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:
1{%3OG^'
l=+hs 一、实现方法
EL/~c*a/ ~1xfE C/ 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:
(x)}k&B; <V?csx/eRd #pragma data_seg("shareddata")
@-B)a Z HHOOK hHook =NULL; //钩子句柄
al#BfcZW UINT nHookCount =0; //挂接的程序数目
sn>2dRW{ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
R9+0ZoS static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
K+WbxovXU static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
lk/T|0]) static int KeyCount =0;
vMD%.tk static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Ddu1>"p-x #pragma data_seg()
F"|OcKAA}h 0[\sz>@ 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。
VPC7Dh%. 0Wd2Z-I 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:
?LxBH-o( %X|fp{C BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
_mBFmXHHS$ cKey,UCHAR cMask)
Z+8Q{|Ev {
kJP`C\4}f BOOL bAdded=FALSE;
A[7\!bq5 for(int index=0;index<MAX_KEY;index++){
p"'knZG if(hCallWnd[index]==0){
&|]GTN`E hCallWnd[index]=hWnd;
m/E$0tf HotKey[index]=cKey;
9-B/n0 HotKeyMask[index]=cMask;
e^ Aw%t bAdded=TRUE;
FqWW[Bgd KeyCount++;
d+m}Z>iQ1O break;
}Mv$Up }
P]A~:Lj }
+Oxw?`I$ return bAdded;
5u5-:#sLy }
=\ek;d0Tqb //删除热键
r(qwzUI BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}F
B]LLi {
iNO}</7? BOOL bRemoved=FALSE;
v~B
"Il for(int index=0;index<MAX_KEY;index++){
)I{~Pcq if(hCallWnd[index]==hWnd){
s*;rt if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Z=KHsMnB hCallWnd[index]=NULL;
\86:f<)P HotKey[index]=0;
GZq~Pl HotKeyMask[index]=0;
-f&m4J} E bRemoved=TRUE;
A
)q=.C#e KeyCount--;
f)_k_ < break;
z JBcz, }
gl$}t H }
w/49O;r V }
N9S?c return bRemoved;
[<nmJ-V }
;5dA QJH(( }VU7wMk DLL中的钩子函数如下:
Can:!48 NScUlR"nE LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
j6&q6C X {
#TG7WF5 BOOL bProcessed=FALSE;
xoB "hNIX if(HC_ACTION==nCode)
w3>.d(Q {
O>c2*9PM if((lParam&0xc0000000)==0xc0000000){// 有键松开
SB)Hz8< switch(wParam)
N5F+h94z] {
A+QOox]< case VK_MENU:
Io*mFa? MaskBits&=~ALTBIT;
b/]@G05>> break;
}Q1m case VK_CONTROL:
Fs_zNN MaskBits&=~CTRLBIT;
qKjUp" break;
aYmN'
POi case VK_SHIFT:
K&IHt?vh! MaskBits&=~SHIFTBIT;
Y$4dqn break;
E%&E<<nhZ default: //judge the key and send message
CBu$8]9= break;
U|jip1\ }
H1or,>GoO for(int index=0;index<MAX_KEY;index++){
+ab#2~,) if(hCallWnd[index]==NULL)
4|INy=<"t continue;
gk^`-`P if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
b8O }XB {
1,Uf-i SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
"8R\!i. bProcessed=TRUE;
_08y; _S }
b/g~;| < }
&eIwlynm }
f1wwx|b%. else if((lParam&0xc000ffff)==1){ //有键按下
O|e/(s?$ switch(wParam)
W*Gp0pX {
N
6t `45 case VK_MENU:
m^%Xl@V:c- MaskBits|=ALTBIT;
z#Cgd-^7.# break;
OlcWptM$ case VK_CONTROL:
(U_dPf MaskBits|=CTRLBIT;
F!MxC break;
"tUc case VK_SHIFT:
"o>` Y MaskBits|=SHIFTBIT;
y"nL9r.,: break;
,0^9VWZV default: //judge the key and send message
5cZKk/"Ad} break;
<=gf|( }
|n~Vpy for(int index=0;index<MAX_KEY;index++){
K-6+fgeB if(hCallWnd[index]==NULL)
rrc>O*>{i continue;
*<l9d if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#(dERET* {
F m$;p6&j SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
tK LAA+Z bProcessed=TRUE;
be(p13&od }
`\Hs{t] }
x-Fl|kwX.5 }
QV*W#K\7q if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
*OR(8; for(int index=0;index<MAX_KEY;index++){
e=4k|8 G if(hCallWnd[index]==NULL)
MtXd}/ continue;
V?C_PMa if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
W}.p, d SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
F9 4Qb} //lParam的意义可看MSDN中WM_KEYDOWN部分
{3kI~s }
3=Va0}#& }
7p+uHm }
JNSH'9!n6 return CallNextHookEx( hHook, nCode, wParam, lParam );
1+NmiGKg }
F^}n7h=qk $-R9J6NN 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
z!
