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:
n*i'v tQ8
CxA\yG3L& 一、实现方法
7vpN6YP -j`!(IJ 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:
Wbn[Q2h5 Q P=[ Vw #pragma data_seg("shareddata")
$JhZ'Z HHOOK hHook =NULL; //钩子句柄
k=mT! UINT nHookCount =0; //挂接的程序数目
n;kciTD%wK static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
('**nP
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
!P~ PF:W~| static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
h lkvk]v static int KeyCount =0;
(}FW])y static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
{ 0%TMiVf #pragma data_seg()
~0F9x9V a()6bRc~T 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
BgkB x {Bq"$M!Y 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:
9]L! . [7e{=\`= BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
;o)=XEh8P cKey,UCHAR cMask)
]]uzl0LH {
:PD`PgQ BOOL bAdded=FALSE;
`\ef0 for(int index=0;index<MAX_KEY;index++){
}(+=/$C"# if(hCallWnd[index]==0){
P~\a)Szy hCallWnd[index]=hWnd;
].-J. HotKey[index]=cKey;
prlyaq;4 HotKeyMask[index]=cMask;
Wj4^W<IO bAdded=TRUE;
! 2Xr~u7a KeyCount++;
rv,NQZ break;
A3MZxu=':3 }
NF/Ti5y }
[W9e>Nsp0 return bAdded;
V5u}C-o }
D/S>w(= //删除热键
M9Nk=s! 3 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
UAx.Qq {
%oh`EGmVP BOOL bRemoved=FALSE;
m@G<ZCMZ for(int index=0;index<MAX_KEY;index++){
FDVI>HK @ if(hCallWnd[index]==hWnd){
E/~"j if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
N753 hCallWnd[index]=NULL;
&e-#|p#v HotKey[index]=0;
Z6IJ o%s HotKeyMask[index]=0;
]_ejDN\>{V bRemoved=TRUE;
cuQ7kECV KeyCount--;
~m?74^ i break;
b(#"w[| }
FDF3zzP0 }
<.r ]dCf }
qe5tcv}u return bRemoved;
I&pr_~. }
!F+|Y"c .DDg%z lL(p]!K' DLL中的钩子函数如下:
lh,ylh ?iPZsV LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
/nC{)s?S' {
p}YI#f
in/ BOOL bProcessed=FALSE;
#Mj$o;SX if(HC_ACTION==nCode)
,7^d9v3t {
r,2Xu if((lParam&0xc0000000)==0xc0000000){// 有键松开
$` Z>Lm* switch(wParam)
S'Z70 zJ {
dGbU{#"3s case VK_MENU:
2^)D
.& MaskBits&=~ALTBIT;
=vqsd4 break;
KInUe(g<9M case VK_CONTROL:
^&+zA,aL,A MaskBits&=~CTRLBIT;
7tpAZ<{ break;
MxO
W)$f case VK_SHIFT:
3>-[B`dD( MaskBits&=~SHIFTBIT;
y|q@;*rGNa break;
jlu`lG*e& default: //judge the key and send message
(NH8AS< break;
@-'/__cgt }
^M`>YOU2+ for(int index=0;index<MAX_KEY;index++){
xwTijSj if(hCallWnd[index]==NULL)
`z9)YH continue;
42rj6m\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
fL ~1 {
r NxrQ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
K\RWC4 bProcessed=TRUE;
J+ Jt4 }
AMbKN2h1f }
`Y\gSUhzS }
yGb a else if((lParam&0xc000ffff)==1){ //有键按下
F&=I7i switch(wParam)
S~+O`y^ {
E2^ KK:4s case VK_MENU:
WGH%92 MaskBits|=ALTBIT;
U7^7/s/. break;
i&'#+f4t case VK_CONTROL:
zP_ ] MaskBits|=CTRLBIT;
E]?)FH<oP break;
<Q2u)m' case VK_SHIFT:
kCj`V2go MaskBits|=SHIFTBIT;
N]B)Fb break;
VZ\O9lD default: //judge the key and send message
^oS$>6| break;
X AQGG> }
PT3>E5`N u for(int index=0;index<MAX_KEY;index++){
_Zh2eXWdjM if(hCallWnd[index]==NULL)
4bP13f continue;
$Mdbto~ < if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
LtC~)R {
R<"2%oY SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
%tT"`%(+ bProcessed=TRUE;
%lN2n,AK }
!\QeBd+ }
%b=Y
<v }
`_|aeoK_ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
L
;6b+I for(int index=0;index<MAX_KEY;index++){
u3U4UK if(hCallWnd[index]==NULL)
30D:ZmlY continue;
Z:K+I+:t if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
$z*@2Non SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
+ c`AE //lParam的意义可看MSDN中WM_KEYDOWN部分
M2}np }
Vwjk[ DOL }
ov8
ByJc }
