CreateProcess()因访问冲突而失败

时间:2012-07-05 06:54:05

标签: c winapi createprocess

我的目标是在程序中执行外部可执行文件。首先,我使用了system()函数,但我不希望向用户看到控制台。所以,我搜索了一下,找到了CreateProcess()函数。但是,当我尝试将参数传递给它时,我不知道为什么,它失败了。我从MSDN中获取了这段代码,并稍作改动:

#include <windows.h>
#include <stdio.h>
#include <tchar.h>

void _tmain( int argc, TCHAR *argv[] )
{
    STARTUPINFO si;
    PROCESS_INFORMATION pi;

    ZeroMemory( &si, sizeof(si) );
    si.cb = sizeof(si);
    ZeroMemory( &pi, sizeof(pi) );
    /*
    if( argc != 2 )
    {
        printf("Usage: %s [cmdline]\n", argv[0]);
        return;
    }
    */
    // Start the child process. 
    if( !CreateProcess( NULL,   // No module name (use command line)
        L"c:\\users\\e\\desktop\\mspaint.exe",        // Command line
        NULL,           // Process handle not inheritable
        NULL,           // Thread handle not inheritable
        FALSE,          // Set handle inheritance to FALSE
        0,              // No creation flags
        NULL,           // Use parent's environment block
        NULL,           // Use parent's starting directory 
        &si,            // Pointer to STARTUPINFO structure
        &pi )           // Pointer to PROCESS_INFORMATION structure
    ) 
    {
        printf( "CreateProcess failed (%d).\n", GetLastError() );
        return;
    }

    // Wait until child process exits.
    WaitForSingleObject( pi.hProcess, INFINITE );

    // Close process and thread handles. 
    CloseHandle( pi.hProcess );
    CloseHandle( pi.hThread );
}

然而,这个代码以某种方式破坏了访问冲突。我可以在不向用户显示控制台的情况下执行mspaint吗?

非常感谢你。

3 个答案:

答案 0 :(得分:20)

第二个参数是LPTSTR,即指向非const char数组的指针。 docs具体说:

  

此参数不能是指向只读内存的指针(例如   const变量或文字字符串)

传递字符串文字的原因是一个问题:

  

系统在命令行中添加一个终止空字符   用于将文件名与参数分开的字符串。这划分了   将原始字符串分成两个字符串进行内部处理。

这意味着在您的情况下,它会尝试修改只读内存,从而导致崩溃。

答案 1 :(得分:8)

试试这个,它应该有效。

TCHAR lpszClientPath[500]= TEXT("c:\\users\\e\\desktop\\mspaint.exe");
if(!CreateProcess(NULL, lpszClientPath, NULL, NULL, FALSE,  NORMAL_PRIORITY_CLASS|CREATE_NEW_CONSOLE|CREATE_UNICODE_ENVIRONMENT,NULL, NULL, &si, &pi))
            {
    printf( "CreateProcess failed (%d).\n", GetLastError() );
        return;
            }
...
...

答案 2 :(得分:-1)

将您的代码更改为:

#include <windows.h>
#include <stdio.h>
#include <tchar.h>

void _tmain( int argc, TCHAR *argv[] )
{
    TCHAR ProcessName[256];
    STARTUPINFO si;
    PROCESS_INFORMATION pi;

    wcscpy(ProcessName,L"c:\\users\\e\\desktop\\mspaint.exe");
    ZeroMemory( &si, sizeof(si) );
    si.cb = sizeof(si);
    ZeroMemory( &pi, sizeof(pi) );
    /*
    if( argc != 2 )
    {
        printf("Usage: %s [cmdline]\n", argv[0]);
        return;
    }
    */
    // Start the child process. 
    if( !CreateProcess( NULL,   // No module name (use command line)
        ProcessName,        // Command line
        NULL,           // Process handle not inheritable
        NULL,           // Thread handle not inheritable
        FALSE,          // Set handle inheritance to FALSE
        0,              // No creation flags
        NULL,           // Use parent's environment block
        NULL,           // Use parent's starting directory 
        &si,            // Pointer to STARTUPINFO structure
        &pi )           // Pointer to PROCESS_INFORMATION structure
    ) 
    {
        printf( "CreateProcess failed (%d).\n", GetLastError() );
        return;
    }

    // Wait until child process exits.
    WaitForSingleObject( pi.hProcess, INFINITE );

    // Close process and thread handles. 
    CloseHandle( pi.hProcess );
    CloseHandle( pi.hThread );
}