DD'8r> Xb5$ijH BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
;h#nal>w@S BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
((E5w:=? }ej-Lu,b3 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:
*+>R^\uT 5c+7c@. LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
t.]c44RY {
r/BiR0$E if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
`^1&Qz> {
tX.{+yyU //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
3I.0uLjg^ SaveBmp();
oQ_n:<3X return FALSE;
cwKOE?! }
-nKBSls …… //其它处理及默认处理
?Ulc`-d }
T7!=KE_z dD}!E #zv'N 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
Xn:ac^ (??|\
&DTi 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
sow/JLlbC &`A2&mZ 二、编程步骤
\`: LPe ICI8xP}a? 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
*S>,5R0k Ea2&7 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
dL!K''24{ p!w}hB598 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
wfc[B;K\ oO)KhA?y 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
k%v/&ojI l5d>
YTK+5 5、 添加代码,编译运行程序。
,wlSNb@' TAn.5
wH9t 三、程序代码
w=H4#a?fc ?G>#'T[ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
M[ZuXH} #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
[j`-R
0Np #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Cb/?hT #if _MSC_VER > 1000
@5-+>\Hd^t #pragma once
.1C|J #endif // _MSC_VER > 1000
k<3_!?3 #ifndef __AFXWIN_H__
`[J(au$z #error include 'stdafx.h' before including this file for PCH
#O.-/&Z #endif
b1{XGK' #include "resource.h" // main symbols
fMFlY%@t class CHookApp : public CWinApp
lZupn? {
AFcA5:ja public:
I#tEDeF2 CHookApp();
i|Y_X // Overrides
"UY.;
P // ClassWizard generated virtual function overrides
4$+9k;m' //{{AFX_VIRTUAL(CHookApp)
<AB.`[" public:
T6ZJ SKM virtual BOOL InitInstance();
,-XJ@@2gM virtual int ExitInstance();
V6ioQx=K# //}}AFX_VIRTUAL
NR)[,b\v //{{AFX_MSG(CHookApp)
CQcb !T // NOTE - the ClassWizard will add and remove member functions here.
"rA:;ntz // DO NOT EDIT what you see in these blocks of generated code !
fJ3qL#' //}}AFX_MSG
YMx
zj DECLARE_MESSAGE_MAP()
;Q.g[[J/p };
$PQlaivA LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
*X^__PS] BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
x6x6N&f? BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
3*gWcPGe BOOL InitHotkey();
^Y:Q%?uB/ BOOL UnInit();
sE8.,\ #endif
pPG@_9qf m&Mvb[ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
E4'D4@\W #include "stdafx.h"
'#.:%4 #include "hook.h"
B&m?3w #include <windowsx.h>
6YZ&>`a^ #ifdef _DEBUG
wzMWuA4vX #define new DEBUG_NEW
Ye}y_W #undef THIS_FILE
n~d`PGs?f static char THIS_FILE[] = __FILE__;
}m<)$.x|P #endif
dMwVgc: #define MAX_KEY 100
XjwTjgL< #define CTRLBIT 0x04
`<>8tZS9" #define ALTBIT 0x02
2r~ Nh]( #define SHIFTBIT 0x01
XfxNyZsy&> #pragma data_seg("shareddata")
Xklp6{VH9 HHOOK hHook =NULL;
!P!|U/|c UINT nHookCount =0;
GSW{h[Op static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
'}5}wCLA static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
~^"cq
S( static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
HC8{); static int KeyCount =0;
V_(?mC static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Iq\sf-1E #pragma data_seg()
6iFd[<.*j HINSTANCE hins;
b['TRYc=: void VerifyWindow();
,9#G/nF BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
k-
sbZL //{{AFX_MSG_MAP(CHookApp)
" I@Z:[=2 // NOTE - the ClassWizard will add and remove mapping macros here.