{}V$`L8 return CallNextHookEx( hHook, nCode, wParam, lParam );
7; p4Wg7k} }
}$l8d/_$[ Ve)ClH/DW 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:
Eu|sWdmf
l TI}}1ScA' BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
m;dm|4L^ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Sa L"!uAk +}P%HH]E/p 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:
<"<Mbbp &,J*_F<s2< LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
M|d={o9Hp {
djWcbC=g_ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
hw;0t,1 {
'iJDWxCD //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
KE<kj$
SaveBmp();
aYqm0HCT return FALSE;
:pRF*^eU }
+#4]o
}6G …… //其它处理及默认处理
cv2]* }
5UE409Gn' <$%ql'= j.DHqHx 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。
T.kyV| kBo;h.[l 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。
N#4N?BBP" ]nQ+nH 二、编程步骤
X/l;s o+NMA
( 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";
mb&lCd^- y,Jh@n';| 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
k0L] R5W _pW_G1U 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;
Av o|v> Mi]I:ka 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;
(?vK_{ 8!&nKy<Y 5、 添加代码,编译运行程序。
C6|(ktt uVGa(4u} 三、程序代码
xRlYr# % B@ {&< ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
F|Q H #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
3V?817&6z #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
) V36t{ #if _MSC_VER > 1000
1]T|6N? #pragma once
{6h|6.S2 #endif // _MSC_VER > 1000
e'34Pw!m #ifndef __AFXWIN_H__
Pe}PH
I #error include 'stdafx.h' before including this file for PCH
gw^'{b #endif
;\qXbL7 #include "resource.h" // main symbols
dy<27 = class CHookApp : public CWinApp
>.e+S?o {
Z,
T#, public:
y%S})9 CHookApp();
" !-Kd'V // Overrides
h./P\eDc // ClassWizard generated virtual function overrides
yoQ\lk //{{AFX_VIRTUAL(CHookApp)
C`QzT{6! public:
XV>@B $hu virtual BOOL InitInstance();
:Xfn@>;3ui virtual int ExitInstance();
}$&xTW_ //}}AFX_VIRTUAL
]3ifdGk //{{AFX_MSG(CHookApp)
%?9Ok // NOTE - the ClassWizard will add and remove member functions here.
z\T Lsx // DO NOT EDIT what you see in these blocks of generated code !
^z~~VBv //}}AFX_MSG
+6l]] *H DECLARE_MESSAGE_MAP()
0}]SUe^ };
'H|~u&? LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
gzf-)J BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
wC`;f5-> BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
4r&f%caU BOOL InitHotkey();
oh~:, BOOL UnInit();
+BL{@,zr #endif
$ J1f.YE -:<lkq&/ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
[|RjHGf #include "stdafx.h"
| kXm}K #include "hook.h"
};b1aha G #include <windowsx.h>
iidT~l #ifdef _DEBUG
/7/0x ./{ #define new DEBUG_NEW
FJ54S #undef THIS_FILE
1$pb (OK static char THIS_FILE[] = __FILE__;
XN;&qR^j #endif
gl8Ib<{ #define MAX_KEY 100
Q`ME@vz #define CTRLBIT 0x04
S_b/DO #define ALTBIT 0x02
q/PNJ#< #define SHIFTBIT 0x01
^A9M;q #pragma data_seg("shareddata")
p=Y>i 'CG HHOOK hHook =NULL;
;b0NGa(k UINT nHookCount =0;
;a
r><w static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Elb aFbr static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
,DQjDMjrf static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
O=}g4c static int KeyCount =0;
XRtD< jlA" static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
'wQv3; #pragma data_seg()
^U@~+dw HINSTANCE hins;
T%IK/"N|+ void VerifyWindow();
"& 25D BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
TQ]dW //{{AFX_MSG_MAP(CHookApp)
Z9K})47T // NOTE - the ClassWizard will add and remove mapping macros here.
gb" 4B%Hm // DO NOT EDIT what you see in these blocks of generated code!
