMAND() ux,eY
ON_WM_PAINT() oFT1d
ON_WM_QUERYDRAGICON() F`,Hf Cb\
ON_BN_CLICKED(ID_ABOUT, OnAbout) \tY7Ga%c
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) D *IeG>%
ON_BN_CLICKED(ID_CHANGE, OnChange) nB]mj_)R^
//}}AFX_MSG_MAP Hs{x Z:
END_MESSAGE_MAP() Ocn@JOg
QL2 `X2
BOOL CCaptureDlg::OnInitDialog() Z v*uUe
{ B\qy:nr j
CDialog::OnInitDialog(); =W>a ~e]/
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); NG23
ASSERT(IDM_ABOUTBOX < 0xF000); y=jZ8+M
CMenu* pSysMenu = GetSystemMenu(FALSE); P*OT&q
if (pSysMenu != NULL) Ndyo)11z
{ u9u'5xAO
CString strAboutMenu; s6#e?5J
strAboutMenu.LoadString(IDS_ABOUTBOX); hZ.](rD
if (!strAboutMenu.IsEmpty()) _H-Fm$Q
{ k~F,n
pSysMenu->AppendMenu(MF_SEPARATOR);
Qstd;qE~
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); hlz/TIP^N3
} ;e9&WEG_\
} s
OLjT34
SetIcon(m_hIcon, TRUE); // Set big icon )@!T_#
SetIcon(m_hIcon, FALSE); // Set small icon \< a^5'
m_Key.SetCurSel(0); }mI0D>n
RegisterHotkey(); 9xE_Awlc85
CMenu* pMenu=GetSystemMenu(FALSE); G>jC+0nkry
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =
C/F26=|
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "
RIt
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Og?GYe^_
return TRUE; // return TRUE unless you set the focus to a control B]mMwqM#
} @gmo;8?k
(]10Z8"fJ
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Q]/{6:C
{ |`fuu2W!
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 5KIhk`S
{ n36iY'<) G
CAboutDlg dlgAbout; h##U=`x3
dlgAbout.DoModal(); V
'fri/Z
} D 5:'2i
else bfpoX,:
{ qv|}>wU
CDialog::OnSysCommand(nID, lParam); 9E4^hkD&
} '+'h^
} fKtlfQG
OKk"S_`
void CCaptureDlg::OnPaint() W1ndb:
{ .'h^
if (IsIconic()) BWB}bq
{ G|||.B8
CPaintDC dc(this); // device context for painting s?4nR:ZC}
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); SwaPRAF
// Center icon in client rectangle 'q RQO(9&m
int cxIcon = GetSystemMetrics(SM_CXICON); `tXd?E/e
int cyIcon = GetSystemMetrics(SM_CYICON);
.C5JQO
CRect rect; 6#\:J0
GetClientRect(&rect); 4]-7S l,
int x = (rect.Width() - cxIcon + 1) / 2; 2!9Zw$
int y = (rect.Height() - cyIcon + 1) / 2; SMfa(+V I
// Draw the icon 1TF S2R n
dc.DrawIcon(x, y, m_hIcon); Z`zLrXPD)
} *O\lR-z!k
else 7#7|+%W0
{ <P@O{Xi+K
CDialog::OnPaint(); FJxb!-0&
} .[3C
} 9`? M-U
4gUx#_AaG
HCURSOR CCaptureDlg::OnQueryDragIcon() F" 4;nU
{ kg,\l9AM
return (HCURSOR) m_hIcon; _+~&t9A!
} A..`?oGj
b):aqRwP
void CCaptureDlg::OnCancel() :2')`xT
{ (v?
rZv
if(bTray) Z)@[N
6\?