V]PTAhc // DO NOT EDIT what you see in these blocks of generated code!
$XI5fa4Tt //}}AFX_MSG_MAP
pKMf#)qm END_MESSAGE_MAP()
"7)F";_(^ ryx<^q CHookApp::CHookApp()
@ec QVk {
_V{WXsOx( // TODO: add construction code here,
=dX*:An // Place all significant initialization in InitInstance
zoOm[X=?3 }
.#h]_% 3MjMN %{P CHookApp theApp;
@Ds? LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
xsFW F*HPs {
DI}h?Uf , BOOL bProcessed=FALSE;
!T0IMI
if(HC_ACTION==nCode)
RkLH}`# {
XR\ iQ if((lParam&0xc0000000)==0xc0000000){// Key up
>CPkL_@VZ= switch(wParam)
IHo6& {
jVRd[ case VK_MENU:
X2i<2N*@ MaskBits&=~ALTBIT;
eS@RA2
break;
LTtfOcrt case VK_CONTROL:
-r-`T
s MaskBits&=~CTRLBIT;
m ]K.0E break;
=10t3nA1$ case VK_SHIFT:
q{7s.m
> MaskBits&=~SHIFTBIT;
x el&8 ` break;
~.x!st} default: //judge the key and send message
]V@!kg(p8 break;
{=g-zsc]K }
?EX'j
> for(int index=0;index<MAX_KEY;index++){
r 'jVF'w if(hCallWnd[index]==NULL)
_n}!1(xYa` continue;
l.BSZhO$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
59^@K"J {
'*3+'> SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
o
JA58/ bProcessed=TRUE;
{.,OPR"\ }
ydns_Z }
#zy,x }
*=/XlSWF else if((lParam&0xc000ffff)==1){ //Key down
7FDraEr#f switch(wParam)
(Z,,H1L {
F'j:\F6C; case VK_MENU:
;v0sM*x%V MaskBits|=ALTBIT;
Z=F=@ <! break;
Wt3\&.n case VK_CONTROL:
\R-u+ci$ZY MaskBits|=CTRLBIT;
N M8F break;
Z@ws,f^e case VK_SHIFT:
?|hzAF"U MaskBits|=SHIFTBIT;
e#'`I^8l break;
KFV]2mFN default: //judge the key and send message
-~(0:@o ; break;
u8<=FV3 }
x:2[E- for(int index=0;index<MAX_KEY;index++)
9i`LOl:; {
tIr66'8 if(hCallWnd[index]==NULL)
3mJHk<m8T continue;
]owH [wvX if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
A:NY:#uC {
>Le
mTr SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Dea;9O bProcessed=TRUE;
F'#3wCzt }
Q49|,ou[H }
[#Yyw8V#< }
Sej$x)Q\t if(!bProcessed){
;OKQP~^iH2 for(int index=0;index<MAX_KEY;index++){
,Xh4(Gn#b if(hCallWnd[index]==NULL)
.M!
(|KE4 continue;
ttw@nv%
@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
_?r+SRFn SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
2hpx%H }
9xKFX|*$ }
f(_qcgXp }
Lw#hnLI. return CallNextHookEx( hHook, nCode, wParam, lParam );
J`mp8?;% }
.Nf*Yqs0 !J71[4t BOOL InitHotkey()
p~mB;pZ%; {
WWO jyj if(hHook!=NULL){
TRq~n7Y7C nHookCount++;
!c&^b@
yw return TRUE;
*"4<&F
S }
Rxli;blzi else
U=yD! hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
0?:ZER v if(hHook!=NULL)
]t=># nHookCount++;
u3ZG;ykM return (hHook!=NULL);
xxiLi46/ }
'RA[_Z BOOL UnInit()
e!-'O0-Kw {
~xJD3Qf if(nHookCount>1){
OS9v.pz nHookCount--;
[)Ge^yI7 return TRUE;
r"Bf@va }
zyR pHM$E BOOL unhooked = UnhookWindowsHookEx(hHook);
C}>)IH if(unhooked==TRUE){
YG8oy!Zl nHookCount=0;
zV&3l9?U hHook=NULL;
9e=*jRs]l^ }
zR
.MXr return unhooked;
7RLh#D| }