-SCM:j%h //}}AFX_MSG_MAP
~F!,PM/ END_MESSAGE_MAP()
r.yK, Z>P*@S,6G CHookApp::CHookApp()
$_Nf-:D* {
4_^[=p/R // TODO: add construction code here,
nh.32q] // Place all significant initialization in InitInstance
pQa:pX }
' cIEc1y /7"I#U^u/ CHookApp theApp;
FX}Gt= LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
ezm&]F` {
n3KI+I%nQ BOOL bProcessed=FALSE;
(xpn`NA if(HC_ACTION==nCode)
*O~e
T {
=QOg 6 if((lParam&0xc0000000)==0xc0000000){// Key up
5(m(xo6 switch(wParam)
`yiC=$*[ {
iE].&>w case VK_MENU:
F@YKFk+a MaskBits&=~ALTBIT;
646JDX[o break;
g)"gw+ZFc case VK_CONTROL:
6 %Mt MaskBits&=~CTRLBIT;
12UD19! break;
m Y,|J\w@ case VK_SHIFT:
v,@F|c?_S MaskBits&=~SHIFTBIT;
?-)I+EAnE break;
]?+{aS-]?k default: //judge the key and send message
jgv`>o%<W break;
>ut" OL9J }
i^msjA for(int index=0;index<MAX_KEY;index++){
ac{?+]8} if(hCallWnd[index]==NULL)
L%"LlSg continue;
C[sh, if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6gL-OJNo {
iUi>y.}"P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
^teq[l$; bProcessed=TRUE;
p4!:]0c }
Q\ppfc{, }
/] ^#b }
8^/I>0EZ else if((lParam&0xc000ffff)==1){ //Key down
sgUud_r)4 switch(wParam)
*ISZlR\# {
!]yO^Ob.E case VK_MENU:
zAzP,1$? MaskBits|=ALTBIT;
&ANP`= break;
')Y'c case VK_CONTROL:
tBbOY}.VD MaskBits|=CTRLBIT;
yw-8#y break;
>Gml4vGK case VK_SHIFT:
%QmxA
7fW MaskBits|=SHIFTBIT;
Zdc63fllM break;
W,5Hx1z R default: //judge the key and send message
W !w, f; break;
XRx+Dddt; }
EOj"V'! for(int index=0;index<MAX_KEY;index++)
b?X.U}62_ {
/P|fB]p if(hCallWnd[index]==NULL)
Fb`a~c~s continue;
<7SpEVQ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
RD7^& {
sUJ%x#u}Fk SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
)SF}2?7e bProcessed=TRUE;
b//B8^Eong }
x+8_4>,>Y7 }
%ts^Z*3u }
2Y\
d<.M if(!bProcessed){
Mips.Bx for(int index=0;index<MAX_KEY;index++){
D"(L5jR8m@ if(hCallWnd[index]==NULL)
-VxTx^)> continue;
#'D"
'B if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
eV:9y SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
C?v[Z]t }
ZYU=\ }
zi R5:d3 }
#6Fez`A return CallNextHookEx( hHook, nCode, wParam, lParam );
'm1N/)F }
,mhQ"\ +C R'EUV0KX>Y BOOL InitHotkey()
LEMfG~Czq {
VVH.2&`I if(hHook!=NULL){
IN8>ZV`j) nHookCount++;
00v&lQBW return TRUE;
]^':Bmq }
F'jWV5"* else
]H-S,lmV hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
%~L>1ShtU if(hHook!=NULL)
gb
^?l~SS nHookCount++;
M FTkqbc return (hHook!=NULL);
;<yd^Xs }
'o|30LzYgQ BOOL UnInit()
k.("3R6v: {
SDu#Yt&mhh if(nHookCount>1){
7S/G
B nHookCount--;
- p3Re9 return TRUE;
,@1p$n }
(?_S6HE BOOL unhooked = UnhookWindowsHookEx(hHook);
qmO6,T-| if(unhooked==TRUE){
-F'b8:m nHookCount=0;
8Ac)'2t;U hHook=NULL;
Bm&kkx.9P }
3_~cMlr3T. return unhooked;
yjfat&$ }
~\{^%~[48 *Qugv^- BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~U;rw&'H {
5N%93{L BOOL bAdded=FALSE;
hxCvk/7sT for(int index=0;index<MAX_KEY;index++){
}|PY!O
if(hCallWnd[index]==0){
/}Jj hCallWnd[index]=hWnd;
ono4U.C9 HotKey[index]=cKey;
3a.kBzus HotKeyMask[index]=cMask;
:Y9NLbv bAdded=TRUE;
f$NM M
>z KeyCount++;
=t6z \WB break;
[2"<W!p }
T] 2q?;N }
:'#TCDlOb return bAdded;
TXe$<4" }
XsnF~)YW t#q<n:WeYU BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
aW>6NDq( {