DeleteIcon(); SZ7; }
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CDialog::OnCancel(); fL]jk1.Xv-
} iun_z$I<+Z
!$!%era`
void CCaptureDlg::OnAbout() KGI<G
{ '#.D`9YI<
CAboutDlg dlg; ~`B]G
dlg.DoModal(); acQHqR
} T7O)
A4b+:MQ*OX
void CCaptureDlg::OnBrowse() w*o2lg9
{ `>)pqI%L[g
CString str; BglbQ'6p
BROWSEINFO bi; f|)~_JH
char name[MAX_PATH]; "}H2dn2n
ZeroMemory(&bi,sizeof(BROWSEINFO)); )@y7 qb
bi.hwndOwner=GetSafeHwnd(); 2$A "{2G
bi.pszDisplayName=name; 9>`dB
bi.lpszTitle="Select folder"; }m7$,'C%P
bi.ulFlags=BIF_RETURNONLYFSDIRS; #CB Kt,
LPITEMIDLIST idl=SHBrowseForFolder(&bi); &F Yv4J
if(idl==NULL) t)~$p#NS
return; Rtl1eJ-
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); NmF8BmIj
str.ReleaseBuffer(); bqx2lQf,_
m_Path=str; lQm7`+
if(str.GetAt(str.GetLength()-1)!='\\') S;%k?O7v
m_Path+="\\"; ?U1Nm~'UZ
UpdateData(FALSE); }qZ^S9
} {G<1.
;W FiMM\
void CCaptureDlg::SaveBmp() =wD&hDn4
{ /V#?d
CDC dc; WORRF
dc.CreateDC("DISPLAY",NULL,NULL,NULL); W`TSR?4~t?
CBitmap bm; I
}8b]
int Width=GetSystemMetrics(SM_CXSCREEN); e#F3KLSL`
int Height=GetSystemMetrics(SM_CYSCREEN); _g,_G
bm.CreateCompatibleBitmap(&dc,Width,Height); >xsY"N&1i'
CDC tdc; sr(nd35
tdc.CreateCompatibleDC(&dc); %,aSD#l`f
CBitmap*pOld=tdc.SelectObject(&bm); [8oX[oP
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Re'3 bs:+
tdc.SelectObject(pOld); , E$f"
BITMAP btm; ^<
bm.GetBitmap(&btm); 6KD-nr{S
DWORD size=btm.bmWidthBytes*btm.bmHeight; 1Y~'U
=9
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Ol|fdQ
BITMAPINFOHEADER bih; 9JJ6$cLF
bih.biBitCount=btm.bmBitsPixel; M&H,`gm
bih.biClrImportant=0; }ov>b2H#<
bih.biClrUsed=0; t\Qm2Q)>
bih.biCompression=0; Wvl'O'R
bih.biHeight=btm.bmHeight; eW}-UeT
bih.biPlanes=1; OqmW lN.?
bih.biSize=sizeof(BITMAPINFOHEADER); 1'dZ?`O
bih.biSizeImage=size; [MKt\(
bih.biWidth=btm.bmWidth; |8GLS4.]t
bih.biXPelsPerMeter=0; ZU2D.Kf_:
bih.biYPelsPerMeter=0; ;4Xx5*E
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); eiRVw5g
static int filecount=0; ;<xPzf
CString name; 7vI
ROK~
name.Format("pict%04d.bmp",filecount++); e:_[0#
name=m_Path+name; yC4%z)t&R
BITMAPFILEHEADER bfh; g9d/nRX&
bfh.bfReserved1=bfh.bfReserved2=0; G(t&(t`[
bfh.bfType=((WORD)('M'<< 8)|'B'); ]"j%:fr
bfh.bfSize=54+size; Ln/*lLIOb
bfh.bfOffBits=54; HW"5MZ8E
CFile bf; w7vQ6jkH
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ BIg2`95F|
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); jW[EjhsH
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); mJH4M9WJ]
bf.WriteHuge(lpData,size); %?8.UW\m
bf.Close(); LJt5?zQKrW
nCount++; r]wy-GT
} 0G+qF96
GlobalFreePtr(lpData); >N}+O<Fc
if(nCount==1) /1= x8Sb
m_Number.Format("%d picture captured.",nCount); 4FKgp|Y0
else |O"Pb`V+
m_Number.Format("%d pictures captured.",nCount); Z 8GIZ
UpdateData(FALSE); !thFayq
} T ~p>Ed 9