]S[r$<r$ xl9l>k6, BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
lxd<^R3i#^ {
dg!sRm1iZ: BOOL bAdded=FALSE;
UEe qk"t^ for(int index=0;index<MAX_KEY;index++){
uJO*aA{K if(hCallWnd[index]==0){
/Yh([P> hCallWnd[index]=hWnd;
Ya. $x~ HotKey[index]=cKey;
u<8Q[_E& HotKeyMask[index]=cMask;
&qU[wn:1 bAdded=TRUE;
:U*[s$ KeyCount++;
fr?eOigbl break;
'I~dJEW7 }
MQ+ek4 }
5R Hs return bAdded;
}Q=Zqlvz }
_SaK]7}m! a9I8WQ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
{k*_'0 {
qa~[fORO[ BOOL bRemoved=FALSE;
!eq]V9 for(int index=0;index<MAX_KEY;index++){
^
UzF
nW@a if(hCallWnd[index]==hWnd){
+ ND9### if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Lv4=-mWv&0 hCallWnd[index]=NULL;
'SieZIm) HotKey[index]=0;
&zp5do;m HotKeyMask[index]=0;
3u^TJt) bRemoved=TRUE;
(wfg84 KeyCount--;
p\WUk@4 break;
7S`H?},sR }
qcot
T\rq }
a#IJ<^[8 }
kC0!`$<2f) return bRemoved;
(+_J0i t }
vy#(|[pL{ f+6l0@K2 void VerifyWindow()
GCKl[<9* {
uS'ji
k} for(int i=0;i<MAX_KEY;i++){
%)D7Dr if(hCallWnd
!=NULL){ fUL"fMoU
if(!IsWindow(hCallWnd)){ f3>/6C
hCallWnd=NULL; ,2`d3u^CW
HotKey=0; {5udol5?
HotKeyMask=0; jveRiW@
KeyCount--; @\y7
9FX
} k +Oq$Pi
} {dwV-qz
} q T].,?
} `9+EhP$RS
3EvA 5K.
BOOL CHookApp::InitInstance() s]iOC6v
{ @_Zx'mTI
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 6`C27
hins=AfxGetInstanceHandle(); 7|-xM>L$A
InitHotkey(); $ZRN#x@
return CWinApp::InitInstance(); >D<=9G(a
} ;$QJnQ"R
_&/Zab5
int CHookApp::ExitInstance() Z@ kC28
{ mTfMuPPs[
VerifyWindow(); uFm-HR@4
UnInit(); "{_"NjH
return CWinApp::ExitInstance(); ^H4iHjg
} A 5 X+Z
8j}m\^si
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file wM)w[
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) I[UA' ~f
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ k%g xY% 0
#if _MSC_VER > 1000 J[H?nX9
#pragma once r!^\Q7
#endif // _MSC_VER > 1000 F47n_JV!d
i!3K G|V
class CCaptureDlg : public CDialog _kHpM :;.
{ %SGO"*_
// Construction M9#QS`G
public: p|d9g
^
BOOL bTray; 0UJ`<Bfd
BOOL bRegistered; [,^dM:E/
BOOL RegisterHotkey(); 3ms/v:\
UCHAR cKey; CD_f[u
UCHAR cMask; \z9?rvT:
void DeleteIcon(); X{}#hyYk"
void AddIcon(); 4E>(Y98
UINT nCount; Y:,R7EO{!
void SaveBmp(); }i&dZTBGW
CCaptureDlg(CWnd* pParent = NULL); // standard constructor dSVu_*y
// Dialog Data k~f+L O
//{{AFX_DATA(CCaptureDlg) +{%(_<
enum { IDD = IDD_CAPTURE_DIALOG }; \bic.0-
CComboBox m_Key; Wp}9%Mq~Jy
BOOL m_bControl; \`&pk-uW
BOOL m_bAlt; RRqMwy>%
BOOL m_bShift; ib\[ ~rg
CString m_Path; Wk?|BR]O
CString m_Number; Vb^s 'k
//}}AFX_DATA 4i/q^;`
// ClassWizard generated virtual function overrides 0>=)
//{{AFX_VIRTUAL(CCaptureDlg) J&:W4\ m
public: $
bNe0
virtual BOOL PreTranslateMessage(MSG* pMsg); Hi_Al,j:
protected: RYl3txw
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _[i=TqVmf
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !rg0U<bO!