$<:E'^SAS BOOL bRemoved=FALSE;
`PY>Hgb for(int index=0;index<MAX_KEY;index++){
[9Ss#~ if(hCallWnd[index]==hWnd){
sC9&Dgkk if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
TMYd47 hCallWnd[index]=NULL;
A&nU]R8S HotKey[index]=0;
gy&[?m6M= HotKeyMask[index]=0;
W5SJ^,d)J bRemoved=TRUE;
|V<h=D5W KeyCount--;
035rPT7-2- break;
v|U(+O }
G:zua`u[ }
Me
5_4H&Sg }
|SyMngIY return bRemoved;
r*Yi1j/ }
}Ho Qwy|& ^^5&QSB:' void VerifyWindow()
8Y5 {
**}h&k&%2 for(int i=0;i<MAX_KEY;i++){
,3@#F/c3i~ if(hCallWnd
!=NULL){ In`mtn q
if(!IsWindow(hCallWnd)){ ]Kr
`9r),
hCallWnd=NULL; 4~B>
9<$e>
HotKey=0; NH+(?TN
HotKeyMask=0; 27;ci:5
KeyCount--; OKoan$#sn
} OE}*2P/M>
} N^3N[lD{
} Fd0%lnui
} !?|Th5e
CiB%B`,N
BOOL CHookApp::InitInstance() ,?L2wl[
{ ki85!k=Q2
AFX_MANAGE_STATE(AfxGetStaticModuleState()); % LJs
hins=AfxGetInstanceHandle(); $m42:a mM
InitHotkey(); \Ym5<];E
return CWinApp::InitInstance(); x
g0iN'e'K
} ,_Z+8
j?MAED
int CHookApp::ExitInstance() By% =W5
{ 3-&QRR#p
VerifyWindow(); [7[0^ad
UnInit(); !Y-98<|b
M
return CWinApp::ExitInstance(); |+T1XYG5
} ztw@Y|<2
V O3x~E
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 8QM(?A
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) D:erBMKv,
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ u,&^&0K,
#if _MSC_VER > 1000 ^k]XEW{PG
#pragma once *hw\35%P`?
#endif // _MSC_VER > 1000 b[`Yi1^]%g
'_V2!?+RU+
class CCaptureDlg : public CDialog t^w"w`v\u
{ p\bDY
// Construction ~$~5qwl
public: p\<u6v ~J
BOOL bTray; %"P,1&\^
BOOL bRegistered; Dc_yM
BOOL RegisterHotkey(); @;'o2
UCHAR cKey; C+TI]{t
UCHAR cMask; qzTuxo0B
void DeleteIcon(); )a-Du$kd
void AddIcon(); "sG=wjcw^
UINT nCount; E@ESl0a;
void SaveBmp(); nJo`B4'U
CCaptureDlg(CWnd* pParent = NULL); // standard constructor NUp<e%zB
// Dialog Data %@u;5qD&
//{{AFX_DATA(CCaptureDlg) Sv +IS
enum { IDD = IDD_CAPTURE_DIALOG };
OVV]x{
CComboBox m_Key; NgY=&W,
BOOL m_bControl; d!$Z(W0
BOOL m_bAlt; 7k rUKYVo
BOOL m_bShift; _]Zs,Hy
CString m_Path; <N%7|t*eT
CString m_Number; #W|'1
OX4
//}}AFX_DATA R=|{n'n$0|
// ClassWizard generated virtual function overrides ;1a~pF S
//{{AFX_VIRTUAL(CCaptureDlg) !1ED~3/X
public: BW"5Aj
virtual BOOL PreTranslateMessage(MSG* pMsg); C_7+a@?B
protected: t]YC"%[S
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support sJDas,7>
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); v-PXZ'7~
//}}AFX_VIRTUAL {|'E
// Implementation ZSG9t2qlv
protected: 9<>wIl*T`
HICON m_hIcon; *FM Mjz
// Generated message map functions |6$p;Aar
//{{AFX_MSG(CCaptureDlg) (_"*NY0
virtual BOOL OnInitDialog(); AT%u%cE-
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ' hs2RSq
afx_msg void OnPaint(); @w?P7P<O`
afx_msg HCURSOR OnQueryDragIcon(); #Jw1IcuH
virtual void OnCancel(); *"{lMZ+
afx_msg void OnAbout(); C<P%CG&;
afx_msg void OnBrowse(); 2Tagr1L
afx_msg void OnChange(); 7:2WgLo
//}}AFX_MSG F~P%AjAx'
DECLARE_MESSAGE_MAP() w$Rro)?}7
}; ?W)A
#endif |g//g\dd
|y2w9n0D
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file k@'#@
t
#include "stdafx.h" smnSDS
#include "Capture.h" oIduxbAp
#include "CaptureDlg.h" `-p:vq`
#include <windowsx.h> OEkN(wF
#pragma comment(lib,"hook.lib") LS917ci-
#ifdef _DEBUG wf:OK[r9
#define new DEBUG_NEW -&-Ma,M?