H;Gs0Qi;
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) %Rk0sfLvn
{ *0r!eD
if(pMsg -> message == WM_KEYDOWN) <\d2)Iv
{ |>>^Mol
if(pMsg -> wParam == VK_ESCAPE) |]-~yYqP3
return TRUE; gxC`Ml
if(pMsg -> wParam == VK_RETURN) #ZHKq7
return TRUE; sp0_f;bC
} `;m0GU68
return CDialog::PreTranslateMessage(pMsg); f&&Ao
} E|6@h8#
2t=&h|6EW
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l9H-N*Wx
{ jX t5.9 t
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 9R&.$5[W(s
SaveBmp(); (;HO3Z".q$
return FALSE; ?~]mOv>
} QP@@h4J^
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ a"k,x-EL(
CMenu pop; :U @L$
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); u =(.}
CMenu*pMenu=pop.GetSubMenu(0); 7&V3f=aj6
pMenu->SetDefaultItem(ID_EXITICON); ?b]f$
2
CPoint pt; azTiY@/
GetCursorPos(&pt); Cth<x n(Q
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); $u)#-X;x
if(id==ID_EXITICON) .ffr2\'*
DeleteIcon(); _e|-O>#pl
else if(id==ID_EXIT) mxwG~a'_
OnCancel(); Kf6D$}
return FALSE; V:g XP1P
} oV~S4|9:
LRESULT res= CDialog::WindowProc(message, wParam, lParam); eN m
Wul
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) B{V(g"dM
AddIcon(); mt-t8~A
return res; gf8~Zlq4v
} mx2Ov u
dmMrZ1u2
void CCaptureDlg::AddIcon() MLmv+
{ ;y>}LGG
NOTIFYICONDATA data; ]\3<UL
data.cbSize=sizeof(NOTIFYICONDATA); g_"B:DR
CString tip; @ZcI]G%
tip.LoadString(IDS_ICONTIP); 8BnsYy)j
data.hIcon=GetIcon(0); GbC JGqOR
data.hWnd=GetSafeHwnd(); |j$$0N
strcpy(data.szTip,tip); xp"F)6
data.uCallbackMessage=IDM_SHELL; &Hl
w2^
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; :,'.b|Tl.b
data.uID=98; GGGz7_s
?
Shell_NotifyIcon(NIM_ADD,&data); (T.g""N~`
ShowWindow(SW_HIDE); qp/nWGj
bTray=TRUE; X>MDX.Z
} >V&GL{
2(Nf$?U@0
void CCaptureDlg::DeleteIcon() ' KNg;
{ BR~+CBH
NOTIFYICONDATA data; Q+E)_5_sA
data.cbSize=sizeof(NOTIFYICONDATA); =jRC4]M})
data.hWnd=GetSafeHwnd(); hOm0ND?;1
data.uID=98; _P=L| U#C
Shell_NotifyIcon(NIM_DELETE,&data); s>ZlW:jY
ShowWindow(SW_SHOW); H*&!$s.
SetForegroundWindow(); Ys@\~?ym+
ShowWindow(SW_SHOWNORMAL); [iN\R+:
bTray=FALSE; R!:F}*
} 9]a!1
'5P:;zw
void CCaptureDlg::OnChange() +3-f$/po
{ VQ4rEO=t
RegisterHotkey(); %nj{eT
} F\+!\b*lP
I$I',x5Z
BOOL CCaptureDlg::RegisterHotkey() ZV~9{E8
{ (gUxS.zU
UpdateData(); q&: t$tSS
UCHAR mask=0; 5g
phza
UCHAR key=0; 6
$+b2&V
if(m_bControl) {Ytqs(`
mask|=4; '\Uy;,tu /
if(m_bAlt) gCW
{$d1=
mask|=2; W_|7hwr
if(m_bShift) <{k8 K6
mask|=1; h.aXW]]}(P
key=Key_Table[m_Key.GetCurSel()]; C.hRL4+;Zm
if(bRegistered){ #lx(F3
DeleteHotkey(GetSafeHwnd(),cKey,cMask); z;EDyd,O>
bRegistered=FALSE; * l-F
} /Au7X'}
cMask=mask; 8Y~\:3&1<
cKey=key; Hr=?_Un"
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); w#RfD
return bRegistered; .&n;S';"
} e `IL7$
[J43]
四、小结 4 _Idf
jGOE
CKP
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。