//}}AFX_VIRTUAL @>2rz
// Implementation V6MT> T
protected: 93IOG{OAY
HICON m_hIcon; 4AOS}@~W
// Generated message map functions U;{,lS2l
//{{AFX_MSG(CCaptureDlg) C;q}3c*L
virtual BOOL OnInitDialog(); _(`X .D
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); mN{ajf)@
afx_msg void OnPaint(); `B\KS*Gya#
afx_msg HCURSOR OnQueryDragIcon(); s~Wu0%])Q
virtual void OnCancel(); `A'I/Hf5
afx_msg void OnAbout(); K#UA M.
afx_msg void OnBrowse(); -`dxx)x
afx_msg void OnChange(); u rXb!e{l
//}}AFX_MSG fslk7RlSKg
DECLARE_MESSAGE_MAP() NzAtdcwR
}; mK40 f
#endif ^la i!uZVa
v?D
kDnta
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file W(a'^
#xe
#include "stdafx.h" mnQjX ?
#include "Capture.h" 2${,%8"0s
#include "CaptureDlg.h" h2|vB+W-
#include <windowsx.h> 9U9c"'g
#pragma comment(lib,"hook.lib") V,XP&,no\j
#ifdef _DEBUG Z#Zzi5<
#define new DEBUG_NEW 4zqE?$HM'
#undef THIS_FILE \kV7NA
static char THIS_FILE[] = __FILE__; uP{+?#a_-\
#endif }'V'Y[
#define IDM_SHELL WM_USER+1 ,rFLpQl
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k]$E8[.t
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9hR:y.
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; K~Au?\{
class CAboutDlg : public CDialog r,.95@
{ J;=aIiN]R
public: av;
(b3Lq
CAboutDlg(); M,\|V3s
// Dialog Data )/WA)fWkT
//{{AFX_DATA(CAboutDlg) _UBJPb@=U
enum { IDD = IDD_ABOUTBOX }; $qlqWy-s
//}}AFX_DATA p=-B~:
// ClassWizard generated virtual function overrides F*4Qa
//{{AFX_VIRTUAL(CAboutDlg) F0BOhlK
protected: p#;dLM/EA
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iTugvb
//}}AFX_VIRTUAL <S8I"8{Mb
// Implementation *M5$ h*;v
protected: 1Fvv/Tj
//{{AFX_MSG(CAboutDlg) or!D
//}}AFX_MSG ZU|V+yT
DECLARE_MESSAGE_MAP() >OKS/(I0
}; `!,\kc1
BBU84s[
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) R5NRCI
{ 7<R6T9g
//{{AFX_DATA_INIT(CAboutDlg) C*{15!d:G
//}}AFX_DATA_INIT ##`;Eh0a
} U/3e,`c
nF. ;LM
void CAboutDlg::DoDataExchange(CDataExchange* pDX) yo?g"vbE
{ &Qtp"#{
CDialog::DoDataExchange(pDX); 0K$WSGB?6j
//{{AFX_DATA_MAP(CAboutDlg) UYcyk
$da
//}}AFX_DATA_MAP KtfkE\KP
} q-3J.VLJ5H
G {pP}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) UPVO~hB;
//{{AFX_MSG_MAP(CAboutDlg) '#McY'.D T
// No message handlers iO?gF
//}}AFX_MSG_MAP $dx1[V+_
END_MESSAGE_MAP() >uyeI&z
c69U1
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) s=q%:uCO
: CDialog(CCaptureDlg::IDD, pParent) 1&8j3"
{ c?p0#3%L#
//{{AFX_DATA_INIT(CCaptureDlg) h=v[i!U-eY
m_bControl = FALSE; [NCXn>Z
m_bAlt = FALSE;
+eDN,iv
m_bShift = FALSE; s]F?=yEp
m_Path = _T("c:\\"); iJCY /*C}
m_Number = _T("0 picture captured."); vGPf`2/j.