#undef THIS_FILE +>r/ 0b
static char THIS_FILE[] = __FILE__; c\Q7"!e
#endif nuw70*ell
#define IDM_SHELL WM_USER+1 W#hj 1
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =,UWX3`f
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ac<Phy-J
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; LL3#5AA"k|
class CAboutDlg : public CDialog "*Tb"
'O
{ vuoQz\
public: {\:{[{qF
CAboutDlg(); 6,0_)O}\b
// Dialog Data 5Er2}KZJv,
//{{AFX_DATA(CAboutDlg) *^:N.&]
enum { IDD = IDD_ABOUTBOX }; \Z+z?K O
//}}AFX_DATA #3+!ee27#
// ClassWizard generated virtual function overrides FSA1gAW6g
//{{AFX_VIRTUAL(CAboutDlg) '7iSp=
protected: )3>hhuaa
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {qN 5MsY
//}}AFX_VIRTUAL %'X[^W
// Implementation 6x%h6<#xh*
protected: |\7
ET[Xq
//{{AFX_MSG(CAboutDlg) :>Ay^{vf=
//}}AFX_MSG L2[f]J%
DECLARE_MESSAGE_MAP() %@6}GmK^
}; jW
3c"
#~<0t(3Q
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (aH'h1,G
{ 9R7A8
//{{AFX_DATA_INIT(CAboutDlg) z}MP)|aH:
//}}AFX_DATA_INIT /,g ,Ch<d
} 'coV^~qy
pLLGus+W
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Bi
@2
{ @
<
Q|5
CDialog::DoDataExchange(pDX); n6BQk2l
//{{AFX_DATA_MAP(CAboutDlg) m>MB7,C;N
//}}AFX_DATA_MAP BEre*J
} !Ikt '5/
]% IT|/;9Y
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) (adyZ/j
//{{AFX_MSG_MAP(CAboutDlg) v#U"pn|M
// No message handlers 7G/1VeVjB
//}}AFX_MSG_MAP Pc
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END_MESSAGE_MAP() YJJB.hR+
IX>d`O61*g
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Yq%9M=#k
: CDialog(CCaptureDlg::IDD, pParent) <gQIq{B?
{ IrqZi1
//{{AFX_DATA_INIT(CCaptureDlg) ):b$xNn
m_bControl = FALSE; TX&Jt%
m_bAlt = FALSE; 1$p2}Bf{n
m_bShift = FALSE; Q|D @Yd\
m_Path = _T("c:\\"); IVAmV!.z
m_Number = _T("0 picture captured."); 7~5ym15*
nCount=0; wfq7ob4^
bRegistered=FALSE; /#m=*&!CB
bTray=FALSE; &L,nqc\3D5
//}}AFX_DATA_INIT
+7=K/[9p
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 z<##g
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); mjKS{
} Yd#/1!A7u
-bSSP!f
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) CTZh0x
{ A^y|J`k|
CDialog::DoDataExchange(pDX); }wHW7SJ
//{{AFX_DATA_MAP(CCaptureDlg) *fn*h[pV&
DDX_Control(pDX, IDC_KEY, m_Key); 5a hVeY
DDX_Check(pDX, IDC_CONTROL, m_bControl); ;;:-l99
DDX_Check(pDX, IDC_ALT, m_bAlt); &QGdLXOn
DDX_Check(pDX, IDC_SHIFT, m_bShift); b"vv>Q~U
DDX_Text(pDX, IDC_PATH, m_Path); V;:j ZpG
DDX_Text(pDX, IDC_NUMBER, m_Number); P8*=Ls+-F
//}}AFX_DATA_MAP
l%1!a
} 'gTb A?+@5
RF%KA[Dj
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) DUC#NZgw
//{{AFX_MSG_MAP(CCaptureDlg) !>zo_fP
ON_WM_SYSCOMMAND() 4'!c*@Y
ON_WM_PAINT() .U?'i<
ON_WM_QUERYDRAGICON() OslL~<
ON_BN_CLICKED(ID_ABOUT, OnAbout) JU^lyi!
