GetConsoleDisplayMode函数的问题求释疑

KaKaKaKa 2012-05-15 12:02:54

很短，直接上代码：



#include <windows.h> 

#include <stdio.h> 

typedef BOOL (WINAPI *PROCGETCONSOLEDISPLAYMODE)(LPDWORD); 

typedef BOOL (WINAPI *PROCSETCONSOLEDISPLAYMODE)(HANDLE,DWORD,PCOORD); 



PROCGETCONSOLEDISPLAYMODE GetConsoleDisplayMode; 

PROCSETCONSOLEDISPLAYMODE SetConsoleDisplayMode; 







int main() 

{ 

	COORD coord = {0};

    DWORD dwOldMode= -1; 

	DWORD dwNewMode= -1; 

    HMODULE hKernel32 = GetModuleHandle("kernel32"); 

    if (!hKernel32) 

       return 0; 

    GetConsoleDisplayMode = (PROCGETCONSOLEDISPLAYMODE) 

    GetProcAddress(hKernel32,"GetConsoleDisplayMode"); 

    if (!GetConsoleDisplayMode) 

       return 0; 

    SetConsoleDisplayMode = (PROCSETCONSOLEDISPLAYMODE) 

    GetProcAddress(hKernel32,"SetConsoleDisplayMode"); 



    if (!SetConsoleDisplayMode) 

       return 0; 

    HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);

	

	dwNewMode = 1;

    SetConsoleDisplayMode(hOut,dwNewMode,&coord); 

    GetConsoleDisplayMode(&dwOldMode); //为什么old会是3?

    printf("OldMode:%d NewMode:%d\n",dwOldMode,dwNewMode); 



	Sleep(2000);



	dwNewMode = 0;

    SetConsoleDisplayMode(hOut,dwNewMode,&coord); 

    GetConsoleDisplayMode(&dwOldMode); //为什么old会是0?

    printf("OldMode:%d NewMode:%d\n",dwOldMode,dwNewMode); 



    getchar() ;

    return 0;

}

...全文

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KaKaKaKa 2012-05-15

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程序功能是先是控制台全屏，Sleep两秒后，恢复普通屏
功能是没问题
但是发现GetConsoleDisplayMode这个函数out参数返回的值很奇怪
请求帮助

KaKaKaKa 2012-05-15

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我这样理解的：

设置全屏后，系统会将CONSOLE_FULLSCREEN(即1)先给dwOldMode，但不能保证过度到全屏能成功
等到过度完成成功后，系统再将CONSOLE_FULLSCREEN_HARDWARE(即2)按位或运算到dwOldMode上
所以dwOldMode最终结果是CONSOLE_FULLSCREEN | CONSOLE_FULLSCREEN_HARDWARE(即3 = 1|2)

应该对的哦？ :）

W170532934 2012-05-15

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因为你把GetConsoleDisplayMode函数放置在了设置的后面，肯定获得到了你刚才设置的那个模式了。

赵4老师 2012-05-15

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可兼或

赵4老师 2012-05-15

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3==2|1

KaKaKaKa 2012-05-15

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各位可以将程序贴到VC6里编译运行

在VC2005以上要将定义的函数指针类型、函数指针声明以及从Kernel32模块获取函数地址那段去掉
然后编译运行看看
Set那个函数没问题 dwNewMode无疑惑是正确的

问题是Get那个函数
函数返回是TRUE
dwOldMode 出现3 很奇怪

KaKaKaKa 2012-05-15

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我用的是VC6 因为VC6 SDK的wincon.h里没有CONSOLE_FULLSCREEN_MODE等宏的定义

我在VC2010上都不需要使用函数指针就能使用API函数GetConsoleDisplayMode了

不过不管VC6还是VC2010
对GetConsoleDisplayMode而言返回值是TRUE 获得的mode只可能0或者1啊
我记得CONSOLE_FULLSCREEN_MODE是0，另一个是CONSOLE_WINDOW_MODE是1
wincon.h里只有这俩宏呀
可是，我这里怎么会获得的是3呢？？？

赵4老师 2012-05-15

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查MSDN是Windows程序员必须掌握的技能之一。
ms-help://MS.VSCC.v90/MS.MSDNQTR.v90.chs/dllproc/base/getconsoledisplaymode.htm

GetConsoleDisplayMode Function

Retrieves the display mode of the current console.

BOOL WINAPI GetConsoleDisplayMode(
__out LPDWORD lpModeFlags
);

Parameters
lpModeFlags
The display mode of the console. This parameter can be one or more of the following values.

Value Meaning
CONSOLE_FULLSCREEN
1
Full-screen console. The console is in this mode as soon as the window is maximized. At this point, the transition to full-screen mode can still fail.

CONSOLE_FULLSCREEN_HARDWARE
2
Full-screen console communicating directly with the video hardware. This mode is set after the console is in CONSOLE_FULLSCREEN mode to indicate that the transition to full-screen mode has completed.

Return Value
If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks
To compile an application that uses this function, define _WIN32_WINNT as 0x0500 or later. For more information, see Using the Windows Headers.

Requirements
Client
Requires Windows Vista or Windows XP.

Server
Requires Windows Server 2008 or Windows Server 2003.

Header
Declared in Wincon.h; include Windows.h.
Library
Use Kernel32.lib.

DLL
Requires Kernel32.dll.

See Also
Console Functions
Console Modes
SetConsoleDisplayMode

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Build date: 8/15/2007

CandPointer 2012-05-15

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[Quote=引用 8 楼的回复:]

Definition at line 387 of file wincon.h.
[/Quote]

简洁有效的答案。

直接告诉LZ第几行

赵4老师 2012-05-15

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File: "C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\WinCon.h" 2 occurrences found on 2 lines
802: #define CONSOLE_FULLSCREEN 1 // fullscreen console
803: #define CONSOLE_FULLSCREEN_HARDWARE 2 // console owns the hardware

赵4老师 2012-05-15