nCount=0; K'iS#i7
bRegistered=FALSE; {hvQ<7b
bTray=FALSE; fz<|+(_>J
//}}AFX_DATA_INIT EBj,pk5M
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 d739UhKC
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); rSF;Lp)}
} m0%iw1OsH%
/^z/]!JG:V
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) LM"W)S
{ 'FPcAW^8
CDialog::DoDataExchange(pDX); 6:|!1Pg5
//{{AFX_DATA_MAP(CCaptureDlg) <i{m.pR>
DDX_Control(pDX, IDC_KEY, m_Key); _:ZFCDO
DDX_Check(pDX, IDC_CONTROL, m_bControl); E !Oz|q
DDX_Check(pDX, IDC_ALT, m_bAlt); fR]p+\#8u*
DDX_Check(pDX, IDC_SHIFT, m_bShift); E,*JPK-A x
DDX_Text(pDX, IDC_PATH, m_Path); !~lVv&YO
DDX_Text(pDX, IDC_NUMBER, m_Number); 3P+4S|@q(4
//}}AFX_DATA_MAP 3xmiX{1e
} r%Q8)nEo
.\ ;l-U
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) r+[#%%}ea
//{{AFX_MSG_MAP(CCaptureDlg) ="5k\1W1M
ON_WM_SYSCOMMAND() r/N[7*i
ON_WM_PAINT() tAb;/tM3I
ON_WM_QUERYDRAGICON() Njy9 JX
ON_BN_CLICKED(ID_ABOUT, OnAbout) 4DQ07w
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) bK_0NrXP
ON_BN_CLICKED(ID_CHANGE, OnChange) 9D{u,Q V
//}}AFX_MSG_MAP l#2r.q^$|
END_MESSAGE_MAP() #[k~RYS3
o ;[C(OS
BOOL CCaptureDlg::OnInitDialog() YiIddQ
{ ;1{iF2jZ:
CDialog::OnInitDialog(); %Lh-aP{[e
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); wE,=%?"
ASSERT(IDM_ABOUTBOX < 0xF000); I<D&,LFH*w
CMenu* pSysMenu = GetSystemMenu(FALSE); vpeq:h
if (pSysMenu != NULL) vKU]80T
{ S 0R8'Y
CString strAboutMenu; [Vrc:%Jk
strAboutMenu.LoadString(IDS_ABOUTBOX); ;-3h ~k
if (!strAboutMenu.IsEmpty()) i63`B+L{
{ 9_J!s
pSysMenu->AppendMenu(MF_SEPARATOR); N<L$gw+)$D
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); c*S#UD+
} bGGeg%7
} 4B:\
SetIcon(m_hIcon, TRUE); // Set big icon &57qjA,8<
SetIcon(m_hIcon, FALSE); // Set small icon sowbg<D
m_Key.SetCurSel(0); `!Ua ScM
RegisterHotkey(); tIi!*u
CMenu* pMenu=GetSystemMenu(FALSE); Ap
F*a$),
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); *ajFZI
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); !7:EE,W~
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ]iz_w`I\
return TRUE; // return TRUE unless you set the focus to a control q=P
f^Xp
} 652u Z};e
bjM-Hd/K
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) K?h[.`}
{ (,- 5(fW
if ((nID & 0xFFF0) == IDM_ABOUTBOX) g2[K<
{ L0X&03e=e:
CAboutDlg dlgAbout; *fxep08B
dlgAbout.DoModal(); F`YFo)W
} X0^zw^2W
else X)FL[RO%q
{ _N>wzkJ
CDialog::OnSysCommand(nID, lParam); kN'|,eKH4
} w;N{>)hv
} w"fCI13
/`7 I K
void CCaptureDlg::OnPaint() E0sbU<11
{ "_nX5J9
if (IsIconic()) +G5'kYzJ
{ 4ggVj*{v
CPaintDC dc(this); // device context for painting z{Hz;m:*_
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $?H]S]#|}.
// Center icon in client rectangle M?E9N{t8)a
int cxIcon = GetSystemMetrics(SM_CXICON); _Ct}%-,4
int cyIcon = GetSystemMetrics(SM_CYICON); H"Q(2I
CRect rect; ggrI>vaw
GetClientRect(&rect); j G+T.
int x = (rect.Width() - cxIcon + 1) / 2; R19'|TJ
int y = (rect.Height() - cyIcon + 1) / 2; qJ\X~5{
// Draw the icon Z7`5x
dc.DrawIcon(x, y, m_hIcon); 8pXfT%]
} mBw2
else 1zdYBb6;j
{ \1=T
sU&^
CDialog::OnPaint(); rER~P\-
} f2uZK!:m
} UqD5
A~w
fdd~e52f
HCURSOR CCaptureDlg::OnQueryDragIcon() PLO\L W
{ "F&Tnhh4
return (HCURSOR) m_hIcon; LTg?5GwD\j
} \ua9thOG
kFS0i%Sr
void CCaptureDlg::OnCancel() j FgZ}Xp
{ +ckMT3
if(bTray) 08`f7[JQo]
DeleteIcon(); ?+3R^%`V
CDialog::OnCancel(); \U==f&G?J
} =ft9T&ciD
\V._Z>]
void CCaptureDlg::OnAbout() R|/Wz/$1A
{ #uQrJh1o8
CAboutDlg dlg; UP\8w#~
dlg.DoModal(); {\P?/U6~f
} q A.+U:I8
|c<XSX?ir
void CCaptureDlg::OnBrowse() )$MS
0[?