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]Zyur`
ON_BN_CLICKED(ID_CHANGE, OnChange) dAkgR~
//}}AFX_MSG_MAP @jsDq
Ln
END_MESSAGE_MAP() enSXP~9w
OeS\7
BOOL CCaptureDlg::OnInitDialog()
ng_^
{ y*tZ
!m2Gg
CDialog::OnInitDialog(); 2M68CE
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7]||UuF<
ASSERT(IDM_ABOUTBOX < 0xF000); 'Pn3%&O$
CMenu* pSysMenu = GetSystemMenu(FALSE); -8j+s}Q
if (pSysMenu != NULL) ,u`YT%&L
{ Od5JG .]
CString strAboutMenu; q(2K6
strAboutMenu.LoadString(IDS_ABOUTBOX); d\
1Og\U|A
if (!strAboutMenu.IsEmpty()) BE_ay-
{ uoX:^'q
pSysMenu->AppendMenu(MF_SEPARATOR); b;cdIl!3
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); vfE6Ggz
} 37|&?||
} JQ6zVS2SSS
SetIcon(m_hIcon, TRUE); // Set big icon Od%"B\
SetIcon(m_hIcon, FALSE); // Set small icon 8\5 T3AF
m_Key.SetCurSel(0); zY('t!u8
RegisterHotkey(); QUQu^p
CMenu* pMenu=GetSystemMenu(FALSE); f v9V7
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); f,:9N 5Z
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2VE9}%i
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); cxr=k%~}J
return TRUE; // return TRUE unless you set the focus to a control 2|}+T6_q
} 0^RXGN
gm[z[~X@
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) D~$r\]av
{ ~R2 6
if ((nID & 0xFFF0) == IDM_ABOUTBOX) /|eA9 ]
{ =yyp?WmC8
CAboutDlg dlgAbout; j"'(sW-
dlgAbout.DoModal(); p~,]*y:XT
} >w^YO25q
else m/y2WlcRx
{ .sj^{kGE
CDialog::OnSysCommand(nID, lParam); R]btAu;Z
} GP:77)b5
} XAe%m^
2VJR$Pao
void CCaptureDlg::OnPaint() IuRmEL_Q_
{ X7i/fm{l'
if (IsIconic()) 52,m:EhL
{ fIwV\,s
CPaintDC dc(this); // device context for painting \,7}mdQSv
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); j(k:
@
// Center icon in client rectangle
GrAujc5|
int cxIcon = GetSystemMetrics(SM_CXICON); P}TI
q#
int cyIcon = GetSystemMetrics(SM_CYICON); K?zH35f$
CRect rect; g;8jK8Kh
GetClientRect(&rect); JMz;BAHT
int x = (rect.Width() - cxIcon + 1) / 2; ,eZ1uBI?