{ Jm?l59bv
v
CString str; i:g{{Uuv
BROWSEINFO bi; OlIT|bzkb
char name[MAX_PATH]; .=?Sz*3
ZeroMemory(&bi,sizeof(BROWSEINFO)); @8|~+y8,
bi.hwndOwner=GetSafeHwnd(); D[V`^CTu
bi.pszDisplayName=name; H(MB5
bi.lpszTitle="Select folder"; #X4LLS]VV
bi.ulFlags=BIF_RETURNONLYFSDIRS; a a4$'8s
LPITEMIDLIST idl=SHBrowseForFolder(&bi); !&Z*yH
if(idl==NULL) uRP
Ff77
return; O\%j56Bf
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); X
d!Cp
str.ReleaseBuffer(); Gj6<s./
m_Path=str; Lt>?y&CcQ
if(str.GetAt(str.GetLength()-1)!='\\') "K8nxnq
m_Path+="\\"; 3 Q@9S
UpdateData(FALSE); n1_ %Td
} wyp{KIV
STv(kQs
void CCaptureDlg::SaveBmp() \{kHSV%z
{ EH(tUwY%{
CDC dc; FSv1X
dc.CreateDC("DISPLAY",NULL,NULL,NULL); cS4xe(n8
CBitmap bm; aWdUuid
int Width=GetSystemMetrics(SM_CXSCREEN); nZe\5`
int Height=GetSystemMetrics(SM_CYSCREEN); AmZuo_
bm.CreateCompatibleBitmap(&dc,Width,Height); bG52s
CDC tdc; ~Hs=z$
tdc.CreateCompatibleDC(&dc); cnbo+U
CBitmap*pOld=tdc.SelectObject(&bm); HTw#U2A;+
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `Rrr>vj
tdc.SelectObject(pOld); 0"hiCGm'
BITMAP btm; Ec+22X
bm.GetBitmap(&btm); ?.8<-
DWORD size=btm.bmWidthBytes*btm.bmHeight; DQcWq'yY^
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 0(\p<qq
BITMAPINFOHEADER bih; .hxin[Y
bih.biBitCount=btm.bmBitsPixel; q{/*n]K
bih.biClrImportant=0; X+@s]
bih.biClrUsed=0; =<Hy"4+?.
bih.biCompression=0; ZHz^S)o\[s
bih.biHeight=btm.bmHeight; B.El a
bih.biPlanes=1; FZeP<Ban
bih.biSize=sizeof(BITMAPINFOHEADER); U8E0~[y'
bih.biSizeImage=size; %z=`JhE"Q
bih.biWidth=btm.bmWidth; jn~!V!++
bih.biXPelsPerMeter=0; %t q&
bih.biYPelsPerMeter=0; Kf|0*c
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); P7'M],!9w
static int filecount=0; '\@WN]
CString name; hUBF/4s\
name.Format("pict%04d.bmp",filecount++); _'&k#Q
name=m_Path+name; STw oYn
BITMAPFILEHEADER bfh; 3zbXAR*
bfh.bfReserved1=bfh.bfReserved2=0; tO7I&LNE
bfh.bfType=((WORD)('M'<< 8)|'B'); $-Cy
bfh.bfSize=54+size; 6I"C~&dt
bfh.bfOffBits=54; a"k'm}hVY$
CFile bf; -gB{:UYi3
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ >n(F4C-pl
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); HXyFj
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); vpi l$Uq
bf.WriteHuge(lpData,size); ZH!;z-R
bf.Close(); ("b*? : B
nCount++; Gj)uyjct
} `6UtxJSx
GlobalFreePtr(lpData); [Q|M/|mnR1
if(nCount==1) _Cj(fFL
m_Number.Format("%d picture captured.",nCount); \d:h$
else / xs9.w8-
m_Number.Format("%d pictures captured.",nCount); ERp{gB2U?