int y = (rect.Height() - cyIcon + 1) / 2; \&i P`v`K
// Draw the icon a8i]]1Blz
dc.DrawIcon(x, y, m_hIcon); 3MY(<TGX
} Ie`13 L2
else vL\&6n~M>
{ cgm~>
CDialog::OnPaint(); %JHGiCv|
} 75T7+:p
} NNE<L;u
g)_e]&
HCURSOR CCaptureDlg::OnQueryDragIcon() '
)?f{
{ }c`fW&
return (HCURSOR) m_hIcon; (''M{n
} <Gt2(;
1I<rXY(a`
void CCaptureDlg::OnCancel() {6c2{@
{ r!HwXeEn/
if(bTray) JoN\]JL\,
DeleteIcon(); -xDGH
CDialog::OnCancel(); L.2/*H#
} ""1^k2fj
CFqJ/''
void CCaptureDlg::OnAbout() "E8zh|m o
{ J]G?Rc
CAboutDlg dlg; w -
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dlg.DoModal(); G-He" 4& $
} OV%Q3$15
O km{Xx
void CCaptureDlg::OnBrowse() C_n9T{k
{
2;^y4ssg
CString str; Nv/v$Z{k
BROWSEINFO bi; y7$iOR
char name[MAX_PATH]; 6C-/`>m
ZeroMemory(&bi,sizeof(BROWSEINFO)); m"fNK$_d
bi.hwndOwner=GetSafeHwnd(); B,K>rCZ/
bi.pszDisplayName=name; FcRW;e8-
bi.lpszTitle="Select folder"; ld^=#]g
bi.ulFlags=BIF_RETURNONLYFSDIRS; rSHpS`\ou
LPITEMIDLIST idl=SHBrowseForFolder(&bi); }*ZHgf]~#
if(idl==NULL) 4&_NJ\
return; niqN{
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &/uu)v
str.ReleaseBuffer(); -GqT7`:(H4
m_Path=str; 8 XICF
if(str.GetAt(str.GetLength()-1)!='\\') #DN0T' B
m_Path+="\\"; ~<k,#^"}X
UpdateData(FALSE); @*qz(h]\
} qnoNT%xazo
E/09hD Q
void CCaptureDlg::SaveBmp() Z7_ zMM
{ g q}I[N
CDC dc; Pp|*J^U 4
dc.CreateDC("DISPLAY",NULL,NULL,NULL); -,+q#F
CBitmap bm; 8S<@"v
int Width=GetSystemMetrics(SM_CXSCREEN); @E-\ J7 yh
int Height=GetSystemMetrics(SM_CYSCREEN); qqu.EE
bm.CreateCompatibleBitmap(&dc,Width,Height); wAz&"rS
CDC tdc; L}FOjrN
tdc.CreateCompatibleDC(&dc); jWY$5Vq<H
CBitmap*pOld=tdc.SelectObject(&bm); 13+<Q \
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); lr{?"tl_
tdc.SelectObject(pOld); <7n4_RlF!
BITMAP btm; L9@&2?k
bm.GetBitmap(&btm); 9!Ar`Io2@
DWORD size=btm.bmWidthBytes*btm.bmHeight; GG0R}',0
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); UH"#2< |b
BITMAPINFOHEADER bih; KMV=%o
bih.biBitCount=btm.bmBitsPixel; hTM[8 ~<^
bih.biClrImportant=0; $YXMI",tt<
bih.biClrUsed=0; 7As|Ns`
bih.biCompression=0; v9D22,K-
bih.biHeight=btm.bmHeight; x&`~R>5/
bih.biPlanes=1; h[?O+Z^
bih.biSize=sizeof(BITMAPINFOHEADER); d5>H3D{49
bih.biSizeImage=size; (C\hVy2X?N
bih.biWidth=btm.bmWidth; jC3Vbm&ZZ
bih.biXPelsPerMeter=0; P{5-Mx!{&
bih.biYPelsPerMeter=0; 6}(J6T46M[
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); p<&Xd}]"^W
static int filecount=0; @0eHS+
CString name; <N`J`J-[
name.Format("pict%04d.bmp",filecount++); PI~1GyJr@;
name=m_Path+name; [b/k3&O'
BITMAPFILEHEADER bfh; tBm_YP[
bfh.bfReserved1=bfh.bfReserved2=0; i:cXwQG}B
bfh.bfType=((WORD)('M'<< 8)|'B'); Hzhceeh_+
bfh.bfSize=54+size; e+]6OV&+
bfh.bfOffBits=54; m "M("%
CFile bf; ncX/L[L
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 0UH*\<R
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "
beQZG
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +R\vgE68
bf.WriteHuge(lpData,size); c(/VYMJZ&
bf.Close(); shH~4<15
nCount++; Khe!g1=&X
} iajX ~kv
GlobalFreePtr(lpData); L3p`
if(nCount==1) 78Aa|AJU
m_Number.Format("%d picture captured.",nCount); UDc$"a}ds{
else >^OC{~Az
m_Number.Format("%d pictures captured.",nCount); R@*O!bD
UpdateData(FALSE); d7&eLLx
} +,&O1ykY
)$&dg2[
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) if)Y9:{r^
{ k` {@pt.
if(pMsg -> message == WM_KEYDOWN) yCXrVN:`,
{ 6AP~]e 8
if(pMsg -> wParam == VK_ESCAPE) ?6k}ii!c
return TRUE; %"X-&1vV
if(pMsg -> wParam == VK_RETURN) %+F"QI1~0
return TRUE; `?y<>m*
} -3&G"hfK
return CDialog::PreTranslateMessage(pMsg); M^7MU}5w
} rFZrYm
`$YP<CJeq
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) jr /lk
{ $v`afd y
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ O Lc}_
SaveBmp(); ';G1A
return FALSE; zi'Jr)n
} S/`%Q2za4
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ln.ZVMZ;
CMenu pop; Xwa_3Xm*Le
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Qe'g3z>
CMenu*pMenu=pop.GetSubMenu(0); x-'~Bu
pMenu->SetDefaultItem(ID_EXITICON); J@L9p46,
CPoint pt; S|zW^|YU
GetCursorPos(&pt); Z Dhx5SL&
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;+I/ I9~
if(id==ID_EXITICON) m3^/:<
DeleteIcon(); {3Y )rY!z
else if(id==ID_EXIT) ]}mxY
vu_i
OnCancel(); GI7=xh
return FALSE; '>k{tPi.
} |3{&@7
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \@~UDP]7
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (5<^p&
AddIcon(); ==H$zmK
return res; ZCVl5R(mZ
} M|[ZpM+
W><dYy=z5
void CCaptureDlg::AddIcon() +-a&2J;J'
{ ,SScf98,j
NOTIFYICONDATA data; u=&Bmn_
data.cbSize=sizeof(NOTIFYICONDATA); -z:&*=
CString tip; RkuuogZ
tip.LoadString(IDS_ICONTIP); 9]>iSG^H
data.hIcon=GetIcon(0); D\~e&0*
data.hWnd=GetSafeHwnd(); _ OaRY]
strcpy(data.szTip,tip); }#v{`Sn%^C
data.uCallbackMessage=IDM_SHELL;
,&YTj>
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Zw]
?.
data.uID=98; XTeb9h)3
Shell_NotifyIcon(NIM_ADD,&data); =6=_/q2
ShowWindow(SW_HIDE); %5
bTray=TRUE; _J]2~b
} *zWWmxcJa
4.K'\S
void CCaptureDlg::DeleteIcon() U,lJ"$'
{ >J=<bhR
NOTIFYICONDATA data; 1#
t6`N]?V
data.cbSize=sizeof(NOTIFYICONDATA); m~],nl
data.hWnd=GetSafeHwnd(); n^hocGH*
data.uID=98; quo^fqS&a
Shell_NotifyIcon(NIM_DELETE,&data); 6`$[Ini
ShowWindow(SW_SHOW); *]x*B@RF
SetForegroundWindow(); E4D (,s
ShowWindow(SW_SHOWNORMAL); nN3$\gHp8i
bTray=FALSE; [ut#:1h^
} Ra3ukYG[
!7U\J]
void CCaptureDlg::OnChange() JeY'8B
{ }4nT.!5
RegisterHotkey(); C2<CWPn<
} a}d6o;li
fMeZ]rb
BOOL CCaptureDlg::RegisterHotkey() M;Wha;%E"
{ )~rB}>^Z
UpdateData(); i_F$&?)
UCHAR mask=0; 1Xyp/X2rI
UCHAR key=0; |z^pL1Z]5
if(m_bControl) b>~RSO*
mask|=4; XNH4==4
if(m_bAlt) >!9h6BoGV
mask|=2; ;t]|15]u
if(m_bShift) ?A7Yk4Y.?N
mask|=1; c[0oh.
key=Key_Table[m_Key.GetCurSel()]; )9P&=
if(bRegistered){ ~H[%vdR
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ., :uZyG
bRegistered=FALSE; _1jw=5^P\i
} nDlO5 pe"d
cMask=mask; idJh^YD
cKey=key; agd)ag4"[u
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); S;A)C`X&
return bRegistered; mjEs5XCC"
} vv
7+>%
hteOh#0{
四、小结 9b6!CNe!
=Mhg
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。