UpdateData(FALSE); RU7!U mf
} 2?*||c==*
1b8c67j[
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) fwy"w
{ \<=IMa0
if(pMsg -> message == WM_KEYDOWN) ]r!QmWw~V
{ Et.j1M|g
if(pMsg -> wParam == VK_ESCAPE)
] ;&"1A
return TRUE; z$66\/V']
if(pMsg -> wParam == VK_RETURN) I'?6~Sn3
return TRUE; 22|"K**3J|
} XO%~6Us^
return CDialog::PreTranslateMessage(pMsg); O<>#>[
} 9N^+IZ@l
i_NJ -K
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V!W1fb7V
{ puA|NT
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ cFDxjX?~
SaveBmp(); 8!;$qVt
return FALSE; |UYED%dC
} %2}C'MqS
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ bb}?h]a
CMenu pop; IqNpLh|[
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); rpSr^slr
CMenu*pMenu=pop.GetSubMenu(0); (uRZxX
pMenu->SetDefaultItem(ID_EXITICON); "Tv:*L5
CPoint pt; `[OXVs,7"
GetCursorPos(&pt); /z#F,NB
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); -<PC"B
if(id==ID_EXITICON) &kiF/F 1
DeleteIcon(); >K5~:mx#3
else if(id==ID_EXIT) w2C&%Xk
OnCancel(); Y+@g~TE
return FALSE; _;7fraqX
} |_, /u_
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0 7\02f
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =q5@,wN^
AddIcon(); G0pBR]_5z$
return res; x~z_,':
} -p]>Be+^x
/'\;8A$J`
void CCaptureDlg::AddIcon() %Ci^*zb
{ yjFe'
NOTIFYICONDATA data; WcU@~05b
data.cbSize=sizeof(NOTIFYICONDATA); QkL@JF]Re
CString tip; @iRO7 6m
tip.LoadString(IDS_ICONTIP); HitAc8
data.hIcon=GetIcon(0); ~$Y|ca
data.hWnd=GetSafeHwnd(); GkciA{
strcpy(data.szTip,tip); +aj^Cs1$
data.uCallbackMessage=IDM_SHELL; i5VG2S
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; nEyIt&>9
data.uID=98; SY|Ez!tU:N
Shell_NotifyIcon(NIM_ADD,&data); uOre,AQR
ShowWindow(SW_HIDE); ikIzhUWE
bTray=TRUE; /BT1oWi1y
} =U
c$D*
<wa(xDBw
void CCaptureDlg::DeleteIcon() `36N
n+A
{ k2.G%]j
NOTIFYICONDATA data; {@45?L('
data.cbSize=sizeof(NOTIFYICONDATA); =zOeb/
data.hWnd=GetSafeHwnd(); JjQVzkE
data.uID=98; xDUaHE1co
Shell_NotifyIcon(NIM_DELETE,&data); P5Dk63z]
ShowWindow(SW_SHOW); \lW_f{X)
SetForegroundWindow(); 7`dY 1.rq
ShowWindow(SW_SHOWNORMAL); !UcOl0"6
bTray=FALSE; Zih ?Bm
} ,VWGq@o%
#%8 w
void CCaptureDlg::OnChange() g|4w8ry
{ nP;;MX:B
RegisterHotkey(); !k-` eJ|
} 5VKcV&D
A0>x9 XSkJ
BOOL CCaptureDlg::RegisterHotkey() > H~6NBd5D
{ q]XHa ,"
UpdateData(); fhr-Y'
UCHAR mask=0; 0bSz4<}
UCHAR key=0; : u-.T.zZl
if(m_bControl) )
$#(ZL^m
mask|=4; N Bz%(?\
if(m_bAlt) GI_DhU]~)
mask|=2; !oGQ8 e
if(m_bShift) ?+\E3}:
mask|=1; ($SLb6
key=Key_Table[m_Key.GetCurSel()]; 7E~4)k0<
if(bRegistered){ ?:/|d\,7@
DeleteHotkey(GetSafeHwnd(),cKey,cMask); <m]wi7
bRegistered=FALSE; n_9x"m$
} F@EJtwLd5y
cMask=mask; >A=\8`T^
cKey=key; (bvoF5%
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); nB&j
return bRegistered; R04J3D|
} > 0T
Za
SX_4=^
四、小结 H(&Z:{L
t!t=|JNf{
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。